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J Colloid Interface Sci. 2013 Apr 1;395:287-93. doi: 10.1016/j.jcis.2012.11.037. Epub 2012 Dec 5.

Imaging internal flows in a drying sessile polymer dispersion drop using Spectral Radar Optical Coherence Tomography (SR-OCT).

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  • 1Technische Universit√§t Darmstadt, Institute of Fluid Mechanics and Aerodynamics, Darmstadt, Germany. manukyan@csi.tu-darmstadt.de

Abstract

In this work, we present the visualization of the internal flows in a drying sessile polymer dispersion drop on hydrophilic and hydrophobic surfaces with Spectral Radar Optical Coherence Tomography (SR-OCT). We have found that surface features such as the initial contact angle and pinning of the contact line, play a crucial role on the flow direction and final shape of the dried drop. Moreover, imaging through selection of vertical slices using optical coherence tomography offers a feasible alternative compared to imaging through selection of narrow horizontal slices using confocal microscopy for turbid, barely transparent fluids.

PMID:
23295027
DOI:
10.1016/j.jcis.2012.11.037
[PubMed]
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