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Volume: 29 | Article ID: art00012_2
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Internal Flows and Particle Transport Inside Picoliter Droplets of Binary Solvent Mixtures
E.L. Talbot
A. Berson
L. Yang
C.D. Bain
  DOI :  10.2352/ISSN.2169-4451.2013.29.1.art00012_2  Published Online :  January 2013
Abstract

The flows in evaporating droplets of binary mixtures are much more complicated than single solvent systems. Solutal Marangoni flows are generated due to differential evaporation of components. High-speed imaging techniques are used to visualize how internal flows transport particles to build up the end deposit. Circulatory flow along streamlines develops inside droplets at the contact line or central region, depending on the direction of the Marangoni flow. Re-circulation of particles can reduce the build up of a ring stain. Additionally, particles migrate across streamlines to collect at the droplet center independent of where the circulating regions occur. Potential mechanisms for particle migration are discussed, including chemophoresis, thermophoresis and shear-induced migration.

Journal Title : NIP & Digital Fabrication Conference
Publisher Name : Society of Imaging Science and Technology
Publisher Location : 7003 Kilworth Lane, Springfield, VA 22151, USA
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 DOI 10.2352/ISSN.2169-4451.2013.29.1.art00012_2
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  Cite this article 

E.L. Talbot, A. Berson, L. Yang, C.D. Bain, "Internal Flows and Particle Transport Inside Picoliter Droplets of Binary Solvent Mixtures"  in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP29),  2013,  pp 307 - 312,  https://doi.org/10.2352/ISSN.2169-4451.2013.29.1.art00012_2

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Society of Imaging Science and Technology
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2169-4451(20130101)2013:2L.307;1-
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Articles
Internal Flows and Particle Transport Inside Picoliter Droplets of Binary Solvent Mixtures
TalbotE.L.
BersonA.
YangL.
BainC.D.
01012013
2013
2
307
312
2013
The flows in evaporating droplets of binary mixtures are much more complicated than single solvent systems. Solutal Marangoni flows are generated due to differential evaporation of components. High-speed imaging techniques are used to visualize how internal flows transport particles to build up the end deposit. Circulatory flow along streamlines develops inside droplets at the contact line or central region, depending on the direction of the Marangoni flow. Re-circulation of particles can reduce the build up of a ring stain. Additionally, particles migrate across streamlines to collect at the droplet center independent of where the circulating regions occur. Potential mechanisms for particle migration are discussed, including chemophoresis, thermophoresis and shear-induced migration.