Internal Flows and Particle Transport Inside Picoliter Droplets of Binary Solvent Mixtures

Talbot, E.L.; Berson, A.; Yang, L.; Bain, C.D.

Internal Flows and Particle Transport Inside Picoliter Droplets of Binary Solvent Mixtures

Talbot, E.L.; Berson, A.; Yang, L.; Bain, C.D.

Authors

E.L. Talbot

A. Berson

L. Yang

Professor Colin Bain c.d.bain@durham.ac.uk
Pro-Vice-Chancellor (Research)

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.

Citation

Talbot, E., Berson, A., Yang, L., & Bain, C. (2013). Internal Flows and Particle Transport Inside Picoliter Droplets of Binary Solvent Mixtures.

Conference Name	NIP & Digital Fabrication Conference, 2013: 29th International Conference on Digital Printing Technologies
Conference Location	Seattle, Washington
Publication Date	Jan 1, 2013
Deposit Date	Jun 11, 2014
Publicly Available Date	Jul 14, 2014
Volume	2013
Pages	307-312
Series Title	Conference Proceedings: NIP and Digital Fabrication
Series ISSN	2169-4451
Publisher URL	http://ist.publisher.ingentaconnect.com/content/ist/nipdf/2013/00002013/00000002/art00012
Additional Information	Conference dates: September 29 – October 3, 2013

Files

Published Conference Proceeding (418 Kb)
PDF

Copyright Statement
Reprinted with permission of IS&T: The Society for Imaging Science and Technology sole copyright owners IS&T NIP29: International Conference on Digital Printing Technologies and Digital Fabrication 2013 Final Program and Proceedings.