Capsule Migration and Deformation in a Converging Micro-Capillary

The lateral migration of elastic capsules towards a microchannel centerline plays a major role in industrial and physiological processes. Via our computational investigation, we show that a constriction connecting two straight microchannels facilitates the lateral capsule migration considerably, which is relatively slow in straight channels. Our work reveals that the significant cross-streamline migration inside the constriction is dominated by the strong hydrodynamic forces due to the capsule size. However, in the downstream straight channel, the increased interfacial deformation at higher capillary numbers or a lower viscosity ratio and lower membrane hardness results in increased lateral cross-streamline migration. Thus, our work highlights the different migration mechanisms occurring over curved and straight streamlines.

Nanomechanical behavior and interfacial deformation beyond the elastic limit in 2D metal–organic framework nanosheets

Quantitative nanoscale mechanics of 2D MOF nanosheets containing atomic scale porosity, revealing interfacial failure mechanisms triggered by using a diamond AFM nanoindenter. This methodology can be applied to numerous van der Waals solids.