期刊
ACTA BIOMATERIALIA
卷 5, 期 2, 页码 661-669出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2008.09.022
关键词
Collagen; Hydroxyapatite; Gradient scaffold; Microstructure
资金
- Wellcome Trust [074486] Funding Source: Medline
This paper reports an in situ diffusion method for the fabrication of compositionally graded collagen/nanohydroxyapatite (HA) composite scaffold. The method is diffusion based and causes the precipitation of nano-HA crystallites in situ. A collagen matrix acts as a template through which calcium ions (Ca2+) and phosphate ions (PO43-) diffuse and precipitate a non-stoichiometric HA. It was observed that needle-like prismatic nano-HA crystallites (about 2 x 2 x 20 nm) precipitated in the interior of the collagen template onto the collagen fibrils. Chemical and microstructural analysis revealed a gradient of the Ca to P ratio across the width of the scaffold template, resulting in the formation of a Ca-rich side and a Ca-depleted side of scaffold. The Ca-rich side featured low porosity and agglomerates of the nano-HA crystallites, while the Ca-depleted side featured higher porosity and nano-HA crystallites integrated with collagen fibrils to form a porous network structure. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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