Viscoelastic wormlike micellar solutions in mixed environmentally friendly nonionic surfactant systems
Viscoelastic wormlike micellar solutions in mixed environmentally friendly nonionic surfactant systems
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DOI：
10.1016/j.colsurfa.2008.10.022
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
Suraj Sharma;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;K. Tsuchiya;K. Sakai;H. Sakai;M. Abe
在25℃下研究了聚氧乙烯(20)山梨醇单油酸酯(Tween80)/单月桂(ML)/水体系的相和流变性。在水/表面活性剂二元体系中，Tween80在较宽的浓度范围内(∼42wt%)形成各向同性胶束溶液。随着ML连续加入吐温80水溶液中，粘度迅速增加，形成粘弹性溶液。形成的粘弹性胶束溶液在低频区遵循蠕虫状胶束体系典型的Maxwell模型。随着ML的进一步加入，粘度在达到最大值后下降，并发生相分离。随着吐温80浓度的增加，胶束的生长开始于较低浓度的ML。胶束的生长可以简单地用ML的加入使吐温80头基的有效面积减小来解释。
A study of the phase and rheological behavior of polyoxyethylene(20)sorbitan monooleate (Tween 80)/monolaurin (ML)/water is presented at 25°C. In water/surfactant binary system, Tween 80 forms an isotropic micellar solution over wide concentration range (∼42wt%). With successive addition of ML to the aqueous Tween 80 solution, viscosity increases rapidly and a viscoelastic solution is formed. The viscoelastic micellar solution formed follows the Maxwell model typical of wormlike micellar systems at low-frequency region. With further addition of ML, the viscosity drops after a maximum and phase separation occurs. On increasing the concentration of Tween 80, micellar growth starts at a slightly lower concentration of ML. The micellar growth can be simply explained by reducing the effective area of Tween 80 head group upon addition of ML.