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  Subjects -> CHEMISTRY (Total: 871 journals)
    - ANALYTICAL CHEMISTRY (54 journals)
    - CHEMISTRY (610 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (42 journals)
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    - PHYSICAL CHEMISTRY (70 journals)

CHEMISTRY (610 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 13)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 42)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 20)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 20)
ACS Macro Letters     Full-text available via subscription   (Followers: 25)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 40)
ACS Nano     Full-text available via subscription   (Followers: 267)
ACS Photonics     Full-text available via subscription   (Followers: 13)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 23)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chimica Slovenica     Open Access  
Acta Chromatographica     Full-text available via subscription   (Followers: 8)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 54)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 65)
Advances in Chemical Science     Open Access   (Followers: 16)
Advances in Chemistry     Open Access   (Followers: 20)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19)
Advances in Drug Research     Full-text available via subscription   (Followers: 21)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 25)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 3)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 61)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 15)
American Journal of Chemistry     Open Access   (Followers: 29)
American Journal of Plant Physiology     Open Access   (Followers: 11)
American Mineralogist     Hybrid Journal   (Followers: 15)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 166)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 238)
Annales UMCS, Chemia     Open Access  
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 5)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 8)
Applied Spectroscopy     Full-text available via subscription   (Followers: 22)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 5)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 339)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 20)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 121)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 84)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 2)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 71)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 9)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 18)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 73)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 22)
Chemical Reviews     Full-text available via subscription   (Followers: 183)
Chemical Science     Open Access   (Followers: 23)
Chemical Technology     Open Access   (Followers: 22)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 7)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 32)
Chemistry & Industry     Hybrid Journal   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 153)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
Chemistry and Materials Research     Open Access   (Followers: 20)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 248)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 19)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 11)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 11)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 6)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 5)
Combustion Science and Technology     Hybrid Journal   (Followers: 22)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 11)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 3)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 6)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal  
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 14)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 70)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  

        1 2 3 4 | Last

Journal Cover Arabian Journal of Chemistry
  [SJR: 0.512]   [H-I: 20]   [5 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1878-5352
   Published by Elsevier Homepage  [3175 journals]
  • The electrochemical synthesis and corrosion behaviour of
           TiO2/poly(indole-co-aniline) multilayer coating: Experimental and
           theoretical approach

    • Authors: Serap Toprak Döşlü; Başak Doğru Mert; Birgül Yazıcı
      Pages: 1 - 13
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Serap Toprak Döşlü, Başak Doğru Mert, Birgül Yazıcı
      The aim of this study was to protect stainless steel against corrosion via poly (indole-co-aniline) with the help of titanium dioxide pre-coating. Different monomer ratios (1:1 and 1:9) were applied in order to determine the suitable chain composition to synthesize the copolymer in lithium perchlorate containing acetonitrile. The structures, morphologies, electrochemical properties and corrosion resistances of the mono and multi-layer coatings were investigated by Fourier-transform infrared spectra, scanning electron microscope, energy dispersive X-ray spectrometer, electrochemical impedance spectroscopy and anodic polarization. Furthermore the geometric structure and electronic properties of indole, aniline, and indole-co-aniline (dimmer) molecules have been investigated by quantum calculations. The results indicated that corrosion protection of copolymers was increased via titanium dioxide pre-coating. The 1:1 copolymer coating showed better corrosion prevention than 1:9 coating. The correlation was determined between experimental and theoretical parameters.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.03.007
       
  • Seasonal dynamics of constitutive levels of phenolic components lead to
           alterations of antioxidant capacities in Acer truncatum leaves

    • Authors: Lingguang Yang; Peipei Yin; Ke Li; Hang Fan; Qiang Xue; Xiang Li; Liwei Sun; Yujun Liu
      Pages: 14 - 25
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Lingguang Yang, Peipei Yin, Ke Li, Hang Fan, Qiang Xue, Xiang Li, Liwei Sun, Yujun Liu
      Acer truncatum leaves (ATL) have long been used in China as a substitutional tea with health benefits. However, little is known about the antioxidant capacities as well as its bioactive components. The present study was to investigate constitutive phenolic compositions and evaluate antioxidant activities of ATL through its whole growing season. The results showed that all seasonal ATL samples contained remarkable phenols, tannins and flavonoids, and exhibited high antioxidant capacities. Constitutive levels of total phenols, tannins and flavonoids, and three individual phenolic compounds, namely 1,2,3,4,6-penta-O-galloyl-β-d-glucose (PGG), methyl gallate (MG), and quercetin-3-O-l-rhamnoside (QR), and DPPH and ABTS + scavenging capacities were all significantly higher in both the beginning (S4) and ending (S11) months than those in the middle months (S5–S10), resulting in a consistent seasonal saddle-shaped pattern. Since S4 and S11 showed significant differences in oxygen radical absorbance capacity (ORAC) values but not in total flavonoids, and there was no significant correlation between ORAC and total flavonoids, it can be inferred that total flavonoids contributed less to the ORAC values than total phenols and tannins did. Correlation analyses further revealed that total phenols, tannins and flavonoids were the main contributors to antioxidant ability, and PGG, MG and QR were found to be the key components of phenols (including tannins and flavonoids) in ATL. Gallic acid was first discovered in ATL, and high levels of PGG and QR (both higher than 1g/100g d.w. in April) were corroborated through HPLC analysis. Impressive antioxidant abilities of S4 and S11 were further demonstrated by cellular antioxidant assay, and flavonoids showed stronger antioxidant capacity in the cellular level than other phenolic compositions. In conclusion, seasonal dynamics of constitutive levels of phenolic components lead to alterations of antioxidant capacities in ATL, and November and April were the ideal harvesting time with highest levels of phenols and antioxidant capacity.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.01.009
       
  • Synthesis of highly stable MOF-5@MWCNTs nanocomposite with improved
           hydrophobic properties

    • Authors: Ata-ur-Rehman; Syed Ahmad Tirmizi; Amin Badshah; Hafiz Muhammad Ammad; Muhammad Jawad; Syed Mustansar Abbas; Usman Ali Rana; Salah Ud-Din Khan
      Pages: 26 - 33
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Ata-ur-Rehman, Syed Ahmad Tirmizi, Amin Badshah, Hafiz Muhammad Ammad, Muhammad Jawad, Syed Mustansar Abbas, Usman Ali Rana, Salah Ud-Din Khan
      Metal-organic frameworks (MOFs) are a promising class of nanoporous crystalline materials with potential applications in gas storage, catalysis, biomedical and clean energy. However, moisture adsorption dampens their structure and therefore capacity and selectivity. Improving the hydrostability of MOF-5 without compromising on its characteristic features can be a potential way to make the best use of this material. In this work, we used a solvothermal method to precipitate MOF-5 in well-dispersed carboxy derived MWCNTs. By inspiring from the hydrophobic properties of carbon nanotubes (CNTs), we have successfully utilized a solvothermal approach to precipitate MOF-5 in well-dispersed carboxy functionalized multiwalled carbon nanotubes (FMWCNTs) to produce a MOF-5@FMWCNTs nanocomposite. The experimental results in this study reveal that the FMWCNTs form stable nanocomposite with MOF-5 particles and the resultant hybrid MOF-5@FMWCNTs nanocomposite indicated an increase in the moisture stability and even after prolonged exposure to ambient moist environment (55% humidity at 28°C) showed less degradation as confirmed by the BET surface area, and powder XRD studies. So, our findings demonstrate a simple synthetic route to make use of FMWCNTs to stabilize the MOF-5 and it can be a choice for many other MOFs without much compromise on the surface area.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.01.012
       
  • Photocatalytic degradation of 1,2-dichlorobenzene using immobilized
           TiO2/SnO2/WO3 photocatalyst under visible light: Application of response
           surface methodology

    • Authors: Renugambaal Nadarajan; Wan Azelee Wan Abu Bakar; Rusmidah Ali; Razali Ismail
      Pages: 34 - 47
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Renugambaal Nadarajan, Wan Azelee Wan Abu Bakar, Rusmidah Ali, Razali Ismail
      Photodegradation of 1,2-dichlorobenzene over illuminated trimetallic oxide consisting of rutile TiO2 in major portion together with WO3 and SnO2 was studied with respect to the effect of physicochemical properties of the catalyst. The photocatalytic activity enhancement by the presence of surface defects due to calcination temperature was investigated with the information obtained from XRD, DRUV, PL, FESEM and XPS. Calcination of TiO2 at 950°C resulted in highest activity. Decrease in percentage of degradation of 1,2-dichlorobenzene was noted when it was immobilized on PVC film and chitosan beads. The effect of calcination temperature, catalyst loading and pH was investigated for slurry and after immobilization. Further optimization study was carried out with the aid of response surface methodology utilizing Box–Behnken design. High correlation was obtained for the experimental and the predicted value (R 2 =0.9992, Adj. R 2 =0.9982 and Pred. R 2 =0.9971). Optimization result showed that the maximum percentage of degradation was achieved at calcination temperature of 961.2°C, with catalyst loading of 0.22g and pH 7.2. The presence of two intermediates was identified during the reaction using GC–MS. On top of that the photocatalyst could also be reused for several times.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2016.03.006
       
  • Nanobiotechnology approach using plant rooting hormone synthesized silver
           nanoparticle as “nanobullets” for the dynamic applications in
           horticulture – An in vitro and ex vitro study

    • Authors: Raja Muthuramalingam Thangavelu; Dharanivasan Gunasekaran; Michael Immanuel Jesse; Mohammed Riyaz S.U; Deepan Sundarajan; Kathiravan Krishnan
      Pages: 48 - 61
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Raja Muthuramalingam Thangavelu, Dharanivasan Gunasekaran, Michael Immanuel Jesse, Mohammed Riyaz S.U, Deepan Sundarajan, Kathiravan Krishnan
      Horticulture is the branch of agriculture that deals with science and technology and business of plant cultivation and it is considered to be the foremost part of the world economy. Even though, one of the major challenges which has seriously influenced the economic loss of horticulture is rooting of cuttings and root growth inhibiting plant pathogens. To address this issue through nanobiotechnology, we ingeniously build a concept of silver nanoparticles (AgNPs) as “nano-bullets” can act for a dual mode like root enhancer and pathogen destroyer on the target site. After that, we succeeded in AgNPs synthesis, using two auxin rooting hormones of Indole-3-acetic acid and Indole-3-butyric acid as a reducing cum stabilizing agent. Further, its efficacy of root promoting and pathogen inhibitory action was sufficiently validated through in vitro and ex vitro studies with model plants and plant pathogens. As a result, the action duality of hormone-stabilized AgNPs was manifested to threefold enhanced root growth compared to controls and it increased the rooting capabilities against root growth inhibiting phytopathogens. This feature was also proved by the direct antifungal assay. Moreover, hormone-AgNPs left no toxicity to treated plants which was revealed by RAPD molecular markers. Therefore, with a detailed study and analysis with instruments such as Spectroscopy, TEM, Zetasizer, FTIR, Cyclic Voltammetry, Fluorescence microscopy (nanoparticles uptake), SEM coupled with EDS (bioaccumulation), TGA (grafting density) and PCR (RAPD analysis), this study can unravel the relevance, scope and current challenges at horticulture plants root development and plant disease management for the sustainable agricultural crop production.
      Graphical abstract image

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2016.09.022
       
  • Characterization of phenolic constituents and evaluation of antioxidant
           properties of leaves and stems of Eriocephalus africanus

    • Authors: Marcelo D. Catarino; Artur M.S. Silva; Susana C. Saraiva; Abilio J.F.N. Sobral; Susana M. Cardoso
      Pages: 62 - 69
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Marcelo D. Catarino, Artur M.S. Silva, Susana C. Saraiva, Abilio J.F.N. Sobral, Susana M. Cardoso
      Eriocephalus africanus, an Asteraceae plant endemic from South Africa and naturalized in the Mediterranean region, is commonly used in culinary and in traditional medicine. Despite the claimed health benefits attributed to this plant by the folk medicine, there is still a lack of scientific data to support this information. The present study describes the main phenolic composition of hydroethanolic extracts from stems and leaves of E. africanus, along with the assessment of their antioxidant properties. The identification of the phenolic constituents on the stems and leaves from E. africanus was carried out by LC-DAD-ESI/MS n , and the structures of the two major HPLC-eluted compounds were further confirmed by NMR analysis. Both extracts were rich in mono- and di-caffeoylquinic acids, which accounted for approximately 90% and 74% of total quantified phenolics, for the stems and leaves extracts, respectively. Besides, eriodictyol-hexuronide was found in considerable amounts in the extract from the leaves. One must highlight that these compounds together with other minor phenolic acids (namely other caffeoyl, ferulic and protocatechuic acid derivatives) and flavonoids (including hesperetin and eriodictyol) were herein identified for the first time. Furthermore, through three in vitro methods, namely 2,2-diphenyl-1-picrylhydrazyl (DPPH ) radical scavenging, ferric reducing antioxidant power and lipid peroxidation inhibition capacity assays, the antioxidant capacity of the extracts was measured, revealing promising properties. Overall, these results are an important contribution for the elucidation of the phenolic composition of E. africanus, as well as for the understanding of the biological properties of this medicinal plant species.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2015.04.018
       
  • Salicornia ramosissima: Secondary metabolites and protective effect
           against acute testicular toxicity

    • Authors: Daniela Ferreira; Vera M.S. Isca; Pedro Leal; Ana M.L. Seca; Helena Silva; Maria de Lourdes Pereira; Artur M.S. Silva; Diana C.G.A. Pinto
      Pages: 70 - 80
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Daniela Ferreira, Vera M.S. Isca, Pedro Leal, Ana M.L. Seca, Helena Silva, Maria de Lourdes Pereira, Artur M.S. Silva, Diana C.G.A. Pinto
      Salicornia ramosissima J. Woods is a salt tolerant plant currently used in the human diet, whose genus not only displays great potential as a crop plant in deserts and highly saline soils, but also has value in traditional medicine and exhibits promising biological activities. The present study was designed to evaluate the effect of S. ramosissima ethanolic extract on carbon tetrachloride (CCl4)-induced testicular damage in a mouse model and identify secondary metabolites present in the tested extract. The histopathological analysis showed that the treatment with the ethanolic extract prior to CCl4 administration prevented significantly the architectural disorder of seminiferous epithelium and germ cell exfoliation. The phytochemical study allowed the identification of known phenolic and aliphatic compounds [ethyl linolenoate (1), sitostanol (2), octadecyl (3) and eicosanyl (4) (E)-ferulates, ethyl (E)-2-hydroxycinnamate (5), scopoletin (6), a triacylglycerol of tetracosanoic acid (7)], and three new compounds: saliramoester, a long chain triester (8), saliramophenone, a propiophenone derivative (9) and saliramopyrrole a pyrrole-3-carbaldehyde derivative (10). Their chemical structures were elucidated using detailed spectroscopic studies (1D and 2D NMR and MS). These results enhance the value of S. ramosissima as an excellent source of structurally interesting phytochemicals and as protective agent against testicular toxicity.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2016.04.012
       
  • The potential use of HNO3-treated clinoptilolite in the preparation of
           Pt/CeO2-Clinoptilolite nanostructured catalyst used in toluene abatement
           from waste gas stream at low temperature

    • Authors: Majid Amereh; Mohammad Haghighi; Pooya Estifaee
      Pages: 81 - 90
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Majid Amereh, Mohammad Haghighi, Pooya Estifaee
      In this paper, CeO2(30%)/Clinoptilolite was synthesized via HNO3 treatment and co-precipitation methods and then 1%Pt was dispersed over support by ultrasound assisted wet impregnation. The synthesized samples were characterized using XRF, XRD, FESEM, N2 adsorption and FTIR techniques. The obtained results from XRD revealed the main phase in utilized clay is clinoptilolite and also formation of amorphous structure was proved after acid treatment. FESEM micrographs confirmed significant structural changes in clinoptilolite after acid treatment and also formation of ceria nanoparticles. N2 adsorption presented large enough surface area for Pt/CeO2-Clinoptilolite nanostructured catalyst to be used for toluene oxidation. Finally, activity results indicated that synthesized nanostructured catalyst was highly active and stable and could eliminate more than 90% of toluene at 130°C. Utilizing inexpensive materials in synthesis and assisting ultrasound in dispersion of active phase have made Pt(1%)/CeO2(30%)-Clinoptilolite a nominee to be used for catalytic oxidation of toluene.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2015.02.003
       
  • Environment-friendly green chemistry approaches for an efficient synthesis
           of 1-amidoalkyl-2-naphthols catalyzed by tannic acid

    • Authors: Rajesh K. Singh; Robita Duvedi
      Pages: 91 - 98
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Rajesh K. Singh, Robita Duvedi
      A new, facile, cost-effective and environment-friendly protocol is reported for the synthesis of 1-amidoalkyl-2-naphthols exploring tannic acid as a novel, cheap and biodegradable catalyst. β-naphthol is condensed with substituted aromatic aldehydes and various amides using catalytic amount of tannic acid in the absence of solvent under thermal (hot plate and oil bath) and microwave irradiation techniques. This green protocol offers many advantages such as short reaction time, use of environment-friendly and cheap catalyst and good to excellent yields.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2014.08.022
       
  • Removal of Pb(II) from aqueous solutions by Phytolacca americana L.
           biomass as a low cost biosorbent

    • Authors: Guiyin Wang; Shirong Zhang; Ping Yao; Yue Chen; Xiaoxun Xu; Ting Li; Guoshu Gong
      Pages: 99 - 110
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Guiyin Wang, Shirong Zhang, Ping Yao, Yue Chen, Xiaoxun Xu, Ting Li, Guoshu Gong
      Screening a new biosorbent with low cost and high efficiency from a native plant material is a key to the adsorption of heavy metal ions from wastewater. In this study, the potential of Phytolacca americana L. as a biosorbent for Pb(II) removal from aqueous solutions was investigated. Experiments were performed to evaluate the effect of biosorbent dosage, pH, initial Pb(II) concentration and contact time on the Pb(II) removal. The results indicated that the hydroxyl, carboxyl and amine groups may take part in Pb(II) binding. HNO3-modified P. americana (HPAL) showed a significant higher uptake capacity compared to original P. americana (PAL) (p <0.05). A dose of 20gL−1 of biosorbents in solutions with an initial pH of 6.0, an initial Pb(II) concentration of 30mgL−1 and a contact time of 120min resulted in the maximum Pb(II) removal efficiency. The Freundlich isotherm gave a better fit than the Langmuir isotherm revealed that the biosorption was potentially multilayer. Further, the adsorption kinetics followed a pseudo second-order model, which implied that the biosorption was mainly a chemisorption process. The thermodynamic properties showed that the Pb(II) adsorption onto the P. americana biomass was feasible, spontaneous and exothermic in nature. Both physisorption and chemisorption were involved in the biosorption of Pb(II) onto the surface of P. americana biomass through electrostatic interaction and ion exchange. Additionally, desorption studies revealed promising regeneration potential of these biosorbents. The present study showed that P. americana biomass could be used as a low-cost, eco-friendly and effective biosorbent for the Pb(II) removal from wastewater.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2015.06.011
       
  • Synthesis and characterization of high wash fastness novel azo reactive
           dyes incorporating aromatic bridged diamines

    • Authors: Aamer Saeed; Ghulam Shabir
      Pages: 111 - 119
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Aamer Saeed, Ghulam Shabir
      A new series of azo reactive dyes containing free chlorine atoms have been synthesized. The synthetic methodology involves the diazotization of 4′4-diamino diphenylamine-2-sulfonic acid (2) followed by azo coupling with 1-amino-8-naphthol-3,6-disulfonic acid (3) in alkaline medium to yield intermediate dye (4). Condensation of the latter with 1,3,5-trichlorotriazine afforded the cyanurated dye (5). A number of novel bis aromatic diamines (1a–j) were separately synthesized as bridging groups and were coupled with cyanurated dye (5) at room temperature to provide the target dyes designated as S1–S10 containing triazine and linker in a single molecule. The structures of newly synthesized compounds were confirmed by analytical data and spectroscopic techniques. The synthesized dyes were applied on cotton fibers to assess their light fastness, wash fastness and rubbing fastness and were found to possess medium to high fastness values in different dyes.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2014.11.010
       
  • Chitosan/nano ZnO composite films: Enhanced mechanical, antimicrobial and
           dielectric properties

    • Authors: P. Mujeeb Rahman; V.M. Abdul Mujeeb; K. Muraleedharan; Steni K. Thomas
      Pages: 120 - 127
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): P. Mujeeb Rahman, V.M. Abdul Mujeeb, K. Muraleedharan, Steni K. Thomas
      For the first time, unfocused Chitosan nano ZnO composite film was prepared by a simple one pot procedure. The novel composite materials were ably characterized by various physico-chemical methods. Dielectric and conductivity features of composite materials were analysed. The result showed that both dielectric constant and conductivity values were improved when nano ZnO was incorporated. The potential applicability of composite films to perform as an efficient antimicrobial packaging material was evaluated. Antimicrobial analysis showed that all composite films exhibited enhanced antimicrobial efficacy as compared to pure chitosan film and it is linearly related to the amount of ZnO particles in the matrix.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2016.09.008
       
  • Elemental composition of Cyrtanthus obliquus and Lippia javanica used in
           South African herbal tonic, Imbiza

    • Authors: Nomfundo T. Mahlangeni; Roshila Moodley; Sreekanth B. Jonnalagadda
      Pages: 128 - 136
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Nomfundo T. Mahlangeni, Roshila Moodley, Sreekanth B. Jonnalagadda
      Imbiza is a herbal tonic, which has gained popularity amongst South Africans as an immune booster and for the treatment of many minor and chronic illnesses. Main ingredients of Imbiza are extracts from two medicinal plants namely Cyrtanthus obliquus and Lippia javanica. The concentrations of various elements in these two plants are examined. The total and water extractable elemental concentrations were determined in both the plants. The elemental concentrations in the water extracts more closely represent concentrations in the herbal tonic. Concentrations of selected elements in C. obliquus bulbs collected from eight market sites around the KwaZulu-Natal province were investigated. The levels of the elements in decreasing order were Ca>Mg>Fe>Zn>Mn>Cu≈Se>Pb>Cr for total concentrations; and Ca>Mg>Fe>Zn>Mn for water extractable forms. Elemental levels in C. obliquus bulbs were dependent on the source, which suggested the importance of collection sites on elemental levels. A high percentage of Zn (77.5–91.5%) was found in water extracts. The levels of selected elements in L. javanica leaves collected from ten different locations around the KwaZulu-Natal province were also investigated. The levels of the elements were found to be in the decreasing order of Ca>Mg>Fe>Zn>Mn>Cu>Se>Cr>Pb>Co>Cd for total concentrations and Ca>Mg>Fe>Zn>Cu>Cr>Pb for water extractable forms. It was evident from the study that the herbal tonic was a good source of Ca and Mg, thus accredited as a viable immune booster and toxic metals were below the recommended levels in the investigated samples.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2014.07.007
       
  • Novel derivatives of 5,6-dimethoxy-1-indanone coupled with substituted
           pyridine as potential antimicrobial agents

    • Authors: Vimal M. Patel; Nilay D. Bhatt; Pralav V. Bhatt; Hasmukh D. Joshi
      Pages: 137 - 142
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Vimal M. Patel, Nilay D. Bhatt, Pralav V. Bhatt, Hasmukh D. Joshi
      Synthesis of novel derivatives of 5,6-dimethoxy-1-indanone was carried out via its Schiff’s base using 2-cyanoacetohydrazide followed by cyclization with 2-arylidenemalononitrile in the presence of a catalytical amount of piperidine to get 6-amino-1-(5,6-dimethoxy-2,3-dihydro-1H-inden-1-ylideneamino)-2-oxo-4-aryl-1,2-dihydropyridine-3,5-dicarbonitrile derivatives. The structures of the synthesized compounds were confirmed on the basis of their spectral and elemental analysis. The synthesized compounds were also screened for antimicrobial activity and found to have promising antibacterial activity.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2014.07.014
       
  • Synthesis of novel 2,5-disubstituted-1,3,4-selenadiazoles from fatty acid
           hydrazides

    • Authors: Himani Varshney; Aiman Ahmad; Abdul Rauf
      Pages: 143 - 148
      Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1
      Author(s): Himani Varshney, Aiman Ahmad, Abdul Rauf
      A series of novel unsaturated hydroxy and non-hydroxy fatty acid residue substituted 1,3,4-selenadiazoles were described here. These derivatives were synthesized from the reaction of fatty acid hydrazide 1(a–d) with acetyl chloride in the presence of anhydrous sodium carbonate in tetrahydrofuran and water at 0°C, to form N′-acetyl undec-10-enoic hydrazide 2a, N′-acetyl-(9Z)-octadec-9-enoic hydrazide 2b, N′-acetyl-(9Z, 12R)-12-hydroxy-9-enoic hydrazide 2c, and N′-acetyl-(9R, 12Z)-9-hydroxy-12-enoic hydrazide 2d. Then these hydrazines (dicarbonyl compound) on reaction with Woollin’s reagent (WR) in toluene led to the corresponding 2-(dec-9′-enyl)-5-methyl-1,3,4-selenadiazole 3a, 2-[(8′Z)-heptadec-8′-enyl]-5-methyl-1,3,4-selenadiazole 3b, 2-[(8′Z, 11′R)-11′-hydroxy-octadec-8′-enyl)]-5-methyl-1,3,4-selenadiazole 3c, and 2-[(8′R, 11′Z)-8′-hydroxy-octadec-11′-enyl)]-5-methyl-1,3,4-selenadiazole 3d, respectively. These synthesized compounds were characterized on the basis of IR, 1H NMR, 13C NMR, mass spectra and elemental analysis results.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2014.08.002
       
  • Corrigendum to “Direct oxidation of Δ2-isoxazolines synthesis by metal
           ion-mediated diastereoface-selective 1,3-dipolar cycloaddition with
           “activated” DMSO” [Arab. J. Chem. 10(Suppl. 1) (2017) S800–S803]

    • Authors: Naoufel Ben Hamadi; Moncef Msaddek
      Abstract: Publication date: Available online 27 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Naoufel Ben Hamadi, Moncef Msaddek


      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2012.12.008
       
  • Polydopamine-functionalized graphene nanoplatelet smart conducting
           electrode for biosensing applications

    • Authors: Prosper Kanyong; Francis D. Krampa; Yaw Aniweh; Gordon A. Awandare
      Abstract: Publication date: Available online 9 January 2018
      Source:Arabian Journal of Chemistry
      Author(s): Prosper Kanyong, Francis D. Krampa, Yaw Aniweh, Gordon A. Awandare
      The development of novel a polydopamine (PDA)-functionalized graphene nanoplatelets (GNPs)-based disposable electrode is described. The sensor was fabricatedby drop-coating PDA@GNPs in polyethylene glycol (PEG) and poly(3,4-ethylenedioxythiophene (PEDOT):poly(styrenesulfonate) (PSS) aqueous suspension onto the working area of a screen-printed electrode (SPE). The final sensor, designated as PDA@GNPs/PPP/SPE, was characterized by scanning electron microscopy (SEM) and Raman spectroscopy, Faradaic electrochemical impedance spectroscopy (FEIS) and cyclic voltammetry (CV). Mediated detection of hydrogen peroxide (H2O2) via the redox properties of PDA was achieved. It showed excellentselectivityand sensitivity toward H2O2 with a limit of detection and sensitivity of0.55µM(S/N = 3) and 3.0 µA.mM-1.cm-2, respectively. Thereafter, glucose oxidase (GOx) was immobilized onto the electrode to develop GOx/PDA@GNPs/PPP/SPE; the glucose biosensor exhibited a limit of detection of 0.25 μM (S/N = 3) and a sensitivity of 0.51 μA.μM-1.cm-2; thus, proving its potential suitability for biosensing applications.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2018.01.001
       
  • A label-free colorimetric sensor based on silver nanoparticles directed to
           hydrogen peroxide and glucose

    • Authors: Nghia Duc Nguyen; Tuan Van Nguyen; Anh Duc Chu; Hoang Vinh Tran; Luyen Thi Tran; Chinh Dang Huynh
      Abstract: Publication date: Available online 7 January 2018
      Source:Arabian Journal of Chemistry
      Author(s): Nghia Duc Nguyen, Tuan Van Nguyen, Anh Duc Chu, Hoang Vinh Tran, Luyen Thi Tran, Chinh Dang Huynh
      A simple method has been developed for preparation of silver nanoparticles (AgNPs) based on the use of graphene quantum dots (GQDs) as a reducing agent and a stabilizer. The synthesized nanocomposites consisting of silver nanoparticle and graphene quantum dots (AgNPs/GQDs) has been characterized by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Ultraviolet–visible spectroscopy (UV-Vis), Fourier-Transform Infrared spectroscopy (FT-IR), Energy Dispersive X-ray spectroscopy (EDX) and Dynamic Light Scattering (DLS). Results indicate that monodisperse of AgNPs has been obtained with particles size ca. ∼ 40 nm and specific plasmon peak of silver nanoparticles at 425 nm by UV-Vis spectrum. Using AgNPs/GQDs nanocomposite, we have constructed a colorimetric sensor for hydrogen peroxide (H2O2) and glucose sensors based on the use of AgNPs/GQDs as both probes: capture probe and signal probe. The fabricated sensors perform good sensitivity and selectivity with a low detection limit of 162 nM and 30 μM for H2O2 and glucose sensing, respectively. Moreover, the biosensors have been successfully applied to detect glucose concentrations in human urine.
      Graphical abstract image

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.035
       
  • Carboxymethylagarose-based multifunctional hydrogel with super
           stretchable, self-healable having film and fiber forming properties

    • Authors: Jai Prakash Chaudhary; Faisal Kholiya; Nilesh Vadodariya; Vimal M. Budheliya; Azaz Gogda; Ramavatar Meena
      Abstract: Publication date: Available online 5 January 2018
      Source:Arabian Journal of Chemistry
      Author(s): Jai Prakash Chaudhary, Faisal Kholiya, Nilesh Vadodariya, Vimal M. Budheliya, Azaz Gogda, Ramavatar Meena
      In this work, we repot a super stretchable and quick self-healable composite hydrogels with film and fiber forming properties through introducing hydrogen and covalent bonding. Herein, carboxymethylagarose (CMA) and polyvinyl alcohol (PVA) acts as physical crosslinkers. Boric acid (BA) prompt the formation of crosslinking through hydrogen bonding with blend polymers followed by strong ionic bonding between hydroxyl (-OH) groups of PVA and borate ions of BA. Hydrogel obtained under optimum conditions shows excellent stretching (> 100 times), quick self-healing (< 1 Sec), notches insensitive stretching, fiber and film forming ability. Such integrated properties for a hydrogel system have been achieved using seaweed derived polymer for the first time. In summary, this study opens up a new possibility to design and assemble multifunctional hydrogels using abundant seaweed derived polysaccharides with outstanding stretching, healing plus other properties by simple crosslinking chemistry.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.034
       
  • Preparation and Application of Magnetic Zinc Pyridinedicarboxylic Acid
           Nanocomposite (Zn-(PDC)2@Fe3O4)

    • Authors: Shuai Zhang; Shoulian Wei; Hao Cheng; Wei Li
      Abstract: Publication date: Available online 3 January 2018
      Source:Arabian Journal of Chemistry
      Author(s): Shuai Zhang, Shoulian Wei, Hao Cheng, Wei Li
      Nano-scaled Fe3O4 were synthesized using solvothermal synthesis, and amino-modification of nano-scaled Fe3O4 was conducted with APTES. With Fe3O4-NH2 and Zn2+ as the metal centers, 2,6-pyridinedicarboxylic acids as the organic ligand, and using the one-step ultrasonic-assisted method, a new magnetic zinc pyridinedicarboxylic acid nanocomposite (Zn-(PDC)2@Fe3O4) was synthesized. The structure, composition and morphology of the products were characterized using methods such as X-ray single crystal diffraction, Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction, and scanning electron microscope. The results showed that the Zn-(PDC)2 was almost an octahedron, and the Zn-(PDC)2@Fe3O4 looked like a nanoflower. The mimetic peroxidase properties of Zn-(PDC)2@Fe3O4 were studied with H2O2 solution and TMB solution as the substrates, and the results showed that: the Michaelis constant of H2O2 by Zn-(PDC)2@Fe3O4 was: Km = 0.411 mM, the maximum reaction rate: v max = 3.440×10-8 M·s-1; the Michaelis constant of TMB by Zn-(PDC)2@Fe3O4 was: Km = 0.189 mM, and the maximum reaction rate: v max = 2.419×10-8 M·s-1, both of which were lower than those of H2O2 and TMB by Fe3O4 and Horseradish Peroxidase (HRP). Based on the reduction of the absorbance of original solution due to the consumption of H2O2 in oxidation-reduction reaction between SO3 2- and H2O2 under acid conditions, a new method for determining the content of SO3 2- was established. The linear range of SO3 2- was 8×10-7∼8×10-5 mol/L, the detection limit of SO3 2- was 8×10-8 mol/L, and the RSD of SO3 2- was 2.7∼9.2%.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.015
       
  • In-Situ Synthesis of CuO Nanoparticles in P(NIPAM-co-AAA) Microgel,
           Structural Characterization, Catalytic and Biological Applications

    • Authors: Jahanzeb Khan; Muhammad Siddiq; Bilal Akram; Muhammad Aqeel Ashraf
      Abstract: Publication date: Available online 2 January 2018
      Source:Arabian Journal of Chemistry
      Author(s): Jahanzeb Khan, Muhammad Siddiq, Bilal Akram, Muhammad Aqeel Ashraf
      The production of new multi-responsive poly(N-isopropylacrylamide-allyl acetic acid) [P(NIPAM-AAA)] copolymer microgel by free radical emulsion polymerization is reported. Inside this copolymer microgel CuO nanoparticles were generated by in situ reduction of copper nitrate followed by the air oxidation process, their fabrication is confirmed by powdered X-ray diffraction analysis and the average size of CuO NPs was found to be 24 nm having monoclinic shapes. By using dynamic laser light scattering the swelling & de-swelling behaviour of the pure microgel was examined at different temperature and pH values. The copolymer microgel becomes unstable at low pH as well as at high temperature values respectively.UV-visible spectra show a red shift in surface plasmon resonance λSPR of CuO nanoparticles. The catalytic property of hybrid microgel was inspected by observing the reduction of 4-nitrophenol into 4-aminophenol in the presence of excess NaBH4 with various concentrations of catalyst at room temperature. The hybrid microgels also have good anti-bacterial activity against both Gram-positive (C.Albicans) and Gram-negative (E. coli) bacteria.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.018
       
  • Electrocatalytic urea mineralization in aqueous alkaline medium using
           NiIIcyclam-modified nanoparticulate TiO2 anodes and its relationship with
           the simultaneous electrogeneration of H2 on Pt counterelectrodes

    • Authors: S. Murcio-Hernández; A.V. Rueda-Solorio; J.A. Banda-Alemán; C. González-Nava; F.J. Rodríguez; E. Bustos; F. Espejel-Ayala; A. Rodríguez; S. Sepúlveda; J. Manríquez
      Abstract: Publication date: Available online 2 January 2018
      Source:Arabian Journal of Chemistry
      Author(s): S. Murcio-Hernández, A.V. Rueda-Solorio, J.A. Banda-Alemán, C. González-Nava, F.J. Rodríguez, E. Bustos, F. Espejel-Ayala, A. Rodríguez, S. Sepúlveda, J. Manríquez
      NiIIcyclam-modified nanoparticulate TiO2-coated ITO electrodes (ITO/TiO2//NiIIcyclam) were prepared by electropolymerization of NiIIcyclam monomers to TiO2-coated ITO electrodes (ITO/TiO2) to improve electrocatalytic urea CO(NH2)2 oxidation in alkaline aqueous solutions. A high value adding secondary effect was the collection of electrons at Pt cathodes, to simultaneously generate H2 from water reduction. NiIIcyclam-modified ITO electrodes (ITO//NiIIcyclam) were also prepared by electropolymerization of NiIIcyclam monomers to bare ITO electrodes (ITO) for comparison purposes. In the presence of the TiO2 nanoparticles, the urea mineralization on NiIIcyclam coatings was doubled (23.95% − organic carbon removal at 120 min of electrolysis) compared to those without TiO2 nanoparticles (13.02% − organic carbon removal at 120 min of electrolysis). In agreement, the faradaic efficiency for H2 generation at the Pt cathode, electrically connected to an anode having TiO2 nanoparticles (0.99 at 120 min of electrolysis), was also twice as effective than that observed when the same Pt cathode was electrically connected to an anode without TiO2 nanoparticles (0.46 at 120 min of electrolysis). The experimental results indicated that the poisoning of NiII centers (which is caused by an excessive production of CO intermediates during the urea oxidation on both NiIIcyclam-modified anodes) was strongly inhibited in the presence of the nanoparticulate TiO2 NiIIcyclam junction. A final comparison between our results and those reported in selected publications revealed that the NiIIcyclam-modified nanoparticulate TiO2-coated ITO anodes here developed, constitutes a promising electrocatalytic system for performing direct urea mineralization at a relative short electrolysis time. Furthermore, the combination of the following phenomena: (a) effective charge separation on the semiconducting ITO nanoparticulate TiO2 junctions, (b) remarkable capabilities of the nanoporous TiO2 films for tunning the load of OH- anions demanded by the urea oxidation and, (c) outstanding capabilities of the TiO2 nanoparticles for capturing CO intermediates (at Ti3+ donor sites), successfully promoted the enhancement of the electron external transport to Pt cathodes, and consequently improved the faradaic efficiency associated to the cathodic generation of H2.
      Graphical abstract image

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.029
       
  • Molecules and Functions of Rosewood: Pterocarpus cambodianus

    • Authors: Lou Junwei; Chen Juntao; Ni Changyu; Wanxi Peng
      Abstract: Publication date: Available online 2 January 2018
      Source:Arabian Journal of Chemistry
      Author(s): Lou Junwei, Chen Juntao, Ni Changyu, Wanxi peng
      Pterocarpus is a high-end, expensive furniture materials collectively. Pterocarpus products have a certain human health function. In this paper, Pterocarpus cambodianus Pierre as an example, we study its human health components by using PY-GC-MS, TDS-GC-MS and GC-MS. The composition of known human health functions was studied by reviewing the literature. 1-Heptatriacotanol has anti-hypercholesterolemic effects. Cryptomeridiol is a natural product of anti-Alzheimer's disease and antispasmodic nature, and has a significant medicinal value. 7-Methyl-Z-tetradecen-1-ol acetate has the effect of heat and heat cough. .alpha.-Bisabolol can be used to treat leishmaniasis caused by Lactobacillus infants.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.030
       
  • Inside Front Cover - Editorial Board

    • Abstract: Publication date: January 2018
      Source:Arabian Journal of Chemistry, Volume 11, Issue 1


      PubDate: 2018-01-09T20:00:07Z
       
  • Systematic Characterization of Volatile Organic Components and Pyrolyzates
           

    • Authors: Li Liu; Xuexiang Cheng; Weiwei Zhao; Yunhao Wang; Xiang Dong; Lili Chen; Dangquan Zhang; Wanxi Peng
      Abstract: Publication date: Available online 31 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Lili Liu, Xuexiang Cheng, Linzuo Teng, Yunhao Wang, Xiang Dong, Lili Chen, Dangquan Zhang, Wanxi Peng
      Camellia oleiferaseed cake (COSC), a byproduct during oil production of C. oleiferaseeds, has been extremely abundant. However, due to the lack of systematic and in-depth analysis about the chemical composition of COSC, it is difficult to develop high value-added products, resulting in low processing efficiency or even directly abandoned. In this paper, the VOCs (Volatile organic components) characteristics of COSC and the variation rule of COSC groups before/after extraction were revealed, and the thermal loss law of COSC and the pyrolyzates characteristics at different temperatures were also explained. The main VOCs of ethanol extractive of COSC are alcohols, those of petroleum ether extractive are alkanes and organic acids, and those of benzene/ethanol extractive are esters. It is first reported here that rich 1,6,10-Dodecatrien-3-ol,3,7,11-trimethyl-, (E)-, namely nerolidol with wide use in cosmetics and biomedicine, exists in COSC extractives. In addition, bioactive VOCs such as β-caryophyllene, humulene and (E)-Atlantone were observed in three COSC extractives. The total content trend from high to low is petroleum ether extractive, ethanol extractive, benzene/ethanol extractive, indicating that petroleum ether extractive has the best developing prospects. The analytic results of FTIR further confirm that: (1) the COSC contains components including Si compounds, ethers, organic acids, esters and alcohols, (2) the four kinds of organic silicon detected are naturally occurring components in COSC, and (3) organic solvent extraction does not make compound groups of COSC significantly changed. There are four obvious stages in thermogravimetry treatment of COSC: the first (30°C-100°C), the second (180°C-240°C), the third (240°C-400°C), and the fourth (400°C-567°C), and the order of the mass loss is the third, the second, the fourth and the first. During thermogravimetry treatment, three critical turning points of temperature (240°C, 400°C and 567°C) were observed, accompanied by significantly chemical changes such as macromolecule pyrolyzed into small volatile molecules. The four COSC extractive pyrolyzates at 300°C, 450°C, 600°C and 750°C have different content variation in the components, such as heterocyclic type with a high-low-high-low change, hydrocarbons and acids shown by the high-low-low-high process, and ketone and the alcohol with a low-high-low-high change. The 450°C pyrolyzates of COSC residue after extraction are heterocyclic, ketone, phenolic more than esters, hydrocarbons, phosphide, acids, aldehydes, alcohols and acyl; the 600°C pyrolyzates are heterocyclic, ketone, phenolic more than esters, ammonium, phosphide, acid, aldehydes and alcohols. Here, a large number of new components are produced in the pyrolysis treatment for COSC extractive and residue, providing a new approach for the high-grade application of COSC.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.031
       
  • Molecules and Functions of Rosewood: Diospyros celebica

    • Authors: Juntao Chen; Changyu Ni; Junwei Lou; Wanxi Peng
      Abstract: Publication date: Available online 29 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Juntao Chen, Changyu Ni, Junwei Lou, Wanxi Peng
      Pterocarpus and Pterocarpus products have certain human health function. In this paper, Diospyros celebica Bakh as an example, we study its human health components by using PY-GC-MS, TDS-GC-MS and GC-MS.The composition of known human health functions was studied by reviewing the literature. 3-O-Methyl-d-glucose has a certain conservation property, and it can protect the pancreatic B cells against the toxicity of alloxan. P-Cresol plays a role in endothelial dysfunction in uremic patients, and it can repair wounds and reduce endothelial progression. 2(3H)-Furanone, 5-methyl- has certain biological resistance, and has high antimicrobial activity against NCIM 2501 and NCIM 5021.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.033
       
  • Molecules and Functions of Rosewood: Dalbergia stevenson

    • Authors: Shuai Cheng Jiang; Sheng Bo Ge; Wanxi Peng
      Abstract: Publication date: Available online 29 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Shuai Cheng Jiang, Sheng Bo Ge, Mu Zi Wang, Wanxi Peng
      In this paper, the organic solvent extract was analyzed by Fourier transform infrared spectroscopy (FT-IR) and gas chromatography-mass spectrometry (GC-MS), TG, Py-GC-MS and TD-GC-MS were used to analyze the Dalbergiastevenson. And then, the pyrolysis products were analyzed by GC-MS. The chromatographic peak area normalization method was used to calculate the groups The relative content of the points. The results show that there are many kinds of bioactive ingredients in the berzolis sandalwood extract, mainly some alcohols and phenolic compounds. And in bio-energy, bio-medicine, cosmetics, skin care products and spices and other fields have potential application prospects.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.032
       
  • Hemicellulose structural changes during steam pretreatment and
           biogradation of Lentinus Edodes

    • Authors: Shengbo Ge; Xiangmeng Chen; Dongli Li; Zhenling Liu; Hui Ouyang; Wanxi Peng; Zhongfeng Zhang
      Abstract: Publication date: Available online 29 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Shengbo Ge, Xiangmeng Chen, Dongli Li, Zhenling Liu, Hui Ouyang, Wanxi Peng, Zhongfeng Zhang
      To disclosed the internal factors for the growth of mycelium and Lentinus edodes, Quercus Linn wood, which was biotransformed during the artificial cultivation of Lentinus edodes, were synergistically characterized by TGA/DTG, FT-IR and NMR. The results showed that the different ingredients of hemicellulose decreased during steam explosion and biodegradation of Lentinus edodes, however hemicellulose content continued to increased. FT-IR showed that the transmittance of the characteristic peaks in hemicellose gradually increased after decreased after steam explosion and biodegradation of Lentinus edodes. TGA/DTG curves that thermal stability and maximum thermal degradationrates of hemicelloses were contiguous after steam explosion and biodegradation of Lentinus edodes. Structural determination based on FT-IR and 1H, and 2D-HSQC NMR analyses showed that the alkali-extractable hemicelluloses shared the structure composed of (1→4)-linked β-D-xylopyranosyl backbone with 4-O-methyl-R-D-glucuronic acid attached to O-2 of the xylose residues and L-arabinose attached to O-3 of the xylose residues. And it revealed that the extractable hemicelluloses retained original structure without cleaving chemical linkages. Furthermore, a small amount of other minor hemicelluloses (β-glucans) including xylans in the extractable hemicelluloses could be identified by NMR and other approaches.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.022
       
  • Preparation and Properties of Novel Flame-retardant PBS Wood-plastic
           Composites

    • Authors: ShuaiCheng Jiang; YaFeng Yang; ShengBo Ge; ZhongFeng Zhang; WanXi Peng
      Abstract: Publication date: Available online 29 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): ShuaiCheng Jiang, YangQiang Wei, ShengBo Ge, WanXi Peng
      Poly (butylene succinate) (PBS), as a fully biodegradable thermoplastic, have developed rapidly due to its integrated performance and processibility. The CaCO3 as a reinforcing component, and AHP, APP and CaHP as a flame-retardant component were separately incorporated into PBS matrix. A series of PBS-based composites were fabricated via melting blending using internal mixer followed by injection molding. The results show that the different filling ratio has a certain influence on the mechanical properties of the composites. When the filling amount of wood powder is 40 copies, the composite mechanical properties of the composite is better. CaCO3 addition, the composite material of the bending strength, tensile strength have improved significantly. The results showed that small amount of AHP, APP and CaHP improved the tensile strength of PBS composites, however, the tensile strength decreased as further increase amount of AHP, APP and CaHP. Cone Calorimeter testing revealed that, the combination of AHP, APP and CaHP could significantly reduce the pHRR and the total heart release (THR) of the composites. TGA test indicated that the addition of AHP, APP and CaHP could significantly increase the char residue and reduce the mass loss rate. TGA test indicated that the addition of AHP, APP and CaHP could significantly increase the char residue and reduce the mass loss rate. Through the research of mechanical and thermal properties of PBS composite, it could lay a foundation of the application of PBS composite in different fields.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.023
       
  • Potential use of different kinds of carbon in production of decayed wood
           plastic composite

    • Authors: Sheng-bo Ge; Hai-Ping Gu; Jiao-jiao Ma; Hong-Qi Yang; Shuai-cheng Jiang; Zhenling Liu; Wan-xi Peng
      Abstract: Publication date: Available online 29 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Sheng-bo Ge, Jiao-jiao Ma, Shuai-cheng Jiang, Zhenling Liu, Wan-xi Peng
      This study investigated the mechanical, chemical structure and thermal properties of hot press molded wood plastic composite (WPC) panels produced from different amounts (30, 40, or 50% weight) of decayed Pinus massoniana Lamb. and polypropylene with chitosan(3 wt%) and different kind of carbon(2 wt%). The results were compared with the properties of WPC produced without carbon. The mechanical, chemical structure and thermal data showed that WPC with carbon was better than WPC without carbon, and the best condition to produce decayed wood plastic composite was hot pressing temperature at 170°C for12min, Carbon Nanotubes(CNT) and chitosan(CS) accounting for 2% and 3% of total mass, and the proportion of decayed wood and PVC is 40% and 60% .

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.026
       
  • Zno/Nio Coated Multi-Walled Carbon Nanotubes for Textile Dyes Degradation

    • Authors: Jahanzeb Khan; Sadia Ilyas; Bilal Akram; Khalil Ahmad; Muhammad Hafeez; Muhammad Siddiq; Muhammad Aqeel Ashraf
      Abstract: Publication date: Available online 28 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Jahanzeb Khan, Sadia Ilyas, Bilal Akram, Khalil Ahmad, Muhammad Hafiz, Muhammad Siddiq, Muhammad Aqeel Ashraf
      The nanocomposites of ZnO/NiO loaded Multiwalled Carbon Nanotubes (MWNTs) were successfully fabricated using co-precipitation method. The synthesized photocatalyst were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX) spectroscopy, Diffused reflectance spectroscopy (DRS) and Fourier transform infrared spectroscopy (FTIR) for the determination of crystal structure, morphology, elemental composition and optical properties respectively. The photocatalytic activity of as prepared photocatalyst was determined by monitoring the degradation of methyl orange (an azo dye) under ultra-violet (280 nm) and visible (480 nm) irradiation. The Diffuse reflectance spectra (DRS) exhibits absorbance tail around 400 nm, in the near UV region. SEM analysis shows the homogenous dispersion of ZnO and NiO on the surface of MWNTs. The efficiency for Photodegradation of ZnO coated MWNTs is shown to be greater than the efficiency of pristine ZnO. When NiO was loaded on the surface of MWNTs having ZnO coated layer, the activity was further enhanced and reached maximum for 3% NiO loading. The degradation in visible region is believed to be proceeding through self-sensitized degradation of pre-adsorbed dye. A different behavior for degradation was observed for ZnO coated MWNTs and ZnO/NiO coated MWNTs, which suggests that complete mineralization of azo dyes can be achieved in a self-sensitized degradation process after employing ZnO/NiO coated MWNTs.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.020
       
  • New method for effective identification of adulterated Camellia oil basing
           on Camellia oleifera-specific DNA

    • Authors: Xuexiang Cheng; Zhenling LIU Tao Yang Yunhao Wang Yan Linzuo
      Abstract: Publication date: Available online 28 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Xuexiang Cheng, Zhenling LIU, Tao Yang, Yunhao Wang, Li Yan, Linzuo Teng, Fangbin Wang, Lili Chen, Yan He, Kunpeng Guo, Dangquan Zhang
      Camellia oil obtained from Camellia oleifera seeds is rich in unsaturated fatty acids and unique flavors, and has become a rising high-quality edible vegetable oil in the world. However, honored as the “Oriental olive oil”, Camellia oil was widely adulterated for the situation of high price and short supply. At present, the identification of adulterated plant edible oil is mainly based on the composition and content of fatty acids. Here, the fatty acid composition and content of the main vegetable edible oils were determined. It is found that the fatty acid composition and content are susceptible to the change of the origin, variety and climate of the raw materials, and adulterated oils could even be made extremely similar to Camellia oil by the target combination of fatty acid content, therefore it is difficult to accurately identify the adulteration of Camellia oil through the composition and content determination of fatty acids. Camellia oleifera DNA was used as the breakthrough point for adulteration identification. Basing on the EST library and transcriptome data of Camellia oleifera, 116 candidate specific DNAs were screened out by bioinformatics, then the optimized methods of trace DNA extraction in Camellia oil were established. Further, three specific Camellia oleifera DNAs that could only be PCR amplified using Camellia oil- extracted DNA as template were finally screened out, which were confirmed by exclusive PCR amplifications using DNAs of other edible oils as templates. One of the specific DNAs was used to make the concentration regression curves of trace DNA by qPCR (Quantitative real-time PCR). The computational model was successively established between the adulteration ratio and the Ct value of the qPCR by adulteration imitation of different proportions of Camellia oil. Finally, a complete identification system of Camellia oil adulteration was firstly established basing on the specific DNA of Camellia oleifera, and it may provide a new idea and method for identification of adulterated Camellia oil.

      PubDate: 2018-01-09T20:00:07Z
       
  • Heat transfer and fouling behaviors of super hydrophobic nanotube-array
           coating on titanium substrate in pool boiling

    • Authors: Yan
      Abstract: Publication date: Available online 28 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Yan Lv
      Superhydrophobic nanotube-array coating on titanium substrate was fabricated by using electrochemical anodic oxidation method with ultrasonic assistance and fluoroalkyl silane modification. Surface morphology and wettability of the superhydrophobic coating were characterized via scanning electron microscope and optical static contact angle measuring device. Expeimental investigation was carried out to assess the heat transfer property and fouling behavior of superhydrophobic titanium-based nano-porous coating in pool boiling by using pool boiling experimental device. Superhydrophilic titanium-based nano-porous surface and bare titanium substrate surface were also investigated as contrasts. The results indicated that, compared with superhydrophilic titanium-based nano-porous surface and bare titanium substrate surface, the heat transfer property of superhydrophobic titanium-based nano-porous coating was superior to bare titanium substrate and superhydrophilic titanium-based nano-porous surface because it could produce more bubble nucleation sites which were beneficial to heat transfer. Superhydrophilic titanium-based nano-porous surface presented the worst heat transfer property. Besides, superhydrophobic nano-porous coating also had better antifouling property in pool boiling heat transfer, while superhydrophilic nano-porous surface was easier to deposite fouling.

      PubDate: 2018-01-09T20:00:07Z
       
  • A polycarboxylate as a superplasticizer for montmorillonite clay in
           cement: Adsorption and tolerance studies

    • Authors: Gang Chen; Jiaheng Lei; Yong Du; Xiaodi Du; Xuebing Chen
      Abstract: Publication date: Available online 28 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Gang Chen, Jiaheng Lei, Yong Du, Xiaodi Du, Xuebing Chen
      A novel polycarboxylate superplasticizer (PCE) with a long polyoxyethylene (PEO) chain and a terminal carboxylic group was synthesized from a modified polyether (SAE-IPEG) to increase its performance in cement. The molecular structure of the PCE was characterized by infrared spectroscopy and 1H nuclear magnetic resonance (NMR) spectroscopy. The performance of synthesized PCE in cement was studied in the absence and the presence of montmorillonite (Mmt) clay. It was found that the PCE disperses in cement uniformly without aggregation, which is different significantly from the conventional PCEs. Adsorption measurements and X-ray diffraction analysis revealed that the synthesized PCE only interacted with Mmt via surface adsorption, whereas the conventional PCEs interact with the clay through the surface adsorption and the chemical intercalation. Such dramatic change could be ascribed to the introduction of an electronegative carboxylic acid group as a terminal group into the long polyoxyethylene chain of PCE, which reduced the adsorption and enhanced tolerance of PCE on Mmt.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.027
       
  • Synthesis of highly water-dispersible N-doped anatase titania based on low
           temperature solvent-thermal method

    • Authors: Wenyi Huang; Hao Cheng; Jun Feng; Zhipeng Shi; Dawei Bai; Lijun Li
      Abstract: Publication date: Available online 28 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Wenyi Huang, Hao Cheng, Jun Feng, Zhipeng Shi, Dawei Bai, Lijun Li
      In this paper, the high-concentration aqueous dispersion N-doped anatase TiO2 is prepared based on low temperature non-aqueous solvent-thermal method by using TCl4 and NH4Cl as titanium source and nitrogen source respectively. From TEM image, we can learn that the particle is composed of spindle-shaped particles with the size from 8 to 15 nm. According to the XRD and XPS spectra of N-doped TiO2, it can be seen that, during the synthesis process, N atoms permeate into the TiO2 lattice, and the impurity level can be formed within the band gap of TiO2. The impurity level can extend to absorb UV and the visible light. As for N-doped TiO2 nanoparticle of XPS spectrum, ethanol is used as solvent to form carbonaceous species on the surface of TiO2. The carbonaceous species in visible light can excite electrons towards the TiO2 conduction band, so as to increase the number of electrons in the conduction band under visible light to improve the catalytic activity of TiO2 which possesses the feature of high catalytic activity under UV-visible light.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.028
       
  • Nano Properties Analysis Via Fourth Multiplicative ABC Indicator
           Calculating

    • Authors: Wei Gao; Weifan Wang; Darko Dimitrov; Yiqiao Wang
      Abstract: Publication date: Available online 27 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Wei Gao, Weifan Wang, Darko Dimitrov, Yiqiao Wang
      In the field of nanoscience, there are a large number of new nanomaterials produced in the laboratory every year. These nanomaterials need to go through a lot of tests in engineering application before, to determine their physical, chemical and nanomedicine properties. The work demands a large number of experimental personnel, equipment and reagents, and it’s time-consuming as well. In the theoretical nanoscience, the various features can be obtained through the computation of topological index on nano molecular structures. In this paper, we study the fourth multiplicative atom-bond connectivity indices of some special molecular structures which commonly appeared in the compound of nanomaterials, and their specific expressions are given. The results yielded in this work will be a guidance for the practical nanoscience applications.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.024
       
  • One-step synthesis of reduced graphene oxide/gold nanoparticles under
           ambient conditions

    • Authors: R. Britto Hurtado; M. Cortez-Valadez; J.R. Aragon-Guajardo; J.J. Cruz-Rivera; F. Martínez-Suárez; M. Flores-Acosta
      Abstract: Publication date: Available online 27 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): R. Britto Hurtado, M. Cortez-Valadez, J.R. Aragon-Guajardo, J.J. Cruz-Rivera, F. Martínez-Suárez, M. Flores-Acosta
      This study presents a novel synthesis method for the production of reduced-graphene-oxide functionalized with gold nanoparticles (rGO/Au-NPs) at ambient temperature. Both were obtained simultaneously using sucrose and chloroauric acid as precursors in the formation of the nanocomposite, and ascorbic acid as the reducing and stabilizing agent. Transmission electron microscopy (TEM) showed gold nanoparticles of 15–30 nm interacting with rGO laminates. Raman spectroscopy showed bands D and G centered at 1334 cm−1 and 1577 cm−1, respectively. The optical absorption analysis presented two bands centered at 522 nm and 260 nm, similar to the results reported in literature for Au-NPs and rGO.

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.021
       
  • Voltammetric determination of capsaicin using
           CeO2-surfactant/SWNT-modified electrode

    • Authors: Guzel Ziyatdinova; Endzhe Ziganshina; Aliya Shamsevalieva; Herman Budnikov
      Abstract: Publication date: Available online 27 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Guzel Ziyatdinova, Endzhe Ziganshina, Aliya Shamsevalieva, Herman Budnikov
      Glassy carbon electrodes (GCE) modified with carboxylated single-walled carbon nanotubes (SWNT-COOH) and CeO2-surfactants dispersions are developed for the capsaicin quantification. The effect of cationic cetylpyridinium bromide (CPB), anionic sodium dodecylsulfate (SDS) and nonionic Triton X100 as co-modifiers are tested. CeO2-CPB/SWNT-COOH/GCE provides 2.8- and 1.9-fold increase of capsaicin oxidation currents in comparison to bare GCE and SWNT-COOH/GCE, respectively, confirming the synergetic effect of the modifiers. Scanning electron microscopy (SEM) data confirm successful immobilization of the nanomaterials on the electrode surface leading to the significant changes in its morphology. The parameters of capsaicin electrooxidation are found. Differential pulse mode is applied for the capsaicin determination. The pulse parameters are optimized. The linear dynamic ranges of 0.10–7.5 and 7.5–500 μM of capsaicin with the limits of detection and quantification of 28 and 92 nM respectively confirm the high sensitivity of the method developed. The selectivity of the electrode toward capsaicinoids is proved. The method was applied for the total capsaicinoids quantification in real samples (red hot pepper spices and tinctures of Capsicum annuum L.). A good agreement with the UV-spectroscopic data is obtained.
      Graphical abstract image

      PubDate: 2018-01-09T20:00:07Z
      DOI: 10.1016/j.arabjc.2017.12.019
       
  • Synthesis, Characterisation and Photocatalytic performance of ZnS coupled
           Ag2S Nanoparticles: A Remediation Model for Environmental Pollutants

    • Authors: Maryan Abbasi; Uzaira Rafique Ghulam Murtaza Muhammad Aqeel Ashraf
      Abstract: Publication date: Available online 26 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Maryan Abbasi, Uzaira Rafique, Ghulam Murtaza, Muhammad Aqeel Ashraf
      The growing demand of industries has led to environmental degradation due to excessive release of toxic chemicals. Nanotechnology has developed to combat the impacts integrated with industrial revolution. The present investigation proposes a remediation model for toxic dyes and poly aromatic hydrocarbons by effective use of nanotechnology. For this purpose, zinc sulphide (ZnS), silver sulfide (Ag2S)and bimetallic ZnS-Ag2S are synthesized from a single source precursor and evaluated as potential photocatalytic agents. The synthesized nanoparticleswere characterized by a range of techniques like UV-visible, PL, XRD, EDX, TEM and TGA. The results indicated that preparednanoparticles were crystalline, spherical in shape, possess obvious atomic planes with a size in the range of 6-12nm. Each of the synthesized material was tested as potential photocatalyst candidate for the degradation of representative azo-dyes (Crystal Violet, Congo Red) and polyaromatic hydrocarbons (Naphthalene, Phenanthrene and Pyrene)under visible light irradiation source. The degradation efficiency of the synthesized nanoparticles was calculated to be more than 70% for Crystal Violet and 80%for Congo Red upon contact with the dye solutions for 50 minutes and pseudo second order kinetic model was found to be the best fit. The synthesized nanoparticleswere also effective in its own significance for the degradation of polyaromatic hydrocarbons. The fragmentation study of polyaromatic hydrocarbons using nanoparticles postulates that phthalic acid pathway is the predominant mechanism for PAHs.It is recommended that environmental compartment with mix pollutants can conveniently be treated with a single material to an appreciable extent. The study offers economical and environment friendly remediation model.

      PubDate: 2018-01-09T20:00:07Z
       
  • Thermal, photo-oxidation and antimicrobial studies of linalyl acetate as a
           major ingredient of lavender essential oil

    • Authors: Suzan Khayyat
      Abstract: Publication date: Available online 24 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Suzan Khayyat
      Lavender oil, obtained from the flowers of Lavandula angustifolia (Family: Lamiaceae) by steam distillation, The major component of lavender oil is linalyl acetate was isolated and subjected to oxidation thermally and photochemically using (mcpba and H2O2) respectively to produce mixture of 6,7-epoxy-3,7-dimethyl-1-octene-3-yl acetate (3) and 1,2-epoxy-3,7-dimethyl-6-octene-3-yl acetate (4) photochemicaly, While produced epoxide 4 only thermally . On the other hand, photooxygenation of 1 using different singlet oxygen sensitizers gave two hydroperoxide derivatives of 6-hydroperoxy-3, 7-dimethylocta-1,7-diene-3-yl acetate (5) and 7-hydroperoxy-3,7-dimethylocta-1,5-diene-3-yl acetate (6) in the presence of tetraphenyl porphin (TPP), whereas gave hydroperoxide 6 only using hematoporphyrin (HP). Studies on the antimicrobial especially Microsporum canis and Microsprum gallinna showed that linalyl acetate and its epoxide and hydroperoxide derivatives have a good antibacterial action.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.008
       
  • Molybdenum Disulfide (MoS2) Nanosheets Vertically Coated on Titanium for
           Disinfection in the Dark

    • Authors: Kaiwei Tang; Lanyu Wang; Hao Geng; Jiajun Qiu; Huiliang Cao; Xuanyong Liu
      Abstract: Publication date: Available online 24 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Kaiwei Tang, Lanyu Wang, Hao Geng, Jiajun Qiu, Huiliang Cao, Xuanyong Liu
      Previous studies demonstrated that the antibacterial action of molybdenum disulfide (MoS2) is highly dependent on the light-activated potential of reactive oxygen species (ROS) generation; here vertically aligned molybdenum disulfide nanosheets (MoS2, with or without doping of iron) were coated on titanium (Ti) substrates via a one-step hydrothermal reaction, and their excellent activity against both Escherichia coli (E. coli, ATCC 25922) and Staphylococcus aureus (S. aureus, ATCC 25923) was evidenced under dark conditions. Release of MoO4 2- and generation of MoS2-inspired ROS were found to be the key factors answering for the bactericidal property of the nanosheets. What’s more, iron-doping in terms of FeMoO4 could boost the antibacterial efficacy further, which stems from quick release of Fe2+ and generation of ROS by Fenton-like reactions. Accordingly, it is believed that the dark antibacterial efficacy of the vertically aligned MoS2 nanosheets is guaranteed by uniting ion release and ROS generation. This study provides new insight into design and application of MoS2 coatings for disinfection of biomedical devices, where light is hard to be served.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.013
       
  • Synthesis, characterizations, and antibacterial properties of PbMoO4
           nanocrystals

    • Authors: J.V.B. Moura; T.S. Freitas; A.R.P. Silva; A.T.L. Santos; J.H. da Silva; R.P. Cruz; R.L.S. Pereira; P.T.C. Freire; C. Luz-Lima; G.S. Pinheiro; H.D.M. Coutinho
      Abstract: Publication date: Available online 24 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): J.V.B. Moura, T.S. Freitas, A.R.P. Silva, A.T.L. Santos, J.H. da Silva, R.P. Cruz, R.L.S. Pereira, P.T.C. Freire, C. Luz-Lima, G.S. Pinheiro, H.D.M. Coutinho
      This study reports the synthesis and characterization of PbMoO4 nanocrystals and the antibacterial properties and modulation of their antibiotic activity. Lead molybdate nanocrystals were obtained through the conventional hydrothermal method, and the structural, vibrational and morphological properties of the sample were determined using X-ray diffraction, Raman and infrared spectroscopy, and scanning electron microscopy images. The obtained samples present scheelite-type tetragonal structure (space group I41/a) without secondary phases, and the Raman spectrum shows the formation of PbMoO4 structurally ordered at short-range, confirming the quality of the samples. The antibacterial and antibiotic-modulation activities were performed in triplicate using the microdilution method. The minimum inhibitory concentration (MIC) of antibiotics alone or in association with PbMoO4, were demonstrated using geometric mean. When assayed directly, the PbMoO4 presented a MIC ≥ 1024 μg/mL against all bacterial strains tested. When in association with the gentamicin against Staphylococcus aureus, a synergism was observed reducing 37.5% the MIC. However, in the assays against the Gram-negative strains was observed that the presence of lead affected the effect of the antibiotic, leading to an antagonism.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.014
       
  • Broad spectral inhibitory effects of pale green zinc oxide nanophosphor on
           bacterial and fungal pathogens

    • Authors: H.J. Amith Yadav; B. Eraiah; H. Nagabhushana; B. Daruka Prasad; R.B. Basavaraj; M.K. Sateesh; J.P. Shabaaz Begum; G.P. Darshan; G.R. Vijayakumar
      Abstract: Publication date: Available online 21 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): H.J. Amith Yadav, B. Eraiah, H. Nagabhushana, B. Daruka Prasad, R.B. Basavaraj, M.K. Sateesh, J.P. Shabaaz Begum, G.P. Darshan, G.R. Vijayakumar
      Nd3+ doped zinc oxide nanophosphor were prepared by a modified sonochemical route. Adsorption of aloe vera (A.V.) gel by the precursors made the final product with controlled the morphology, that is A.V. gel acted as surfactant. Characterization studies confirmed the pure hexagonal phase with nanostructure, wide-bandgap was reported. Major electronic transitions in the prepared samples were due to 4f shell electrons of Nd3+ions. Emission peaks attributed to 2P3/2→ 4I13/2, 2P3/2→4I15/2, 1I6→3H4, 2P1/2→4I9/2 and 4G7/2→4I9/2 transitions under the excitation wavelength of 421 nm. The emitted wavelengths showed the redshift from blue to pale green region. Further, the prepared samples showed very good control over the growth of microbial pathogens such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa, Alternaria alternata and Fusarium oxysporum. The proposed mechanism is that the ZnO:Nd3+ intertwinds the bacteria and fungal pores with a heterogeneous range of superstructues, resulting in the local perturbation at cell membrane of fungal cells. This induces the decrease the potential energy at bacterial membrane and the leakage of electrolytes of fungal spores. There is a mechanical wrapping interaction between pathogens and the nanoparticles which locally damages the cell membrane and causes cell lysis. Biocompatible, ZnO:Nd3+ nanostructures possesses antibacterial activity against more multi-resistant bacterial and fungal phytopathogens. This additional information provides useful scientific information to prevent the various crop diseases.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.012
       
  • Development and validation of RT-HPLC-DAD method for biogenic amines
           determination in probiotic yogurts

    • Authors: Carla Paulo Vieira; Marion Pereira da Costa; Vitor L.M. Silva; Beatriz da Silva Frasao; Letícia F.M. Campos de Aquino; Yves E.C. de Oliveira Nunes; Carlos Adam Conte-Junior
      Abstract: Publication date: Available online 16 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Carla Paulo Vieira, Marion Pereira da Costa, Vitor L.M. Silva, Beatriz da Silva Frasao, Letícia F.M. Campos de Aquino, Yves E.C. de Oliveira Nunes, Carlos Adam Conte-Junior
      A new procedure for the determination of biogenic amines (BAs), putrescine, cadaverine, spermidine, spermine and tyramine, based on the purification through precipitation and centrifugation of peptides in an acid extract from the sample is proposed. The novelty of the procedure in relation to the liquid-liquid purification reported in the literature is based on shortening the time of analysis and reducing BAs losses during sample preparation. The procedure permitted better precision, recovery, and sensibility, particularly in lower concentration levels, when compared to extraction without purification before derivatization. The method was applied to the simultaneous determination of the five aforementioned BAs in commercial yogurt samples by reversed-phase high-performance liquid chromatography (RP-HPLC). The procedure presented adjusted correlation coefficients between 0.980 and 0.997, and linear range in samples of 1-50 mg.L-1 (cadaverine), 3-50 mg.L-1 (putrescine, spermidine and spermine) and 5-50 mg.L-1 (tyramine), with accuracy ranging from 67.81% to142.78% in the limit of quantification (LOQ) and from 88.99% to118.26% in other concentration levels. The limit of detection of BAs in yogurt samples was 0.18-4.01 mg.L-1, while LOQ ranged between1-5 mg.L-1. The intraday relative standard deviation was ≤ 15.74% in LOQ and ≤ 10.05% in other concentration levels. The purification step by precipitation was fundamental to eliminate the interferences present in the yogurt samples, and it was relevant to increase the sensitivity of BAs detection when compared to liquid-liquid purification.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.010
       
  • Influence of oxygen functionalization on physico-chemical properties of
           imidazolium based ionic liquids - experimental and computational study

    • Authors: Aleksandar Tot; Črtomir Podlipnik; Marija Bešter-Rogač; Slobodan Gadžurić; Milan Vraneš
      Abstract: Publication date: Available online 16 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Aleksandar Tot, Črtomir Podlipnik, Marija Bešter-Rogač, Slobodan Gadžurić, Milan Vraneš
      In this work, four different oxygen functionalized ionic liquids, 1-(3-hydroxypropyl)-3-methylimidazolium chloride,[OHC3mIm][Cl], 1-(3-hydroxypropyl)-3-ethylimidazolium chloride ([OHC3eIm][Cl], 1-(2-oxobutyl)-3-methylimidazolium chloride,[C2OC2mIm][Cl] and 1-(4-hydroxy-2-oxobutyl)-3-methylimidazolium chloride, [OHC2OC2mIm][Cl] were synthesized in liquid state at room temperature. Detailed physico-chemical characterisation (density, viscosity and conductivity) supported with computational simulations for pure ionic liquid and their aqueous solutions were performed. Based on these examinations, interactions in pure ionic liquids and interactions between water and synthesized ionic liquids were discussed.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.011
       
  • A Novel Interfacial Polymerization Approach Towards Synthesis of Graphene
           Oxide-incorporated Thin Film Nanocomposite Membrane with Improved Surface
           Properties

    • Authors: G.S. Lai; W.J. Lau; P.S. Goh; Y.H. Tan; B.C. Ng; A.F. Ismail
      Abstract: Publication date: Available online 15 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): G.S. Lai, W.J. Lau, P.S. Goh, Y.H. Tan, B.C. Ng, A.F. Ismail
      The conventional interfacial polymerization (IP) technique that requires a rubber roller in removing amine aqueous solution is likely to cause uneven distribution of nanomaterials on microporous substrate during thin film nanocomposite (TFN) membrane fabrication. A novel IP technique was developed in this work to pre-coat the substrate with graphene oxide (GO) nanosheets followed by vacuum filtration of amine aqueous solution through the substrate before initiating polyamide cross-linking process. This novel technique was also employed to fabricate a composite membrane that contained no nanomaterials. The results showed that the GO-incorporated TFN membrane exhibited 71.7% and 129.4% higher pure water flux compared to the composite membranes without GO incorporation that were synthesized using conventional and filtration IP technique, respectively. The water enhancement of the TFN membrane could be attributed to the existence of hydrophilic GO that was distributed evenly throughout the substrate surface coupled with the formation of porous selective layer that reduced water transport resistance. Besides exhibiting promising rejection against divalent ions, the newly developed TFN membrane also showed significantly lower water flux deterioration in filtrating bovine serum albumin and Reactive Black 5 solution. The enhanced membrane antifouling resistance was mainly due to the improved membrane surface properties that minimize deposition and adsorption of foulants on the TFN membrane surface.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.009
       
  • Manganese porphyrins as efficient catalysts in solvent-free cyclohexane
           oxidation

    • Authors: Mariana Goes de Araujo Tôrres; Vinicius Santos da Silva; Ynara Marina Idemori; Gilson DeFreitas-Silva
      Abstract: Publication date: Available online 14 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Mariana Goes de Araujo Tôrres, Vinicius Santos da Silva, Ynara Marina Idemori, Gilson DeFreitas-Silva
      Novel non-symmetric third-generation manganese metalloporphyrins, chlorido(5-(4-nitrophenyl)-10,15,20-triphenyl-2,3,7,8,12,13,17,18 octobromoporphyrinate)manganese(III) (MnBr8P1) and the mixture of isomers chlorido(5,10-(4-nitrophenyl)-15,20-diphenyl-2,3,7,8,12,13,17,18 –octabromopor-phyrinate)manganese(III) and chlorido(5,15-(4-nitrophenyl)-10,20-diphenyl-2,3,7,8,12,13,17,18-octabromoporphyrinate)manganese(III) (cis/trans-MnBr8P2) were obtained from their second-generation analogues (MnP1 and cis/trans-MnP2). These four catalysts were used in cyclohexane oxidation reactions with iodosylbenzene (PhIO) or iodobenzene diacetate (PhI(OAc)2) in the presence or absence of solvent (CH2Cl2). Cyclohexanol (Cy-ol) and cyclohexanone (Cy-one) were the sole reaction products. Regardless of the system, third-generation catalysts MnBr8P1 and cis/trans-MnBr8P2 performed better than second-generation catalysts (MnP1 and cis/trans-MnP2, respectively). In solvent systems, cis/trans-MnBr8P2 afforded a greater total yield (%Cy-ol +%Cy-one) than systems using MnBr8P1, with an increase from 80 to 89% in PhIO and from 47 to 57% in PhI(OAc)2. The systems without solvent, showed to be viable and presented significant yields with PhIO as oxidant, with total yield of 30% for MnBr8P1, and 55% for cis/trans-MnBr8P2. Additionally, in systems with third-generation catalysts without solvent, selectivity was close to 100% for Cy-ol.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.007
       
  • Preparation of porous hybrid adsorbents based on fluor(calcium
           silicate)/activated carbon and its application in the removal of iron
           (III) from ammonium phosphate solutions

    • Authors: Xin-hua Zhu; Jun Li; Yang Jin; Yun-hai Guo
      Abstract: Publication date: Available online 13 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Xin-hua Zhu, Jun Li, Yang Jin, Yun-hai Guo
      The high concentration of Fe3+ ions present in ammonium phosphate solutions have a significant effect on product quality and product morphology. Herein, hybrid adsorbents fluor(calcium silicate)/activated carbon (FCS/AC) combined with fluor(calcium silicate) (FCS) and activated carbon (AC) were prepared, characterized, and applied in the removal of Fe3+ ions from ammonium phosphate solutions. FCS/AC held both advantages of FCS and AC indicating a significant adsorption for Fe3+ ions. The adsorption kinetics, isotherms and thermodynamics of Fe3+ onto FCS/AC were investigated. The effect of solution pH, initial Fe3+ concentration, temperature and contact time on the adsorption of Fe3+ onto FCS/AC were also investigated. Desorption-resorption experiments of FCS/AC for Fe3+ ions were examined by the batch method using different eluents. The results showed that FCS/AC was an excellent, low cost and reusable adsorbent for the removal of Fe3+ ions from ammonium phosphate solutions, and the adsorption process appeared to follow the pseudo-second-order kinetic model and Langmuir isotherm model with a maximum Fe3+ adsorption of 15.41 mg/g. Various thermodynamic parameters such as △G 0, △H 0 and △S 0 were calculated indicating the feasibility of the process and spontaneous nature of the adsorption.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.006
       
  • Effect of l-threonine on growth and properties of ammonium dihydrogen
           phosphate crystal

    • Authors: J.H. Joshi; S. Kalainathan; D.K. Kanchan; M.J. Joshi; K.D. Parikh
      Abstract: Publication date: Available online 13 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): J.H. Joshi, S. Kalainathan, D.K. Kanchan, M.J. Joshi, K.D. Parikh
      Ammonium dihydrogen phosphate (ADP) is an important nonlinear optical (NLO) material used for electro-optical applications and finds various NLO applications using Nd:YAG and Nd:YLF Lasers. The Amino acids have properties like molecular chirality and zwitter ionic nature helps to improve NLO properties of ADP. The pure and l-threonine doped ADP crystals are grown using slow solvent evaporation technique at room temperature. The Powder XRD spectra suggest tetragonal crystal system and slight shifting of peak. The FT-IR spectra verify the presence of various functional groups of pure and doped ADP crystals. The FT-Raman shows strong absorption peak at 922 cm−1 due to asymmetric stretching of PO4 3− for all samples without shifting indicating the single phase nature of all samples. The photoluminescence study suggests the presence of defects in doped samples compared to the pure one due to increase of Stokes shift and vibrational energy relaxation phenomena. The presences of constituent elements are indentified using CHN analysis. The optical transmittance, energy band gap, skin depth, refractive index and extinction coefficient is study using UV–Visible spectroscopy and the dispersive behaviour of refractive index below absorption edge is study using Wemple-DiDomenico single oscillator model. The variation of capacitance and conductance is study using complex admittance spectroscopy. All the grown crystals have possessed negative photoconductivity. The second and third harmonic generation efficiency is increased nearly to double for l-threonine doped ADP crystals compared to pure Potassium dihydrogen phosphate (KDP). The laser damage threshold is measure for pure and doped ADP crystals.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.005
       
  • Understanding the Adsorption of newly Benzylidene-aniline derivatives as a
           Corrosion Inhibitor for Carbon steel in Hydrochloric acid solution:
           Experimental, DFT and Molecular Dynamic Simulation Studies

    • Authors: M.E. Belghiti; S. Bouazama; S. Echihi; A. Mahsoune; A. Elmelouky; A. Dafali; K.M. Emran; B. Hammouti; M. Tabyaoui
      Abstract: Publication date: Available online 11 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): M.E. Belghiti, S. Bouazama, S. Echihi, A. Mahsoune, A. Elmelouky, A. Dafali, K.M. Emran, B. Hammouti, M. Tabyaoui
      Corrosion inhibition of carbon steel in hydrochloric acid solution was inspected using newly Benzylidene-aniline derivatives namely: (E)-N(2-Chlorobenzylidene)-2-Fluorobenzenamine (NCF) and (E)-N(2-Chlorobenzylidene)-3-Chloro-2-Methylbenzenamine (NCCM), by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The experimental results showed that both NCF and NCCM are good inhibitors for carbon steel in 1M HCl.The inhibition efficiency increases with inhibitors concentration rise, reaching a value up to 89.72% at 10-3 M for the inhibitor NCF. Electrochemical impedance data show a frequency distribution of the capacitance, simulated as constant phase element (CPE). Polarization curves study revealed that both inhibitors are mixed type. The adsorption on the carbon steel surface follows Langmuir isotherm model with negative values of Δ G ads 0 .Thermodynamics data for the adsorption process are calculated and discussed.The effect of molecular structure on inhibition efficiency was investigated by quantum chemical calculations using density function theory (DFT). Furthermore, Monte Carlo simulation technique incorporating molecular mechanics and molecular dynamic was applied to search for the best configurationally space for (NCCM or NCF)/100H2O/α-Fe2O3(111) systems. The results indicate that the adsorption energy of NCF was greater than NCCM which is in accordance with the experimentally determined inhibition efficiency.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.003
       
 
 
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