Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY, 40506, USA.
Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, 80309, USA.
Nat Commun. 2023 Apr 24;14(1):2362. doi: 10.1038/s41467-023-38091-7.
Utilizing colloidal probe, lateral force microscopy and simultaneous confocal microscopy, combined with finite element analysis, we investigate how a microparticle starts moving laterally on a soft, adhesive surface. We find that the surface can form a self-contacting crease at the leading front, which results from a buildup of compressive stress. Experimentally, creases are observed on substrates that exhibit either high or low adhesion when measured in the normal direction, motivating the use of simulations to consider the role of adhesion energy and interfacial strength. Our simulations illustrate that the interfacial strength plays a dominating role in the nucleation of a crease. After the crease forms, it progresses through the contact zone in a Schallamach wave-like fashion. Interestingly, our results suggest that this Schallamach wave-like motion is facilitated by free slip at the adhesive, self-contacting interface within the crease.
利用胶体探针、横向力显微镜和共聚焦显微镜，并结合有限元分析，我们研究了微粒子如何在柔软、粘性的表面上开始横向移动。我们发现，表面在前导前沿会形成自接触的褶皱，这是由于压缩应力的积累造成的。实验中，在法向测量时表现出高或低附着力的基底上观察到褶皱，这促使我们使用模拟来考虑附着力能量和界面强度的作用。我们的模拟表明，界面强度在褶皱的成核中起着主导作用。褶皱形成后，它以类似于沙勒马赫波的方式在接触区域内传播。有趣的是，我们的结果表明，这种类似于沙勒马赫波的运动是通过褶皱内的自由滑动的自接触粘性界面来促进的。
Zotero 插件
