Abstract
The importance of hydrothermal technology in the preparation of nanomaterials has been discussed in detail with reference to the processing of advanced materials for nanotechnology. Hydrothermal technol-ogy in the 21st century is not just confined to the crystal growth or leaching of metals, but it is going to take a very broad shape covering several interdisciplinary branches of science. The role of supercritical
water and supercritical fluids has been discussed with appropriate examples. The physical chemistry of hydrothermal processing of advanced materials and the instrumentation used in their preparation with re-spect to nanomaterials have been discussed. The synthesis of monodispersed nanoparticles of various metal oxides, metal sulphides, carbon nanoforms (including the carbon nanotubes), biomaterials, and some selected composites has been discussed. Recycling, waste treatment and alteration under hydrother-mal supercritical conditions have been highlighted. The authors have discussed the perspectives of hydro-thermal technology for the processing of advanced nanomaterials and composites.
 2007 Elsevier Ltd. All rights reserved

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