论文标题
溶剂迁移折叠的逆转
Reversal of Solvent Migration in Poroelastic Folds
论文作者
论文摘要
聚合物网络和生物组织通常会因溶剂而肿胀，因此它们的特性从肿胀和弹性应激之间的耦合中浮出水面。这种孔隙弹性耦合在润湿，粘附和折痕中变得特别复杂，为此，出现尖锐的折叠，甚至可以导致相位分离。在这里，我们解决了毛弹性表面褶皱的奇异性质，并确定折痕附近的溶剂分布。令人惊讶的是，根据折叠的角度出现了两个相反的情况。根据非平凡的空间分布，在诸如折痕之类的钝褶中，发现溶剂已在折痕尖附近完全排出。对于具有急性折叠角的润湿脊，与折痕相比，溶剂迁移是逆转的，并且在折头尖端的肿胀程度最大。我们讨论了我们的毛弹性折叠分析如何为相分离，断裂和接触角磁滞提供解释。
Polymer networks and biological tissues are often swollen by a solvent, such that their properties emerge from a coupling between swelling and elastic stress. This poroelastic coupling becomes particularly intricate in wetting, adhesion, and creasing, for which sharp folds appear that can even lead to phase separation. Here we resolve the singular nature of poroelastic surface folds and determine the solvent distribution in the vicinity of the fold-tip. Surprisingly, two opposite scenarios emerge depending on the angle of the fold. In obtuse folds such as creases, it is found that the solvent is completely expelled near the crease-tip, according to a nontrivial spatial distribution. For wetting ridges with acute fold angles, the solvent migration is reversed as compared to creasing, and the degree of swelling is maximal at the fold-tip. We discuss how our poroelastic fold-analysis offers an explanation for phase separation, fracture and contact angle hysteresis.
