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Issue 20, 2016
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Dynamically controlled deposition of colloidal nanoparticle suspension in evaporating drops using laser radiation

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Abstract

Dynamic control of the distribution of polystyrene suspended nanoparticles in evaporating droplets is investigated using a 2.9 μm high power laser. Under laser radiation a droplet is locally heated and fluid flows are induced that overcome the capillary flow, and thus a reversal of the coffee-stain effect is observed. Suspension particles are accumulated in a localised area, one order of magnitude smaller than the original droplet size. By scanning the laser beam over the droplet, particles can be deposited in an arbitrary pattern. This finding raises the possibility for direct laser writing of suspended particles through a liquid layer. Furthermore, a highly uniform coating is possible by manipulating the laser beam diameter and exposure time. The effect is expected to be universally applicable to aqueous solutions independent of solutes (either particles or molecules) and deposited substrates.

Graphical abstract: Dynamically controlled deposition of colloidal nanoparticle suspension in evaporating drops using laser radiation

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Supplementary files

Article information


Submitted
22 Feb 2016
Accepted
04 Apr 2016
First published
04 Apr 2016

This article is Open Access

Soft Matter, 2016,12, 4530-4536
Article type
Paper
Author version available

Dynamically controlled deposition of colloidal nanoparticle suspension in evaporating drops using laser radiation

V. D. Ta, R. M. Carter, E. Esenturk, C. Connaughton, T. J. Wasley, J. Li, R. W. Kay, J. Stringer, P. J. Smith and J. D. Shephard, Soft Matter, 2016, 12, 4530
DOI: 10.1039/C6SM00465B

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