Chromatographic characterization of surface-modified silica gels

1973 ◽  
Vol 87 (1) ◽  
pp. 35-48 ◽  
Author(s):  
Shubhender Kapila ◽  
Walter A. Aue ◽  
Joseph M. Augl
Keyword(s):  
Silica Gels ◽  
Modified Silica ◽  
Chromatographic Characterization ◽  
Surface Modified ◽  
Modified Silica Gels

Structural Characterization of Gels Prepared from Co-Hydrolysis of Tetraethoxysilane and Dimethyldiethoxysilane.

1992 ◽  
Vol 271 ◽  
Author(s):  
Florence Babonneau ◽  
Laurence Bois ◽  
Jacques Livage
Keyword(s):  
Structural Characterization ◽  
Silica Gels ◽  
Condensation Process ◽  
Modified Silica ◽  
Polymeric Gels ◽  
Organically Modified ◽  
Organically Modified Silica ◽  
Hydrolysis Of ◽  
Modified Silica Gels

ABSTRACTThis work is part of a more general study on the structural characterization of organically modified silica gels that are usually prepared from tetrafunctional, trifunctional and difunctional alkoxides. The systems that were investigated in this paper are gels prepared from co-hydrolysis of dimethyldiethoxysilane (DEDMS) and tetraethoxysilane (TEOS). The condensation process was followed by 29Si and 17O liquid NMR and shows clearly evidence for co-condensation reactions. Gels with various DEDMS/TEOS ratios were studied by 29Si and 1H MAS-NMR. The results are clearly correlated to the change in physical properties of the materials, from flexible polymeric gels at high DEDMS content to crosslinked brittle networks at low DEDMS content.

Stability analysis of Bacillus stearothermophilus L1 lipase immobilized on surface-modified silica gels

2004 ◽  
Vol 17 (2) ◽  
pp. 85-90 ◽  
Author(s):  
Sangpill Hwang ◽  
Kang-Taek Lee ◽  
Jin-Won Park ◽  
Byoung-Ryul Min ◽  
Seungjoo Haam ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Bacillus Stearothermophilus ◽  
Silica Gels ◽  
Modified Silica ◽  
Surface Modified ◽  
Modified Silica Gels

Surface-modified silica gels as solid stationary phases in gas chromatography

1997 ◽  
Vol 90 (1-2) ◽  
pp. 53-63 ◽  
Author(s):  
S. Faramawy ◽  
A.M. El-Fadly ◽  
A.Y. El-Naggar ◽  
A.M. Youssef
Keyword(s):  
Gas Chromatography ◽  
Stationary Phases ◽  
Silica Gels ◽  
Modified Silica ◽  
Surface Modified ◽  
Modified Silica Gels
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