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arXiv 1408.4181cond-mat.soft
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考虑惯性效应的粘弹性流体高频微观流变学

Accounting for inertia effects to access the high-frequency microrheology of viscoelastic fluids

P. Domínguez-García, Frédéric Cardinaux, Elena Bertseva, László Forró, Frank Scheffold, Sylvia Jeney

摘要:

利用光阱干涉法和扩散波光谱法研究了微球在水中和粘弹性蠕虫状胶束溶液中的布朗运动。通过从这两种技术获得的均方位移,我们推导出的流体在高频率下的机械性能,明确占在短时间尺度的粒子和周围的流体的惯性效应。对于蠕虫状胶束的解决方案,我们恢复的3/4标度指数的损耗模量超过二十年的频率所预测的半柔性聚合物的理论。

英文摘要:

We study the Brownian motion of microbeads immersed in water and in a viscoelastic wormlike micelles solution by optical trapping interferometry and diffusing wave spectroscopy. Through the mean-square displacement obtained from both techniques, we deduce the mechanical properties of the fluids at high frequencies by explicitly accounting for inertia effects of the particle and the surrounding fluid at short time scales. For wormlike micelle solutions, we recover the 3/4 scaling exponent for the loss modulus over two decades in frequency as predicted by the theory for semiflexible polymers.

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