
Proceedings Paper
Analysis of optical trap mediated aerosol coalescenceFormat | Member Price | Non-Member Price |
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Paper Abstract
The use of optical tweezers for the analysis of aerosols is valuable for understanding the dynamics of atmospherically
relevant particles. However to be able to make accurate measurements that can be directly tied to real-world phenomena
it is important that we understand the influence of the optical trap on those processes. One process that is seemingly
straightforward to study with these techniques is binary droplet coalescence, either using dual beam traps, or by particle
collision with a single trapped droplet. This binary coalescence is also of interest in many other processes that make use
of dense aerosol sprays such as spray drying and the use of inhalers for drug delivery in conditions such as asthma or hay
fever. In this presentation we discuss the use of high speed (~5000 frames per second) video microscopy to track the
dynamics of particles as they approach and interact with a trapped aqueous droplet and develop this analysis further by
considering elastic light scattering from droplets as they undergo coalescence. We find that we are able to characterize
the re-equilibration time of droplets of the same phase after they interact and that the trajectories taken by airborne
particles influenced by an optical trap are often quite complex. We also examine the role of parameters such as the salt
concentration of the aqueous solutions used and the influence of laser wavelength.
Paper Details
Date Published: 10 October 2012
PDF: 7 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 84582B (10 October 2012); doi: 10.1117/12.946593
Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)
PDF: 7 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 84582B (10 October 2012); doi: 10.1117/12.946593
Show Author Affiliations
N. S. Mistry, Univ. of Leicester (United Kingdom)
R. Power, Univ. of Bristol (United Kingdom)
S. Anand, Univ. of Dundee (United Kingdom)
D. McGloin, Univ. of Dundee (United Kingdom)
R. Power, Univ. of Bristol (United Kingdom)
S. Anand, Univ. of Dundee (United Kingdom)
D. McGloin, Univ. of Dundee (United Kingdom)
A. Almohamedi, Univ. of Leicester (United Kingdom)
M. Downie, Univ. of Leicester (United Kingdom)
J. P. Reid, Univ. of Bristol (United Kingdom)
A. J. Hudson, Univ. of Leicester (United Kingdom)
M. Downie, Univ. of Leicester (United Kingdom)
J. P. Reid, Univ. of Bristol (United Kingdom)
A. J. Hudson, Univ. of Leicester (United Kingdom)
Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)
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