Counterions present in syntheses induce the precipitation of two different populations of Sr-containing hydroxyapatite crystals
Counterions present in syntheses induce the precipitation of two different populations of Sr-containing hydroxyapatite crystals
复制标题
合成中存在的抗衡离子诱导两种不同的含 Sr 羟基磷灰石晶体的沉淀
DOI:
10.1016/j.ceramint.2019.10.177
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发表时间:
2020
影响因子:
5.2
通讯作者:
dos Santos, E.A.
中科院分区:
文献类型:
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作者:
Silva, L.M.;Menezes, D.S.;Narayanan, S.;Shokuhfar, T.;Shahbazian-Yassar, R.;Dalmônico, G.M.L.;Werckmann, J.;Farina, M.;dos Santos, E.A.
The ions found in biological environment during biomineralization as well as the counterions present in syntheses,i.e., the reagents employed, play an important role in the precipitation and stabilization of apatites. In this work, precipitation of strontium-containing hydroxyapatites at different concentrations (0, 20, 40, 60, 80 and 100% Sr2+) was performed in the presence of two counterions typically present in biological environments: Na+and Cl−. It was demonstrated that the presence of Na+/Cl−in the synthesis environment led to the precipitation of a biphasic hydroxyapatite (HAp) system formed by two non-miscible phases: Ca-rich HAp and Sr-rich HAp. The biphasic system was observed for intermediate Sr2+concentrations (20, 40 and 60%) and exhibited greater lattice microstrain compared with the single-phase systems of Ca HAp (0%) and Sr HAp (100%). Although Na+/Cl−were inserted into both Ca- and Sr-rich HAp phases, Cl−ions were preferentially accommodated into the enlarged Sr-rich HAp structure. The presence of Cl−ions in the Sr-rich HAp phase decreased microstrain compared to the Ca-rich phase. After calcination, the biphasic system was transformed into a completely miscible Ca/Sr HAp phase without the formation of other phosphates or oxides.
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影响因子:
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作者:
S. Kannan;J. Rocha;J. Ferreira
通讯作者:
J. Ferreira
影响因子:
4.6
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D. Balzar
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J. A. Yaeger
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H. Henisch
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H. Henisch
影响因子:
41.2
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