Atomic Corrals Unveil a Hidden Liquid State in Metals
Scientists used transmission electron microscopy to watch molten platinum nanoparticles on graphene and found that some atoms remain pinned at defect sites, forming an atomic corral that traps liquid metal and alters solidification. When only a few atoms are fixed, crystallization proceeds normally; with many pinned atoms, the liquid can remain unfrozen well below its normal freezing point and turn into an amorphous metal instead of a crystal. This corralled, hybrid state could impact catalyst design and materials science, and researchers aim to learn to place pinned atoms more precisely to build larger corrals.