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Title: Is an electric field always a promoter of wetting? Electro-dewetting of metals by electrolytes probed by in situ X-ray nanotomography

We developed a special electrochemical cell enabling quantitative analysis andin situX-ray nanotomography of metal/electrolyte interfaces subject to corrosion. Using this cell and applying the nodoid model to describe menisci formed on tungsten wires during anodization, the evolution of the electrolyte surface tension, the concentration of reaction products, and the meniscus contact angle were studied. In contrast to the electrowetting effect, where the applied electric field decreases the contact angle of electrolytes, anodization of the tungsten wires increases the contact angle of the meniscus. Hence, an electric field favors dewetting rather than wetting of the newly formed surface. Finally, the discovered effect opens up new opportunities for the control of wetting phenomena and calls for the revision of existing theories of electrowetting.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ; ORCiD logo [1]
  1. Clemson Univ., SC (United States). Dept. of Materials Science and Engineering
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Photon Sciences Directorate
Publication Date:
Report Number(s):
BNL-203471-2018-JAAM
Journal ID: ISSN 1359-6640; FDISE6
Grant/Contract Number:
SC0012704; AC02-98CH10886
Type:
Accepted Manuscript
Journal Name:
Faraday Discussions
Additional Journal Information:
Journal Volume: 199; Journal ID: ISSN 1359-6640
Publisher:
Royal Society of Chemistry
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1436249