Acoustic suppression of the coffee-ring effect.

Mampallil, D. and Reboud, J. and Wilson, R. and Wylie, D. and Klug, D. and Cooper, J. M. (2015) Acoustic suppression of the coffee-ring effect. [Data Collection]

Enlighten Publications URI: http://eprints.gla.ac.uk/id/eprint/109007

Collection description

We study the influence of acoustic fields on the evaporative self-assembly of solute particles suspended inside sessile droplets of complex fluids. The self-assembly process often results in an undesirable ring-like heterogeneous residue, a phenomenon known as the coffee-ring effect. Here we show that this ring-like self-assembly can be controlled acoustically to form homogeneous disc-like or concentrated spot-like residues. The principle of our method lies in the formation of dynamic patterns of particles in acoustically excited droplets, which inhibits the evaporation-driven convective transport of particles towards the contact line. We elucidate the mechanisms of this pattern formation and also obtain conditions for the suppression of the coffee-ring effect. Our results provide a more general solution to suppress the coffee-ring effect without any physiochemical modification of the fluids, the particles or the surface, thus potentially useful in a broad range of industrial and analytical applications that require homogenous solute depositions.

College / School: College of Science and Engineering > School of Engineering > Biomedical Engineering
Date Deposited: 30 Jun 2015 12:28
Enlighten Publications URL: http://eprints.gla.ac.uk/109007/
Retention date: 20 July 2025
Funder's Name: Engineering & Physical Sciences Research Council (EPSRC), Engineering & Physical Sciences Research Council (EPSRC)
URI: http://researchdata.gla.ac.uk/id/eprint/198

Available Files

Data

Read me

Repository Staff Only: Update this record

Mampallil, D. and Reboud, J. and Wilson, R. and Wylie, D. and Klug, D. and Cooper, J. M. (2015); Acoustic suppression of the coffee-ring effect.

University of Glasgow

10.5525/gla.researchdata.198

Retrieved: 2017-11-18

Downloads

Downloads per month over past year