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Liquid Interfaces with pH-switchable Nanoparticle Arrays

Abstract

Stimuli-responsive 2D nanoscale systems offer intriguing opportunities for creating switchable interfaces. At liquid interfaces, such systems can provide a control over interfacial energies, surface structure, 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 pH-responsive membrane formed from gold nanoparticles grafted with DNA (DNA-NPs) at a liquid-vapor interface. DNA-NPs 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 a surface area.

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Publication details

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, Accepted Manuscript
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    Liquid Interfaces with pH-switchable Nanoparticle Arrays

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

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