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

Nave, Maryana I.; Gu, Yu; Karen Chen-Wiegart, Yu-Chen; Wang, Jun; Kornev, Konstantin G.

doi:10.1039/C6FD00239K

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

Journal Article · Thu Jan 05 00:00:00 UTC 2017 · Faraday Discussions

DOI: https://doi.org/10.1039/C6FD00239K · OSTI ID:1436249

Nave, Maryana I. ^[1]; Gu, Yu ^[1]; Karen Chen-Wiegart, Yu-Chen ^[2]; Wang, Jun ^[2];

^[1]

Clemson Univ., SC (United States). Dept. of Materials Science and Engineering
Brookhaven National Lab. (BNL), Upton, NY (United States). Photon Sciences Directorate

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-98CH10886; SC0012704

OSTI ID:: 1436249

Report Number(s):: BNL--203471-2018-JAAM

Journal Information:: Faraday Discussions, Journal Name: Faraday Discussions Vol. 199; ISSN 1359-6640; ISSN FDISE6

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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