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arXiv 2007.03017cond-mat.soft
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三维活性流体的约束控制弯曲不稳定性

Confinement controlled bend instability of three-dimensional active fluids

Pooja Chandrakar, Minu Varghese, S. Ali Aghvami, Aparna Baskaran, Zvonimir Dogic, Guillaume Duclos

摘要:

长波长形变的自发增长是具有取向有序的活性流体的一个定义特征。本文研究了双轴矩形约束对初始剪切取向的三维各向同性活性流体不稳定性的影响,该流体由可伸展微管束和驱动蛋白分子马达组成。在约束下,这种流体表现出有限波长自放大弯曲变形,其在与最强约束方向正交的平面中生长。不稳定波长和增长率都随着约束的减弱而增大。这些发现与最小流体动力学模型一致,该模型预测增长最快的变形是由主动驱动和弹性松弛的平衡所确定的。在高度限制制度的实验证实,不稳定波长设置的主动和弹性应力,这是独立控制的电机和非能动交联剂的浓度的平衡。

英文摘要:

Spontaneous growth of long-wavelength deformations is a defining feature of active fluids with orientational order. We investigate the effect of biaxial rectangular confinement on the instability of initially shear-aligned 3D isotropic active fluids composed of extensile microtubule bundles and kinesin molecular motors. Under confinement, such fluids exhibit finite-wavelength self-amplifying bend deformations which grow in the plane orthogonal to the direction of the strongest confinement. Both the instability wavelength and the growth rate increase with weakening confinement. These findings are consistent with a minimal hydrodynamic model, which predicts that the fastest growing deformation is set by a balance of active driving and elastic relaxation. Experiments in the highly confined regime confirm that the instability wavelength is set by the balance of active and elastic stresses, which are independently controlled by the concentration of motors and non-motile crosslinkers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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