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pH-responsive Superomniphobic Nanoparticles as Versatile Entrant for Encapsulating Adhesive Liquid Marbles

Abstract

Conventional adhesives face obscurity in sophisticated applications such as micro-fluidic devices or ‘operations of bonding from a distance’ due to their permanent wetting characteristics. Liquid marbles offer exceptional switching between non-wetting and wetting on demand. In this contribution, we present a novel approach to encapsulate both hydrophilic (epoxy resin) and hydrophobic liquids (siloxane polymer) via wrapping superomniphobic nanoparticles over them. Free energy for marble formation is less for hydrophobic liquid (0.931 x 10-16 J) whereas hydrophilic liquid registered a higher value of 1.86 x 10-16 J. Mechanical bursting energy for hydrophobic marbles (20 µJ) is lower than hydrophilic counterparts (48.6 µJ). The static friction coefficient of epoxy based liquid marble is between 0.015-0.020 on glass, aluminium and stainless steel substrates. To the highlight, the nanoparticle coating is responsive towards pH and bursting time of liquid marbles can be tuned from < 1 minute to several hours. It is demonstrated that adhesive strength of cross-linked epoxy by liquid marble route is higher vis-a-vis conventional wetting route. The liquid marbles presented in this work are rupture-able by changing pH, lower in friction coefficient compared to bare liquid (more rolling distance, highly essential for bonding of an intricate space from a distance) and useful as dry-adhesives.

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Publication details

The article was received on 27 Aug 2017, accepted on 12 Oct 2017 and first published on 12 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07562F
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    pH-responsive Superomniphobic Nanoparticles as Versatile Entrant for Encapsulating Adhesive Liquid Marbles

    C. S, R. Sukamanchi, S. K, S. Chandran, S. K. S. Kumar and D. Mathew, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07562F

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