Nanotechnologies, nanoparticles and nanomaterials, which are part of everyday life today, are the subject of intense research activities and a certain amount of media coverage. In this article, the concepts of nanotechnologies, nanoparticles and nanosciences are defined and the interest in this scale of the matter is explained by specifying in particular the particular properties of nanoobjects. Large-scale applications of nanoparticles, particularly in the field of chemicals, everyday life and catalysis are presented.
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