Wormlike micelles in Tween-80/CmEO3 mixed nonionic surfactant systems in aqueous media.
Wormlike micelles in Tween-80/CmEO3 mixed nonionic surfactant systems in aqueous media.
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DOI：
10.1016/j.jcis.2007.02.090
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发表时间：
2007-08
影响因子：
9.9
通讯作者：
D. Varade;K. Ushiyama;L. Shrestha;K. Aramaki
中科院分区：
文献类型：
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作者：
D. Varade;K. Ushiyama;L. Shrestha;K. Aramaki
研究了非离子表面活性剂聚氧乙烯山梨醇单油酸酯（Tween-80）和三氧乙烯烷基醚（CmEO3, m=12、14和16）混合体系中粘弹性虫状胶束溶液的形成和流变行为。Tween-80的半稀水溶液在cmeo3存在下，粘度急剧增加，达到最大值时形成凝胶状高粘弹性溶液，但超过中间浓度后粘度下降，最终相分离。当c12eo3被c14eo3取代时，胶束生长更有效。然而，随着烷基链长度的进一步增加，即随着C16EO3的加入，在粘弹性溶液形成之前发生相分离。研究了温度对水/吐温-80/ c14eo3混合表面活性剂体系的影响。随着温度的升高，黏度增加较快，在C14EO3浓度较低时达到最大。随着温度的升高，胶束的一维生长增强，其主要原因是聚集体的自发曲率减小。利用小角x射线散射（SAXS）技术对Tween-80水溶液和混合水/Tween-80/ cmeo3体系中胶束的结构进行了研究，证实了上述体系中胶束的一维生长。
Formation and rheological behaviour of viscoelastic wormlike micellar solution in aqueous mixed system of nonionic surfactants, polyoxyethylene sorbitan monooleate (Tween-80) and trioxyethylene alkyl ether (CmEO3, m=12, 14, and 16) was studied. The semi-dilute aqueous solution of Tween-80, in presence of CmEO3shows a sharp increase in viscosity leading to the formation of a gel-like highly viscoelastic solution reaching a maximum, but decreases beyond an intermediate concentration and finally phase separates. When C12EO3is replaced by C14EO3the micellar growth occurs more effectively. However, with further increase in alkyl chain length, i.e. with C16EO3, phase separation occurs before a viscoelastic solution is formed. The effect of temperature on the water/Tween-80/C14EO3mixed surfactant system was also studied. With increase in temperature, viscosity increases more promptly and the viscosity maximum is attained at relatively lower concentration of C14EO3. Enhanced one dimensional micellar growth with increase in the temperature is mainly attributed to the decrease in the spontaneous curvature of the aggregates. Structural investigation by means of small-angle X-ray scattering (SAXS) technique of micelles in aqueous solution of Tween-80 and mixed water/Tween-80/CmEO3systems confirmed the one dimensional micellar growth in the above system.