Effect of surface geometric structure on the adhesion force between silica particles
Article Abstract:
Atomic force microscopy was used in measuring the adhesion between porous and nonporous silica particles as a function of relative humidity. The silica particles have been hydrothermally treated in the gas and liquid phases to control the pore size distribution. Gas adsorption was used in investigating geometric structure while silanol density was utilized in examining rehydroxylation. Results show the hydrothermal process resulted in coalescence and rehydroxylation with altering the surface geometry. The use of an autoclave led to sintering of the silica surface with crystallization.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Tailoring surface and structural properties of MCM-41 silicas by bonding organosilanes
Article Abstract:
Large pore MCM-41 silica was modified by chemically bonding organosilanes with various sizes and functionalities. By selecting proper ligands used for modification, It was found that the pore diameter and surface features of organic-modified ordered mesoporous materials (OMMs) can be systematically altered. Nitrogen adsorption measurements were observed to be appropriate for characterization of both surface and structural properties of modified and unmodified OMMs.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Ab initio study of the adducts of small molecules with the isolated hydroxyl of silica and the Bronsted site in zeolites: a comparison between B3-LYP and MP2 methods
Article Abstract:
B3-LYP methods were used to analyze the adducts of small molecules for the isolated hydroxyl of silica and the Bronsted site in zeolites. The molecules included H2O, CO and H2O. Results showed that B3-LYP offered results similar to MP2 testing, although B3-LYP required a larger dependence basis. The test also indicated less acidity for SIL compared to the isolated hydroxyl of silica.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
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