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Influence of Sintering Temperature on Pore Structure and Apatite Formation of a Sol–Gel-Derived Bioactive Glass

Authors

  • Bo Lei,

    Corresponding author
    1. Biomedical Engineering Institute, South China University of Technology, Guangzhou 510640, ChinaThe Key Laboratory of Specially Functional Materials, South China University of Technology, Guangzhou 510640, China
      †Author to whom correspondence should be addressed. e-mails: Chenxf@scut.edu.cn; leiboaray@yahoo.com.cn
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  • Xiaofeng Chen,

    Corresponding author
    1. Biomedical Engineering Institute, South China University of Technology, Guangzhou 510640, ChinaThe Key Laboratory of Specially Functional Materials, South China University of Technology, Guangzhou 510640, China
      †Author to whom correspondence should be addressed. e-mails: Chenxf@scut.edu.cn; leiboaray@yahoo.com.cn
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  • Yingjun Wang,

    1. Biomedical Engineering Institute, South China University of Technology, Guangzhou 510640, ChinaThe Key Laboratory of Specially Functional Materials, South China University of Technology, Guangzhou 510640, China
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  • Naru Zhao,

    1. Biomedical Engineering Institute, South China University of Technology, Guangzhou 510640, ChinaThe Key Laboratory of Specially Functional Materials, South China University of Technology, Guangzhou 510640, China
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  • Chang Du,

    1. Biomedical Engineering Institute, South China University of Technology, Guangzhou 510640, ChinaThe Key Laboratory of Specially Functional Materials, South China University of Technology, Guangzhou 510640, China
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  • Liming Fang

    1. Biomedical Engineering Institute, South China University of Technology, Guangzhou 510640, ChinaThe Key Laboratory of Specially Functional Materials, South China University of Technology, Guangzhou 510640, China
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  • D. Brauer—contributing editor

  • The research was supported by National Natural Science Foundation of China (grant no. 50672028, 50702023) and the key project of the National Natural Science Foundation of China (grant no. 50830101, 50732003).

†Author to whom correspondence should be addressed. e-mails: Chenxf@scut.edu.cn; leiboaray@yahoo.com.cn

Abstract

The aim of this work was to investigate the influence of sintering temperature on the porous morphology, pore-size distribution, and apatite formation of sol–gel-derived porous bioactive glasses. For this purpose, three porous bioactive glasses were prepared by thermal phase separation cotemplate method in sol–gel process followed by sintering at 600°, 800°, and 1000°C. Pore structure of samples was characterized by various methods. The in vitro apatite formation test was carried out in simulated body fluid. The results showed that sintered bioactive glasses at 600°C exhibited a bimodal pore size distribution, mesopores, and nanopores (8–100 nm), macropores (100 nm–1 μm), and nanoscale pore walls (about 100 nm in width). The increase of sintering temperature induced the presence of a submicrometer pore-size distribution (300 nm–3 μm) with nanoscale pore walls (about 200 nm in width) and a morphological transformation from particle-like pore walls to dense pore walls. Depending on this porous structure, as-synthesized samples exhibited faster apatite formation capability.

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