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Synthesis of fiber-like monetite without organic additives and its transformation to hydroxyapatite

Synthesis of fiber-like monetite without organic additives and its transformation to hydroxyapatite

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CHEN, Song, Marina KRUMOVA, Helmut CÖLFEN, Elena V. STURM, 2019. Synthesis of fiber-like monetite without organic additives and its transformation to hydroxyapatite. In: Chemistry of Materials. 31(5), pp. 1543-1551. ISSN 0897-4756. eISSN 1520-5002. Available under: doi: 10.1021/acs.chemmater.8b04500

@article{Chen2019-03-12Synth-44852, title={Synthesis of fiber-like monetite without organic additives and its transformation to hydroxyapatite}, year={2019}, doi={10.1021/acs.chemmater.8b04500}, number={5}, volume={31}, issn={0897-4756}, journal={Chemistry of Materials}, pages={1543--1551}, author={Chen, Song and Krumova, Marina and Cölfen, Helmut and Sturm, Elena V.} }

2019-02-05T11:57:26Z Synthesis of fiber-like monetite without organic additives and its transformation to hydroxyapatite Cölfen, Helmut Chen, Song Chen, Song Sturm, Elena V. Cölfen, Helmut 2019-02-05T11:57:26Z eng Sturm, Elena V. Krumova, Marina Monetite (CaHPO<sub>4</sub>, DCPA) and hydroxyapatite (Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>, HAp) are promising biomaterials with wide application in the biomedical field. In this study, we propose a novel method to prepare fiber-like DCPA without organic additives for the first time and show that nanostructured HAp can be synthesized without changing the macroscopic morphology of DCPA. Our results show that temperature, pH, calcium to phosphate ratio (Ca/P) and concentration of NH<sub>4</sub><sup>+</sup> are essential factors in the formation of fiber-like DCPA. The synthesized materials were characterized by PXRD, SEM and TEM, and the DCPA→HAp phase transformation process was examined. The growth of HAp on the DCPA crystal can be regulated by the composition of the hydrolyzing solution, forming HAp with its c-axis perpendicular (HAp (001)// DCPA (100)) or parallel (HAp (001)// DCPA (010)) to the elongation direction of DCPA crystal. At a high concentration of Ca<sup>2+</sup> in NH<sub>4</sub>OH solution, octacalcium phosphate (OCP) was observed as an intermediate phase with its c-axis parallel to elongation of initial DCPA crystal. The HAp crystals formed after complete transformation of the precursor phases have a preferred crystallographic orientation with c-axis co-axial to the elongation direction of DCPA. In the concentrated NH<sub>4</sub>OH solution, the direct transformation of DCPA to HAp was observed. At initial stages of the hydrolysis, the c-axis of newly formed HAp is perpendicular to the elongation direction of DCPA. This study provides a new insight in regulating the crystal growth of DCPA without organic additives and a facile route to form HAp with hierarchical structures. 2019-03-12 Krumova, Marina

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