Wettability alteration by CTAB adsorption at surfaces Of SiO2 film or silica gel powder and mimic oil recovery

被引:61
作者
Bi, ZC [1 ]
Liao, WS [1 ]
Qi, LQ [1 ]
机构
[1] Chinese Acad Sci, Inst Chem, Key Lab Colloid & Interface Sci, Beijing 100080, Peoples R China
关键词
SiO2; film; silica gel powder; adsorption; Wettability; interfacial tension; thin oil film;
D O I
10.1016/S0169-4332(03)00948-6
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The adsorption of cetyl trimethylammonium bromide (CTAB) at a smooth surface of SiO2 film was determined by Ellipsometry. The result is in agreement with a two step model of the adsorption. Its monolayer and bilayer adsorption occurred at different concentrations of the CTAB aqueous solutions. The adsorption is consistent with the wettability change of the film surface. The wettability of the CTAB solutions on a silica gel powder was determined by a modified Washburn equation. The interfacial tension (gamma) between dodecane and the dilute CTAB aqueous solution was obtained using the pendant method. The relationship between the wettability of the powder surface, the critical micelle concentration (CMC) of CTAB and the mimic oil recovery of the residual oil on the powder surface has been explored. It has been found that good residual oil recovery can be achieved by the surface wettability changes at normal interfacial tensions (10(0)-10(2) mN m(-1)) and no formation of emulsion was observed. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:25 / 31
页数:7
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