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A new method was developed in order to achieve an excellent dispersion of magnetite onto a polymer matrix. For that a ferrofluid was prepared containing nanometric size (15nm) magnetite and di-octyl phthalate (PVC plasticizer), this ferrofluid was dispersed in a polyvinyl chloride (PVC) plastisol and magnetic PVC films were made by static casting from plastisols and ferrofluids based on magnetite...