Nanoparticle Melting — 3D Lattice Simulator

This is the same real Gibbs–Thomson melting-point-depression physics rendered as an actual 3D atomic lattice: every instanced sphere is one atom of a gold, tin or lead nanocrystal sized directly from the radius slider. As temperature climbs toward the size-depressed melting point T_m(r), a quasi-liquid skin nucleates at the undercoordinated outer shell and sweeps inward — visualized as a translucent shell boundary — until the whole lattice collapses to a liquid drop exactly at T_m(r). Orbit the crystal to watch the shell thicken from any angle.