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

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

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.

• Presentation Conference Type: Conference Paper (Published)
• Conference Name: NIP & Digital Fabrication Conference, 2013: 29th International Conference on Digital Printing Technologies
• 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
• Public URL: https://durham-repository.worktribe.com/output/1156074
• Publisher URL: http://ist.publisher.ingentaconnect.com/content/ist/nipdf/2013/00002013/00000002/art00012
• Additional Information: Conference dates: September 29 – October 3, 2013