Synthesis and properties of magnetite-poly(aminopropylsiloxane) composites

A method is developed for the synthesis of nanosized Fe3O4-(SiO2) x [NH2(CH2)3SiO3/2] y magnetic composites with varied SiO2: NH2(CH2)3SiO3/2, weight/weight, ratios. The structure, texture, morphology, and magnetic properties of the obtained materials are studied by several physicochemical methods. It is shown that the composites represent systems of magnetite nanoparticles coated with poly(aminopropylsiloxane). The specific surface areas, pore volumes, and saturation magnetizations of the composites are in the ranges of 21–27 m2/g, 0.03–0.04 cm3/g, and 59–62 G cm3/g, respectively.