Meng Y H, Tang Chak Yin, Tsui Chi Pong, Chen Da Zhu
Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
J Mater Sci Mater Med. 2008 Jan;19(1):75-81. doi: 10.1007/s10856-007-3107-5. Epub 2007 Jun 19.
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%.
羟基磷灰石（HA）陶瓷因其良好的生物相容性和骨传导性已被应用于组织工程和骨科领域。然而，其临床应用通常受到低强度和脆性的限制。本研究的目的是开发一种新型的HA复合材料，其中将多壁碳纳米管（MWNTs）引入到HA陶瓷基体中，以提高所得复合材料的力学性能。采用一种简单的化学湿法，在常压下借助表面活性剂和超声技术合成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表征，并将其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。MWNTs用硝酸和硫酸的混合物进行处理。通过溶液共混制备HA/MWNT复合材料。采用热压法对复合材料进行烧结。研究了不同体积百分比MWNTs的HA/MWNT复合材料的力学性能。当MWNTs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%。
