Irregular aerosol agglomerates of small primary particles are formed in different natural and industrial processes. These agglomerates have mass fractal-like structure, i.e., the mass M of the agglomerate is related with the agglomerate radius R and sub-unit size a. Some experimental contributions report on too small values of the mass fractal dimension Df for soot [1-3], silica [4], titania [5]. Long range attractive interactions between colliding particles or agglomerates have been assumed to explain these small values of De [4, 6, 7]. Here we report the direct observation of dipolar interaction between coagulating agglomerates of hydrogenated silicon. We found the occurring of a mechanism of dipole agglomerate formation by primary particles that differ for their chemical nature. We give the explanation of this phenomenon basing on the electronic strucntre of the particle material.
Dipole interaction during agglomeration of aerosol particles
di Stasio S;
2000
Abstract
Irregular aerosol agglomerates of small primary particles are formed in different natural and industrial processes. These agglomerates have mass fractal-like structure, i.e., the mass M of the agglomerate is related with the agglomerate radius R and sub-unit size a. Some experimental contributions report on too small values of the mass fractal dimension Df for soot [1-3], silica [4], titania [5]. Long range attractive interactions between colliding particles or agglomerates have been assumed to explain these small values of De [4, 6, 7]. Here we report the direct observation of dipolar interaction between coagulating agglomerates of hydrogenated silicon. We found the occurring of a mechanism of dipole agglomerate formation by primary particles that differ for their chemical nature. We give the explanation of this phenomenon basing on the electronic strucntre of the particle material.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
