Optical measurements from single levitated particles using a linear electrodynamic quadrupole trap

We have recently made advancements in a linear electrodynamic quadrupole (LEQ) device for capturing and levitating either single or multiple micro-particles that provides significant improvements in capture efficiency, reliability, and optical measurement access. We have used our LEQ to trap particl...

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Bibliographic Details
Published in:Applied optics (2004) 2015-11, Vol.54 (31), p.F174-F181
Main Authors: Hart, Matthew B, Sivaprakasam, Vasanthi, Eversole, Jay D, Johnson, Lee J, Czege, Jozsef
Format: Article
Language:English
Subjects:
Aerosols
Droplets
Electrodynamics
Glycerols
Optical measurement
Platforms
Quadrupoles
Relative humidity
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Summary:We have recently made advancements in a linear electrodynamic quadrupole (LEQ) device for capturing and levitating either single or multiple micro-particles that provides significant improvements in capture efficiency, reliability, and optical measurement access. We have used our LEQ to trap particles ranging from 30 to less than 0.5 μm in size and provide a controlled environment to study particle physical/chemical dependencies on temperature, relative humidity, and gas constituents. To demonstrate this approach, we present data and analysis of liquid-droplet evaporation rates for two materials: glycerol and dibutyl sebacate. Droplet size was monitored as a function of time by two independent optical methods: direct imaging and fixed-angle light scattering. This new approach provides a means to rapidly characterize a wide range of aerosol particle properties and a platform for development of new aerosol optical-diagnostic measurements.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.54.00F174