羟基磷灰石/碳纳米管复合材料的制备及表征

Preparation and Characterization of Hydroxyapatite/Carbon Nanotubes Composites

主要研究了原位合成法制备羟基磷灰石/碳纳米管复合材料过程中不同因素对最终产物的影响。研究发现浓硝酸氧化处理可以在碳纳米管表面缺陷处引入大量羧基与羟基,这些官能团一方面可以提高碳纳米管在水中的分散性,另一方面在溶液中可以吸附钙离子,进而原位合成复合材料。XRD分析表明pH值是复合材料制备过程中的关键因素,pH>10时,复合材料中仅有碳纳米管和羟基磷灰石两种物相,其中纳米级的短棒状羟基磷灰石均匀吸附在碳纳米管表面,与之形成较强的界面结合;pH值小于8时,复合材料由层片状的CaHPO4.2H2O和CNTs构成。

The influence of different preparation factors on the properties and microstructure of hydroxyapatite（HAp） / carbon nanotubes（CNTs） was investigated.The results showed that MWNTs were functionalized with hydroxyl and carboxyl groups after oxidation,which can not only increase the solubility of CNTs,but also attract calcium cation in liquor and form composites in succession.It was also found that pH value was the most important factor during the fabrication of composites by XRD.Hydroxyapatite nucleated and crystallized on the surface of functionalized MWNTs when pH value was more than 10;But,it came to be CaHPO4·2 H2O when pH value was less than 8.