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Dynamic measurements and simulations of airborne picolitre-droplet coalescence in holographic optical tweezers
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Bzdek, Bryan, Collard, Liam, Sprittles, James E., Hudson, Andrew and Reid, Jonathan (2016) Dynamic measurements and simulations of airborne picolitre-droplet coalescence in holographic optical tweezers. Journal of Chemical Physics, 145 (5). 054502 . doi:10.1063/1.4959901 ISSN 0021-9606.
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WRAP_Dynamic Measurements and Simulations of Airborne Picolitre-Droplet Coalescence in Holographic Optical Tweezers.pdf - Accepted Version Embargoed item. Restricted access to Repository staff only - Requires a PDF viewer. Download (6Mb) |
Official URL: http://dx.doi.org/10.1063/1.4959901
Abstract
We report studies of the coalescence of pairs of picolitre aerosol droplets manipulated with holographic optical tweezers, probing the shape relaxation dynamics following coalescence by simultaneously monitoring the intensity of elastic backscattered light (EBL) from the trapping laser beam (time resolution on the order of 100 ns) while recording high frame rate camera images (time resolution <10 µs). The goals of this work are to: resolve the dynamics of droplet coalescence in holographic optical traps; assign the origin of key features in the time-dependent EBL intensity; and validate the use of the EBL alone to precisely determine droplet surface tension and viscosity. For low viscosity droplets, two sequential processes are evident: binary coalescence first results from overlap of the optical traps on the timescale of microseconds followed by recapture of the composite droplet in an optical trap on the timescale of milliseconds. As droplet viscosity increases, the relaxation in droplet shape eventually occurs on the same timescale as recapture, resulting in a convoluted evolution of the EBL intensity that inhibits quantitative determination of the relaxation timescale. Droplet coalescence was simulated using a computational framework to validate both experimental approaches. The results indicate that time-dependent monitoring of droplet shape from the EBL potential of high frame rate imaging to examine the coalescence of dissimilar viscosity droplets is discussed.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | ||||||
Library of Congress Subject Headings (LCSH): | Drops -- Viscosity , Drops -- Surfaces | ||||||
Journal or Publication Title: | Journal of Chemical Physics | ||||||
Publisher: | American Institute of Physics | ||||||
ISSN: | 0021-9606 | ||||||
Official Date: | August 2016 | ||||||
Dates: |
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Volume: | 145 | ||||||
Number: | 5 | ||||||
Article Number: | 054502 | ||||||
DOI: | 10.1063/1.4959901 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 21 July 2016 | ||||||
Date of first compliant Open Access: | 3 May 2017 | ||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||
Grant number: | EP/L010569/1, EP/N016602/1 | ||||||
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