Tween20/40的CMC测定及NaCl的影响

摘要以高浓度碘的水溶液作为显色剂，用紫外吸收分光光谱法测定非离子表面活性剂Tween20和Tween40的临界胶束浓度（CMC）分别为519×10-5 mol/L和190×10-5 mol/L，再采用黏度法测定这2种表面活性的CMC分别为500×10-5 mol/L和193×10-5 mol/L，并研究了不同浓度的NaCl溶液对临界胶束浓度和黏度的影响。结果表明黏度法的测定结果与文献基本接近。当体系中存在NaCl溶液时，CMC值基本无变化，而溶液的相对黏度随着盐的浓度增大呈下降趋势。当NaCl为定值时，体系的相对黏度呈现先增加，在CMC之后，体系黏度基本保持不变。关键词：分光光度法；黏度；临界胶束浓度

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关键词：分光光度法黏度临界胶束浓度

Abstract： In this paper, by using iodine in the solution as colourdisplay reagent, critical micelle concentration(CMC) of nonionic surfactant Tween20/40 were investigated by ultraviolet absorption spectrophotometry,which were 519×10-5 mol/L and 190×10-5 mol/L,respectively. CMC of surfactants Tween20/40 by viscosity method were 500×10-5 mol/L and 193×10-5 mol/L, and the effect of different NaCl concentrations on CMC and viscosity were studied.Results showed that CMC determined by spectrophotometric method was closely agreed with that in literature.The solutions relative viscosity has a tendency of droping with increasing NaCl, while CMC values remain unchanged. For constant NaCl, relative viscosity increases at first and then keep constant when CMC is reached.

Keywords： spectrophotometry viscosity critical micelle concentration(CMC)

引用本文:

王新红，戴兢陶.Tween20/40的CMC测定及NaCl的影响[J]. 化学工业与工程, 2011,28(3): 37-40

WANG Xin-hong, DAI Jing-tao.Determination of CMC of Tween20/40 and Effect of NaCl on Viscosity[J]. Chemcial Industry and Engineering, 2011,28(3): 37-40