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According to ISO Technical Standard, a nanoparticle is defined a nano-object with all three external dimensions in the nanoscale, whose longest and the shortest axes do not differ significantly, having size between 1 and 100 nanometres (nm). Nanopowders are agglomerates of particles, nanoparticles, or nanoclusters. In contrast to nanopowders which tend to agglomerate to larger grains and where electron microscopy shows large particle sizes with a relatively broad size distribution, nanoparticles generally exhibit small sizes, well defined and regular shapes and have histograms with a narrow size distribution curve.
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