Karnal Preetika, Wang Yumo, Jha Anushka, Gryska Stefan, Barrios Carlos, Frechette Joelle
Department of Chemical and Biomolecular Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
Department of Chemical and Biomolecular Engineering, Lehigh University, 124 East Morton Street, Building 205, Bethlehem, Pennsylvania 18015, USA.
Phys Rev Lett. 2023 Sep 29;131(13):138201. doi: 10.1103/PhysRevLett.131.138201.
Interfacial instabilities are common phenomena observed during adhesion measurements involving viscoelastic polymers or fluids. Typical probe-tack adhesion measurements with soft adhesives are conducted with rigid probes. However, in many settings, such as for medical applications, adhesives make and break contact from soft surfaces such as skin. Here we study how detachment from soft probes alters the debonding mechanism of a model viscoelastic polymer film. We demonstrate that detachment from a soft probe suppresses Saffman-Taylor instabilities commonly encountered in adhesion. We suggest the mechanism for interface stabilization is elastohydrodynamic deformation of the probe and propose a scaling for the onset of stabilization.
界面不稳定性是在涉及粘弹性聚合物或流体的粘附力测量过程中观察到的常见现象。使用刚性探针进行典型的软粘合剂探针粘性粘附力测量。然而，在许多情况下，例如在医疗应用中，粘合剂与诸如皮肤等柔软表面进行接触和分离。在这里，我们研究从软探针上分离如何改变模型粘弹性聚合物薄膜的脱粘机制。我们证明，从软探针上分离会抑制粘附过程中常见的萨夫曼-泰勒不稳定性。我们提出界面稳定的机制是探针的弹性流体动力变形，并提出了稳定起始的标度关系。
