Abstract
Homogeneous nanocomposites composed of hydroxyapatite (HAp) and collagen were synthesized using a novel in situ precipitation method through dual template-driven. The morphological and componential properties of nanocomposites were investigated. The HAp particulates, in sizes of about 50–100 nm, were distributed homogeneously in the organic collagen hydrogel. Highly magnified TEM observation showed that HAp inorganic particles were composed of fine sub-particles (2–5 nm) without regular crystallographic orientation. Based on these homogeneous nanocomposites, a novel HAp/collagen nanocomposite scaffold with hierarchical porosity was prepared by multilevel freeze-drying technique. Compared to other conventional scaffolds for tissue engineering, this novel in situ method endows synthesized composite scaffolds with unique morphology—ultrafine HAp particles dispersed homogenously in collagen at nano level and the foam scaffold with hierarchical pore structures. The mechanical performance increased obviously compared with neat collagen. These results provided an efficient approach toward new biomimetic tissue scaffold for the biomedical applications with enhanced intensity/bioactivity and controlled resorption rates. This novel method, we expect, will lead to a wide application in many other hydrogel systems and may be useful for fabrication of various homogeneous inorganic/organic nanocomposites.
Similar content being viewed by others
References
Shin H, Jo S, Mikos AG. Biomimetic materials for tissue engineering. Biomaterials. 2003;24:4353–64.
Sergey VD, Matthias E. Biological and medical significance of calcium phosphates. Angew Chem Int Ed. 2002;41:3130–46.
Murugan R, Ramakrishna S. Development of nanocomposites for bone grafting. Compos Sci Technol. 2005;65:2385–406.
Kim HW, Jonathan CK, Hyoun EK. Hydroxyapatite and gelatin composite foams processed via novel freeze-drying and crosslinking for use as temporary hard tissue scaffolds. J Biomed Mater Res. 2004;72A:136–45.
Yin YJ, Zhao F, Song XF, Yao KD, Lu WW, Leong JC. Preparation and characterization of hydroxyapatite/chitosan–gelatin network composite. J Appl Polym Sci. 2000;77:2929–38.
Wei GB, Peter XM. Structure and properties of nano-hydroxyapatite/polymer composite scaffolds for bone tissue engineering. Biomaterials. 2004;25:4749–57.
Zhang W, Liao SS, Cui FZ. Hierarchical self-assembly of nano-fibrils in mineralized collagen. Chem Mater. 2003;15:3221–6.
Taguchi T, Kishida A, Akashi M. Apatite formation on/in hydrogel matrices using an alternate soaking process. II. Effect of swelling ratios of poly(vinyl alcohol) hydrogel matrices on apatite formation. J Biomater Sci. 1999;10:331–9.
Doi Y, Horiguchi T. Formation of apatite–collagen complexes. J Biomed Mater Res. 1996;31:43–9.
Kischi M, Itoh S. Self-organization mechanism in a bone-like hydroxyapatite/collagen nanocomposite synthesized in vitro and its biological reaction in vivo. Biomaterials. 2001;22:1705–11.
Song J, Saiz E, Bertozzi CR. A new approach to mineralization of biocompatible hydrogel scaffolds: an efficient process toward 3-dimensional bonelike composites. J Am Chem Soc. 2003;125:1236–43.
Imai H, Tatara S, Furuichi K, Oaki Y. Formation of calcium phosphate having a hierarchically laminated architecture through periodic precipitation in organic gel. Chem Commun. 2003;15:1952–3.
Chang MC, Ko CC, Douglas WH. Preparation of hydroxyapatite–gelatin nanocomposite. Biomaterials. 2003;24:2853–62.
Kim HW, Knowles JC, Kim HE. Porous scaffolds of gelatin–hydroxyapatite nanocomposites obtained by biomimetic approach: characterization and antibiotic drug release. J Biomed Mater Res. 2005;74(B):686–98.
Tong H, Ma WT, Wang LL, Wan P, Hu JM, Cao LX. Control over the crystal phase, shape, size and aggregation of calcium carbonate via a l-aspartic acid inducing process. Biomaterials. 2004;25:3923–9.
Masanori K, Hiroko NM, Takeki Y, Yoshihisa K, Kazuo T, Junzo T. Glutaradehyde cross-linked hydroxyapatite/collagen self-organized nanocomposites. Biomaterials. 2004;25:63–9.
Kim HW, Kim HE, Salih V. Stimulation of osteoblast responses to biomimetic nanocomposites of gelatin–hydroxyapatite for tissue engineering scaffolds. Biomaterials. 2005;26:5221–30.
Woodard JR, Hilldore AJ, Lan SK. The mechanical properties and osteoconductivity of hydroxyapatite bone scaffolds with multi-scale porosity. Biomaterials. 2007;28:45–54.
Acknowledgments
This research was financed by National Natural Science Foundation of China (30900297 to XY Shen) and the Research Fund for the Doctoral Program of Higher Education (20090141120055 to XY Shen).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Shen, X., Chen, L., Cai, X. et al. A novel method for the fabrication of homogeneous hydroxyapatite/collagen nanocomposite and nanocomposite scaffold with hierarchical porosity. J Mater Sci: Mater Med 22, 299–305 (2011). https://doi.org/10.1007/s10856-010-4199-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10856-010-4199-x