Walton, F. and Wynne, K. (2019) Using optical tweezing to control phase separation and nucleation near a liquid–liquid critical point. Soft Matter, 15(41), pp. 8279-8289. (doi: 10.1039/C9SM01297D) (PMID:31603454)
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Abstract
About 20 years ago, it was shown that lasers can nucleate crystals in super-saturated solutions and might even be able to select the polymorph that crystallises. However, no theoretical model was found explaining the results and progress was slowed down. Here we show that laser-induced nucleation may be understood in terms of the harnessing of concentration fluctuations near a liquid–liquid critical point using optical tweezing in a process called laser-induced phase separation (LIPS) and LIPS and Nucleation (LIPSaN). A theoretical model is presented based on the regular solution model with an added term representing optical tweezing while the dynamics are modelled using a Kramers diffusion equation, and the roles of heat diffusion and thermophoresis are evaluated. LIPS and LIPSaN experiments were carried out on a range of liquid mixtures and the results compared to theory.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Walton, Mr Finlay and Wynne, Professor Klaas |
| Authors: | Walton, F., and Wynne, K. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Soft Matter |
| Publisher: | Royal Society of Chemistry |
| ISSN: | 1744-683X |
| ISSN (Online): | 1744-6848 |
| Published Online: | 04 October 2019 |
| Copyright Holders: | Copyright © 2019 The Authors |
| First Published: | First published in Soft Matter 15(41): 8279-8289 |
| Publisher Policy: | Reproduced under a Creative Commons license |
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