157.
Hollow silica nanoparticles were prepared from Dy
2O
3@SiO
2 core–shell nanocomposites, for the first time, by a simple ultrasonic assisted sol–gel method. The Dy
2O
3@SiO
2 core–shell nanocomposites were prepared by the deposition of a SiO
2 layer onto the surface of Dy
2O
3 nanoparticles using a three-step coating process. The hollow SiO
2 nanostructures were obtained by selective removal of the Dy
2O
3 cores. The structure, morphology and composition of the products were determined by the techniques of X-ray diffraction, Fourier transfom infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. The results indicated that hollow SiO
2 nanostructures were sphere-like shape with the average size of 20?nm and had an amorphous crystal structure. The important advantage of this process is the recyclability of the Dy
2O
3 nanoparticles as the starting material of the reaction.
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