Electrospray characterization based on an emitter on cone-shaped porous medium for the high-throughput microliter aerosol generation

Title
Electrospray characterization based on an emitter on cone-shaped porous medium for the high-throughput microliter aerosol generation
Authors
정재희변찬구숙희이우종김우진
Keywords
Capillary action; Cone-jet mode; Electrospray; Porous medium; Spray stability
Issue Date
2017-09
Publisher
Applied physics letters
Citation
VOL 111, NO 12-123504-5
Abstract
A compact electrospray system has been developed using a cone-shaped porous medium. The cone-jet conditions with a stable spraying mode were measured using ethanol and lavender oil, and the average diameter and size distribution of the sprayed droplets were investigated according to the applied voltage. In addition, the spray stability over time was analyzed because the fluid was supplied with a capillary action without the use of a pump. The average diameter of the droplets was 3.6– 6.7 lm (ethanol) and 6.4– 8.6 lm (lavender oil). We observed that the average particle size clearly increased with the applied voltage; the cause was determined based on the electric stress due to the potential difference (“electric pressure”) between the tip of the porous medium and ground ring. Moreover, the mean droplet size according to the electrical potential was proportional to E0.5 (ethanol) and E0.85 (lavender oil). The penetration time in the porous medium of the proposed system was controlled by the physical properties of the fluid, such as surface tension and viscosity, and affected the spray stability when spraying for a long time. Thus, the spray stability could be improved by controlling the applied voltage in the cone-jet mode region.
URI
http://pubs.kist.re.kr/handle/201004/66582
ISSN
0003-6951
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KIST Publication > Article
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