title: Cavity shape transformation during peeling on elastic microchannel-patterned substrates filled with a viscous liquid.
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-1. 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-1. Such cavity formation and shape regimes could be important for improving the design of pressure-sensitive adhesives.
authors.affiliation: Department of Chemical Engineering and Center for Nanosciences, Indian Institute of Technology, Kanpur-208016, UP, India. ashutos@iitk.ac.in.
authors.forename: Nayantika
authors.initials: N
authors.lastname: Chaudhari
authors.affiliation: Department of Chemical Engineering and Center for Nanosciences, Indian Institute of Technology, Kanpur-208016, UP, India. ashutos@iitk.ac.in.
authors.forename: Tushar
authors.initials: T
authors.lastname: Deshpande
authors.affiliation: Department of Chemical Engineering and Center for Nanosciences, Indian Institute of Technology, Kanpur-208016, UP, India. ashutos@iitk.ac.in.
authors.forename: Yogesh R G
authors.initials: YR
authors.lastname: Singh
authors.affiliation: Department of Chemical Engineering and Center for Nanosciences, Indian Institute of Technology, Kanpur-208016, UP, India. ashutos@iitk.ac.in.
authors.forename: Sandip
authors.identifier: http://orcid.org/0000-0002-8585-8748
authors.initials: S
authors.lastname: Patil
authors.affiliation: Department of Chemical Engineering and Center for Nanosciences, Indian Institute of Technology, Kanpur-208016, UP, India. ashutos@iitk.ac.in.
authors.forename: Manish
authors.identifier: http://orcid.org/0000-0003-3564-1118
authors.initials: M
authors.lastname: Kulkarni
authors.affiliation: Unilever R&D, 64 Main Road, Whitefield, Bangalore 560066, India.
authors.forename: Janhavi
authors.initials: J
authors.lastname: Raut
authors.affiliation: Department of Chemical Engineering and Center for Nanosciences, Indian Institute of Technology, Kanpur-208016, UP, India. ashutos@iitk.ac.in.
authors.forename: Ashutosh
authors.initials: A
authors.lastname: Sharma