Surface properties of Gemini surfactants with pyrrolidinium head groups

被引:52
作者
Cai, Bo [1 ]
Li, Xuefeng [1 ]
Yang, Yi [1 ]
Dong, Jinfeng [1 ,2 ]
机构
[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
[2] Huazhong Normal Univ, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China
基金
中国国家自然科学基金;
关键词
Gemini surfactant; Heterocyclic head group; Pyrrolidinium; Micellization; Thermodynamics; ALKANEDIYL-ALPHA; OMEGA-BIS(DIMETHYLALKYLAMMONIUM BROMIDE) SURFACTANTS; AQUEOUS-SOLUTION; CATIONIC SURFACTANTS; BEHAVIOR; MICELLIZATION; ADSORPTION;
D O I
10.1016/j.jcis.2011.12.025
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
Gemini surfactants C-n-4-nPB (where n represents the alkyl chain length of 10, 12, 14 and 16) were synthesized and characterized. Their surface activity, thermodynamic properties, and aggregation behavior were investigated by means of surface tension, electrical conductivity, and steady-state fluorescence. It was found that the Gemini surfactants C-n-4-nPB have superior surface activity to their corresponding monomer surfactants CnMPB as expected. Additionally, these compounds have lower cmc and surface tension in comparison with conventional cationic Gemini surfactants m-4-m. Thermodynamic parameters (Delta G(m)(0), Delta H-m(0), T Delta S-m(0),) show that the micellization is an entropy driven process with shorter hydrophobic chain lengths but instead is enthalpy driven for longer hydrophobic chain lengths. The effect of the hydrophobic alkyl chain length and the addition of inorganic salt NaBr on the surface activity and micellization are in line with the conventional cationic Gemini surfactants. (C) 2011 Elsevier Inc. All rights reserved.
引用
收藏
页码:111 / 116
页数:6
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