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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Synthesis and characterization of silver/silicon-cosubstituted nanohydroxyapatite.
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Synthesis and characterization of silver/silicon-cosubstituted nanohydroxyapatite.

机译：银/硅共取代的纳米羟基磷灰石的合成与表征。

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Favorable cell-material interaction and the absence of undesirable reaction from the host body defence system play a critical role in determining the success and long-term survival of the implants. Substitution of various elements into hydroxyapatite (HA) has been done to alter its chemical composition, thereby mimicking that of the bone mineral. In this study, a cosubstituted nanosized apatite (Ag/Si-HA) containing Ag (0.3 wt %) and Si (0.8 wt %) was synthesized by an aqueous precipitation technique. The synthesized Ag/Si-HA displayed a rod-like morphology of dimensions ~50 nm in length and ~15 nm in width, as observed from the transmission electron microscope image. With an increase in temperature, the aspect ratio of nanosized Ag/Si-HA decreased, whilst the size increased. Autoclaving was used to achieve sufficient crystallinity while maintaining the rod-like morphology and size that were comparable to that of the bone apatite. A pure Ag/Si-HA was produced without any undesirable secondary phases, as evidenced from the X-ray diffraction and thermal gravimetric results. The Ag/Si cosubstitution affected the lattice cell parameters, in particularly the a- and c- axes which further led to an expansion of the unit cell volume. In addition, the relative intensity of the hydroxyl vibrational bands was reduced. These results demonstrated that a stable phase-pure Ag/Si-HA was produced using an aqueous precipitation reaction.
机译：良好的细胞材料相互作用以及宿主防御系统的不存在不良反应在决定植入物的成功与长期存活中起着至关重要的作用。已经完成了将各种元素代入羟基磷灰石（HA）的操作，以改变其化学成分，从而模仿骨骼矿物质的化学成分。在这项研究中，通过水沉淀技术合成了包含Ag（0.3 wt％）和Si（0.8 wt％）的共取代纳米级磷灰石（Ag / Si-HA）。从透射电子显微镜图像中观察到，合成的Ag / Si-HA呈棒状形态，长约50 nm，宽约15 nm。随着温度的升高，纳米尺寸的Ag / Si-HA的长径比减小，而尺寸增大。使用高压灭菌来获得足够的结晶度，同时保持与骨磷灰石相当的棒状形态和尺寸。从X射线衍射和热重分析结果可以看出，制得的纯Ag / Si-HA没有任何不希望的第二相。 Ag / Si共取代影响晶格参数，特别是a轴和c轴，这进一步导致晶胞体积的扩大。另外，降低了羟基振动带的相对强度。这些结果表明，使用水性沉淀反应可产生稳定的纯相Ag / Si-HA。

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