for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> CHEMISTRY (Total: 838 journals)
    - ANALYTICAL CHEMISTRY (48 journals)
    - CHEMISTRY (587 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (46 journals)
    - PHYSICAL CHEMISTRY (68 journals)

CHEMISTRY (587 journals)                  1 2 3 4 5 6 | Last

2D Materials     Hybrid Journal   (Followers: 5)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 32)
ACS Catalysis     Full-text available via subscription   (Followers: 28)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 15)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 10)
ACS Macro Letters     Full-text available via subscription   (Followers: 20)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 25)
ACS Nano     Full-text available via subscription   (Followers: 201)
ACS Photonics     Full-text available via subscription   (Followers: 6)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 11)
Acta Chemica Iasi     Open Access  
Acta Chimica Sinica     Full-text available via subscription  
Acta Chimica Slovaca     Open Access   (Followers: 6)
Acta Chromatographica     Full-text available via subscription   (Followers: 10)
Acta Facultatis Medicae Naissensis     Open Access   (Followers: 1)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 4)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 5)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 11)
Advanced Functional Materials     Hybrid Journal   (Followers: 40)
Advanced Science Focus     Free   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 23)
Advances in Chemical Science     Open Access   (Followers: 9)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 15)
Advances in Drug Research     Full-text available via subscription   (Followers: 18)
Advances in Enzyme Research     Open Access  
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 13)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 16)
Advances in Nanoparticles     Open Access   (Followers: 12)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Polymer Science     Hybrid Journal   (Followers: 39)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 10)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
African Journal of Chemical Education     Open Access   (Followers: 1)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 5)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 1)
Alchemy     Open Access   (Followers: 3)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 5)
AMB Express     Open Access  
Ambix     Hybrid Journal   (Followers: 2)
American Journal of Applied Sciences     Open Access   (Followers: 30)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 81)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 12)
American Journal of Chemistry     Open Access   (Followers: 19)
American Journal of Plant Physiology     Open Access   (Followers: 10)
American Mineralogist     Full-text available via subscription   (Followers: 7)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 20)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 135)
Annales UMCS, Chemia     Open Access   (Followers: 2)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 1)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 2)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 6)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 11)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 11)
Anti-Infective Agents     Hybrid Journal   (Followers: 1)
Antiviral Chemistry and Chemotherapy     Full-text available via subscription  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 4)
Applied Spectroscopy     Full-text available via subscription   (Followers: 14)
Applied Surface Science     Hybrid Journal   (Followers: 23)
Arabian Journal of Chemistry     Full-text available via subscription   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 4)
Autophagy     Full-text available via subscription   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 6)
Biochemistry     Full-text available via subscription   (Followers: 141)
Biochemistry Insights     Open Access   (Followers: 4)
Biochemistry Research International     Open Access   (Followers: 4)
BioChip Journal     Hybrid Journal   (Followers: 1)
Bioinorganic Chemistry and Applications     Open Access   (Followers: 4)
Bioinspired Materials     Open Access  
Biointerface Research in Applied Chemistry     Open Access   (Followers: 1)
Biointerphases     Open Access  
Biomacromolecules     Full-text available via subscription   (Followers: 17)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 6)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 2)
BioNanoScience     Partially Free   (Followers: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 30)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 24)
Bioorganic Chemistry     Hybrid Journal   (Followers: 5)
Biopolymers     Hybrid Journal   (Followers: 14)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
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: 13)
C - Journal of Carbon Research     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Full-text available via subscription   (Followers: 6)
Canadian Mineralogist     Full-text available via subscription   (Followers: 1)
Carbohydrate Research     Hybrid Journal   (Followers: 11)
Carbon     Hybrid Journal   (Followers: 55)
Catalysis for Sustainable Energy     Open Access   (Followers: 2)

        1 2 3 4 5 6 | Last

Journal Cover   Chemistry and Materials Research
  [10 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2224-3224 - ISSN (Online) 2225-0956
   Published by International Institute for Science, Technology and Education (IISTE) Homepage  [30 journals]
  • Journal Cover Page

    • Authors: Journal Editor
      Abstract: Journal Cover Page
      Issue No: Vol. 7
       
  • Adsorption of Metal Ions from Carwash Wastewater by Phosphoric Acid
           Modified Clay: Kinetics and Thermodynamic Studies

    • Authors: Bassey Sam Enoh, Wetpan Christopher
      Abstract: The adsorption kinetics and the thermodynamic parameters for the removal of metal ions from carwash effluent using phosphoric acid modified clay were investigated in this study. Kinetic parameters were determined by analysing the modified second-order and intra-particle models. In the second order kinetics, Cd2+ had adsorption capacity qe of 7.5mg/g with the regression coefficients of linearization (R2) of 1.0 followed by Ni2+ with qe of 1.36mg/g with R2 of 0.949. For the intra-particle kinetics, Cd2+ had Kid of 1.0 with R2 of 0.959, while Pb2+ had Kid of 0.144 with R2 of 0.997. Adsorption generally increases with temperature and time. At 240minutes, all Cd2+ had been removed from solution, same at 50oC with trend of removal following the order Cd2+' Pb2+' Cr3+ 'Ni2+. 'Ho ranged from -1.4KJ/mol for Cr3+ to -6.0KJ/mol for Cd2+ indicating physical adsorption. 'So ranged from 12..7J/mol for Cd2+ to 100J/mol for Cr3+ while 'G were negative for all metal ions indicating that the adsorption was spontaneous and feasible. Keywords: Carwash wastewater, adsorption, phosphoric acid modified clay, kinetics and thermodynamics
      Issue No: Vol. 7
       
  • Synthesis , Characterization and Biological Studies of Some New Mixed
           Nickel(II) Complexes Containing Dithiocarbamate and 1,10-phenanthroline
           Ligands

    • Authors: Atared . F . Hassan
      Abstract: Complexes [Ni(dtc1)2(phen)] (I) , [Ni(dtc1)(phen)2]Cl (II) ,[Ni(dtc2)2(phen)] (III) ,[Ni(dtc2)(phen)2]Cl (IV) , [Ni(dtc1)(dtc2)(phen)] (V) and [Ni(dtc2)2(H2O)2], where  dtc1=Benzyl dithiocarbamate , dtc2 = p-chloro benzyl dithiocarbamate ,phen=1,10-phenanthroline were prepared by reaction of NiCl2.6H2O with different mole ratio of phenanthroline and dithiocarbamate Ligands.All complexes were characterized by C H N analyses , IR ,UV-Vis. , 1H NMR and XRD diffraction . The analytical data indicated that the dithiocarbamate ligands  and phen are coordinated  as bidentate ligands.The biological activities of these compounds shows that some promising activity against gram positive bacteria (Staphylococcus aureus ) and gram negative bacteria (Aeromonas Keywords :Mixed ligand ,dithiocarbamate ,phenanthroline , benzyl amine ,nickel Complexes.
      Issue No: Vol. 7
       
  • Comparative Study on the Addition of Cullet to Mowe and Ibamajo Clays for
           Ceramic Tiles Production

    • Authors: Olachi Nwannenna, Ayodele Ogunro, Friday Apeh
      Abstract: Waste broken glass known as cullet is one of the most common silicate wastes and has high volume in the urban wastes collection. Substantial amount of this wastes are being dumped in the city’s garbage deposits. In the last few decades, there has been considerable research on the reuse of glass wastes as aggregate to produce glass-ceramic, mortars, cement and concrete. This work studies the effect of waste glass (cullet) addition in the production of ceramic wall tiles using Mowe and Ibamajo clays in Ogun State, Nigeria. Pulverized waste glass was prepared by sieving using a 1.8mm mesh size in order to get the required samples that will be used for pressing the ceramic tiles. Ceramic bodies (CB) were pressed (5.08cm x 5.08cm) and (2.5cm x 2.5cm) using a ceramic mass with 0, 10, 20 and 30 % of cullet powder, respectively. These were cured; oven dried and fired between the temperature ranges of 800-1200ºC. The result of the linear shrinkage shows an increase in the linear shrinkage with increase in glass addition but this was still within the standard value.  The average compressive strength value of Mowe and Ibamajo was in accordance with the standards also (14.68N/mm2–28.61N/mm2).The study provides a base for the conversion of wastes to wealth, specially, the recycling of broken glass with the results obtained. Keywords: cullet, recycling, aggregates, ceramic bodies, wall tiles
      Issue No: Vol. 7
       
  • Compositions of Monomeric Sugars in Some Nigerian Hardwoods

    • Authors: Mayowa Akeem AZEEZ
      Abstract: Compositional analysis of monomeric sugars in carbohydrate fractions of 10 African angiosperms has been carried out using acid hydrolysis and high performance anion exchange chromatography with borate post column derivatization (HPAEC-Borate). The monomeric sugars in the wood stems were dominated by glucose, primarily from the cellulosic fraction of the biomasses. Xylose and small fractions of mannose constituted the main sugars from the hemicellulose fractions. The concentration of glucose peaked at 510 mg/g (dry sample) in Sterculiar rhinopetala, the lignocellulose with the least concentration of mannose among the samples. The ratio of the xylose to 4-O-methylglucuronic acid in Terminalia ivorensis suggested that this sample has more acidic xylan than Trilepsium madagascariensis, the sample with the richest xylan content (15 wt. %). The concentration of arabinose, rhamnose and galactose were mostly below 10 mg/g (dry sample) in all samples. The analysis of the non holocellulosic fractions of the samples revealed high lignin contents, which ranged 19.4 wt. % - 33.8 wt. % and high extractive contents, ranged between 1.8 wt. % and 11.0 wt. % (on dry basis). Keyword s:Biomass, Extractives, Hardwoods, Lignin, Monomeric sugar, Polysaccharide
      Issue No: Vol. 7
       
  • Effect of Al2O3 and SiO2 Nanopartical on Wear, Hardness and Impact
           behavior of Epoxy composites

    • Authors: Nadia. A.Ai, Seenaa I. Hussein, Mohammed K . Jawad, Ikram A. AL-Ajaj
      Abstract: A growing need for materials with good tribological and mechanical properties   led to prepare , characterize and measure wear, hardness and impact properties of epoxy (EP)  with different weight percentage of SiO2 and Al2O3 nano particles  (0.5%, 1%,1.5%,2%,2.5%,3%) . Silica and alumina nanoparticles have average diameter size 16.69 and 46.73 nm respectively measured by scanning probe microscope.A combination of two different techniques (high shear mixing followed by ultrasonication) was used to prepared the nanocomposites. Fourier transition infrared (FTIR) was used to characterize the nanoparticles (Al2O3 an SiO2) .Wear rate, hardness and impact energy properties  were measured for EP/ Al2O3, EP/ SiO2 nanocomposites . Decreasing in wear  values with addition of nanoparticles ( especially nano Al2O3) were observed. Approximately 30% and 80% increasing in hardness values and impact energy were observed. An enhancement in whole measurement for all composites was observed, yet (EP/ Al2O3, EP/ SiO2) composites with 2.5%nano Al2O3 show in general better hardness and impact results. Keywords: Nanoparticles, Nanocomposites, wear, Impact, hardness.
      Issue No: Vol. 7
       
  • Synthesis, Characterization, DNA binding and Microbial Activity of Cobalt
           

    • Authors: Rakesh K. Sahu, F. Khan, Kush Nayak
      Abstract: New Co(III) complexes of mixed ligands, hydroxamic acid (L1 = AHA (acetohydroxamic acid), L2 = BHA (benzohydroxamic acid) and L3 = OHA (oxalohydroxamic acid) and 1, 10-phenanthroline (phen) were synthesized and characterized by NMR, IR, UV-visible, mass spectrometer, and elemental analysis. In the complexes, [Co(phen)2L]ClO4 (L = L1, L2, L3), the metal ion is coordinated by six atoms, two oxygen atoms from hydroxamic acid and 4N atoms from co-ligand 1, 10-phenanthroline to form octahedral Co(III) complexes. The interaction of these complexes with calf thymus DNA (CT-DNA) has been investigated by absorption spectroscopy measurement. The DNA-binding constants for complexes 1, 2, 3 are 2.47 x 106 M-1, 4.02 x 106 M-1, 2.23 x 106 M-1 respectively. Detailed analysis shows that these complexes bind with DNA through interaction binding. And the study of microbial activity against Gram positive and Gram negative bacteria. Keywords: DNA binding, hydroxamic acid, cobalt complexes, 1, 10-phenanthroline, microbial activity.
      Issue No: Vol. 7
       
  • Synthesis, Characterization and Evaluation the Biological Activity of New
           Heterocycle Compounds Derived from 4-Aminoacetophenone

    • Authors: Nahidah A. Jinzeel
      Abstract: This research included the synthesis of new heterocycle compounds from 4-Aminoacetophenone as starting material via three deferent routs; the first one included the synthesis of N-Aacetophenone-1,2,3-triazole derivatives. At the second rout we prepared chalcones, which cyclized by reacting with thiourea and hydroxyl amine hydrochloride. The third rout included the reaction of starting material with 2-mercaptobenimidazole and 2-mercaptobenzthiozole. The structures of newly synthesized heterocyclic compounds established on the basis of their m.p, TLC, IR, UV-Vis, C.H.N. and 1H-NMR data. The results of antimicrobial activity of newly synthesized heterocyclic compounds showed that some of it have good antimicrobial activity when compared with standard antibiotic. Keywords: triazole, Chalcone, pyrimidine, oxazole, Antimicrobial activity.
      Issue No: Vol. 7
       
  • Synthesis and Characterization of 2-Ethoxy Isobutryl Acid Hydrazide and
           2-Ethoxy Isobutryl Aceto Hydrazone and Its Metal Complexes with Co(II),
           Ni(II) and Cu(II)

    • Authors: Olalekan W. Salawu, Ishaq S. Eneji, Esther.N. Iornumbe
      Abstract: Complexes of Co(II), Ni(II) and Cu(II) derived from 2-ethoxy isobutryl acid hydrazide (EIAH1) and 2-ethoxy isobutryl aceto hydrazone (EIAH2) have been synthesized and characterized by elemental analysis, FT-IR, molar conductance, UV – visible spectra, ESR, thermal analysis and magnetic susceptibility. The complexes are coloured, stable in air and exhibit coordination number of 4 or 6. Analytical data showed that all the complexes exhibited 1:2 (metal:ligand) ratio. The changes observed between the FT-IR and UV – visible spectra of the ligands and of the complexes allowed us to establish the coordination mode of the metal in complexes. Presence of coordinated water molecules in Co (II) and Ni (II) complexes is confirmed by TGA studies. The conductivity data show that all these complexes are non electrolytes. The solubility test on the ligands and its metal(II) complexes revealed their solubility in dimethylsulphoxide (DMSO). The ligands and metal complexes show a good activity against the bacteria; B. Subtilis, E.coli and S.aureus and fungi A.niger, A.flavus and C.albicans. The antimicrobial results also indicate that the metal complexes are better antimicrobial agents as compared to the ligands. Keywords: Synthesis, hydrazine, hydrazone, metal complexes, characterization
      Issue No: Vol. 7
       
  • Spectrophotometric Method for the Estimation of Meropenem in Pure and in
           Market Formulation Meronem

    • Authors: Ameen W. Qassim
      Abstract: Cost effective, sensitive, rapid and simple spectrophotometric method was described for the determination of Meropenem in pure form and in pharmaceutical formulations. The proposed methods were based on the formation of chelating complex between meropenem and gold ion (III). This method was applied for the determination of drug meropenem in pharmaceutical formulation meronem and enabled the determination of the selected drug in microgram quantities The colored species has an absorption maximum at 477 nm for MRP-Au(III) complex and obeys beer’s law in the concentration range 15-70 µg/mL of Meropenem. The molar absorptivity was 0.818 x10-3 and sandell’s sensitivity was 4.6883x10-7. The slope is 0.0022. The intercept of the equation of the regression line is -0.0009. The optimum experimental parameters for the reaction have been studied and the validity of the described procedure was assessed. Statistical analysis of the results has been carried out revealing high accuracy and good precision. The proposed method was successfully applied for the determination of Meropenem in pharmaceutical formulation. Keywords: Meropenem, chelating complex, Spectrophotometry.
      Issue No: Vol. 7
       
  • Iodometric Titration and Spectrophotometric Method for the Determination
           of Iodine in Salt Samples Commercially Available in Bahir Dar, North
           Western Ethiopia

    • Authors: Tadesse Mengistu Bediye, Girma Kibatu Berihe
      Abstract: Iodine deficiency disorders (IDD) are major public health problems in many parts of the world and universal salt iodization (USI) is the best strategy to prevent and control IDD in given Community. The determinations of iodine content of the salt samples were based on standard literature procedures. The iodine content of salt samples commercially available in the super markets of Bahir Dar City measured with SP65 Uv-Vis Spectrophotometric method were found to be in the ranges of 5.634±0.312 to 60.098±0.132 ppm for fine salt and 5.288±0.086 to 8.321±0.756 ppm for coarse salt and with Iodometric titration ranging from ND (not detected) to 60.477±2.122 ppm in fine salt and none in coarse salt. Of all the salt samples collected from Bahir Dar, 61.54 % (n = 8) were insufficiently iodated; 23.08 % (n = 3) were adequately iodated and 15.38 % (n = 2) were over-iodated. The quality of iodized salt in Bahir Dar city is not uniform and the universal salt iodization program in Ethiopia needs strict quality assurance measures at the stages of production, storage, import and retail levels for a successful and sustainable prevention of IDD. Keywords: iodine; iodized salt; Iodometric titration; Uv-Vis Spectrophotometry
      Issue No: Vol. 7
       
  • Determination of Phenol Content of Liquid Smoke of Palm Oil Shell:
           Characterizations by using of Gas Chromatography- Mass Spectra and Fourier
           Transformed Infra Red

    • Authors: Desi Ardilla, Tamrin ., Basuki Wirjosentono, Eddyanto ., M. Said Siregar
      Abstract: The determination of phenol content of liquid smoke of palm oil shell has been carried out by using Gas Chromatography-Mass Spectra and Fourier Transformed Infrared. Pyrolisis was performed in the furnice that covered by white cement with a temperature of 500oC, 700oC, and 900oC, without and with nitrogen gas inlet with velocity flow of 10 mL/sec. The obtanined liquid smoke of palm oil shell cured for 7 days and then centrifuged at 3800 rpm for 60 minutes. The filtrate was distilled at a temperature of 125oC for 60 minutes. Redestilated liquid smoke analyzed by means of Gas Chromatography Mass Spectra to determine the levels of phenol content. Based on the Gas Chromatography Mass Spectra chromatogram, liquid smoke produced in free air pyrolysis at temperature 500'C, 700oC, 900oC containing phenol 35.09%; 27.92% and 14.49%, respectively, and in the air controlled pyrolysis were 7.86%; 9.25%, and 22.28%, respectively. FT-IR spectra of all liquid smoke product confirmed the presences of phenol functional groups. Keywords: phenol, liquid smoke,  palm oil shell, gas chromatography
      Issue No: Vol. 7
       
  • Utilization of Natural Tannin Extract for Copper Corrosion Inhibitor in
           Hydrochloric Acid Solution

    • Authors: Resa Denasta Syarif, Suprihatin ., Prayoga Suryadarma
      Abstract: Inhibitor of copper corrosion in 1M hydrochloric acid (HCl) solution by utilizing natural tannin extracted from raw gambier (Uncaria gambier Roxb.), areca nut (Areca catechu) and mangosteen peel (Garcinia mangostana) was investigated. Tannin functional groups were detected by FTIR analysis, the effect of tannin source and tannin concentration in copper corrosion inhibition were investigated by weight loss method (gravimetric). The ability of the best inhibitors was derived from raw gambier-based solution with lowest corrosion rate of 37.06 mils per year (mpy), followed by areca nut 45.34 mpy and mangosteen peel 49.49 mpy. The best concentraction of inhibitor was 0.75% which gives highest activation energy value and good surface appearance of the copper plate. Keywords: copper, corrosion rate, corrosion inhibitor, raw gambier, areca nut, mangosteen peel  
      Issue No: Vol. 7
       
  • Distribution Behaviour of Polycyclic Aromatic Hydroarbons in Roadside Soil
           at Traffic Intercepts within Onitsha Metropolis, South-East Nigeria

    • Authors: IGWE J. C, UKAOGO. O.P, OBIKE.I. A, ETUSIM P. E
      Abstract: Polycyclic aromatic hydrocarbons (PAHs) pollution in roadside soil was conducted in a developing city environment of South-Eastern Nigeria during raining season to ascertain the contamination levels and their distribution behavior in soil. The concentration of polycyclic aromatic hydrocarbons was determined at nine locations of Onitsha city, 3m distances from roadside in soil covering all the major traffic intercepts within the city. The samples were extracted in acetone and dichloromethane (1:1) using soxhlet extraction. The total concentrations of 16 PAHs ranged from 14,260 to 14,289 µg/kg, with a mean of 14,276 µg/kg which were than the limit <10000 µg/kg set for PAHs in the soil and the seven possible carcinogenic PAHs accounted for 17.2 % of 16PAHs detected. Chrysene was the polycyclic aromatic hydrocarbons found in highest concentration at all the intercepts ranging between 4050 to 4053 µg/kg with the mean of 4052 µg/kg. Among different functional areas, the higher level of PAHs was found in Obosi junction (right) followed by Main market road junction (right). The composition of PAHs was characterized by the high molecular weight PAHs, among which fluoranthene, Indeno(1,2,3,-cd)Pyrene, Acenaphthene chrysene were most dominant components. A principal component analysis and PAHs isomeric ratios indicate that PAHs in Onitsha road soil mainly originated from combustion. The toxic assessment suggested that soil PAHs exposure is medium carcinogenic at present level. Keywords: polycyclic aromatic hydrocarbons, Gas chromatography, season, traffic density, pollutants, principal component analysis, samples, concentration, carcinogenic.
      Issue No: Vol. 7
       
  • Chemical Speciation Study of Ternary Complexes of Cu (II) with Succinic
           Acid Dihydrazide and Some Amino Acids in Aqueous Solution

    • Authors: Dunkana Negussa Kenie, A. Satyanarayana, P. Shyamala
      Abstract: Solution equilibrium studies on the systems of Cu (II) with succinic acid dihydrazide (SADH) as a primary ligand (L) and selected amino acids (X) as secondary ligand were investigated with a potentiometric titration technique. The formation constants of the complexes were determined at 30 ± 1°C and ionic strength 0.1 mol.dm -3NaCl. The formation constants determined, suggests the formation of mixed ligand complexes. The relative stabilities of the ternary complexes are compared with those of the corresponding binary complexes in terms of 'logK values. The stability constants were calculated by using MINIQUAD 75 computer program, and species distribution diagrams were produced using the HYSS computer program. Selection of the best fit chemical models was based on statistical parameters. Distribution diagram and plausible equilibria for the formation of the complex species are presented. Keywords : Stability Constant, Ternary Complex, Best Fit Model, 'log K
      Issue No: Vol. 7
       
  • Investigation of Optical Properties for (PVA-PEG-Ag) Polymer
           Nanocomposites Films

    • Authors: Bahaa H. Rabee, Fouad Z. Razooqi, Mohammad H. shinen
      Abstract: This paper investigates the effects of addition of Ag nanoparticles on optical properties of polyvinyl alcohol (PVA) and Polyethylene glycol(PEG-4000) blend. The samples of nanocomposites were prepared by adding Ag nanoparticles percentages of 0, 3, 6, 9 wt. % to the (PVA-PEG)blend. The films were prepared by casting method with different thicknesses. The absorption has been recorded in the wavelength range (200 - 1100) nm. The optical constants(absorption coefficient, extinction coefficient) energy gap of the indirect allowed and forbidden transition, real and imaginary dielectric constants have been determined. The optical constants are increase with increasing of silver nanoparticles concentration. The energy gap decreased with increasing theweight percentages of silver nanoparticle. Keywords: nanocomposites films, PVA-PEG-Ag, optical properties .
      Issue No: Vol. 7
       
  • Phase Equilibria and Thermodynamic Description of Alloys of
           8-Hydroxyquinoline – 4-Chlorobenzoic acid

    • Authors: H. SHEKHAR, S.S. SALIM
      Abstract: In present article 8-hydroxyquinoline (HQ)-4-chlorobenzoic acid (CBA) system has been undertaken to study phase diagram and thermodynamic contribution in the system in terms of partial and integral mixing and excess functions. The phase equilibria of the system under taken shows the formation of 1:1 addition compound C and its eutectic E at 214º and199º c respectively. The negative value of molar free energy of mixing ('GM) of alloys at 0.810 and 0.895 mole fraction of CBA suggests that the mixing in these cases is spontaneous. The integral molar enthalpy of mixing value corresponds to the value of excess integral molar free energy of the system favors the regularity in the binary solutions. The positive value of excess free energy (gE) for all the eutectic and noneutectic alloys suggests an association of weaker nature between unlike molecules and of stronger nature between like molecules. Gibbs-Duhem equation gives the graphical solution of partial molar heat of mixing('Hi -M), activity and activity coefficient of a particular constituent in the binary mix. Interfacial roughness of the binary alloys has also been explained. Keywords : Organic alloys, phase diagram, activity, activity coefficient, mixing  and excess function.  
      Issue No: Vol. 7
       
  • Synthesis and characterization of poly(hydroxylalkanethiol-ether)
           derivatives of Plukenetia conophora oil

    • Authors: Akintayo C.O, Akintayo E.T, Ziegler T, Beuermann S.
      Abstract: Biobased additives for metal working or industrial oils are desirable due to their eco-friendly nature.  In this work, 1-butanethiol, 1-decanethiol and I-octadecanethiol were employed to synthesize three useful poly(hydroxyalkanethio-ether) derivatives of Plukenetia conophora oil. The optimum experimental conditions of solvent, catalysts, time and temperature were investigated. The reactions were monitored and products confirmed by FTIR and NMR spectroscopy. The physico-chemical properties, polymer molecular weight and oxidative stability of the products were carried out to determine their end-use applications. Using perchloric acid as catalyst and a temperature of 500C, the reactions proceeded smoothly to the desired products after 3, 3.5 and 5hr for butylthio-ether, decylthio-ether and octadecylthio-ether derivatives of Plukenetia conophora oil respectively, while retaining the triglyceride structure of the oil. The resulting derivatives of Plukenetia conophora oil possess potentials for application in formulation of lubricants and industrial fluids. Keywords:Plukenetia conophora oil, polyhydroxylalkanethiol-ether, epoxy ring opening.
      Issue No: Vol. 7
       
  • Mixed Ligand Complexes of Cobalt (II) Barbitone in Aqueous Medium and
           their Biological Activities

    • Authors: S. A. Olagboye
      Abstract: Complexes of cobalt (II) barbitone and thiocyanate ion mixed ligands have been synthesized and characterized by a direct mixing method on the basis of their solubilities, melting points, elemental analyses as well as the spectroscopic analyses. Biological evaluations of the solid metal complexes and the free ligand were screened against the selected bacteria pathogens viz: Pseudomonas aeruginosa and bacillus subtitis and fungi species which include Sclerotiania trifoliorun, Fusarium oxyporium, Stemania paradoxa and Botrytis cinerea. The results of the metal complexes analyses have revealed that cobalt ions coordinated bidentately with the ligand through the ring carbonyl oxygen and nitrogen atom of the amide group, and also found to be soluble in ethanol and dimethylsulphuroxide and non-electrolytic in nature/character. The biological activities of metal complexes revealed that they were toxic to the selected fungi but not effective as antibacterial agents except in the mixed ligand metal complexes. However, complexes were more potent than the free ligand.   Keywords: Barbitone, mixed ligand, cobalt and biological activities.
      Issue No: Vol. 7
       
  • Synthesis new fused and non-fused chromene [I] derivatives derived from
           

    • Authors: Hamid H. Mohammed, Redha I.H. Al-bayati, Fatima attallah
      Abstract: A new series of pyrano-chromene and pyrimido pyrano-chromene derivatives were synthesized starting from 2-amino-4-[4-(dimethylamino)phenyl]-5-oxo-4H,5H-pyrano[3,2-c]chromene-3-carbonitrile (5). The structures of the synthesized compounds were elucidated by spectral data. Key words: Chromenes, Pyrano-chromenes
      Issue No: Vol. 7
       
  • Copper Catalysed N-Arylation of Angular Triazaphenothiazinone

    • Authors: Ihejieto Anthony Ikenna, Okoro Uchechukwu Chris, Jacob Alifa David
      Abstract: The copper catalyzed N-arylation of angular aminotriazaphenothiazinone is reported. This was achieved by the coupling of 11-amino-1,8,10-triazabenzo[a]phenothiazin-5-one with potassium or lithium aryltriolborate in the presence of a copper catalyst  for over 20h at room temperature to give the desired product. The success of this reaction lies in the preparation of the key intermediate, 11-amino-1, 8, 10-triazabenzo[a]phenothiazin-5-one synthesized by the condensation of 4, 5-diamino-6-thioprimidine with 7-chloro-5, 8-quinolinequinone in an anhydrous basic medium. Structures were assigned on the basis of spectral and analytical data.   Keywords: Aminotriazaphenothiazinone, triazabenzo[a]phenothiazinone, aryltriolborate, diaminothioprimidine.
      Issue No: Vol. 7
       
  • Investigation of Salvadora persica Roots Extract as Corrosion Inhibitor
           for Mild Steel in 1 M HCl and in Cooling Water

    • Authors: Ekhlas Qanber Jasim, Munther Abduljaleel Mohammed-Ali, Alaa Ali Hussain
      Abstract: Plant extracts have become important as an environmentally acceptable, readily available and renewable source for wide range of inhibitors. Therefore, inhibition of the corrosion of mild steel in hydrochloric acid solution and cooling water was carryout by the root extract of Miswak (Salvadora persica) has been studied using weight loss, electrochemical impedance spectroscopy and potentiodynamic polarization techniques. Inhibition was found to increase with increasing concentration of the extract. The effect of immersion time on the corrosion behavior of mild steel in 1 M HCl and cooling water with addition of extract was also studied. The adsorption of the extract on the mild steel surface obeyed the Langmuir adsorption isotherm. Values of inhibition efficiency calculated from weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) are in good agreement. Polarization curves showed that root extract behaves as a mixed-type inhibitor in both hydrochloric acid and cooling water. The adsorbed film on mild steel surface containing extract was also measured by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results obtained showed that the root extract could serve as effective inhibitor of the corrosion of mild steel in both hydrochloric acid media and cooling water media. Keywords: Miswak, Corrosion inhibitor, Cooling water, SEM and AFM.
      Issue No: Vol. 7
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2015