Surface properties and adsorption breakthrough curves of plasma-treated silica gels

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题名:	Surface properties and adsorption breakthrough curves of plasma-treated silica gels
作者:	Tao WH Chang KS Chung TW Chang YN
贡献者:	材料所
关键词:	adsorption silica gel plasma breakthrough curve contact angle BET surface area
日期:	2004
上传时间:	2009-11-27 11:15:55 (UTC+8)
摘要:	Plasma treatments are used widely in surface modification of thin films and membranes. A similar treatment method was used for granular silica gel by using both argon and oxygen plasma. The surface properties, such as contact angle of water, pore diameter, and BET surface area, and the adsorption breakthrough curves for water were obtained on the plasma-treated silica gel. The contact angle of water decreased rapidly and then remained approximately constant during the plasma treatment. This indicated that argon- or oxygen-plasma treatment made the silica gel surface more hydrophilic. The increase in BET surface area of the plasma-treated silica gels was 13 to 15%. The experimental breakthrough curves showed that modification not only increased the effective surface area and active sites but also reduced the mass transfer resistance. The time for breakthrough increased by about 4 minutes when either argon- or oxygen-plasma treated silica gels were compared to the untreated one. The amount of moisture adsorbed by the modified silica gel as calculated from the breakthrough curve was increased by 18% compared to the untreated sample.
關聯:	CHEMICAL ENGINEERING COMMUNICATIONS Volume: 191 Issue: 5 Pages: 682-693
显示于类别:	[化學工程與材料工程學系暨碩士班] 期刊論文

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