Fig. 2. Fusing crystallites into macroscale materials.

a Thermal profile for reannealing preformed crystals. Active acoustic waves pulsing is represented by a dashed blue line; inactive acoustic field (no pulsing waves) is represented by a solid red line. b–e Brightfield microscopy images of crystals subjected to the thermal reanneal protocol and acoustic waves at the different stages of the protocol, corresponding to the numerical notation in (a). f, g SEM images showing that the crystal reanneal protocol induces fusing of the crystals to form elongated macroscale morphology of crystals. h Crystals filled with AuNP aligned using acoustic waves. The red hue is the result of AuNP loaded into the lattice.