Forces Acting on a Single Particle in an Evaporating Sessile Droplet on a Hydrophilic Surface

The evaporating sessile droplet of a mono/didisperse colloid on a plate is a very useful and handy technique in micro/nano/bioapplications to separate, pattern, and control the particles. Although the fundamental nature of the evaporation phenomena and its applications have been extensively proposed...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2010-02, Vol.82 (3), p.784-788
Main Authors: Jung, Jung-yeul, Kim, Young Won, Yoo, Jung Yul, Koo, Junemo, Kang, Yong Tae
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Dispersion
Electrostatics
Evaporation
Exact sciences and technology
General, instrumentation
Hydrophilic surfaces
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Summary:The evaporating sessile droplet of a mono/didisperse colloid on a plate is a very useful and handy technique in micro/nano/bioapplications to separate, pattern, and control the particles. Although the fundamental nature of the evaporation phenomena and its applications have been extensively proposed, the crucial forces affecting a single particle motion in an evaporating droplet are not reported yet. To elucidate the impact of various forces including the drag, electrostatic, van der Waals, and surface tension forces on the particle motion in suspension, the magnitudes of them are compared using the scale analysis. In the early stage of the evaporation, in which the contact line is fixed, the motion of a single particle suspended in liquid are mostly affected by drag force. Later, with the incidence of the contact line recession, the surface tension force takes over the control of the single particle motion.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac902288z