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    Rechargeable Aqueous Microdroplet

    200651_200651.pdf (1.445Mb)
    Access Status
    Open access
    Authors
    Phan, Chi
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Phan, C. 2014. Rechargeable Aqueous Microdroplet. The Journal of Physical Chemistry Letters. 5 (8): pp. 1463-1466.
    Source Title
    The Journal of Physical Chemistry Letters
    DOI
    10.1021/jz500556n
    ISSN
    1948-7185
    School
    Department of Chemical Engineering
    Remarks

    Copyright © 2014 American Chemical Society. This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

    URI
    http://hdl.handle.net/20.500.11937/38347
    Collection
    • Curtin Research Publications
    Abstract

    Directional and controllable transportation of microdroplets is critical for emerging micro- and nanotechnology, in which the conventional mechanical energy generation is not applicable. This Letter shows that an aqueous microdroplet can be charged for controlled motion in electrostatic potential, which was created by differentiating pH, between two oil/water interfaces. The directional motion of the droplet, <100 micro-meters in diameter, was obtained with a constant velocity of ~1 mm/s. The force analysis showed that the droplet surface was charged and recharged oppositely byion transfer through interfacial layers, without significant mass transfer. The charging and recharging cycles were recorded continuously with a single droplet over 100 times. The energy for motion was generated from pH neutralization, which is the simplest aqueous reaction. This is the first time that the phenomenon is reported. The phenomenon can be employed as an efficient and robust method to convert chemical to mechanical energy for miniaturized devices and microprocesses.

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