Covalent Attachment of Monochlorosilanes to Mesoporous Silica Membranes using Supercritical Fluid Deposition

Autor:	Carl P. Tripp, Scott Higgins, Douglas M. Ruthven, William J. DeSisto, Benjamin A. McCool
Rok vydání:	2008
Předmět:	chemistry.chemical_classification Chemistry Process Chemistry and Technology General Chemical Engineering Inorganic chemistry Filtration and Separation General Chemistry Permeance Mesoporous silica Supercritical fluid Catalysis Mesoporous organosilica Membrane Covalent bond Alkyl
Zdroj:	Separation Science and Technology. 43:4113-4128
ISSN:	1520-5754 0149-6395
Popis:	We have prepared and characterized organically-modified mesoporous silica membranes using supercritical CO2 fluid deposition. Supercritical CO2 fluid deposition has the potential to increase both diffusion and concentration of the reactants at the reaction site, a particular advantage when the reaction site is inside a small pore, where access can be limited. The unmodified mesoporous silica membranes were prepared by surfactant-templated synthesis on α-alumina disk-shaped supports. These mesoporous silica supports had a mean pore diameter of 5 nm. The alkyl modification of the silica membranes was achieved by the covalent attachment of octadecyldimethylchlorosilane (ODMCS) using triethylamine (TEA) as a catalyst in supercritical-CO2. Successful attachment was confirmed through infrared spectroscopic identification of the removal of the band due to isolated silanols accompanied by the appearance of bands due to methyl and methylene groups. We also directly measured a ∼90% reduction in permeance o...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::65fbde14e3bb77c8d1de7bf91c9ee311 https://doi.org/10.1080/01496390802414692 Zobrazit plný text záznamu