Scientists squeeze nanocrystals in a liquid droplet into a solid-like state and back again

Nanocrystals within a liquid droplet, injected into an oily solution (l.), are chemically compressed into a solid-like "jammed" 2D state (m.) - which causes wrinkles to form on the surface of the droplet - and then revert to a relaxed, liquid-like state (r.) in which the wrinkles smooth out. (LBNL)