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Preparation and characterization of methyl-modified hybrid silica membranes for gas separation.

Authors :
Yu Ma
Hye Ryeon Lee
Kaori Okahana
Masakoto Kanezashi
Tomohisa Yoshioka
Toshinori Tsuru
Source :
Desalination & Water Treatment; Jul2013, Vol. 51 Issue 25-27, p5149-5149, 1p
Publication Year :
2013

Abstract

The methyl-modified hybrid silica sols with methyltriethoxysilane and tetraethoxysilane were successfully prepared using alkaline (NH<subscript>3</subscript> and tetra-methyl-ammonium hydroxide (TMAH)) and acid catalysts (HCl and CH<subscript>3</subscript>COOH) and characterized with thermogravimetric analysis, Fourier transform infra-red, and water contact angle. The methyl-modified silica film showed hydrophobic property with water contact angles over 90° under alkaline or acid catalyst. The methyl-modified silica membranes were fabricated and evaluated with He, H<subscript>2</subscript>, N<subscript>2</subscript>, C<subscript>3</subscript>H<subscript>8</subscript>, and SF<subscript>6</subscript> at 200°C. He gas permeance for hybrid silica membranes was in the range of 0.61 - 1.91×10 <superscript>-6</superscript> molm <superscript>-2</superscript> s <superscript>-1</superscript> Pa <superscript>-1</superscript>, while He/SF<subscript>6</subscript> and N<subscript>2</subscript>/SF<subscript>6</subscript> permeance ratios of acid-catalyzed membranes was quite higher than those of alkaline catalyzed. Pore size (d<subscript>p</subscript>) of membranes were evaluated with normalized Knudsen-based permeance method, and the order of pore size for methyl-modified silica membranes can be estimated as follows: HCl-catalyzed membrane < acetic acid-catalyzed membrane < TMAH-catalyzed membrane < ammonium-catalyzed membrane. Judging from the order of pore size for methyl-modified silica membranes, the pore size of methyl-modified silica membranes can be tuned by controlling of catalyst during the sol-gel processing. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
19443994
Volume :
51
Issue :
25-27
Database :
Complementary Index
Journal :
Desalination & Water Treatment
Publication Type :
Academic Journal
Accession number :
92015541
Full Text :
https://doi.org/10.1080/19443994.2013.768409