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Citation: Bi Zhi-Chu, Liao Wen-Sheng. Wettability Changes by CTAB Adsorption at Surfaces of SiO2 Film or Silica Gel Powder and Mimic Oil Recovery[J]. Acta Physico-Chimica Sinica, ;2002, 18(11): 962-966. doi: 10.3866/PKU.WHXB20021101 shu

Wettability Changes by CTAB Adsorption at Surfaces of SiO2 Film or Silica Gel Powder and Mimic Oil Recovery

1.
Institute of Chemistry, Chinese Academy of Sciences, Beijing　100080

Received Date: 31 December 2001
Available Online: 15 November 2002

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 (γ) 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 od residual oil could be achieved by surface wettability changes at normal interfacial tensions (100～102 mN•m－1) and no formation of emulsion (see Table 4).
- Adsorption;Wettability;Interfacial tension;Mimic oil recovery
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