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Effect of Short Chain Alcohols upon Viscosity of TTAB Solution
Yun-fei Yan,Hua-zhen Li,Hai-yang Yang*,Jia-sheng Qian,Ping-ping Zhu,Ping-sheng He
Author NameAffiliationE-mail
Yun-fei Yan Department of Polymer Science & Engineering, University of Science & Technology of China, Hefei 230026, China  
Hua-zhen Li Department of Polymer Science & Engineering, University of Science & Technology of China, Hefei 230026, China  
Hai-yang Yang* Department of Polymer Science & Engineering, University of Science & Technology of China, Hefei 230026, China yhy@ustc.edu.cn, 
Jia-sheng Qian Department of Polymer Science & Engineering, University of Science & Technology of China, Hefei 230026, China  
Ping-ping Zhu Department of Polymer Science & Engineering, University of Science & Technology of China, Hefei 230026, China  
Ping-sheng He Department of Polymer Science & Engineering, University of Science & Technology of China, Hefei 230026, China  
Abstract:
The effect of ethanol (C2H5OH), propanol (C3H7OH), and butanol (C4H9OH) upon the viscosity of tetradecyltrimethylammonium bromide (TTAB) solution in the presence or absence of KBr at 30 o C was investigated, where the surfactant concentration CS is kept constant. In the absence of KBr, the relative viscosity ηr of TTAB solution increases linearly with the alcohol concentration CA, indicating that the alcohols do not promote micelle formation of TTAB. In the presence of KBr, ′r linearly decreases with CA for C2H5OH, but it exhibits a maximum with increasing CA for C3H7OH or C4H9OH. The facts reveal that C2H5OH or C4H9OH promotes the micelle formation of TTAB. A possible explanation is that the hydrophobicity of the micellar interior is enhanced by KBr, so that C2H5OH or C4H9OH can dissolve in micelle and promotes micelle formation. In the presence of KCl, which is less efficient in promoting the micelle formation of cationic surfactant, both C3H7OH and C4H9OH have only a slight effect on the micelle formation. In contrast, due to the hydrophilicity, C2H5OH cannot dissolve in micelles in the presence of KBr or KCl.
Key words:  Relative viscosity, Cationic surfactant, Organic additives, Hydrophobic interaction
FundProject:省自然科学基金No.050440906
Effect of Short Chain Alcohols upon Viscosity of TTAB Solution
严云飞,李化真,杨海洋*,钱家盛,朱平平,何平笙
摘要:
研究了不同条件下乙醇、丙醇和丁醇对十四烷基三甲基溴化铵(TTAB)溶液粘度行为的影响. 结果表明, 在无KBr存在下,TTAB溶液相对粘度随着醇的加入线性增加,说明醇分子没有增溶到TTAB胶束之中;在KBr存在下,TTAB溶液相对粘度随着乙醇的加入不断减小,但是会随着丙醇和丁醇的加入出现最大值,说明丙醇和丁醇的加入会促进TTAB胶束的增长;在KCl存在下,丙醇和丁醇的加入对TTAB胶束的影响几乎可以忽略不计.一种可能的解释是:KBr的存在促进了TTAB胶束的增长.因此,TTAB胶束内核的疏水程度有所增加,导致在特定浓度条件下丙醇和丁醇溶解到胶束中进一步促进了TTAB胶束的增长.
关键词:  相对粘度,阳离子表面活性剂,短链醇,疏水相互作用
DOI:10.1088/1674-0068/21/02/169-173
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