Results 261 to 270 of about 211,621 (304)
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Chemical modification of silica gels
Journal of Sol-Gel Science and Technology, 1997Highly porous pure and polyethyleneglycol (PEG)-doped silica gels have been prepared from tetraethyl orthosilicate (TEOS) in ethanol using NH4OH base-catalysis. Addition of PEG to the SiO2-systemincreases the average particle size and most frequent pore diameter of the resultant gels while their total surface areadecreases.
M.S.W. Vong, N. Bazin, P.A. Sermon
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Adhesion of Gels by Silica Particle
The Journal of Physical Chemistry B, 2014In this study, a method for achieving adhesion between two positively charged gels with high mechanical strength was developed. By utilizing a silica particle dispersion as a binder, the gels easily adhered to each other and remained stable for up to 11 days when immersed in aqueous solution.
Abe, H. +3 more
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Journal of Chromatography A, 2012
The retention properties of a silica gel column and a type C silica (silicon hydride) column for bases, sugars and polar acids were compared in hydrophilic interaction chromatography (HILIC) mode with formic acid or ammonium acetate as aqueous phase modifiers.
Bawazeer, Saud +4 more
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The retention properties of a silica gel column and a type C silica (silicon hydride) column for bases, sugars and polar acids were compared in hydrophilic interaction chromatography (HILIC) mode with formic acid or ammonium acetate as aqueous phase modifiers.
Bawazeer, Saud +4 more
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Annual Review of Materials Research, 1990
Sol-gel techniques can be used to produce two new types of optical silicas, termed Type V for the full density material and Type VI for the optically transparent porous material. This paper summarizes the processing differences between these six types of commercial silicas.
L L Hench, W Vasconcelos
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Sol-gel techniques can be used to produce two new types of optical silicas, termed Type V for the full density material and Type VI for the optically transparent porous material. This paper summarizes the processing differences between these six types of commercial silicas.
L L Hench, W Vasconcelos
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Zone electrophoresis in silica gel and silica paste
Biochimica et Biophysica Acta, 1960Abstract Silica gel and silica paste have been used as anticonvection media in zone electrophoresis. Rapid methods for preparing gels and pastes containing the appropriate electrophoretic buffer, and their use in zone electrophoresis, are given.
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Journal of Non-Crystalline Solids, 1988
Abstract The elastic modulus, modulus of rupture (MOR), and viscosity of wet silica gels were measured as functions of age of the gels, using a beam-bending method. The gels were prepared by acid-catalyzed hydrolysis of tetraethyl orthosilicate (TEOS) with a water/TEOS ratio of 16/1.
George W. Scherer +2 more
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Abstract The elastic modulus, modulus of rupture (MOR), and viscosity of wet silica gels were measured as functions of age of the gels, using a beam-bending method. The gels were prepared by acid-catalyzed hydrolysis of tetraethyl orthosilicate (TEOS) with a water/TEOS ratio of 16/1.
George W. Scherer +2 more
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Transcyclopalladation on silica gel
Polyhedron, 2013Abstract A possibility of transcyclopalladation on silica gel was shown using reactions of acetato- and chloro-bridged dimeric cyclopalladated complexes derived from N,N-dimethylbenzylamine with benzyl methyl sulfide, benzyl phenyl sulfide, benzyldiphenylphosphine, 8-methylquinoline and 1,3-bis(methylthiomethyl)benzene in the presence of equimolar ...
Jessica R. Lamb +2 more
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SPIE Proceedings, 1988
Gel Silica WaveguidesR.V. Ramaswamy, Taipau Chia *, R. Srivastava, A. Miliou and J. West*University of Florida, Department of Electrical EngineeringGainesville, Florida 32611*University of Florida, Department of Material Science and EngineeringGainesville, Florida 32611ABSTRACTWe report the first observation of modification of the surface- refractive ...
R. V. Ramaswamy +4 more
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Gel Silica WaveguidesR.V. Ramaswamy, Taipau Chia *, R. Srivastava, A. Miliou and J. West*University of Florida, Department of Electrical EngineeringGainesville, Florida 32611*University of Florida, Department of Material Science and EngineeringGainesville, Florida 32611ABSTRACTWe report the first observation of modification of the surface- refractive ...
R. V. Ramaswamy +4 more
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SPIE Proceedings, 1988
The processing and properties of Types I and II fused quartz optics and Types III and IV synthetic fused silica optics are compared with new organometallic sol-gel derived (Types V and VI) gel-silica optics. Type V gel-silica has excellent transmission from 165 nm to 4200 nm with no OH absorption peaks.
L. L. Hench, S. H. Wang, J. L. Nogues
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The processing and properties of Types I and II fused quartz optics and Types III and IV synthetic fused silica optics are compared with new organometallic sol-gel derived (Types V and VI) gel-silica optics. Type V gel-silica has excellent transmission from 165 nm to 4200 nm with no OH absorption peaks.
L. L. Hench, S. H. Wang, J. L. Nogues
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MRS Proceedings, 1988
ABSTRACTThe driving force for syneresis is generally attributed to the same chemical reactions that produce gelation, but it has also been proposed that shrinkage could be driven by interracial energy. The latter possibility is explored and discounted. The kinetics of syneresis depend on the driving force, the mobility of the gel network, and the rate ...
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ABSTRACTThe driving force for syneresis is generally attributed to the same chemical reactions that produce gelation, but it has also been proposed that shrinkage could be driven by interracial energy. The latter possibility is explored and discounted. The kinetics of syneresis depend on the driving force, the mobility of the gel network, and the rate ...
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