How Things Get Stuck: Kinetics, Elastohydrodynamics, and Soft Adhesion
How Things Get Stuck: Kinetics, Elastohydrodynamics, and Soft Adhesion
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DOI：
10.1103/physrevlett.108.226104
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发表时间：
2012-05-30
影响因子：
8.6
通讯作者：
Mahadevan, L.
中科院分区：
文献类型：
--
作者：
Mani, Madhav;Gopinath, Arvind;Mahadevan, L.
我们认为粘的流体浸没的胶体颗粒与基板上涂有聚合物系链，在许多自然和人工系统中的软，湿粘附模型。我们的理论占结合的动力学，系链的弹性，和流体动力学的胶体和基板之间的流体排水，其特征在于由三个无量纲参数：粘性排水时间的比率结合的动力学，弹性热能的比率，和颗粒的大小相对于聚合物刷的高度。对于典型的实验参数和离散家庭的系绳，我们发现，通过间断的步骤，快速过渡到越来越多的约束状态分离缓慢的老化瞬态，与最近的观察结果一致的粘附收益。我们的研究结果还表明，绑定粒子是容易受到波动驱动的不稳定性平行的基板。
We consider the sticking of a fluid-immersed colloidal particle with a substrate coated by polymeric tethers, a model for soft, wet adhesion in many natural and artificial systems. Our theory accounts for the kinetics of binding, the elasticity of the tethers, and the hydrodynamics of fluid drainage between the colloid and the substrate, characterized by three dimensionless parameters: the ratio of the viscous drainage time to the kinetics of binding, the ratio of elastic to thermal energies, and the size of the particle relative to the height of the polymer brush. For typical experimental parameters and discrete families of tethers, we find that adhesion proceeds via punctuated steps, where rapid transitions to increasingly bound states are separated by slow aging transients, consistent with recent observations. Our results also suggest that the bound particle is susceptible to fluctuation-driven instabilities parallel to the substrate.