Controlled addition of new liquid component into surface droplet arrays by solvent exchange

Li, M, Yu, H, Bao, L, Dyett, B and Zhang, X 2019, 'Controlled addition of new liquid component into surface droplet arrays by solvent exchange', Journal of colloid and interface science, vol. 543, pp. 164-173.

Document type: Journal Article
Collection: Journal Articles

Title Controlled addition of new liquid component into surface droplet arrays by solvent exchange
Author(s) Li, M
Yu, H
Bao, L
Dyett, B
Zhang, X
Year 2019
Journal name Journal of colloid and interface science
Volume number 543
Start page 164
End page 173
Total pages 10
Publisher Elsevier
Abstract HYPOTHESIS: Microscopic droplets integrating multiple functionalities are essential in the microcompartmentalized related reaction and applications. Solvent exchange is a simple approach for producing femtoliter surface droplets by the transit oversaturation created at the mixing front of a solution by a poor solvent. But it remains challenging to control the compositions in nanodroplets. Our hypothesis is the new liquid component can be added to the pre-formed surface droplets at certain ratios controlled by solvent exchange. EXPERIMENTS: In this work we investigate the growth of the droplets during addition of a new component by solvent exchange. Two-component droplets were formed on a microdomain patterned substrate as highly ordered arrays. The physical and chemical parameters that control droplet composition and a possible application of the binary droplet arrays were presented in this work. FINDINGS: The added amount of the second component in the binary droplet can be quantitatively controlled by the solution and flow conditions. The theoretical prediction of the component ratio based on the droplet diffusive growth dynamics mode shows a good agreement with the experimental results. The results show that the solvent exchange on the surface with pre-formed droplets provides a highly efficient method to tune the droplet compositions to desired ratio. The unique feature of this approach enables a gradient structure of droplet composition over the surface, demonstrated by an application of different microlens performance on a surface.
Subject Colloid and Surface Chemistry
Keyword(s) Droplet arrays
Solvent exchange
Surface gradient
DOI - identifier 10.1016/j.jcis.2019.02.046
Copyright notice © 2019 Elsevier Inc. All rights reserved.
ISSN 1095-7103
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