Affordable Access

Access to the full text

Effect of oxidation on the Mechanical Properties of Liquid Gallium and Eutectic Gallium-Indium

Authors
  • Xu, Qin
  • Qudalov, Nikolai
  • Guo, Qiti
  • Jaeger, Heinrich
  • Brown, Eric
Type
Preprint
Publication Date
Jan 23, 2012
Submission Date
Jan 23, 2012
Identifiers
DOI: 10.1063/1.4724313
Source
arXiv
License
Yellow
External links

Abstract

Liquid metals exhibit remarkable mechanical properties, in particular large surface tension and low viscosity. However, these properties are greatly affected by oxidation when exposed to air. We measure the viscosity, surface tension, and contact angle of gallium (Ga) and a eutectic gallium-indium alloy (eGaIn) while controlling such oxidation by surrounding the metal with an acid bath of variable concentration. Rheometry measurements reveal a yield stress directly attributable to an oxide skin that obscures the intrinsic behavior of the liquid metals. We demonstrate how the intrinsic viscosity can be obtained with precision through a scaling technique that collapses low- and high-Reynolds number data. Measuring surface tension with a pendant drop method, we show that the oxide skin generates a surface stress that mimics surface tension and develop a simple model to relate this to the yield stress obtained from rheometry. We find that yield stress, surface tension, and contact angle all transition from solid-like to liquid behavior at the same critical acid concentration, thereby quantitatively confirming that the wettability of these liquid metals is due to the oxide skin.

Report this publication

Statistics

Seen <100 times