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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.
Original language | English |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 8458 |
DOIs | |
Publication status | Published - 1 Dec 2012 |
Event | Optical Trapping and Optical Micromanipulation IX - San Diego Convention Center, San Diego, CA, United States Duration: 12 Aug 2012 → 16 Aug 2012 |
Conference
Conference | Optical Trapping and Optical Micromanipulation IX |
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Country/Territory | United States |
City | San Diego, CA |
Period | 12/08/12 → 16/08/12 |
Keywords
- Aerosols
- Coalescence
- Droplets
- High-speed imaging
- Light scattering
- Optical tweezers
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Dive into the research topics of 'Analysis of optical trap mediated aerosol coalescence'. Together they form a unique fingerprint.Projects
- 1 Finished
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NEW STRATEGIES FOR SAMPLING, ANALYSING AND UNDERSTANDING AEROSOLS
Reid, J. P. (Principal Investigator)
1/03/09 → 1/09/14
Project: Research