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

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

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Authors

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

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Original languageEnglish
Pages (from-to)8873-8884
Number of pages12
JournalJournal of Physical Chemistry A
Volume116
Issue number35
Early online date6 Aug 2012
DOIs
StatePublished - 6 Sep 2012

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.

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