Nano Biomedicine
Nanocomposite Prepared from Carbon Nanotubes and Hydroxyapatite Precursors

Mamoru OMORI1, Takashi WATANABE1, Masaaki TANAKA1, Akira OKUBO2, Hisamichi KIMURA2, and Toshiyuki HASHIDA1

1Graduate School of Engineering, Tohoku University, Sendai, Japan
2Institute for Materials Research, Tohoku University, Sendai, Japan

Nano Biomedicine 2009;1(2): 137-142, (Dec 30)

Multi-walled carbon nanotubes (MWNTs) and the hydroxyapatite (HA) precursor of CaHPO4EH2O and Ca(OH)2 were mixed in water slurry and sintered at 1200oC at 120 MPa by spark plasma sintering (SPS). MWNTs were dispersed in the composite as agglomerates less than 50 mm in length and 5 mm in width, consisting of MWNTs and alumina nanocrystals smaller than 100 nm. The bulk density and Vickers hardness were decreased with increasing content of MWNTs. The strength of the composite was improved by the addition of MWNTs. Pull-out MWNTs were observed on the fracture surface of the agglomerate and contributed to strengthen the composite.

Key words: carbon nanotube, composite, hydroxyapatite, aluminum hydroxide, spark plasma sintering

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