Solvent effect on the aggregate of fluorinated gemini surfactant at silica surface

被引:12
作者
Song, Xiaoyan
Li, Peixun
Wang, Yilin [1 ]
Dong, Chuchuan
Thomas, Robert K.
机构
[1] Chinese Acad Sci, Inst Chem, Key Lab Colloid & Interface Sci, Beijing 100080, Peoples R China
[2] Univ Oxford, Phys & Theoret Chem Lab, Phys Chem Lab, Oxford OX1 3QZ, England
基金
中国国家自然科学基金;
关键词
fluorinated gemini surfactants; surfactant adsorption; silica surface; organic solvent effect;
D O I
10.1016/j.jcis.2006.08.045
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 aggregate states of partially fluorinated gemini surfactant [(CF3)(2)CF(CF2)(2)(CH2)(10)N(CH3)(2)](2)(CH2)(6)Br-2 ((C5C10)-C-F-C-6-C10C5F) on silica surface were investigated with atomic force microscopy (AFM) and water contact angle (CA) measurement by analyzing the effects of bulk concentration and adsorption time on stack state. On surfactan t- adsorbed silica surfaces, there was a flat surface layer interspersed with some scattering surfactant aggregates. In the case of short adsorption times, the aggregates would be hemisphere. In the case of Ion-, adsorption times, the aggregates would be present in the form of bilayers. With the increase of bulk concentration, the adsorbed amount was enlarged and the surface layer became more compact. The formation of patchy bilayer aggregates indicated the saturation of the surface layer. Furthermore, organic solvent effects on the aggregate state of the surfactant on a silica surface were studied with four organic solvents, including n-hexane, dehydrated ethanol, 1, 1,2-trichloro- 1,2,2-trifluoroethane, and toluene. With the treatment of different organic solvents, the hemisphere aggregates on the surface layer can rearrange into spherical bilayer, rodlike monolayer, and branched rodlike monolayer aggregates, respectively. The polarity of solvents and affinity of organic solvents for surfactant molecules may have a great impact on the stack state of the fluorinated gemini surfactant molecules. (c) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码:37 / 44
页数:8
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