Abstract
The structure of chain aggregates in polydisperse ferrocolloids is considered. The chain distribution over the number of constituent particles is investigated on the basis of the method of heterophase fluctuations. The polydispersity of ferrofluids is taken into account within the frameworks of two-fraction model suggesting the presence of a large number of small particles and a small number of large particles. The sorting algorithm of chain structures with various energies is presented. It is shown that, in real ferrofluids, the most probable are the chains composed of large particles with one or two small particles at the edges. The model predicts that the most of large particles are bonded into short chain aggregates whose average length consists of two or three particles at room temperature.
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