You are not logged in.

Electrowetting measurements with mercury showing mercury/mica interfacial energy depends on charging

Antelmi, David A., Connor, Jason N. and Horn, Roger G. 2004, Electrowetting measurements with mercury showing mercury/mica interfacial energy depends on charging, Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical, vol. 108, no. 3, pp. 1030-1037, doi: 10.1021/jp036371u.

Attached Files
Name Description MIMEType Size Downloads

Title Electrowetting measurements with mercury showing mercury/mica interfacial energy depends on charging
Author(s) Antelmi, David A.
Connor, Jason N.
Horn, Roger G.
Journal name Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical
Volume number 108
Issue number 3
Start page 1030
End page 1037
Total pages 8
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2004-01-22
ISSN 1520-6106
1520-5207
Keyword(s) Contact angle
Electrochemical electrodes
Electrolytes
Mercury (metal)
Mica
Numerical methods
Potassium compounds
Surface tension
Surfaces
Wetting
Summary We demonstrate that the interfacial energy between mercury and mica is a function of charge on the mercury surface, decreasing with increasing positive charge. The contact angle of mercury on mica has been measured as a function of potential applied to the mercury, which forms the working electrode of a cell containing either KC1 or NaF electrolyte solution. At high negative applied potentials, a stable aqueous film exists between the mercury and mica surface. As potential is made less negative, the film collapses and mercury partial1 wets the mica at a critical potential, close to the electrocapillary maximum. Upon increasing the potential further (making the Hg surface more and more positive), the contact angle measured within the mercury continually decreases. Electrowetting with mercury is not unexpected since its interfacial tension with the aqueous phase is known to be a function of applied potential. However, the observed decrease goes against the trend expected from the Young equation if only this effect is considered. To explain the data we must allow the mercury/mica interfacial tension also to vary with applied potential. This variation indicates that the mercury surface is positively charged by contact with mica, consistent with known contact electrification between these two materials. The inherent charges at the mercury interfaces with mica and electrolyte solution result in contact angle changes of some tens of degrees with a change in applied potential of half a volt orders of magnitude less than the potentials required to effect comparable changes in other electrowetting systems.
Language eng
DOI 10.1021/jp036371u
Field of Research 029999 Physical Sciences not elsewhere classified
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2004, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30041421

Connect to link resolver
 
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 11 times in TR Web of Science
Scopus Citation Count Cited 10 times in Scopus
Google Scholar Search Google Scholar
Access Statistics: 139 Abstract Views, 0 File Downloads  -  Detailed Statistics
Created: Fri, 13 Jan 2012, 10:11:00 EST

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.