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Controlled microdroplet transport in an atmospheric pressure microplasma

Maguire, Paul, Mahony, CMO, Kelsey, Colin, Bingham, AJ, Montgomery, EP, Bennet, ED, Potts, HE, Rutherford, DCE, McDowell, D A, Diver, DA and Mariotti, D (2015) Controlled microdroplet transport in an atmospheric pressure microplasma. Applied Physics Letters, 106 . p. 224101. [Journal article]

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DOI: http://dx.doi.org/10.1063/1.4922034

Abstract

We report the controlled injection of near-isolated micron-sized liquid droplets into a low temperature He-Ne steady-state rf plasma at atmospheric pressure. The H2O droplet stream is constrained within a 2 mm diameter quartz tube. Imaging at the tube exit indicates a log-normal droplet size distribution with an initial count mean diameter of 15lm falling to 13lm with plasma exposure. The radial velocity profile is approximately parabolic indicating near laminar flow conditions with the majority of droplets travelling at>75% of the local gas speed and having a plasma transit time of<100ls. The maximum gas temperature, determined from nitrogen spectral lines, was below 400 K and the observed droplet size reduction implies additional factors beyond standard evaporation, including charge and surface chemistry effects. The demonstration of controlled microdroplet streams opens up possibilities for gas-phase microreactors and remote delivery of active species for plasma medicine.

Item Type:Journal article
Keywords:Atmospheric pressure plasmas
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Life and Health Sciences
Faculty of Computing & Engineering > School of Engineering
Faculty of Life and Health Sciences > School of Health Sciences
Research Institutes and Groups:Engineering Research Institute
Biomedical Sciences Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:31769
Deposited By: Professor Paul Maguire
Deposited On:08 Jun 2015 12:47
Last Modified:17 Oct 2017 16:18

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