V. M. Santhini; S.P.Suriyaraj;H. Bava Bakrudeen; M. Sugunalakshmi; S.P.Suriyaraj and H. Bava Bakrudeen
Abstract
In this study the Carvedilol drug-organo modified montmorillonite (CV/OMMT) nanocomposites were prepared using different organo modified MMT (Nanomer 1.31PS, Nanomer 1.34TCN, Nanomer 1.44P) through solution intercalation method. The degree of intercalation, microstructure and morphology of the nanocomposites ...
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In this study the Carvedilol drug-organo modified montmorillonite (CV/OMMT) nanocomposites were prepared using different organo modified MMT (Nanomer 1.31PS, Nanomer 1.34TCN, Nanomer 1.44P) through solution intercalation method. The degree of intercalation, microstructure and morphology of the nanocomposites were characterized by FTIR spectroscopy, thermogravimetric analysis and transmission electron microscopic analysis. The purpose of this study is to elaborate the drug loading capacities and drug release behaviours of different organo modified MMT (OMMT) on enhancing their swelling in aqueous medium. The in vitro drug release profiles from the CV/OMMT nanocomposites at pH 1.2 and pH 7.4 were also assessed. Simultaneously, the drug release kinetic parameters for all the CV/OMMT nanocomposites at both gastric and intestinal pH have also been discussed with established mathematical models.
Mallory Clites; Bryan W. Byles; Ekaterina Pomerantseva
Abstract
Bilayered vanadium oxide has emerged as a high-performance cathode material for beyond lithium ion (BLI) battery systems including Na-ion batteries, Mg-ion batteries, and pseudocapacitors. The major structural feature of bilayered V2O5 that makes it attractive for such applications is its large interlayer ...
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Bilayered vanadium oxide has emerged as a high-performance cathode material for beyond lithium ion (BLI) battery systems including Na-ion batteries, Mg-ion batteries, and pseudocapacitors. The major structural feature of bilayered V2O5 that makes it attractive for such applications is its large interlayer spacing of ~10-13 Å. This spacing can be controlled via the interlayer content, which can consist of varying amounts of structural water and/or inorganic ions, resulting in numerous chemical compositions. Further, bilayered V2O5 can be synthesized via a number of different methods, resulting in morphologies that include xerogel, aerogel, thin films, and 1-D nanostructures. The interlayer spacing, content, and material morphology can all affect the electrochemical performance of this materials family, and in this review, we discuss the role of each of these factors in the reversible cycling of charge-carrying ions beyond lithium. The different bilayered V2O5 synthesis methods and resulting compositions are reviewed, and important structure-property-performance insights into the reversible insertion/ extraction of larger/multivalent ions into the bilayered V2O5 structure are highlighted.
Peteris Lesnicenoks; Liga Grinberga; Laimonis Jekabsons; Andris Antuzevičš; Astrida Berzina; Maris Knite; Gatis Taurins; Šarūnas Varnagiris; Janis Kleperis
Abstract
Hydrogen storage is one of the main problems, to catalyse wide hydrogen use in transportation, technology and energetics. Composites involving nanostructured carbon species could be the solution for hydrogen storage problem because of their promising surface/volume relation. Not only catalysis and gas ...
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Hydrogen storage is one of the main problems, to catalyse wide hydrogen use in transportation, technology and energetics. Composites involving nanostructured carbon species could be the solution for hydrogen storage problem because of their promising surface/volume relation. Not only catalysis and gas sensing on graphene basis should be considered, but also metal decorated graphene structures for use in hydrogen storage should be an active field for research and development. Heat conductivity and large surface area of graphene-like materials can endorse research for hydrogen storage in low pressures and close to room temperature (RT) conditions - increasing possibility for RT-range devices in hydrogen energetics. For increased hydrogen storage investigations, we propose metal intercalated graphene structures, acquired during synthesis of graphene sheets. Intercalation, or decoration of graphene surfaces and edges have shown possibility to stabilize defects in graphene sheets. Graphene defects have shown to be sensitive against hydrogen gas and might as well prove themselves stable enough to achieve low pressure hydrogen storage. A simple method is proposed for synthesis of graphene sheet stacks (GSS). There is lack of research for synthesis of carbon nanomaterials from industrial graphite waste. Our research for stabilization of electrolyte solution and increased production amounts for hydrogen accepting samples continues.
S.R. Mane; P.S. Patil;P. N. Bhosale; R. M. Mane
Abstract
Thallium (I) doped tungsten heteropolyoxometalate (HPOM) combinatorial thin films have been deposited on glass substrate using simple chemical bath deposition technique. The deposited films were annealed at 100 o C, 150 o C, 200 o C and 250 o C. These annealed thin films were characterized by using SEM, ...
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Thallium (I) doped tungsten heteropolyoxometalate (HPOM) combinatorial thin films have been deposited on glass substrate using simple chemical bath deposition technique. The deposited films were annealed at 100 o C, 150 o C, 200 o C and 250 o C. These annealed thin films were characterized by using SEM, EDAX, AFM, FT-IR, XRD and TGA-DTA techniques for their structural properties. SEM and EDAX results shows that, tungsten HPOM material is polycrystalline in nature and Tl (I) is intercalated in phosphotungustate anion. AFM studies on the films annealed at different temperatures reveal that the surface roughness increases with the increase in annealing temperature, suggesting an increase of crystallization with temperature. FT-IR study confirms the well formation of heteropolyoxometalate material under investigation. Various structural parameters such as lattice constants, crystallite size and grain size have been calculated and they are found temperature dependent. The lattice constant, crystallite size and grain size of tungsten HPOM material increases with increase in temperature. XRD pattern of annealed thin films shows better crystanality of tungsten HPOM material having simple cubic spinel structure. The TGA-DTA study revealed that, Tl3 (PW12 O40) material is thermally stable up to 265.12 o C.
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