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Keywords:

  • Nanoparticles, assembly;
  • Nanoparticles, polymer;
  • Poly(ethylene glycol);
  • Template-free assembly/synthesis
Thumbnail image of graphical abstract

Freeze-drying of polymeric nanoparticles with projection coronas results in the successful formation of three-dimensional microconstructs with various morphologies, including hollow microspheres (see Figure), without a solid or colloidal template. The microconstructs have sufficient mechanical strength to redisperse successfully in water without collapsing, while they break into nanoparticles following successive freeze–thawing cycles.