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Issue 43, 2017
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pH-responsive superomniphobic nanoparticles as versatile candidates for encapsulating adhesive liquid marbles

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Abstract

Conventional adhesives are rarely used 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 (siloxane polymer) liquids via wrapping them with superomniphobic nanoparticles. The free energy for marble formation is lower for a hydrophobic liquid (0.931 × 10−16 J), whereas a hydrophilic liquid registers a higher value of 1.86 × 10−16 J. The mechanical bursting energy for hydrophobic marbles (20 μJ) is lower than that for their hydrophilic counterpart (48.6 μJ). The static friction coefficients of epoxy-based liquid marble are between 0.015 and 0.020 on glass, aluminium and stainless steel substrates. As a highlight, the nanoparticle coating is responsive to pH, and the bursting time of the liquid marbles can be tuned from <1 minute to several hours. It is demonstrated that the adhesive strength of cross-linked epoxy obtained by a liquid marble route is higher than that obtained vis-a-vis a conventional wetting route. The liquid marbles presented in this work can be ruptured by changing the pH, have a lower friction coefficient compared to the bare liquids (more rolling distance, which is highly essential for bonding of an intricate space from a distance) and are useful as dry adhesives.

Graphical abstract: pH-responsive superomniphobic nanoparticles as versatile candidates for encapsulating adhesive liquid marbles

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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, 2017,5, 22813-22823
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    pH-responsive superomniphobic nanoparticles as versatile candidates for encapsulating adhesive liquid marbles

    S. Chandan, S. Ramakrishna, K. Sunitha, M. S. Chandran, K. S. S. Kumar and D. Mathew, J. Mater. Chem. A, 2017, 5, 22813
    DOI: 10.1039/C7TA07562F

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