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Showing 1 to 14 of 14 for “"silica sol-gel"”.
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Molecular growth pathways in silica sol-gel polymerization
… developed to determine the structures of the polysilicate intermediates formed during silica sol-gel polymerization. This protocol allowed the structural identification of mono- through hexasilicate species (1<x<6 in [SixOy]9OCH3)a) formed during partial hydrolysis and condensation of …
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Fabrication of Random Hole Optical Fiber Preforms by Silica Sol-Gel Processing
Conventional fibers are comprised of a solid glass core and solid glass cladding often protected by a thin polymer sheath. The finely tuned difference in refractive indices, for step index-fibers, is achieved by doping the core with germanium or elements with similar effects. Holey fibers …
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Mesoporous organosilica materials with amine functions : surface characteristics and chirality
In this work mesoporous organisilica materials are synthesized through the silica sol-gel process. For this a new class of precursors which are also surfactant are synthesized and self-assembled. This leads to a high surface area functionality which is analysized with copper (II) and water …
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Studies Directed to the Development of Long Lived Palladium Membranes for Hydrogen Purification
… surface treatments were studied. The effect of silica as a diffusion barrier, surface pore modifier, and palladium nucleation site was examined. Silica sol-gel coating treated stainless steel substrates were explored. Several different formulas of sol-gel coatings and their impact on palladium …
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Studies Directed to the Development of Long Lived Palladium Membranes for Hydrogen Purification
… surface treatments were studied. The effect of silica as a diffusion barrier, surface pore modifier, and palladium nucleation site was examined. Silica sol-gel coating treated stainless steel substrates were explored. Several different formulas of sol-gel coatings and their impact on palladium …
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Studies of the Preparations and Use of Sol-Gel for Enzyme Immobilization and Analytical Applications.
… Glucose oxidase entrapment in different kinds of silica sol-gel matrices was investigated. The enzyme showed stable activity for 11 uses in the sol-gel with tetramethyl orthosilicate (TMOS) as precursor, and at least 7 uses in the sol-gel induced electrochemically with tetraethyl orthosilicate …
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The sol-gel synthesis of anti-stokes luminescent glass materials
… of the findings outlined below. The synthesis of silica based glasses using sol-gel techniques is covered thoroughly in this work and the incorporation of various cations into these matrices has been investigated. Amongst the cations added to silica sol-gel reactions are titania, alumina and …
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Light conversion processes in lanthanide-based molecular materials
… complexes and ii) lanthanide-doped sol-gel glasses as NIR-emissive optical materials. Heterometallic assemblies, containing two or more different lanthanide cations as carriers of distinctive functionalities, represent promising materials where different physical properties can …
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Development of novel lanthanide based particle tracers for rapid monitoring of soil erosion.
… based upon a lanthanide chelate complex-doped silica particle. The luminescent lanthanide chelate complexes were comprised of 2-thenoyltrifluoroacetone (TTA) and 2-pyridinol-1-oxide (2PO), coordinated with either trivalent europium or terbium ions. These complexes were then doped into silica …
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Nonlinear Photonics in Waveguides for Telecommunications
… low power wavelength converters. Second, a silica/electro-optic (EO) polymer phase modulator with an embedded bowtie antenna is proposed for use as a microwave radiation receiver. The detection of high-frequency electromagnetic fields has been heavily studied for wireless data transfer. …
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Effects of Dip-coated films on the Properties of Implantable Intracortical Microelectrodes
… bodies. We first present an examination of silica sol-gel thin films as a potential biomolecule delivery platform which does not adversely affect the electrical properties of ICMs. The second study shows that adsorbed proteins, thought to play an important role in modulating the RTR, cause …
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Funktionalisierte Alkylmethacrylat-Blockcopolymere als Template zur Darstellung geordneter Silica-Strukturen
… als Template für die Darstellung geordneter Silica-Strukturen über Sol-Gel-Reaktionen von Alkoxysilanen wurde angestrebt. Es wurde das Diblockcopolymersystem Poly(pentylmetacrylat-b-methylmethacrylat) PPMA-b-PMMA untersucht. Dieses wurde nach dem Mechanismus der anionischen Polymerisation …