E. Vyhmeister, H. Valdés-González, A. Muscat
Mar 22, 2013
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0
Influential Citations
13
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Journal
Industrial & Engineering Chemistry Research
Abstract
Dimethyldichlorosilane (DMDCS), diethyldichlorosilane (DEDCS), and dibutyldichlorosilane (DBDCS) were dissolved in supercritical CO2 at two concentration levels to modify hydrolyzed porous surfaces via silylation reactions. Plasma-damaged methylsilsesquioxane samples were loaded in a batch reactor with the chlorosilanes; when introduced, the low-viscosity supercritical CO2 dissolved and transported the chlorosilanes to the porous surface. Samples were characterized using Fourier transform infrared spectroscopy (FTIR), ellipsometry, goniometry, and electrical measurements, and compared against untreated samples. Reactions between the chlorosilanes and substrate hydroxyls were strongly dependent on the length of the alkyl group on the chlorosilane, but independent of concentration. FTIR analyses showed a decreased intensity for infrared (IR)-isolated/geminal OH vibrations (100%, 93.9% ± 5.4%, and 95.4% ± 4.3% for DMDCS, DEDCS, and DBDCS, respectively), but DEDCS and DBDCS resulted in 3.9% ± 5.0% and 20.9% ±...