Observation of the binary coalescence and equilibration of micrometer-sized droplets of aqueous aerosol in a single-beam gradient-force optical trap

R. Power, J. P. Reid, S. Anand, D. McGloin, A. Almohamedi, N. S. Mistry, A. J. Hudson

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    14 Citations (Scopus)

    Abstract

    The binary coalescence of aqueous droplets has been observed in a single-beam gradient-force optical trap. By measuring the time-dependent intensity for elastic scattering of light from the trapping laser, the dynamics of binary coalescence have been examined and the time scale for equilibration of a composite droplet to ambient conditions has been determined. These data are required for modeling the agglomeration of aqueous droplets in dense sprays and atmospheric aerosol. Elastic-light scattering from optically trapped particles has not been used previously to study the time-resolved dynamics of mixing. It is shown to offer a unique opportunity to characterize the binary coalescence of aqueous droplets with radii from 1 to 6 µm. The study of this size regime, which cannot be achieved by conventional imaging methods, is critical for understanding the interactions of droplets in the environment of dense sprays.
    Original languageEnglish
    Pages (from-to)8873-8884
    Number of pages12
    JournalJournal of Physical Chemistry A
    Volume116
    Issue number35
    Early online date6 Aug 2012
    DOIs
    Publication statusPublished - 6 Sep 2012

    Keywords

    • Ambient conditions
    • Aqueous aerosols
    • Aqueous droplets
    • Conventional imaging
    • Dense sprays
    • Optical trap
    • Single-beam
    • Time-dependent
    • Time-resolved dynamics
    • Time-scales
    • Trapped particle
    • Trapping laser

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