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  Subjects -> CHEMISTRY (Total: 765 journals)
    - ANALYTICAL CHEMISTRY (45 journals)
    - CHEMISTRY (530 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (40 journals)
    - ORGANIC CHEMISTRY (40 journals)
    - PHYSICAL CHEMISTRY (63 journals)

CHEMISTRY (530 journals)                  1 2 3 4 5 6 | Last

2D Materials     Hybrid Journal  
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: 23)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 13)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 7)
ACS Macro Letters     Full-text available via subscription   (Followers: 16)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 24)
ACS Nano     Full-text available via subscription   (Followers: 214)
ACS Photonics     Full-text available via subscription   (Followers: 1)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 8)
Acta Chemica Iasi     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 5)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access   (Followers: 1)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 4)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 8)
Advanced Functional Materials     Hybrid Journal   (Followers: 31)
Advances in Chemical Engineering and Science     Open Access   (Followers: 21)
Advances in Chemical Science     Open Access   (Followers: 8)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 13)
Advances in Drug Research     Full-text available via subscription   (Followers: 16)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 12)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 11)
Advances in Nanoparticles     Open Access   (Followers: 10)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Polymer Science     Hybrid Journal   (Followers: 38)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 9)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 4)
African Journal of Chemical Education     Open Access   (Followers: 1)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 1)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access  
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alchemy     Open Access   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 4)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 123)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 11)
American Journal of Chemistry     Open Access   (Followers: 17)
American Journal of Plant Physiology     Open Access   (Followers: 9)
American Mineralogist     Full-text available via subscription   (Followers: 2)
Analyst     Full-text available via subscription   (Followers: 35)
Angewandte Chemie     Hybrid Journal   (Followers: 11)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 173)
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: 4)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 9)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 11)
Anti-Infective Agents     Hybrid Journal   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 4)
Applied Spectroscopy     Full-text available via subscription   (Followers: 12)
Applied Surface Science     Hybrid Journal   (Followers: 14)
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  
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 6)
Biochemistry     Full-text available via subscription   (Followers: 160)
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)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 1)
Biointerphases     Open Access  
Biomacromolecules     Full-text available via subscription   (Followers: 16)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 5)
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: 12)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 11)
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: 10)
Carbon     Hybrid Journal   (Followers: 34)
Catalysis for Sustainable Energy     Open Access   (Followers: 1)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 4)
Catalysis Science and Technology     Free   (Followers: 4)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 6)
Cellulose     Hybrid Journal   (Followers: 4)
Central European Journal of Chemistry     Hybrid Journal   (Followers: 5)

        1 2 3 4 5 6 | Last

Chemistry and Materials Research
   [11 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]
  • Enhancement efficiency of polymer solar cells by incorporating metal oxide
           nanoparticles

    • Authors: Abdullah A. Hussein, Waleed A. Hussain, Hussein F. Al-luaiby, Assel K. Hassan
      Abstract: Gold nanoparticles (AuNPs) deposited at the interface of the hole-collecting buffer layer [poly(3,4ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)] and regiore-gular poly (3-hexylthiophene) :[6,6]-phenylC61-butyricacidmethylester(rr-P3HT):(PCBM) active layer were found to significantly increase solar cell performance. The photo-physical properties of these devices incorporated with AuNPs with different space distributions in the interface of PEDOT:PSS buffer layer and P3HT:PCBM active layer are investigated. We find that, the optical property is improved as the AuNPs are large enough to penetrate into the active layer and the performance of Photovoltaic solar cells (PSCs) with large AuNPs can benefit from the improved hole collection efficiency. The efficiency enhancement for the device with a PEDOT:PSS: AuNPs film is more significant than for the device with PEDOT:PSS film. Keywords: PEDOT:PSS, Buffer layer, P3HT:PCBM, Gold oxide nanoparticle.
      Issue No: Vol. 6
       
  • In vitro antimicrobial activity of intercalated Modified Chitosan-Clay
           nanocomposite against different microorgamnisms

    • Authors: Rehab Abdeen
      Abstract: Unmodified sodium montmorillonite (Na-MMT) used to intercalate chitosan (CS) and modified chitosan. Their structures were characterized by XRD, TEM and IR techniques. The results showed that CS chains were inserted into silicate layers. The interlayer distance of the layered silicates in the nanocomposites enlarged as the amount of polymer increased. The thermal stability of the nanocomposites are characterized by TGA. In vitro antimicrobial assay showed that pristine montmorillonite could not inhibit the growth of bacteria. Chitosan was less effective in inhibiting bacterial growth than chitosan modified triphenyl phosphine ( mod- CS).  CS/MMT and mod-Cs/MMT nanocomposites had strong antimicrobial activity, particularly against Gram-positive bacteria. With the increase of the amount and the interlayer distance of the layered silicates in the nanocomposites, the nanocomposites showed a stronger antibacterial effect. Keywords: Chitosan; Nanocomposite; Antimicrobial
      Issue No: Vol. 6
       
  • Determination of New Isomer of Palmitoleic Acid in Mucuna Pruriens Seed
           Oil

    • Authors: A. Rastogi, A. K. Banerjee
      Abstract: Palmitoliec acid is an unsaturated fatty acid and it is very important in different essential enoic acid. Most of which are not synthesized by the body and are to be supplied through edibles. By the formation of DMOX derivative of FAME, allows the determination of deposition of the double bond in fatty acid carbon chain.This work is also important to quick and reproducible methods used to screen the utility of non conventional sources of oil for edible and industrial purposes. For the present investigation, non conventional source mucuna puriens (pepilionaceae) seed is used. Seeds have been reported to cure diarrhea and Parkinson’s disease. It is a natural source of L-dopa. Key w ords: FAME, DMOX derivative, palmitoleic acid
      Issue No: Vol. 6
       
  • Electrochemical DNA Hybridization Sensor Using Poly[vinylpyridine
           Os(bipyridine)2Cl]-co-Ethylamine Redox Polymer

    • Authors: Zahilis Mazzochette, Amos Mugweru
      Abstract: DNA hybridization sensors are important for diseases diagnosis. Until now, many approaches have been proposed for the DNA hybridization examination. These include fluorescence based, electrochemical and colorimetric based. Electrochemical hybridization for detection of DNA sequences requires the development of easy to-use, fast, inexpensive, miniaturized analytical devices. In this work, a simple electrochemical DNA hybridization sensor that uses poly[vinylpyridine Os(bipyridine)2Cl]-co-ethylamine redox polymer as the indicator was assembled. The electrochemical behavior of poly[vinylpyridine Os(bipyridine)2Cl]-co-ethylamine redox polymer polymer with both single stranded DNA (ssDNA-SH) probe and double stranded DNA (dsDNA) was determined. Both cyclic voltammetry and impedance spectroscopy results indicated strong binding of the new redox polymer onto DNA. A hybridization process involving a monolayer of a 24-mer thiol-tethered DNA capture probe on gold electrode and the corresponding complementary strand were clearly demonstrated. DNA double strand after disruption with free radicals could also be detected. The biosensor system has potential for use to recognize of damaged DNA sequences.     Keywords: Cyclic voltammetry; Hybridization; Poly[vinylpyridine Os(bipyridine)2Cl]-co-ethylamine.
      Issue No: Vol. 6
       
  • Pi-Conjugated Phosphole Derivatives: Promising Building Blocks for
           '-Conjugated Organic Materials

    • Authors: Isaac A. Adejoro, Babatunde T. Ogunyemi
      Abstract: Pi-Conjugated organophosphorus derivatives have recently emerged as valuable building blocks for the tailoring of functional molecular materials. In order to guide the synthesis of novels materials with low band gaps, theoretical study on the geometries and electronic properties of new conjugated compounds based on low coordinate heterophosphole compounds were carried out. The theoretical ground-state geometries and the electronic structures of the studied molecules were obtained using the density functional theory (DFT) method at B3LYP level with 6-31G(d) basis set. The effects of the phosphorus and different heteroatom elements on the geometries and electronic properties of these materials were discussed. The results from this study show that conjugated molecules containing phosphorus atom gives better electronic properties compared to their organic counterparts that had been used in optoelectronic devices. Hence these compounds could be a good promising building blocks candidate for opto-electronic applications. Keywords: Conjugated Compounds, Electronic Properties, Density Functional Theory, Opto-Electronic Device
      Issue No: Vol. 6
       
  • Improved pitting corrosion resistance of S.S 316L by Pulsed Current Gas
           Tungsten Arc Welding

    • Authors: I. Berenjani, A. Bakhtiari, K. Raeissi, M. Shamanian, A. Saatchi
      Abstract: In this study, S.S 316L was welded using Direct Current Gas Tungsten Arc Welding (DGTAW) and Pulsed Current Gas Tungsten Arc Welding (PGTAW) methods. Optical observations, scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) were employed to study the effect of continuous and pulse currents on microstructure and phase transformation in weld metal (WM). In addition pits morphology were evaluated by SEM. The corrosion behaviour was analyzed using cyclic polarizaton tests and Mott-schottky measurements. The pulse current resulted in finer grain and more ferrite in WM. This can be due to the decrease in heat input and higher cooling rate encouraged by pulse current. Cyclic potentiodynamic polarization tests showed that the WM of sample produced by pulse current show higher corrosion and pitting resistances than that in sample produced by continuous current. The reason is attributed to lower segregation of solute elements such as chromium and molybdenum into the delta-ferrite and also finer grain size produced in WM due to lower heat input and higher cooling rate. Both of these factors increase the stability of passive layer formed. The results showed that the corrosion behaviour of WM in both conditions (pulse and continuous current) is higher than the base metal (BM). This fact is attributed to the presence of ferrite bands formed in BM due to the segregation of alloy elements. The Mott-schottky plots confirmed that the passive layer formed on welded samples was an n-type semiconductor. The results showed that the samples showed less pitting resistance contained more oxygen vacancies in their passive film structure. It is also concluded that the breakdown of passive layer and pitting formation obey point defect model (PDM). Keywords: S.S 316L, Pulsed Current Gas Tungsten Arc Welding (PGTAW), lacy ferrite, vermicular ferrite, Pitting corrosion, Mott- Schottky.
      Issue No: Vol. 6
       
  • Enhancement Mechanical Properties of Carboxymethyle Cellulose by Adding
           Polyacrylamide using Ultrasonic Technique

    • Authors: Abdul-Kareem J. Al-Bermany, Foaad Sh. Hashim, Haider H. Jassim
      Abstract: The CMC/PAAM composite membranes were prepared by casting method, the appropriate weight of CMC was variable (0.2,0.3,0.4,0.5 and 0.6 gm) and dissolved in (25ml) of distilled water under stirring and heat (70'C) for (40 min.) then add the PAAM with different weights (0.05, 0.1  gm) for each CMC weight. In order to evaluate the mechanical properties of CMC/PAAM composite the ultrasonic measurements were performed at the samples , these properties are ultrasonic velocity, compressibility, acoustic impedance and bulk modulus, were made at fixed frequency (f =25 KHz), another acoustic mechanical properties were measured and calculated at a same time such as the ultrasonic wave amplitude absorption by composite were measured using oscilloscope ,then we calculated absorption coefficient and the transmittance ratio of the sound. It was found that there is significant relationship between ultrasonic velocity and material properties also results show that adding PAAM effects on the density then on the absorption of the ultrasonic waves inside the composites samples. Keywords: Carboxymethyle cellulose, Polyacrylamide , Mechanical properties, ultrasound technique.
      Issue No: Vol. 6
       
  • Phytochemical Characterization using GC-MS Analysis of Methanolic Extract
           of Moringa oleifera ( Family Moringaceae) Plant Cultivated in Iraq

    • Authors: Enas J. Kadhim, Duha A. AL-Shammaa
      Abstract: Objective: The aim of the present study was to characterize the Moringa oleifera plant cultivated in Iraq for the presence of biologically active phyto-chemicals using methanolic extracts of the plant (leaves and seeds)  . This study was determined by using Gas Chromatography –Mass spectrometry, while the mass spectra of the compounds found in the extract was matched with the National Institute of Standards and Technology (NIST) library. Methods: In the present investigation, methanolic extracts of Moringa oleifera were screened for the presence of steroids, alkaloids, tannins, flavonoids, terpenoids, anthraquinoin and cardiac glycosides  by standard qualitative test procedures and further this study was extended by analyzing the potent bioactive compounds in the methanolic extract of plant using GC-MS analysis. Results:  reveal the presence of different compounds (about 100 compound)  in the Moringa plant extract  among them alkaloids, terpenoids  steroids, saturated and unsaturated fatty acid, aromatic and aliphatic hydrocarbon, polyphenolic compounds . GC-MS was done using the database of National Institute of standard and Technology (NIST). Conclusion: Results confirmed the presence of therapeutically potent compounds in the Moringa extract predominantly steroids, flavonoids and terpenoids. Keywords: Moringa oleifera, biologically active, Phytochemicals, GC-MS analysis.
      Issue No: Vol. 6
       
  • Effect of Different Sources of Heat on Nutritional Composition of Tilapia
           Fish (Oreochromis niloticus)

    • Authors: M. O. Aremu, B. S. Namo, Y. Mohammed, C. S. Archibong, E. Ogah
      Abstract: A study was conducted to investigate the effect of traditional smoking methods on fresh tilapia fish (Oreochromis niloticus). For this purpose, proximate, mineral and amino acid compositions of tilapia fish smoked with sawdust, rice bran, melon husk and electric oven (control) heat treatments were determined using standard analytical technique. The results showed that crude protein content (%) ranged between 55.10 to 64.16% with the highest value recorded in sample smoked with rice bran heat treatment while crude fat had the highest value (18.10%) also in rice bran smoked sample. Sodium was found to be more abundant in all the samples (5.75 – 10.10 mg/100g) compared with magnesium (5.45 – 9.15 mg/100g), potassium (4.55 – 6.45 mg/100g) and phosphorus (4.70 – 6.00 mg/100g) while the least abundant mineral was chromium (0.05 – 0.15 mg/100g). The harmful metals such as cadmium and lead were not at detectable range of atomic absorption spectrophotometer (AAS). The amino acid profile revealed that only Oreochromis niloticus fish sample smoked with sawdust enhanced the contents of total amino acid (TAA), total essential amino acid (TEAA) and total sulphur amino acid (TSAA) by 3.77, 3.95 and 7.03%, respectively while melon husk and rice bran heat treatments reduced TAA, TEAA and TSAA. The limiting amino acid (LAA) for all the samples with different heat treatments was Ile except sample smoked with rice bran which has Val as LAA. Generally, all the smoked samples contained nutritionally useful quantities of total essential amino acids. Keywords: Oreochromis niloticus, agricultural wastes, smoke, proximate, amino acids.
      Issue No: Vol. 6
       
  • Analysis of Chemically Deposited Copper Sulphide Thin Films

    • Authors: Chizomam Usoh, Charity Okujagu
      Abstract: Thin films of Copper Sulphide (CuS) have been fabricated by chemical bath deposition (CBD) technique on glass substrates at room temperature .The structural, morphological and optical properties were investigated. The samples used for XRD and SEM studies were found to be amorphous for the as- deposited and annealed (573k). Film thickness was found to depend on molar concentration of complexing agent. Spectrophotometric analysis of the as- deposited films revealed  peak  values  of  96.30%, 52.97% and 76.09% respectively  for  absorbance, transmittance, and reflectance respectively. Average values of refractive index (n) ranged between 1.18 and 2.47.Optical band gap values for the films are in the range 2.30eV and 2.44eV. Films could find applications in devices for photovoltaic conversion of solar energy, as window coatings and gas sensors. Keywords: Copper sulphide, chemically deposited, band gap, thin film
      Issue No: Vol. 6
       
 
 
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