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Optical microscopy images for (a) the pure A, (b) in situ 15CS–A, (c) in situ 30CS–A, (d) non-in situ 15CS–A and (e) non-in situ 30CS–A microspheres. (b,c) In situ CS–A microspheres appear white because of a silicate layer, as a shell, on the surface of A (core). (e) Only a few white particles on the surface of non-in situ CS–A microspheres. (Online version in colour.)
