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Keywords:

  • Nanocrystals, cobalt;
  • Supracrystals

Magnetic “supra” crystals have been built by slow evaporation of a solution of 7.2 nm cobalt nanoparticles in hexane. Scanning electron microscopy shows isolated pavements which height is of the order of 5 μm (see Figure). Investigation made by small-angle X-ray diffraction clearly indicates a face-centered cubic structure.