羟基磷灰石/单壁碳纳米管复合材料的表征

Characterization of nano-hydroxyapatite/single walled carbon nanotube composite

背景:羟基磷灰石具有接近自然人骨的强韧度和优越的生物相容性,但其力学性能却较差。目的:制成并研究一种新型生物活性材料(羟基磷灰石/单壁碳纳米管复合材料)的各种性质。方法:利用原位合成法制备羟基磷灰石单壁碳纳米管复合材料,并对其红外光谱、微观结构及XDR衍射分析,力学性能进行测试,对不同SWNT含量的SWNT/HAp复合材料弯曲强度与断裂韧性比较分析。结果与结论:成功制备出的纳米羟基磷灰石单壁碳纳米管复合材料,其抗弯强度最大增幅将近50%,达到73MPa;而断裂韧性的最大提高幅度为3倍,达到2.6MPa?m1/2。随着单壁碳纳米管复合材料含量的增加,复合材料的弯曲强度与断裂韧性呈现出缓慢上升的趋势。提示,纳米羟基磷灰石单壁碳纳米管复合材料显著提高了接近自然人骨的纳米级磷灰石骨材料的抗弯强度和断裂韧性,从而克服传统支撑骨材料的力学性能缺陷。

BACKGROUND：Hydroxyapatite has robustness close to natural bone and good biocompatibility,but its mechanical properties are poor.OBJECTIVE：To study the properties of a new bioactive material（nano-hydroxyapatite/single walled carbon nanotube composite,HA/SWNT）.METHODS：HA/SWNT nanoparticles were prepared by using in situ synthesis method.Infrared spectrogram（IR）,microstructure,X-ray diffraction（XRD）,and mechanical properties were detected.The bending strength and fracture toughness of SWNT/HAp composites with different SWNT contents were compared.RESULTS AND CONCLUSION：Bending strength of HA/SWNT nanoparticles increased by 50% maximum,and reached 73 MPa.Its fracture toughness was improved by almost 300% and reached 2.6 MPaom1/2.With the increase of SWNT contents,the bending strength and fracture toughness of the composites were gradually increased.Various performance of HA/SWNT composites are improve greatly to overcome the shortcomings of traditional bone materials.