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Optovibrometry: tracking changes in the surface tension and viscosity of multicomponent droplets in real-time

Harrold, Victoria C.; Sharp, James S.

Authors

Victoria C. Harrold

JAMES SHARP james.sharp@nottingham.ac.uk
Associate Professor



Abstract

An instrument was developed for measuring real time changes in the surface tension and viscosity of multicomponent droplets of miscible liquids and other soft materials. Droplets containing glycerol and water were supported on superamphiphobic surfaces and vibrated by applying a short mechanical impulse. Laser light was refracted through the droplets and allowed to fall on the surface of a photodiode. Time dependent variations in the intensity measured by the photodiode during vibration were used to monitor the decay of the droplet oscillations. The frequencies and spectral widths of the droplet vibrational resonances were then obtained from Fourier transforms of these time dependent intensity signals. A recently developed model of viscoelastic droplet vibration was used along with these values and measurements of the drop dimensions to extract the surface tension and viscosity of the drops as they evaporated. Collection of data was automated and values of frequency, spectral width, drop size, surface tension and viscosity were obtained with a time resolution of three seconds over a period of thirty minutes. The values of surface tension and viscosity obtained were shown to be in good agreement with literature values obtained from bulk glycerol/water solutions; thus validating the technique for wider application to other multicomponent liquids and soft matter systems.

Citation

Harrold, V. C., & Sharp, J. S. (2016). Optovibrometry: tracking changes in the surface tension and viscosity of multicomponent droplets in real-time. Soft Matter, 12(42), https://doi.org/10.1039/C6SM01901C

Journal Article Type Article
Acceptance Date Sep 23, 2016
Online Publication Date Sep 23, 2016
Publication Date Nov 14, 2016
Deposit Date Jan 3, 2017
Publicly Available Date Mar 29, 2024
Journal Soft Matter
Print ISSN 1744-683X
Electronic ISSN 1744-6848
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 12
Issue 42
DOI https://doi.org/10.1039/C6SM01901C
Public URL https://nottingham-repository.worktribe.com/output/828700
Publisher URL http://pubs.rsc.org/en/Content/ArticleLanding/2016/SM/C6SM01901C#!divAbstract

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