METHOD FOR THE IN SITU CHARACTERIZATION OF PRIMARY PARTICLES AND PARTICLE AGGREGATES

摘要

The invention concerns a method for the in situ determination of the size of primary particles. In the prior art, the determination of the size of small particles, in particular those in the nanometre range, is possible only by measuring the size of an aggregate, i.e. a conglomeration of several primary particles, and thus gives the correct size only for particles which occur in isolation. The method proposed makes it possible to determine the particle size in both cases, and well as other parameters which can be derived from the size. The particles are irradiated with a high-energy pulse of radiation. The thermal radiation emitted is detected at two points in time, thus enabling the particle size to be determined unequivocally from the measured signal ratio using a calculated model. The method is suitable for the measurement of the size of small particles in various production and conversion processes, e.g. for carbon black and metal oxides.