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Mechanical characterization of ultralow interfacial tension oil-in-water droplets by thermal capillary wave analysis in a microfluidic device
journal contribution
posted on 2016-11-11, 14:39 authored by Guido Bolognesi, Yuki Saito, Arwen I.I. Tyler, Andrew D. Ward, Colin D. Bain, Oscar CesMeasurements of the ultralow interfacial tension and surfactant film bending rigidity for micron-sized heptane droplets in bis(2-ethylhexyl) sodium sulfosuccinate-NaCl aqueous solutions were performed in a microfluidic device through the analysis of thermally driven droplet interface fluctuations. The Fourier spectrum of the stochastic droplet interface displacement was measured through bright-field video microscopy and a contour analysis technique. The droplet interfacial tension, together with the surfactant film bending rigidity, was obtained by fitting the experimental results to the prediction of a capillary wave model. Compared to existing methods for ultralow interfacial tension measurements, this contactless, nondestructive, all-optical approach has several advantages, such as fast measurement, easy implementation, cost-effectiveness, reduced amount of liquids, and integration into lab-on-a-chip devices.
Funding
This work was supported by EPSRC grants EP/I0133 42/1 and EP/G00465X/1.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Published in
LangmuirVolume
32Issue
15Pages
3580 - 3586Citation
BOLOGNESI, G. ...et al., 2016. Mechanical characterization of ultralow interfacial tension oil-in-water droplets by thermal capillary wave analysis in a microfluidic device. Langmuir, 32(15), pp. 3580-3586.Publisher
American Chemical SocietyVersion
- VoR (Version of Record)
Rights holder
American Chemical SocietyPublisher statement
For non-commercial research and education purposes only, You may access, download, copy, display and redistribute articles as well as adapt, translate, text and data mine content contained in articles, subject to the following conditions https://pubs.acs.org/page/policy/authorchoice_termsofuse.htmlAcceptance date
2016-03-16Publication date
2016-03-16Copyright date
© 2016Notes
This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.ISSN
0743-7463eISSN
1520-5827Publisher version
Language
- en