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    Soft colloidal probes for AFM force measurements between water droplets in oil

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    Type
    Article
    Authors
    Vakarelski, Ivan Uriev cc
    Li, Erqiang cc
    Thoroddsen, Sigurdur T cc
    KAUST Department
    Clean Combustion Research Center
    High-Speed Fluids Imaging Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014-11
    Permanent link to this record
    http://hdl.handle.net/10754/575721
    
    Metadata
    Show full item record
    Abstract
    Here we introduce an extension of the atomic force microscopy (AFM) colloidal probe technique, as a simple and reliable experimental approach to measure the interaction forces between small water droplets (~80-160. μm) dispersed in oil. Small water droplets are formed by capillary breakup of a microscale water jet in air, which is forced out of a fine capillary nozzle, and deposited on a superhydrophobic substrate immersed in tetradecane oil medium. In these conditions the water droplets are very loosely attached to the superhydrophobic substrate and are easily picked up with a hydrophobic AFM cantilever to form a soft colloidal probe. Sample force measurements are conducted to demonstrate the capability of the technique.
    Sponsors
    Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). Most of the experiments were conducted in KAUST Microfluidics Thrust Area Labs.
    Publisher
    Elsevier BV
    Journal
    Colloids and Surfaces A: Physicochemical and Engineering Aspects
    DOI
    10.1016/j.colsurfa.2014.09.028
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.colsurfa.2014.09.028
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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