
Proceedings Paper
Probing the bulk viscosity of particles using aerosol optical tweezersFormat | Member Price | Non-Member Price |
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Paper Abstract
Holographic aerosol optical tweezers can be used to trap arrays of aerosol particles allowing detailed studies of
particle properties and processes at the single particle level. Recent observations have suggested that secondary
organic aerosol may exist as ultra-viscous liquids or glassy states at low relative humidity, potentially a
significant factor in influencing their role in the atmosphere and their activation to form cloud droplets. A
decrease in relative humidity surrounding a particle leads to an increased concentration of solute in the droplet
as the droplet returns to equilibrium and, thus, an increase in the bulk viscosity. We demonstrate that the
timescales for condensation and evaporation processes correlate with particle viscosity, showing significant
inhibition in mass transfer kinetics using ternary sucrose/sodium chloride/water droplets as a proxy to
atmospheric multi-component aerosol. We go on to study the fundamental process of aerosol coagulation in
aerosol particle arrays, observing the relaxation of non-spherical composite particles formed on coalescence.
We demonstrate the use of bright-field imaging and elastic light scattering to make measurements of the
timescale for the process of binary coalescence contrasting the rheological properties of aqueous sucrose and
sodium chloride aerosol over a range of relative humidities.
Paper Details
Date Published: 10 October 2012
PDF: 10 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 845829 (10 October 2012); doi: 10.1117/12.931655
Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)
PDF: 10 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 845829 (10 October 2012); doi: 10.1117/12.931655
Show Author Affiliations
Jonathan P. Reid, Univ. of Bristol (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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