CTAB在硅胶表面吸附引起的润湿性变化和模拟驱油  

Wettability Changes by CTAB Adsorpt ion at Surfaces of SiO_2 Film or Silica Gel Powder and Mimic Oil Recovery

作　　者：毕只初[1] 廖文胜[1] 

机构地区：[1]中国科学院化学研究所,北京100080

出　　处：《物理化学学报》2002年第11期962-966,共5页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划资助项目(G1999022506)

摘　　要：用椭圆偏振法测定溴代十六烷基三甲胺(CTAB)水溶液在光滑的二氧化硅膜片上的吸附,其结果符合两阶段模型,即在不同浓度下发生单分子层和近似双分子层的吸附,并与其表面润湿性变化的数据吻合.用改进的Washburn方程测量改性硅胶粉末的润湿性,研究了CTAB水溶液在硅胶粉末表面上吸附引起的润湿性变化.并由此探讨了CTAB水溶液在硅胶粉末表面的润湿性,表面活性剂的临界胶束浓度(CMC)与表面含油粉末脱油率的关系,对在非超低界面张力条件下通过改变固/液界面润湿性提高原油采收率作了实验探讨.\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 steps model. Its monolayer and bilayer adsorption occurred at different concentrations. The adsorption is consistant with the wettability change of the film surface. The wettability of a silica gel powder was determined by a modified Washburn equation expressed as contact angles. The interfacial tension (gamma) between the 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 resident oil on the powder surface has been explored. It has been found that good residual oil could be achieved by surface wettability changes at normal interfacial tensions (10(0) similar to 10(2) m.N (.) m(-1)) and no formation of emulsion (see Table 4).

关 键 词：CTAB 硅胶 表面吸附 润湿性 模拟驱油 界面张力 模拟采油率 石油 化学驱油 表面活性剂 

分 类 号：O647.3[理学—物理化学]