Methods for The Testing of Nanopowder

Nowadays nanopowders of metals, alloys, intermetallides, and their chemical compounds are produced by different ways. One of the problems suppressing promotion of nanopowders to the industry is the absence of reliable and objective methods for their testing. Undoubtedly, an important moment in testing is a correct interpretation of obtained experimental data. The objective of this work is an overview of existing testing methods, analysis of these methods adequacy, and estimation of a possibility to create a system for nanopowders testing. In the work, nanopowders produced by wire electric explosion (WEE) were used for experiments [1]. Nanopowders produced by evaporation-condensation in gas media and industrial powders with a diameter of 1-2 μm were also used for comparison. The most important parameters, which give a possibility to refer an analyzed powder to nanopowders, are characteristic sizes of particles (ā0) and specific surface area (Ssp). In case of irregular particles shape, it is necessary to take into account 3 characteristic values: length, width, and thickness. The integral characteristic is Ssp and conditional surface-average diameter of particles (ās):