A surface flattening method for characterizing the surface stress, drained Poisson's ratio and diffusivity of poroelastic gels,Soft Matter

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A surface flattening method for characterizing the surface stress, drained Poisson's ratio and diffusivity of poroelastic gels
Soft Matter ( IF 2.9 ) Pub Date : 2021-07-13 , DOI: 10.1039/d1sm00513h
Zezhou Liu ₁ , Chung-Yuen Hui , Anand Jagota , Jian Ping Gong , Ryuji Kiyama

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When a poroelastic gel is released from a patterned mold, surface stress drives deformation and solvent migration in the gel and flattens its surface profile in a time-dependent manner. Specifically, the gel behaves like an incompressible solid immediately after removal from the mold, and becomes compressible as the solvent is able to squeeze out of the polymer network. In this work, we use the finite element method (FEM) to simulate this transient surface flattening process. We assume that the surface stress is isotropic and constant, the polymer network is linearly elastic and isotropic, and that solvent flow obeys Darcy's law. The short-time and long-time surface profiles can be used to determine the surface stress and drained Poisson's ratio of the gel. Our analysis shows that the drained Poisson's ratio and the diffusivity of the gel can be obtained using interferometry and high-speed video microscopy, without mechanical measurement.

中文翻译：

表征多孔弹性凝胶的表面应力、排水泊松比和扩散率的表面平整方法

当多孔弹性凝胶从带图案的模具中释放出来时，表面应力会驱动凝胶中的变形和溶剂迁移，并以时间依赖的方式使其表面轮廓变平。具体而言，凝胶在从模具中取出后立即表现为不可压缩的固体，并且随着溶剂能够从聚合物网络中挤出而变得可压缩。在这项工作中，我们使用有限元方法 (FEM) 来模拟这种瞬态表面平整过程。我们假设表面应力是各向同性和恒定的，聚合物网络是线性弹性和各向同性的，并且溶剂流动遵循达西定律。短期和长期表面轮廓可用于确定凝胶的表面应力和排水泊松比。我们的分析表明，排出的泊松

更新日期：2021-07-21

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