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Precision charging of microparticles in plasma via the Rayleigh instability for evaporating charged liquid droplets

Bennet, E.D., Mahony, CMO, Potts, H.E., Everest, P., Rutherford, D., Askari, S., McDowell, Da, Mariotti, D, Kelsey, C., Perez-Martin, F., Hamilton, N., Maguire, P and Diver, D.A. (2016) Precision charging of microparticles in plasma via the Rayleigh instability for evaporating charged liquid droplets. Journal of Aerosol Science, 100 . 53 - 60. [Journal article]

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URL: http://www.sciencedirect.com/science/article/pii/S0021850216300428

DOI: 10.1016/j.jaerosci.2016.05.002

Abstract

Abstract In this paper we describe a novel method for delivering a precise, known amount of electric charge to a micron-sized solid target. Aerosolised microparticles passed through a plasma discharge will acquire significant electric charge. The fluid stability under evaporative stress is a key aspect that is core to the research. Initially stable charged aerosols subject to evaporation (i.e. a continually changing radius) may encounter the Rayleigh stability limit. This limit arises from the electrostatic and surface tension forces and determines the maximum charge a stable droplet can retain, as a function of radius. We demonstrate that even if the droplet charge is initially much less than the Rayleigh limit, the stability limit will be encountered as the droplet evaporates. The instability emission mechanism is strongly linked to the final charge deposited on the target, providing a mechanism that can be used to ensure a predictable charge deposit on a known encapsulated microparticle.

Item Type:Journal article
Keywords:Electrostatics
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:34861
Deposited By: Professor Davide Mariotti
Deposited On:27 Jun 2016 11:33
Last Modified:17 Oct 2017 16:23

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