Mampallil, D., Reboud, J. , Wilson, R. , Wylie, D., Klug, D. and Cooper, J. (2015) Acoustic suppression of the coffee-ring effect. [Data Collection]
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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.
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| 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/ |
| URI: | https://researchdata.gla.ac.uk/id/eprint/198 |
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