Issue 11, 2015

Sphere to ring morphological transformation in drying nanofluid droplets in a contact-free environment

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 D2-law.

Graphical abstract: Sphere to ring morphological transformation in drying nanofluid droplets in a contact-free environment

Article information

Article type
Paper
Submitted
18 Nov 2014
Accepted
21 Jan 2015
First published
22 Jan 2015

Soft Matter, 2015,11, 2268-2278

Author version available

Sphere to ring morphological transformation in drying nanofluid droplets in a contact-free environment

A. Miglani and S. Basu, Soft Matter, 2015, 11, 2268 DOI: 10.1039/C4SM02553A

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