3 years ago

Giant Slip Induced Anomalous Dewetting of an Ultrathin Film on a Viscous Sublayer

Puchalapalli Dinesh Sankar Reddy, Dipankar Bandyopadhyay, Ashutosh Sharma, Sang Woo Joo, Lin Xu
A ‘giant’ slip dynamics was engineered to a highly confined interface of a dewetting polymethylmethacrylate (PMMA) ultrathin film by introducing a lubricating viscous polystyrene (PS) sublayer. The crossover of regimes from no-slip to giant-slip was engendered by tuning the viscosity and thickness of the sublayer. A long-range hole-rim interaction with increase in slippage on the PMMA-PS interface transformed the circular holes on the PMMA surface into the noncircular faceted ones. The extent of the slippage and the transition of the length scales from slip-dominated to no-slip regime were evaluated using a general linear stability analysis. The proposed formulation provided an analytical tool to evaluate the slippage effective at the soft and deformable liquid-liquid interfaces.

Publisher URL: https://www.nature.com/articles/s41598-017-14861-4

DOI: 10.1038/s41598-017-14861-4

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