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Hydroxyapatite(HAP,Ca10(PO4)6(OH)2in one of the quite important bone implant materials.The hydroxyapatite crystals were synthesized under hydrothermal condition.The specimen was verified to be HAP crystal by the X-ray powder diffractometry(XRD).Then the specimen was distinguished single crystal from polycrystal by the use of the transmission electron microscope(TEM).The diffraction pattern of the specimen is neatly affanged diffraction spots,that verified the crystals were single crystals.The interplanar distance d calculated from diffraction spot is coincided with that of HAP‘s JCPD card.Moreover,crystal face angles calculated from crystal face index are coincided with the values by measuring on the pattern.The HAP crystals are needle-like in shape with about 3μm in diameter and 180μm in length.Most of the crystals are whiskers.Their length/diameter ratio ranges from 40 to 100.The average ratio is about 60. 相似文献
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间歇式溶液添加法制备片状HAP 总被引:1,自引:0,他引:1
在研究HAP的表面结构、表面电荷性能、表面吸附特性的基础上,对现有的水溶液制备HAP的方法进行改进,不用通常的缓慢而持续滴加反应溶液的方法,而采用间歇式反应溶液滴加法,再通过控制溶液的pH值(7.0-7.5)以及反应溶液的添加次序等,最终得到片状HAP晶体。用X-射线衍射分析,红外光谱分析,扫描电镜形貌观察,对片状HAP的性能及结构进行分析,并对Cl^-的作用机理进行了初步探讨。 相似文献
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纳米HAP粒子在水介质中的分散稳定性研究 总被引:1,自引:0,他引:1
在水分散体系中采用化学沉淀法制备纳米羟基磷灰石(Hydroxyapatite,HAP)粒子,研究了分散介质pH值、稳定剂或表面改性剂及其分子量等因素对纳米粒子粒径及分散稳定性的影响,重点讨论了阴离子表面活性剂PAA-Na(聚丙烯酸纳)对纳米HAP溶胶分散稳定性的影响。同时对纳米HAP溶胶分散稳定性机理在理论上作了探讨。 相似文献
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目的:探讨影响纳米羟基磷灰石溶胶分散性能的因素。方法:以水分散体系下,采用化学共沉淀法制备的纳米HAP,研究了反应介质pH值、稳定剂或表面改性剂等因素对纳米粒子粒径及分散稳定性的影响。结果:调节介质的pH值,使颗粒间处于较高的静电效应,在此条件下加入表面活性剂,使颗粒间又具有空间位阻稳定效应,空间位阻稳定效应可阻止颗粒间的团聚。结论:通过优化实验条件可制得高度均匀分数状态纳米羟基磷灰石溶胶。 相似文献
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王友法 《武汉理工大学学报(材料科学英文版)》2001,(3)
Hydroxyapatite whiskers were prepared by the homogeneous precipitation method. Soluble calcium ion and phosphate ion were used as initial materials, they were refluxed respectively at 85℃ , 90℃ and 95℃ for various lengths of time. A proper precipitation agent was selected to control the releasing speed of ions in the system; it induced the hydraxyapatite crystal to grow in a desired way. The pH values of each solutions were measured continuously during the reaction. After the reaction, the products were characterized by X- ray powder dif-fractometry (XRD), scanning electron microscopy ( SEM) and infrared spectroscopy (IR). It is shown that long hydroxyapatite whiskers were obtained under the conditions of 95℃ - 48h and 90℃ - 12h, 85℃ - 120h. 相似文献