Buchanan M, Atakhorrami M, Palierne J F, MacKintosh F C, Schmidt C F
Department of Physics and Astronomy, Vrije Universiteit Amsterdam, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jul;72(1 Pt 1):011504. doi: 10.1103/PhysRevE.72.011504. Epub 2005 Jul 21.
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.
我们通过高频微观流变学测量了蠕虫状胶束缠结溶液的频率依赖性剪切模量，并将结果与对相同样品进行的宏观流变学实验结果进行了比较。使用基于激光干涉测量法的光学微观流变学，我们在高达约100kHz的六个数量级的频率范围内测量了损耗模量和储能模量。我们给出了缠结区域内一个数量级浓度范围内的数据，发现微观流变学和宏观流变学之间有很好的一致性，从而验证了最近开发的微观流变学技术。通过合并不同浓度的数据，我们还确定了平台模量的浓度标度以及高频下复剪切模量的幂律指数。
