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Charged droplet dynamics in the submicrometer size range.

Christopher J Hogan1, Pratim Biswas, Da-ren Chen

  • 1Department of Energy, Washington University, St. Louis, Missouri, USA. christopher.hogan@yale.edu

The Journal of Physical Chemistry. B
|January 23, 2009
PubMed
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Highly charged electrosprayed droplets lose charge differently depending on size. Droplets larger than 40 nm undergo Coulombic fission, while smaller ones emit ions, a key finding for mass spectrometry.

Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Aerosol Science

Background:

  • Electrospray produces highly charged droplets crucial for mass spectrometry.
  • Mechanisms of charge loss in submicrometer droplets remain poorly understood.

Purpose of the Study:

  • To investigate charge loss dynamics in submicrometer electrosprayed droplets.
  • To identify the transition in charge loss mechanisms with droplet size.

Main Methods:

  • Tandem Differential Mobility Analysis (TDMA) of aerosol particles from evaporated droplets.
  • Bayesian data inversion to compare experimental mobility spectra with theoretical models.

Main Results:

  • A size-dependent transition in charge loss mechanisms was observed around 40 nm.

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Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets
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  • Larger droplets ( > 40 nm) lost charge via Coulombic fission at the Rayleigh limit.
  • Smaller droplets (10-40 nm) lost charge via ion emission, maintaining a constant surface electric field.

    • Conclusions:

    • This study provides the first experimental evidence of a transition in electrosprayed droplet charge loss mechanisms.
    • Findings bridge the gap between micrometer-sized and nanometer-sized charged droplet studies.
    • Results align with theoretical predictions for ion-emitting nanodroplets.