Preparation and structure of calcium hydroxyapatite substituted with light rare earth ions
Preparation and structure of calcium hydroxyapatite substituted with light rare earth ions
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DOI：
10.1016/j.colsurfa.2011.10.024
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
A. Yasukawa;K. Gotoh;Hidekazu Tanaka;K. Kandori
中科院分区：
文献类型：
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作者：
A. Yasukawa;K. Gotoh;Hidekazu Tanaka;K. Kandori
本研究从不同Ln/（Ln+Ca）原子比（[XLn]）的水溶液中合成了五种含轻稀土离子（Ln 3+：La 3+，Ce 3+，Pr 3+，Nd 3+和Sm 3+）和Ca 2+的羟基磷灰石（Hap）颗粒。通过多种手段研究了产物的晶相及其内部和表面结构。稀土金属离子Ln 3+与CaHap形成固溶体，固溶体的[XLn]≤0.01 ~ 0.03。在[XLn]>0.01-0.03范围内，LnCaHap和LnPO_4的混合物在每个Ln体系中形成。Ln 3+离子强烈影响颗粒的结构，虽然只有少量的Ln 3+离子被纳入到Hap晶体。随着[XLn]的增大，所制备的颗粒先变长后变小。粒子的结晶度发生了变化，对应于它们的尺寸的变化。紫外-可见光谱研究表明，Ce掺杂的Hap在400 nm以下有较强的紫外吸收。
The present study synthesized five types of hydroxyapatite (Hap) particles containing light rare earth ions (Ln3+: La3+, Ce3+, Pr3+, Nd3+and Sm3+) and Ca2+ions from aqueous solutions with different Ln/(Ln+Ca) atomic ratios ([XLn]) ranging from 0 to 0.15. The crystal phases of the products and their inner and surface structures were investigated by various means. Ln3+ions were incorporated into the CaHap crystals and formed rare earth metal–calcium hydroxyapatite (LnCaHap) solid solutions at [XLn]≤0.01–0.03. A mixture of LnCaHap and LnPO4was formed in each Ln system at [XLn]>0.01–0.03. Ln3+ions strongly affected the structure of the particles, although only a small quantity of Ln3+ions was incorporated into the Hap crystals. With increasing [XLn], the prepared particles first became longer and then became smaller. The crystallinity of the particles was altered, corresponding with the variation of their size. UV–vis measurements revealed that Ce-contained Hap exhibits strong UV absorption under 400nm.