sol-gel silica matrix
Influence of calcination temperature on structural and magnetic properties of nanocomposites formed by Co-ferrite dispersed in sol-gel silica matrix using tetrakis(2-hydroxyethyl) orthosilicate as precursor
... routes, sol-gel process has proved to be an efficient method to prepare ultra-fine particles dispersed in different ...the sol-gel synthesis method has gone an intensive ...
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Sol Gel Silica Matrix as Reservoir for Controlled Release of Paracetamol: Characterization and Kinetic Analysis
... of silica were observed in all the samples, the band located around 477 cm −1 corresponds to Si-O-Si vibrations, while the peaks in the interval from 900 to 980 cm −1 are typical of the Si-OH bonds (Figure 1(a) ...
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Preparation and Structural Characterization of Sol-Gel-Derived Silver Silica Nanocomposite Powders
... of silica matrix caused by the presence of silver particles as a function of the annealing ...of silica were observed in the system heat-treated at 800 ...
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Sol Gel Processing of Silica Nuclear Waste Glasses
... The leaching data are difficult to compare directly with those of other studies, owing to variations of speci- men form and test conditions, but data from similar tests [20,27] indicate generally higher rates for the ...
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Friction and Wear Behaviors of Carbon Nanotube Reinforced Silica and Alumina Matrix Composites Fabricated by Catalyst Sol Gel and CVD Process
... The microstructures of CNT composite powders prepared through different catalyst sol-gels and CVD growing/calcin- ing processes are shown in Figs. 3–6. In T-1 specimen, many entangled CNTs were found (Fig. ...
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Synthesis and adsorption properties of chitosan silica nanocomposite prepared by sol gel method
... for the reactions of alkoxysilanes with hydroxyl groups of cellobiose [52]. Nevertheless, from the related cases, it is known that activation energy is necessary for the initiation of similar reactions [53]. Therefore, ...
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Synthesis and characterization of hybrid organic-inorganic materials based on sulphonated polyamideimide and silica
... and silica filler has been studied. The method allows the sol-gel process to proceed in the presence of a high molecular weight polyamideimide, resulting in well dispersed silica nanoparticles ...
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Immobilization of glucose oxidase/ferrocene carboxylic acid in composite silica sol-gel/cross-linked poly (vinyl alcohol)/nafion membrane
... In this work, immobilization of glucose oxidase and ferrocene carboxylic acid in SGS- CLPVA/Nafion has been performed. The immobilization technique resulted in an enzyme/mediator membrane that was simple to cast, ...
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Nanostructured Silica/Gold Cellulose Bonded Amino POSS Hybrid Composite via Sol Gel Process and Its Properties
... the sol-gel process is shown in ...the silica/gold formation, and the board peaks of 8°, 17°, and 21° for the regeneration of the cellulose-POSS ...the silica/gold nano-hybrid core/shell ...
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Surface Functionalization of Silica and Zirconia Sol-Gel Materials with Europium Complexes
... view sol-gel species functionalized with rare earth ions are hybrid materials as they contain an organic ligand or complex in an inorganic ...matrix. Sol- gel chemistry is the most ...
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Sol-gel sulphated silica as a catalyst for glycerol acetylation with acetic acid
... of silica and supported sulphate catalysts are shown in Table ...the silica matrix led to a continuous decrease of the surface area and pore volume, which might have been due to the pores blockage by ...
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PREPARATION AND CHARACTERIZATION OF MICROBIAL GLUCOAMYLASE IMMOBILIZED IN METHYLTRIETHOXYSILANE/TETRAETHOXYSILANE SOL-GEL MATRICES
... the sol-gel method, for the entrapment of microbial glucoamylase in a silica matrix, using methyltriethoxysilane (MTES) and tetraethoxysilane (TEOS) in different molar ratios, as gel ...
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Synthesis and Characterization of Silica-Nickel Nanocomposite through sol-gel route
... Abstract : The optimum combination of experimental variables- temperature, time of heat treatment under nitrogen atmosphere and amount of Ni-salt was delineated to find the maximum yield of nanophase Ni in the ...
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Wang, Bifeng (2017): Development of microparticles for sustained release of proteins based on lipid and silica materials. Dissertation, LMU München: Fakultät für Chemie und Pharmazie
... spherical silica particles were fabricated at moderate pH and prolonged chemical reaction, organic solvents or catalyzers were not ...the silica microparticles to the tailor release profile of a high ...
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Monoestolides Synthesis From Ricinoleic-Oleic Acids Using Silicotungstic Acid Sol-Gel Catalyst
... STA sol-gel is less well resolved than that of bulk STA ...the silica surface and the formation of an oxide of the type WO x as WO 2 in which W has an oxidation state lower than ...
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A Parametric Study of the Synthesis of Silica Nanoparticles via Sol-Gel Precipitation Method
... materials, silica has occupied a prominent position both in scientific researches and industrial applications because of its ease of preparation and wide range of uses ...of silica nanoparticles are crucial ...
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Complex Impedance Spectroscopy Study of Silica Nanoparticles Via Sol-Gel Method
... Fig. 4 shows FTIR spectra of the resulting silica nanoparticles at different molar ratios of ethanol. The band at ~469 cm -1 corresponds to Si-O rocking vibration where the oxygen atom moves perpendicular to the ...
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Synthesis of silica nanoparticles from Vietnamese rice husk by sol–gel method
... prepare silica nanoparti- ...the sol–gel method. The resulting silica particles were shown to be agglomer- ates with an average dimension of 15 to 91 ...the sol–gel technique ...
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Sol–gel dip coating of yttria-stabilized tetragonal zirconia dental ceramic by aluminosilicate nanocomposite as a novel technique to improve the bonding of veneering porcelain
... the silica and aluminosilicate coating, due to the sintering of silica content of porcelain and coating, while the newly formed interface between coating and Y-TZP remains the weakest zone of ...
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NEW MESOPOROUS MATERIALS WITH SURFACE SUPRAMOLECULAR CENTRES FOR METHYL RED SORPTION
... subsequent sol-gel condensation or postsynthetic modification of silica ...in sol-gel synthesis of the corresponding β-CD-containing silica ...
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