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Drying of ethanol/water droplets containing silica nanoparticles

Shi, Jing; Yang, Lisong; Bain, Colin D.

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Authors

Jing Shi



Abstract

The evaporation of colloidal drop on a substrate with a pinned contact line usually results in a ring stain (the so-called coffee-ring effect). In this paper, we present an investigation of the evaporation of sessile picoliter droplets of binary solvent mixtures containing fumed silica nanoparticles (NPs). The internal flows in ethanol/water droplets are suppressed and uniform deposit morphology achieved with a low loading (0.2–0.5 vol.%) of hydrophobic fumed silica NPs. The effective control of the particle deposit morphology is based on a rapid sol–gel transition assisted by preferential evaporation of ethanol. For droplets of dilute suspensions, the fumed silica NPs tend to agglomerate and form an elastic network quickly, starting from the region close to the three-phase contact line and below the gas–liquid interface and growing towards the interior of the droplet, as the solvents evaporate and the surface descends. Higher silica particle concentrations, lower ethanol concentrations, and weaker Marangoni flows all contribute to the solgel transition and hence to the suppression of the CRE.

Citation

Shi, J., Yang, L., & Bain, C. D. (2019). Drying of ethanol/water droplets containing silica nanoparticles. ACS Applied Materials and Interfaces, 11(15), 14275-14285. https://doi.org/10.1021/acsami.8b21731

Journal Article Type Article
Acceptance Date Mar 22, 2019
Online Publication Date Mar 22, 2019
Publication Date Apr 17, 2019
Deposit Date Mar 26, 2019
Publicly Available Date Mar 22, 2020
Journal ACS Applied Materials and Interfaces
Print ISSN 1944-8244
Electronic ISSN 1944-8252
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 11
Issue 15
Pages 14275-14285
DOI https://doi.org/10.1021/acsami.8b21731

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.8b21731





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