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Structural morphology of acoustically levitated and heated nanosilica droplet

Kumar, Ranganathan and Tijerino, Erick and Saha, Abhishek and Basu, Saptarshi (2010) Structural morphology of acoustically levitated and heated nanosilica droplet. In: Applied Physics Letters, 97 (12).

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We study the vaporization and precipitation dynamics of a nanosilica encapsulated water droplet by levitating it acoustically and heating it with a CO2 laser. For all concentrations, we observe three phases: solvent evaporation, surface agglomeration, and precipitation leading to bowl or ring shaped structures. At higher concentrations, ring reorientation and rotation are seen consistently. The surface temperature from an infrared camera is seen to be dependent on the final geometrical shape of the droplet and its rotation induced by the acoustic field of the levitator. With nonuniform particle distribution, these structures can experience rupture which modifies the droplet rotational speed. (C) 2010 American Institute of Physics. doi:10.1063/1.3493178]

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Keywords: acoustic wave effects; drops; evaporation; heat treatment; laser beam effects; liquid structure; nanofluidics; nanostructured materials; precipitation; rotational flow; silicon compounds; surface tension
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 03 Jan 2011 07:07
Last Modified: 03 Jan 2011 07:07
URI: http://eprints.iisc.ac.in/id/eprint/34766

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