Directional motion of Gallium-based liquid metal induced by asymmetric chemical surrounding

Journal article


Wang, B., Wang, Q., Zhang Y.W, Zhang Y.C., Li Y. and Zhao, D. (2023). Directional motion of Gallium-based liquid metal induced by asymmetric chemical surrounding. Journal of Chemical Education. 100 (8), pp. 3156-3161. https://doi.org/10.1021/acs.jchemed.3c00311
AuthorsWang, B., Wang, Q., Zhang Y.W, Zhang Y.C., Li Y. and Zhao, D.
Abstract

Interfacial, or surface tension, is a significant topic in chemical education. This paper describes the directional motion of gallium-based liquid metal drops, resulting from a difference of interfacial tension across the drop. This demonstration can engage students in discovering the underlying chemical principles. A mechanism for the drop’s directional motion is proposed to provide insight into this intriguing phenomenon. It appears that unbalanced chemical environments cause different physical or chemical processes to occur on each hemisphere of the drop, such as a pH difference, redox reactions, galvanic replacement, or adsorption. As a result, a difference in the interfacial tension across the drop is generated, providing the driving force that acts on the drop. This demonstration can be used to introduce the fundamental principles in chemical reactions, such as redox activity, electrical double-layer formation, and interfacial tension.

KeywordsFirst-Year Undergraduate/General, Upper-Divison Undergraduate, Interfacial/Surface Tension, Electrochemistry, Electrical Double Layer, Surface Science
Year2023
JournalJournal of Chemical Education
Journal citation100 (8), pp. 3156-3161
PublisherAmerican Chemical Society (ACS)
ISSN 1938-1328
Digital Object Identifier (DOI)https://doi.org/10.1021/acs.jchemed.3c00311
Web address (URL)https://doi.org/10.1021/acs.jchemed.3c00311
Publication dates
Print23 Jul 2023
Publication process dates
Accepted13 Jul 2023
Deposited25 Jul 2023
Accepted author manuscript
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Open
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