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Title: Self-assembly of nano-hydroxyapatite on multi-walled carbon nanotubes
Authors: Liao, S. 
Xu, G.
Wang, W.
Watari, F.
Cui, F.
Ramakrishna, S. 
Chan, C.K. 
Keywords: Bioinspired
Carbon nanotubes
Issue Date: Sep-2007
Citation: Liao, S., Xu, G., Wang, W., Watari, F., Cui, F., Ramakrishna, S., Chan, C.K. (2007-09). Self-assembly of nano-hydroxyapatite on multi-walled carbon nanotubes. Acta Biomaterialia 3 (5) : 669-675. ScholarBank@NUS Repository.
Abstract: Inspired by self-assembly of nano-hydroxyapatite (nHA) on collagen associated with the 67 nm periodic microstructure of collagen, we used multi-walled carbon nanotubes (MWCNTs) with approximately 40 nm bamboo periodic microstructure as a template for nHA deposition to form a nHA-MWCNT composite. The assembled apatite was analyzed by transmission electron microscopy and scanning electron microscopy. Defects that were analogous to edge dislocations along the carbon nanotubes' multi-walled surfaces were the nucleation sites for nHA after these defects had been functionalized principally into carboxylic groups. Spindle-shaped units consisting of an assembly of near parallel, fibril-like nHA polycrystals were formed and oriented at a certain angle to the long axis of the carbon nanotubes, unlike nHA-collagen in which the nHA is oriented along the longitudinal axis of the collagen molecule. One possible explanation for this difference is that there are more bonds for calcium chelation (-COOH, >C{double bond, long}O) on the collagen fibril surface than on the surface of MWCNTs. Spindle-shaped units that are detached from the MWCNT template are able to maintain the ordered parallel structure of the nHA polycrystal fibril. We have thus created a self-assembled hydroxyapatite on MWCNTs. © 2007 Acta Materialia Inc.
Source Title: Acta Biomaterialia
ISSN: 17427061
DOI: 10.1016/j.actbio.2007.03.007
Appears in Collections:Staff Publications

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