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

Ta Van Duong, Richard Carter, Emre Esenturk, Colm Connaughton, Thomas J. Wasley, J. Li, Robert W. Kay, Jonathan Stringer, P. J. Smith, Jonathan D Shephard

Research output: Contribution to journalArticle

9 Citations (Scopus)
71 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)4530-4536
Number of pages7
JournalSoft Matter
Volume12
Issue number20
Early online date4 Apr 2016
DOIs
Publication statusPublished - 28 May 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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