Reactions of Organosilanes with Silica Surfaces in Carbon Dioxide
作者： Chuntao Cao , Alexander Y. Fadeev , Thomas J. McCarthy
DOI: 10.1021/LA000849T
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摘要: Silylation reactions using liquid and supercritical CO2 as the solvent were performed on both single surface (silicon wafers) nanoporous (silica gel) silica samples. The alkylsilyl monolayers formed surfaces characterized by wettability, ellipsometry, X-ray photoelectron spectroscopy. Modified samples analyzed chemical analysis. A range of different silanes including monochloro-, dichloro-, trichloro-, dimethylamino-silanes was examined. results indicate that dense carbon dioxide is a good for silylation reactions, comparable or better than most solvents. Compared with optimum conditions at solid−liquid interfaces, in are faster, although maximum bonding densities slightly lower.
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