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  • Transient Solubility Gradients Mediate Oversaturation during Solvent Exchange

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    An497469-Accepted.pdf (379.7Kb)
    File version
    Accepted Manuscript (AM)
    Author(s)
    Tan, Beng Hau
    Ohl, Claus-Dieter
    An, Hongjie
    Griffith University Author(s)
    An, Hongjie
    Year published
    2021
    Metadata
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    Abstract
    Solvent exchange facilitates high-density nucleation of sessile nanodroplets or nanobubbles by successively wetting a surface with two solvents of contrasting solubility with respect to a target species. Yet the key physical mechanisms underlying its efficacy have yet to be theoretically explained. We develop a minimal model for solvent exchange, for the prototypical example of water and ethanol as the solvents and nitrogen as the target species. Our calculations show that solvent exchange is mediated by transient solubility gradients that dominate over the intrinsic concentration gradient of nitrogen in the incipient moments ...
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    Solvent exchange facilitates high-density nucleation of sessile nanodroplets or nanobubbles by successively wetting a surface with two solvents of contrasting solubility with respect to a target species. Yet the key physical mechanisms underlying its efficacy have yet to be theoretically explained. We develop a minimal model for solvent exchange, for the prototypical example of water and ethanol as the solvents and nitrogen as the target species. Our calculations show that solvent exchange is mediated by transient solubility gradients that dominate over the intrinsic concentration gradient of nitrogen in the incipient moments after exchange. Solubility gradients advect nitrogen toward the substrate during ethanol-water exchange but away from it in water-ethanol exchange, consistent with the directionality observed in experiments.
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    Journal Title
    Physical Review Letters
    Volume
    126
    Issue
    23
    DOI
    https://doi.org/10.1103/physrevlett.126.234502
    Funder(s)
    ARC
    Grant identifier(s)
    FT180100361
    Copyright Statement
    © 2021 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Mathematical sciences
    Physical sciences
    Condensed matter physics
    Engineering
    Publication URI
    http://hdl.handle.net/10072/405078
    Collection
    • Journal articles

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