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The morphology of calcium carbonate can be tuned by using aqueous double-hydrophilic block copolymer (DHBC)–surfactant mixtures in a chemical synthesis. Calcite hollow spheres (see Figure) and vaterite discs were obtained at different concentrations of sodium dodecylsulfate (SDS) in a DHBC–SDS system. In contrast, pine-cone shaped particles were obtained by using a DHBC–cetyltrimethylammonium bromide (CTAB) system.
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Qi et al. (2002) studied this question.
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