Cavity shape transformation during peeling on elastic microchannel-patterned substrates filled with a viscous liquid.
basic_science · Level V
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- Record sourced from PubMed, PMID 28282091.
- Also identified by DOI 10.1039/c7sm00016b.
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Abstract
Inspired by the detachment mechanics of natural adhesive pads, we studied the change in cavity shape during peel tests on a 10% cross-linked polydimethylsiloxane (PDMS) elastic microchannel filled with 1% cross-linked viscous PDMS liquid (patterned bilayer). During peeling, we explored cavity shape as a function of microchannel dimensions and correlated the dimensionless cavity shape factor (CSF) and characteristic stress decay length, K<sup>-1</sup>. The peel test on the liquid-filled elastic microchannel shows three distinct cavity-shape regimes, elliptical, circular, and binary, based on the values of CSF and K<sup>-1</sup>. Such cavity formation and shape regimes could be important for improving the design of pressure-sensitive adhesives.