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Fukao K, Nonoyama T, Kiyama R, Furusawa K, Kurokawa T, Nakajima T, Gong JP. Anisotropic Growth of Hydroxyapatite in Stretched Double Network Hydrogel. ACS Nano 2017; 11:12103-12110. [PMID: 29077392 DOI: 10.1021/acsnano.7b04942] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Bone tissues possess excellent mechanical properties such as compatibility between strength and flexibility and load bearing owing to the hybridization of organic/inorganic matters with anisotropic structure. To synthetically mimic such an anisotropic structure of natural organic/inorganic hybrid materials, we carried out hydroxyapatite (HAp) mineralization in stretched tough double network (DN) hydrogels. Anisotropic mineralization of HAp took place in stretched hydrogels, as revealed by high brightness synchrotron X-ray scattering and transmission electron microscopic observation. The c-axis of mineralized HAp aligned along the stretching direction, and the orientation degree S calculated from scattering profiles increased with increasing in the elongation ratio λ of the DN gel, and S at λ = 4 became comparable to that of rabbit tibial bones. The morphology of HAp polycrystal gradually changed from spherical to unidirectional rod-like shape with increased elongation ratio. A possible mechanism for the anisotropic mineralization is proposed, which would be one of the keys to develop mechanically anisotropic organic/inorganic hybrid materials.
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Affiliation(s)
- Kazuki Fukao
- Graduate School of Life Science, ‡Faculty of Advanced Life Science, §Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), and ∥Department of High Toughness Hydrogels for Cartilage Application, Center for Innovation and Business Promotion, Hokkaido University , Sapporo 001-0021, Japan
| | - Takayuki Nonoyama
- Graduate School of Life Science, ‡Faculty of Advanced Life Science, §Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), and ∥Department of High Toughness Hydrogels for Cartilage Application, Center for Innovation and Business Promotion, Hokkaido University , Sapporo 001-0021, Japan
| | - Ryuji Kiyama
- Graduate School of Life Science, ‡Faculty of Advanced Life Science, §Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), and ∥Department of High Toughness Hydrogels for Cartilage Application, Center for Innovation and Business Promotion, Hokkaido University , Sapporo 001-0021, Japan
| | - Kazuya Furusawa
- Graduate School of Life Science, ‡Faculty of Advanced Life Science, §Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), and ∥Department of High Toughness Hydrogels for Cartilage Application, Center for Innovation and Business Promotion, Hokkaido University , Sapporo 001-0021, Japan
| | - Takayuki Kurokawa
- Graduate School of Life Science, ‡Faculty of Advanced Life Science, §Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), and ∥Department of High Toughness Hydrogels for Cartilage Application, Center for Innovation and Business Promotion, Hokkaido University , Sapporo 001-0021, Japan
| | - Tasuku Nakajima
- Graduate School of Life Science, ‡Faculty of Advanced Life Science, §Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), and ∥Department of High Toughness Hydrogels for Cartilage Application, Center for Innovation and Business Promotion, Hokkaido University , Sapporo 001-0021, Japan
| | - Jian Ping Gong
- Graduate School of Life Science, ‡Faculty of Advanced Life Science, §Global Station for Soft Matter, Global Institution for Collaborative Research and Education (GI-CoRE), and ∥Department of High Toughness Hydrogels for Cartilage Application, Center for Innovation and Business Promotion, Hokkaido University , Sapporo 001-0021, Japan
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