autoensamblarse

A technical term from chemistry, materials science, and robotics for components or molecules that organize into a structure without external direction — rare outside scientific writing.

• Las moléculas pueden autoensamblarse en estructuras complejas. — Molecules can self-assemble into complex structures.
• Investigadores diseñaron nanopartículas capaces de autoensamblarse. — Researchers designed nanoparticles capable of self-assembling.
• El material se autoensambla al alcanzar cierta temperatura. — The material self-assembles once it reaches a certain temperature.

Not used for furniture or everyday objects a person assembles — that's just armar or montar; autoensamblarse specifically means the components organize themselves without a person's intervention.

Often confused with ensamblar.