碳纳米管对羟基磷灰石基复合材料力学性能的影响

将力学性能优良的碳纳米管(CNTs)与羟基磷灰石(HA)生物陶瓷相复合,发展CNTs/HA复合材料来应用于骨组织修复领域,有望解决HA生物陶瓷力学性能的不足。通过3种不同的制备方法,即通过表面活性剂将CNTs分散在HA基体中、通过酸碱中和反应将CNTs与HA共沉淀以及通过体外浸泡在CNTs上矿化生长HA等方法来获得CNTs/HA复合材料。深入研究CNTs的表面结构和分散状态对CNTs/HA复合材料力学性能的影响。结果表明,CNTs的添加改变了HA的脆性,导致复合材料抗压力学性能得到提高。但是,由于复合材料制备方法的不同,导致CNTs在HA基体中的分散状态、表面结构的完整性以及与HA的界面结合情况不同,导致其抗压力学性能不同。其中,通过表面活性剂将CNTs分散在HA基体中而获得复合材料的抗压力学性能表现最好,而CNTs与HA通过共沉淀法所获得复合材料的抗压力学性能表现最差。

Effect of Carbon Nanotubes on the Mechanical Properties of Carbon Nanotubes/Hydroxyapatite Composites

In order to overcome the brittleness of hydroxyapatite (HA) bioceramics, it is suggested to be an efficient approach to fabricate carbon nanotubes (CNTs)/HA composites by compounding CNTs with HA for the clinic applications in bone tissue engineering. CNTs/HA composites had been fabricated by three different methods, that was CNTs dispersing into HA with the addition of surfactant, CNTs coprecipitating with HA via an acid-base reaction, and HA growing on CNTs by a mineralization approach. The results showed that CNTs/HA composites exhibited a certain plastic deformation under the compress load condition and the compressive mechanical properties had been increased owing to the existence of CNTs in these composites. For the uniform distribution and network array of CNTs with slightly damaged structure in HA matrix and good interfacial bonding between CNTs and HA, CNTs/HA composites prepared by CNTs dispersing into HA with the addition of surfactant have the best compressive mechanical properties. However, CNTs/HA composites prepared by CNTs coprecipitating with HA via an acid-base reaction have the worst compressive mechanical properties for the uneven distribution and aggregating array of CNTs with greatly damaged structure in HA matrix.