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Keywords:

  • drug delivery;
  • controlled release;
  • nanocapsules;
  • core/shell materials;
  • stimuli-responsive materials
Thumbnail image of graphical abstract

Core/single-crystal-shell nanospheres are constructed from a poly-(N-vinyl- 2-pyrrolidone) (PVP)-modified silica core with an outer layer of single-crystal iron oxide shell. The nanospheres show outstanding release-and-zero-release characteristics via the addition and removal, respectively, of an external high-frequency magnetic field.