Virginia Tech, Engineering Science and Mechanics, 222 Norris Hall, Blacksburg, VA, USA.
Soft Matter. 2013 Jun 21;9(23):5524-8. doi: 10.1039/c3sm00135k.
Swelling-induced deformations are common in many biological and industrial environments, and the shapes and patterns that emerge can vary across many length scales. Here we present an experimental study of a transition between macroscopic structural bending and microscopic surface creasing in elastomeric beams swollen non-homogeneously with favorable . We show that this transition is dictated by the materials and geometry of the system, and we develop a simple scaling model based on competition between bending and swelling energies that predicts if a given droplet would deform a polymeric structure macroscopically or microscopically. We demonstrate how proper tuning of materials and geometry can generate instabilities at multiple length scales in a single structure.
肿胀引起的变形在许多生物和工业环境中很常见，出现的形状和模式可以在多个长度尺度上变化。在这里，我们研究了在有利的条件下非均匀肿胀的弹性梁中从宏观结构弯曲到微观表面起皱的转变。我们表明，这种转变取决于系统的材料和几何形状，我们开发了一个基于弯曲和肿胀能量竞争的简单标度模型，该模型可以预测给定液滴是否会使聚合物结构宏观或微观变形。我们展示了如何通过适当调整材料和几何形状在单个结构中产生多个长度尺度的不稳定性。
