Control of adhesion via internally pressurized subsurface microchannels

Langmuir : the ACS Journal of Surfaces and Colloids
Edward Peter Arul, Animangsu Ghatak

Abstract

While pressure sensitive adhesives in general consist of a layer of viscoelastic glue sandwiched between two adherents, we explore here the design of an adhesive embedded with microchannels which remain either open to atmosphere or pressurized to different positive and negative pressures. We subject these layers to indentation by a rigid cylinder such that in addition to adhesion between the indenter and the adhesive surface, the inner walls of the channels too self-adhere; during retraction of the indenter, these surfaces debond, but at a different load, thus resulting in hysteresis. When these channels are pressurized to different extents, the contact areas of various interfaces vary, so also the resultant hysteresis. For experiments with constant depth of indentation, the hysteresis increases and attains maxima at an intermediate value of the internal pressure inside the channels. The hysteresis increases also with the skin thickness of the adhesive over the channels. These results show that subsurface channels in an adhesive allow active manipulation of adhesion over a large range via coupled effect of geometry of channels, their surface characteristics, and the pressure inside.

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Citations

Apr 5, 2013·Journal of the Royal Society, Interface·Dadhichi ParetkarEduard Arzt
Oct 13, 2015·ACS Applied Materials & Interfaces·Julia PurtovElmar Kroner
Jan 16, 2015·ACS Applied Materials & Interfaces·Jeffrey KrahnCarlo Menon
Apr 16, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Animangsu Ghatak
Jun 22, 2021·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·I I Argatov
Jan 24, 2018·ACS Applied Materials & Interfaces·Doh-Gyu HwangMichael D Bartlett
May 26, 2020·ACS Applied Materials & Interfaces·Amir Mohammadi NasabWanliang Shan

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