High-frequency microrheology of wormlike micelles
High-frequency microrheology of wormlike micelles
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DOI：
10.1103/physreve.72.011504
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发表时间：
2005-07-01
影响因子：
2.4
通讯作者：
Schmidt, CF
中科院分区：
文献类型：
--
作者：
Buchanan, M;Atakhorrami, M;Schmidt, CF
用高频微流变学方法测量了蠕虫状胶束缠结溶液的频率依赖性剪切模量，并与相同样品的宏观流变学实验结果进行了比较。使用基于激光干涉的光学微流变学，我们测量了六十多年的频率高达约100 kHz的损耗和储能模量。我们目前的数据超过十年的浓度在纠缠制度，并找到良好的协议之间的微观和宏观流变学，从而验证最近开发的微观流变学技术。通过对不同浓度的数据进行压缩，我们进一步确定了平台模量的浓度标度和高频下复剪切模量的幂律指数。
We have measured the frequency-dependent shear modulus of entangled solutions of wormlike micelles by high-frequency microrheology and have compared the results with those from macrorheology experiments done on the same samples. Using optical microrheology based on laser interferometry we have measured loss and storage moduli over six decades in frequency up to about 100 kHz. We present data over a decade in concentration in the entangled regime and find good agreement between micro- and macrorheology, thus validating recently developed microrheology techniques. By collapsing data for different concentrations, we furthermore determine both the concentration scaling of the plateau modulus and a power-law exponent of the complex shear modulus at high frequencies.