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Issue 19, 2018
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Liquid interfaces with pH-switchable nanoparticle arrays

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Stimuli-responsive 2D nanoscale systems offer intriguing opportunities for creating switchable interfaces. At liquid interfaces, such systems can provide control over interfacial energies, surface structure, and rheological and transport characteristics, which is relevant, for example, to bio- and chemical reactors, microfluidic devices, and soft robotics. Here, we explore the formation of a pH-responsive membrane formed from gold nanoparticles grafted with DNA (DNA–NPs) at a liquid–vapor interface. A DNA–NP 2D hexagonal lattice can be reversibly switched by pH modulation between an expanded state of non-connected nanoparticles at neutral pH and a contracted state of linked nanoparticles at acidic pH due to the AH+–H+A base pairing between A-motifs. Our in situ surface X-ray scattering studies reveal that the reversible lattice contraction can be tuned by the length of pH-activated linkers, with up to ∼71% change in surface area.

Graphical abstract: Liquid interfaces with pH-switchable nanoparticle arrays

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The article was received on 20 Mar 2018, accepted on 16 Apr 2018 and first published on 16 Apr 2018

Article type: Paper
DOI: 10.1039/C8SM00583D
Citation: Soft Matter, 2018,14, 3929-3934
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    Liquid interfaces with pH-switchable nanoparticle arrays

    S. Srivastava, M. Fukuto and O. Gang, Soft Matter, 2018, 14, 3929
    DOI: 10.1039/C8SM00583D

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