Shearing active gels close to the isotropic-nematic transition
Shearing active gels close to the isotropic-nematic transition
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DOI：
10.1103/physrevlett.101.068102
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发表时间：
2008-08-08
影响因子：
8.6
通讯作者：
Yeomans, J. M.
中科院分区：
文献类型：
--
作者：
Cates, M. E.;Fielding, S. M.;Yeomans, J. M.
我们对接近各向同性向列相转变的活性凝胶板的流变特性进行了数值研究。流动行为显示出对样本大小、边界条件和体本构曲线的强烈依赖性，体本构曲线在进入向列相时，在原点处获得活动引起的不连续性。收缩系统（例如肌动球蛋白凝胶）的亚稳态各向同性相内的前体给出了粘度发散；其对应的可拉伸悬浮液允许具有零表观粘度的剪切带流动。
We study numerically the rheological properties of a slab of active gel close to the isotropic-nematic transition. The flow behavior shows a strong dependence on the sample size, boundary conditions, and on the bulk constitutive curve, which, on entering the nematic phase, acquires an activity-induced discontinuity at the origin. The precursor of this within the metastable isotropic phase for contractile systems (e. g., actomyosin gels) gives a viscosity divergence; its counterpart for extensile suspensions admits instead a shear-banded flow with zero apparent viscosity.