Growth dynamics of surface nanodroplets during solvent exchange at varying flow rates

Dyett, B, Kiyama, A, Rump, M, Tagawa, Y, Lohse, D and Zhang, X 2018, 'Growth dynamics of surface nanodroplets during solvent exchange at varying flow rates', Soft Matter, vol. 14, no. 25, pp. 5197-5204.

Document type: Journal Article
Collection: Journal Articles

Title Growth dynamics of surface nanodroplets during solvent exchange at varying flow rates
Author(s) Dyett, B
Kiyama, A
Rump, M
Tagawa, Y
Lohse, D
Zhang, X
Year 2018
Journal name Soft Matter
Volume number 14
Issue number 25
Start page 5197
End page 5204
Total pages 8
Publisher Royal Society of Chemistry
Abstract Solvent exchange is a simple solution-based process to produce surface nanodroplets over a large area. The final size of the droplets is determined by both the flow and solution conditions for a given substrate. In this work, we investigate the growth dynamics of surface nanodroplets during solvent exchange by using total internal reflection fluorescence microscopy (TIRF). The results show that during the solvent exchange, the formation of surface nanodroplets advanced on the surface in the direction of the flow. The time for the number density and surface coverage of the droplets to reach their respective plateau values is determined by the flow rate. From the observed evolution of the droplet volume and of the size of individual growing droplets, we are able to determine that the growth time of the droplets scales with the Peclet number Pe with a power law ∝Pe-1/2. This is consistent with Taylor-Aris dispersion, shedding light on the diffusive growth dynamics during the solvent exchange. Further, the spatial rearrangement of the droplets during coalescence demonstrates a preference in position shift based on size inequality, namely, the coalesced droplet resides closer to the larger of the two parent droplets. These findings provide a valuable insight toward controlling droplet size and spatial distribution.
Subject Fluid Physics
Soft Condensed Matter
Colloid and Surface Chemistry
Keyword(s) droplet
DOI - identifier 10.1039/c8sm00705e
Copyright notice This journal © The Royal Society of Chemistry 2018. Creative Commons Attribution 3.0 Unreported Licence.
ISSN 1744-683X
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