Preparation and properties of surface modified ceramic membranes. Part II. Gas and liquid permeabilities of 5 nm alumina membranes modified by a monolayer of bound polydimethylsiloxane (PDMS) silicon
详细信息 查看全文
- 作者：Leger ; Christian ; De L. Lira ; Helio ; Paterson ; Russell
- 关键词：Surface modification ; Silicone ; Ceramic membrane ; Gas permeation ; Liquid permeation ; Pervaporation
- 刊名：Journal of Membrane Science
- 出版年：1996
- 出版时间：October 30, 1996
- 年：1996
- 卷：120
- 期：1
- 页码：135-146
- 全文大小：791 K
文摘
A new way to prepare hydrophobic membranes is reported. Polydimethylsiloxane oil (and any other silicone oil molecules) was grafted onto a porous alumina membrane (or any hydroxylated ceramic or glass) by heating, to 180°C, producing a covalently grafted monolayer of silicone oil, chemically and thermally stable, unaffected by organic solvents but susceptible to alkali attack (as is the silicone oil itself). The membrane is totally impermeable to pure water, and organic solvents may be extracted from water mixtures by pervaporation. Very high permeation fluxes were obtained, suggesting possible use of these silicone/ceramic membranes in extraction of volatile organic compounds (VOCs). This simple modification can be applied to macroporous membranes increasing hydrophobicity without pore blocking.