Understanding surface mechanics of soft solids, such as soft polymeric gels, is crucial in many engineering processes, such as dynamic wetting and adhesive failure. In these situations, a combination of capillary and elastic forces drives the motion, which is balanced by dissipative mechanisms to determine the rate. While shear rheology ( viscoelasticity) has long been assumed to dominate the dissipation, recent works have suggested that compressibility effects ( poroelasticity) could play roles in swollen networks. We use fast interferometric imaging to quantify the relaxation of surface deformations due to a displaced contact line. By systematically measuring the profiles at different time and length scales, we experimentally observe a crossover from viscoelastic to poroelastic surface relaxations.

中文翻译：

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软固体表面的粘弹性和多孔弹性松弛

了解诸如软聚合物凝胶之类的软固体的表面力学在许多工程过程中至关重要，例如动态润湿和粘合破坏。在这些情况下，毛细作用力和弹力的组合驱动运动，该运动由耗散机制平衡以确定运动速率。尽管长期以来一直以剪切流变学（粘弹性）为主导，但最近的研究表明可压缩性（多孔弹性）可能在膨胀网络中起作用。我们使用快速干涉成像来量化由于位移的接触线导致的表面变形的松弛。通过系统地测量不同时间和长度尺度下的轮廓，我们实验观察了从粘弹性到多孔弹性的表面弛豫的转换。