Transient and Steady Flow of a Lamellar Liquid-Crystalline Surfactant/Water System
Transient and Steady Flow of a Lamellar Liquid-Crystalline Surfactant/Water System
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DOI：
10.1021/la00002a053
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发表时间：
1995-02
期刊：
影响因子：
3.9
通讯作者：
J. Franco;J. Muñoz;C. Gallegos
中科院分区：
文献类型：
--
作者：
J. Franco;J. Muñoz;C. Gallegos
在不同的温度和浓度下，对聚氧乙烯醇/水体系的液晶样品进行了瞬态和稳态流动实验。从实验结果中，我们可以推断，瞬态响应是非常复杂的，既显示了应力过冲和下冲，这取决于剪切速率，表面活性剂浓度和温度的协同效应。此外，稳定的流动行为显着地依赖于剪切历史的样品。这些结果与机械诱导结构的出现有关，该结构受到相变区域（层状相和胶束层状相）附近的青睐。
Transient and steady flow experiments were carried out on liquid crystalline samples of poly(oxyethylene) alcohol/water systems, at different temperatures and concentrations within the lamellar phase region. From the experimental results we may deduce that the transient response is very complex, showing both a stress overshoot and an undershoot, depending on the cooperative effects of shear rate, surfactant concentration, and temperature. Moreover, the steady flow behavior depends dramatically on the shear history of the samples. These results have been related to the appearance of a mechanically induced structure, favored by the proximity to phase transition regions (cubic-lamellar phase and micellar-lamellar phase).