Abbreviated Journal Title
Appl. Phys. Lett.
acoustic wave effects; drops; evaporation; heat treatment; laser beam; effects; liquid structure; nanofluidics; nanostructured materials; precipitation; rotational flow; silicon compounds; surface tension; FLOW; Physics, Applied
We study the vaporization and precipitation dynamics of a nanosilica encapsulated water droplet by levitating it acoustically and heating it with a CO(2) 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.
Applied Physics Letters
Kumar, Ranganathan; Tijerino, Erick; Saha, Abhishek; and Basu, Saptarshi, "Structural morphology of acoustically levitated and heated nanosilica droplet" (2010). Faculty Bibliography 2010s. 393.