Two-point microrheology of inhomogeneous soft materials
Two-point microrheology of inhomogeneous soft materials
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DOI：
10.1103/physrevlett.85.888
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发表时间：
2000-07-24
影响因子：
8.6
通讯作者：
Weitz, DA
中科院分区：
文献类型：
--
作者：
Crocker, JC;Valentine, MT;Weitz, DA
我们展示了一种测量软粘弹性介质微观流变学的新方法，该方法基于嵌入示踪粒子对的热运动的互相关。该方法不依赖于示踪剂和介质之间耦合的确切性质，并且可以为高度不均匀的材料提供准确的流变数据。我们用瓜尔胶溶液证明了该方法的准确性，而其他显微方法由于聚合物的介观不均匀性而失败。 F-肌动蛋白溶液中的测量表明传统的微流变学测量可能无法反映真实的整体行为。
We demonstrate a novel method for measuring the microrheology of soft viscoelastic media, based on cross correlating the thermal motion of pairs of embedded tracer particles. The method does not depend on the exact nature of the coupling between the tracers and the medium, and yields accurate rheological data for highly inhomogeneous materials. We demonstrate the accuracy of this method with a guar solution, for which other microscopic methods fail due to thr polymer's mesoscopic inhomogeneity. Measurements in an F-actin solution suggest conventional microrheology measurements may not reflect the true bulk behavior.