Shear Flow Behavior of Bidisperse Rodlike Colloids,Macromolecules

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Shear Flow Behavior of Bidisperse Rodlike Colloids
Macromolecules ( IF 5.1 ) Pub Date : 2020-03-20 , DOI: 10.1021/acs.macromol.9b02239
Christian Lang ₁ , Minne Paul Lettinga _{2,

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Affiliation

A priori prediction of the flow properties of polydisperse rodlike macromolecules is a prerequisite for the understanding of many industrial and biological processes. Using mixtures of two naturally monodisperse viruses, we create a benchmark bidisperse suspension of rodlike colloids to test the effect of length bidispersity on the shear flow behavior. We find that the zero-shear viscosity is a nonlinear function of the fraction of long rods because of the strong length dependence of the rotational dynamics, which determine this quantity. With increasing concentration and fraction of long rods, the shear thinning gets more pronounced, following the predictions of our recently proposed theory which we extended for bidisperse mixtures. This theory allows for a quantitative prediction of the flow properties of bi- and polydisperse mixtures of ideal rods at least for moderate polydispersity.

中文翻译：

双分散棒状胶体的剪切流动行为

多分散棒状大分子流动特性的先验预测是理解许多工业和生物过程的前提。使用两种自然单分散病毒的混合物，我们创建了杆状胶体的基准双分散悬浮液，以测试长度双分散对剪切流动行为的影响。我们发现零剪切粘度是长杆的分数的非线性函数，这是因为旋转动力学对长度的依赖性很强，这决定了该数量。随着长棒的浓度和分数的增加，遵循我们最近提出的理论的预测，剪切稀化变得更加明显，该理论扩展了双分散混合物。

更新日期：2020-04-24

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