Mampallil, D., Reboud, J. , Wilson, R. , Wylie, D., Klug, D. R. and Cooper, J. M. (2015) Acoustic control of evaporative colloidal self-assembly: suppression of the coffee-ring effect. Soft Matter, 11(36), pp. 7207-7213. (doi: 10.1039/c5sm01196e)
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Abstract
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.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Mampallil Augustine, Dr Dileep and Wilson, Dr Robert and Cooper, Professor Jonathan and Reboud, Professor Julien |
| Authors: | Mampallil, D., Reboud, J., Wilson, R., Wylie, D., Klug, D. R., and Cooper, J. M. |
| College/School: | College of Science and Engineering > School of Engineering > Biomedical Engineering |
| Journal Name: | Soft Matter |
| Publisher: | Royal Society of Chemistry |
| ISSN: | 1744-683X |
| ISSN (Online): | 1744-6848 |
| Copyright Holders: | Copyright © 2015 The Authors |
| First Published: | First published in Soft Matter 11(36):7207-7213 |
| Publisher Policy: | Reproduced under a Creative Commons License |
| Data DOI: | 10.5525/gla.researchdata.198 |
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