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A Systematic Examination of the Morphogenesis of Calcium Carbonate in the Presence of a Double-Hydrophilic Block Copolymer

A Systematic Examination of the Morphogenesis of Calcium Carbonate in the Presence of a Double-Hydrophilic Block Copolymer

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CÖLFEN, Helmut, Limin QI, 2001. A Systematic Examination of the Morphogenesis of Calcium Carbonate in the Presence of a Double-Hydrophilic Block Copolymer. In: Chemistry - A European Journal. 7(1), pp. 106-116. ISSN 0947-6539. eISSN 1521-3765. Available under: doi: 10.1002/1521-3765(20010105)7:1<106::AID-CHEM106>3.0.CO;2-D

@article{Colfen2001-01-05Syste-40573, title={A Systematic Examination of the Morphogenesis of Calcium Carbonate in the Presence of a Double-Hydrophilic Block Copolymer}, year={2001}, doi={10.1002/1521-3765(20010105)7:1<106::AID-CHEM106>3.0.CO;2-D}, number={1}, volume={7}, issn={0947-6539}, journal={Chemistry - A European Journal}, pages={106--116}, author={Cölfen, Helmut and Qi, Limin} }

In this paper, a systematic study of the influence of various experimental parameters on the morphology and size of CaCO<sub>3</sub> crystals after room-temperature crystallization from water in the presence of poly(ethylene glycol)-block-poly(methacrylic acid) (PEG-b-PMAA) is presented. The pH of the solution, the block copolymer concentration, and the ratio [polymer]/[CaCO<sub>3</sub>] turned out to be important parameters for the morphogenesis of CaCO<sub>3</sub>, whereas a moderate increase of the ionic strength (0.016 M) had no influence. Depending on the experimental conditions, the crystal morphologies can be tuned from calcite rhombohedra via rods, ellipsoids or dumbbells to spheres. A morphology map is presented which allows the prediction of the crystal morphology from a combination of pH, and CaCO<sub>3</sub> and polymer concentration. Morphologies reported in literature for the same system but under different crystallization conditions agree well with the predictions from the morphology map. A closer examination of the growth of polycrystalline macroscopic CaCO<sub>3</sub> spheres by TEM and time-resolved dynamic light scattering showed that CaCO<sub>3</sub> macrocrystals are formed from strings of aggregated amorphous nanoparticles and then recrystallize as dumbbell-shaped or spherical calcite macrocrystal. 2017-11-10T08:55:06Z Cölfen, Helmut A Systematic Examination of the Morphogenesis of Calcium Carbonate in the Presence of a Double-Hydrophilic Block Copolymer 2001-01-05 Cölfen, Helmut 2017-11-10T08:55:06Z Qi, Limin eng Qi, Limin

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