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Keywords:

  • indium;
  • hollow spheres;
  • nanoparticles;
  • thermal expansion;
  • transmission electron microscopy
Thumbnail image of graphical abstract

Nano popcorn: a new formation mechanism for the synthesis of hollow metal oxide nanoparticles through a melt fracture mechanism. The hollow nanoparticles are formed via brittle fracture following the generation of tensile stresses arising due to liquid-phase thermal expansion of a low melting point core metal. The progress of this physical process can be monitored using in situ transmission electron microscopy for a model system of indium/indium oxide.