

FIZIKA B 7 (1998) 2, 6572 FRACTAL ANALYSIS OF SUSPENDED PARTICLES IN SEAWATERMLADEN MARTINIS^{a} and DUBRAVKO RISOVIĆ ^{a}email: martinis@thphys.irb.hr Received 27 October 1997;revised manuscript received 30 March 1998; Accepted 13 July 1998Lightscattering data of suspended clusters of particles in seawater have been analysed to find some evidence for fractal structure of the scatterers. The behaviour of the scattering intensity I(q) as a function of q suggests that the scattering medium consists of two kinds of particles, large ones, with fractal dimension 1.7 ±0.1, resulting from a regular DLCA growing process, and smaller ones, with a considerably larger fractal dimension 2.7 ±0.4, resulting from a more complex clustercluster aggregation process in which low sticking probabilities, restructuring and settling could be present. This conclusion is strongly supported by the I(q) curve which, in a loglog plot, exhibits two well defined linear regions. In interpreting data, it is assumed that the polydispersity of the scatterers is described by a smooth twocomponent particlesize distribution. The fractal structure of the scatterers is described by the behaviour of the scattering intensity from clusters of different size. PACS numbers: 47.53.+n, 64.60.Cn, 68.70.+w, 92.10.Bf

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