CTAB/NaSal表面活性剂溶液的自相似剪切增稠行为
Self-similar shear-thickening behavior in CTAB/NaSal surfactant solutions
摘要：
盐浓度Cs的剪切增稠和剪切增稠相的表观弛豫时间的临界剪切速率所需的效果，已系统地研究了稀CTAB/NaSal溶液。实验数据表明，自相似行为的临界剪切速率和弛豫时间的函数Cs。具体地说，前者~ Cs^（-6），而后者~ Cs^（6），使得剪切增稠相开始的有效韦森伯格数仅弱依赖于Cs。一个程序已被开发到一个单一的主曲线中的表观剪切粘度与剪切速率的数据获得的各种值的Cs崩溃。讨论了Cs对不同表面活性剂浓度下剪切诱导凝胶相的弹性模量和网格尺寸的影响。使用不同的流动池（Couette和锥板）进行的实验表明，临界剪切速率，松弛时间和最大粘度达到的几何形状无关。间接采用简化的流体动力学不稳定性分析的剪切凝胶-流体界面推断的凝胶相的弹性模量是在定性的协议与预测的纠缠相的生活聚合物。一个定性的机制相结合的平均胶束长度和德拜参数与剪切诱导的棒状胶束的构型变化的Cs的效果提出合理化SIS形成的自相似性。
英文摘要：
The effect of salt concentration Cs on the critical shear rate required for the onset of shear thickening and apparent relaxation time of the shear-thickened phase, has been investigated systematically for dilute CTAB/NaSal solutions. Experimental data suggest a self-similar behavior of the critical shear rate and relaxation time as functions of Cs. Specifically, the former ~ Cs^(-6) whereas the latter ~ Cs^(6) such that an effective Weissenberg number for the onset of the shear thickened phase is only weakly dependent on Cs. A procedure has been developed to collapse the apparent shear viscosity versus shear rate data obtained for various values of Cs into a single master curve. The effect of Cs on the elastic modulus and mesh size of the shear-induced gel phase for different surfactant concentrations is discussed. Experiments performed using different flow cells (Couette and cone-and-plate) show that the critical shear rate, relaxation time and the maximum viscosity attained are geometry-independent. The elastic modulus of the gel phase inferred indirectly by employing simplified hydrodynamic instability analysis of a sheared gel-fluid interface is in qualitative agreement with that predicted for an entangled phase of living polymers. A qualitative mechanism that combines the effect of Cs on average micelle length and Debye parameter with shear-induced configurational changes of rod-like micelles is proposed to rationalize the self-similarity of SIS formation.
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