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Synthesis of hematite/silica/polymer composite colloids with a tunable morphology

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Hematite/SiO2/polystyrene colloidal particles were synthesized through emulsion polymerization, in the presence of seeds coated with 3-methacryloxypropyltrimethoxysilane (MPS). Scanning and transmission electron microscopy studies indicate that flying saucer-like particles can be prepared by taking advantage of the coalescence phenomenon which occurs between growing polymer nodules when the MPS surface density of the coupling agent is high. By decreasing this density, multipod-like and raspberry-like composite particles were obtained, depending on the concentration of monomer.

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  1. Assuming that (a) all MMS molecules are grafted, (b) hematite/silica particles are ellipsoidal and their silica shell are dense, and (c) silica density is 2.2 g cm−3.


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Correspondence to Serge Ravaine.

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Forestier, T., Ferrié, M. & Ravaine, S. Synthesis of hematite/silica/polymer composite colloids with a tunable morphology. Colloid Polym Sci 291, 187–192 (2013).

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