Watching liquid metal freeze — in open air, with simple tools

What is it about?

What happens when a droplet of liquid metal freezes? More than you'd expect! In our new study, we cooled tiny Galinstan droplets on a Peltier stage and watched what happened with thermal and optical cameras. We saw the liquid supercool well below its expected freezing point, dendrites growing on the droplet surface, sudden volume changes, and wetting behavior that shifts throughout cooling — all signs that freezing is far more complex than a simple liquid-to-solid switch. The best part? We did all of this in open air, with affordable and widely available equipment. Previous studies needed ultra-high-vacuum chambers and specialized setups — our approach shows that complex phase tracking can be done simply, on any lab bench. This opens the door for practical applications of liquid metals in electronics, microfluidics, and thermally tunable systems.

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