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Surfaces and interfaces

Surfaces and interfaces

Liquid–metal interfaces show large thermoelectric effect

10 Jul 2024 Isabelle Dumé
Schematic image of the experiment showing a transparent layer of gallium stacked atop a silvery layer of mercury around a spool-like device, with poloidal currents (represented by blue lines) looping around the material and magnetic field lines (yellow) running along the interface.
Liquid-liquid effect: Physicists have observed a thermoelectric effect between two metals, gallium and mercury, that are both liquids at 30 °C. This schematic 3D image of gallium (transparent) and mercury layers shows the thermoelectric poloidal currents (blue) and magnetic field (yellow) that develop at the interface. (Courtesy: Christophe Gissinger)
The thermoelectric effect is much stronger at the interface of two liquid metals than it is in solid

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Isabelle Dumé is a contributing editor to Physics World
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