Miglani, Ankur and Basu, Saptarshi (2015) Sphere to ring morphological transformation in drying nanofluid droplets in a contact-free environment. In: SOFT MATTER, 11 (11). pp. 2268-2278.
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Abstract
Understanding the transients of buckling in drying colloidal suspensions is pivotal for producing new functional microstructures with tunable morphologies. Here, we report first observations and elucidate the buckling instability induced morphological transition (sphere to ring structure) in an acoustically levitated, heated nanosuspension droplet using dynamic energy balance. Droplet deformation featuring the formation of symmetric cavities is initiated by capillary pressure that is two to three orders of magnitude greater than the acoustic radiation pressure, thus indicating that the standing pressure field has no influence on the buckling front kinetics. With an increase in heat flux, the growth rate of surface cavities and their post-buckled volume increase while the buckling time period reduces, thereby altering the buckling pathway and resulting in distinct precipitate structures. However, irrespective of the heating rate, the volumetric droplet deformation exhibits a linear time dependence and the droplet vaporization is observed to deviate from the classical D-2-law.
| Item Type: | Journal Article |
|---|---|
| Publication: | SOFT MATTER |
| Publisher: | ROYAL SOC CHEMISTRY |
| Additional Information: | Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND |
| Keywords: | ACOUSTICALLY LEVITATED DROPLETS; COLLOIDAL DROPLETS; INVAGINATION PROCESS; EVAPORATION; NANOPARTICLES; DESICCATION; SHELLS; DROPS |
| Department/Centre: | Division of Mechanical Sciences > Mechanical Engineering |
| Date Deposited: | 21 Apr 2015 07:21 |
| Last Modified: | 21 Apr 2015 07:21 |
| URI: | http://eprints.iisc.ac.in/id/eprint/51329 |
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