Fabrication and characterization of needle-like nano-HA and HA/MWNT composites
Fabrication and characterization of needle-like nano-HA and HA/MWNT composites
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DOI：
10.1007/s10856-007-3107-5
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发表时间：
2008-01-01
影响因子：
3.7
通讯作者：
Chen, Da Zhu
中科院分区：
文献类型：
--
作者：
Meng, Y. H.;Tang, Chak Yin;Chen, Da Zhu
羟基磷灰石（HA）陶瓷因其良好的生物相容性和骨传导性而被应用于组织工程和骨科领域。然而，其临床应用通常因强度低和脆性而受到限制。本研究的目的是开发一种新型 HA 复合材料，其中将多壁碳纳米管 (MWNT) 引入 HA 陶瓷基体中，以提高所得复合材料的机械性能。采用简单的化学湿法，借助表面活性剂和超声技术在常压下合成HA陶瓷颗粒。通过 XRD 和 TEM 对合成的 HA 的形貌和微观结构进行了表征，作为处理时间的函数。结果表明，合成的HA颗粒呈针状，沿(211)方向长度为80-160 nm，长径比为5-15。 MWNT 用硝酸和硫酸的混合物进行处理。 HA/MWNT 复合材料通过溶液共混制备。采用热压法烧结复合材料。研究了不同 MWNT 体积百分比的 HA/MWNT 复合材料的机械性能。当MWNT的体积百分比达到7%时，断裂韧性和弯曲强度分别提高了50%和28%。
Hydroxyapatite (HA) ceramic has been used in tissue engineering and orthopedics for its good biocompatibility and osteoconductivity. However, its clinical applications are usually limited by the low strength and brittleness. The objective of this research was to develop a new kind of HA composites in which multi-wall carbon nanotubes (MWNTs) were introduced to the HA ceramic matrix to improve the mechanical properties of the resulting composites. A simple chemical wet method was applied to synthesize the HA ceramic particles with the aid of surfactant and ultrasonication technique at normal atmospheric pressure. The morphology and microstructure of the synthesized HA were characterized by XRD and TEM as a function of treatment time. The results showed that the synthesized HA particles are needle-like with a length of 80-160 nm along the (211) direction and an aspect ratio of 5-15. MWNTs were treated with a mixture of nitric acid and sulfuric acid. The HA/MWNT composites were prepared by solution blending. The composites were sintered using a hot-press method. The mechanical properties of the HA/MWNT composites with different volume percentages of MWNTs were examined. The fracture toughness and flexural strength were improved by 50% and 28% separately when the volume percentage of MWNTs reached 7%.