Method and system for analyzing the stoichiometry of the particles; the production of particles with the control of the stoichiometry

摘要

Method of analysis of the composite particles of diameter less than 1 μm, in order to determine their stoichiometry. According to this method, at least once, it executes the steps b1) and b2): b1), a laser firing (10) on a flow of an aerosol containing the particles to be analyzed, so as to form a plasma (12), and b2), it acquires an emission spectrum (18) from the plasma (12) with an optical spectrometer (68) equipped with a detector (66,70); and then, c) on the basis of the spectrum (s) of transmission (18) is obtained (s), it determines the stoichiometry of the particles. Analysis system for implementing this method. Advantageously, the stoichiometry is determined almost in real time, making it possible to use for the processes. Method of manufacture of particles by laser pyrolysis, in which the stoichiometry is controlled according to the analysis method cited above ci -.