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Cavity shape transformation during peeling on elastic microchannel-patterned substrates filled with a viscous liquid
Nayantika Chaudhari1, Tushar Deshpande1, Yogesh R G Singh1
1Department of Chemical Engineering and Center for Nanosciences, Indian Institute of Technology, Kanpur-208016, UP, India. ashutos@iitk.ac.in.
Soft Matter
|March 11, 2017
Summary
Researchers studied cavity shape changes in a patterned bilayer of polydimethylsiloxane (PDMS) during peel tests. Findings reveal three distinct cavity shape regimes crucial for designing better pressure-sensitive adhesives.
Area of Science:
- Materials Science
- Adhesion Science
- Polymer Physics
Background:
- Natural adhesive pads offer insights into detachment mechanics.
- Understanding cavity dynamics in patterned bilayer systems is key for advanced adhesives.
Purpose of the Study:
- To investigate cavity shape evolution during peel tests on a patterned bilayer system.
- To correlate cavity shape with microchannel dimensions and dimensionless parameters.
Main Methods:
- Peel tests were conducted on a 10% cross-linked polydimethylsiloxane (PDMS) elastic microchannel filled with 1% cross-linked viscous PDMS liquid.
- Cavity shape was analyzed as a function of microchannel dimensions.
- Dimensionless cavity shape factor (CSF) and characteristic stress decay length (K^-1) were correlated.
Main Results:
- Three distinct cavity shape regimes were identified: elliptical, circular, and binary.
- These regimes are dependent on the values of CSF and K^-1.
- The study mapped cavity formation and shape based on these parameters.
Conclusions:
- Cavity formation and shape regimes in patterned bilayer PDMS systems are predictable.
- These findings can guide the design of improved pressure-sensitive adhesives.
- The study provides a framework for understanding detachment mechanics in soft matter systems.
