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Control over calcium carbonate phase formation by dendrimer/surfactant templates
journal contribution
posted on 2023-05-18, 14:20 authored by Donners, JJJM, Heywood, BR, Meijer, EW, Nolte, RJM, Sommerdijk, NAJMPoly(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.
History
Publication title
Chemistry: A European JournalVolume
8Issue
11Pagination
2561-2567ISSN
0947-6539Publisher
Wiley-V C H Verlag GmbhPlace of publication
Po Box 10 11 61, Weinheim, Germany, D-69451Rights statement
Copyright WILEY-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002Repository Status
- Restricted