Viscoelastic wormlike micelles of long polyoxyethylene chain phytosterol with lipophilic nonionic surfactant in aqueous solution.
Viscoelastic wormlike micelles of long polyoxyethylene chain phytosterol with lipophilic nonionic surfactant in aqueous solution.
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DOI：
10.1021/jp8102244
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发表时间：
2009-02
期刊：
影响因子：
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通讯作者：
Suraj Sharma;L. Shrestha;K. Tsuchiya;K. Sakai;H. Sakai;M. Abe
中科院分区：
文献类型：
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作者：
Suraj Sharma;L. Shrestha;K. Tsuchiya;K. Sakai;H. Sakai;M. Abe
研究了长链聚氧乙烯植物甾醇（PhyEO 30）和聚氧乙烯十二烷基醚（C12 EOn，n = 3和4）表面活性剂在水中混合体系中粘弹性蠕虫状胶束的形成、结构和流变行为。在25 ℃下构建了水/PhyEO 30/C12 EOn的部分三元相图。在稀溶液中加入C12 EOn使PhyEO 30溶液的粘度增加几个数量级，并形成在低剪切频率下表现出Maxwell行为的缠结蠕虫状胶束的粘弹性胶束溶液。随着连续加入C12 EOn，最终发生相分离，形成与胶束相共存的囊泡分散体的浑浊溶液。当C12 EO 3取代C12 EO 4时，已经观察到快速胶束生长。然而，在C12 E03体系中没有看到粘度最大值;粘度连续增加直到相分离。研究了温度对水/PhyEO_（30）/C_（12）EO_3体系的影响。小角X-射线散射测量表明，一维胶束生长诱导C12 EOn和良好的支持来自流变学的结论。
We have studied the formation, structure, and rheological behavior of viscoelastic wormlike micelles in the mixed system of long polyoxyethylene chain phytosterol (PhyEO30) and polyoxyethylene dodecyl ether (C12EOn, n = 3 and 4) surfactants in water. Partial ternary phase diagrams of water/PhyEO30/C12EOn are constructed at 25 degrees C. Addition of C12EOn to the aqueous solution of PhyEO30 in a dilute region increases the viscosity by several orders and forms viscoelastic micellar solution of entangled wormlike micelles showing the Maxwellian behavior at low shear frequencies. With successive addition of C12EOn, ultimately a phase separation occurs with the formation of turbid solution of vesicular dispersion coexisting with the micellar phase. A rapid micellar growth has been observed when C12EO3 replaces the C12EO4. However, no viscosity maximum is seen with the C12EO3 system; the viscosity increases continuously until phase separation. The effect of temperature on water/PhyEO30/C12EO3 system has also been studied. Small-angle X-ray scattering measurements have shown the one-dimensional micellar growth induced by C12EOn and well support the conclusions derived from rheometry.