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Control over calcium carbonate phase formation by dendrimer/surfactant templates
journal contributionposted on 2023-05-18, 14:20 authored by Donners, JJJM, Heywood, BR, Meijer, EW, Nolte, RJM, Sommerdijk, NAJM
Poly(propylene imine) dendrimers that are modified with long alkyl chains self-assemble to form welldefined aggregates. The geometry and surface chemistry of the dendrimer assemblies can be varied through the addition of surfactants. These dendrimer/surfactant aggregates can be tuned to template the formation of the different phases of calcium carbonate. The use of octadecylamine results in the formation of polyhedral aggregates that become embedded within an amorphous calcium carbonate phase that persists in competition with the thermodynamic product, calcite. In combination with hexadecyltrimethylammonium bromide, small spherical aggregates are formed that induce the formation of vaterite. The use of the negatively charged surfactant SDS results in growth retardation by the Ca2+-induced agglomeration of dendrimer/surfactant aggregates into giant spherical particles. Eventually these particles become overgrown by rhombohedral calcite.
Publication titleChemistry: A European Journal
PublisherWiley-V C H Verlag Gmbh
Place of publicationPo Box 10 11 61, Weinheim, Germany, D-69451
Rights statementCopyright WILEY-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002