Journal of Inorganic Materials ›› 2020, Vol. 35 ›› Issue (5): 601-607.DOI: 10.15541/jim20190144

Special Issue: 生物材料论文精选(2020)

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Preparing Biomedical CaCO3/HA Composite with Oyster Shell

LIU Ziyang,GENG Zhen,LI Zhaoyang   

  1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
  • Received:2019-04-04 Revised:2019-04-24 Published:2020-05-20 Online:2019-05-29
  • Supported by:
    National Natural Science Foundation of China(31570970)

Abstract:

To reduce the cost of HA and improve degradation performance of HA, oyster shells were used as raw materials to prepare CaCO3/ hydroxyapatite (HA) composite materials by a hydrothermal method. Phase analysis and SEM/TEM observation revealed that as-prepared CaCO3/HA composites had a morphology of HA nanoparticles growing on the lamellar CaCO3. Three kinds of CaCO3/HA composites (20%HA、40%HA、60%HA) with HA content of 20%, 40% and 60% were prepared by controlling the proportion of calcium and phosphorus. The actual content of HA in three obtained different composites, determined by ICP, were 17.52%, 34.30% and 43.24%, respectively. With the increase of HA content, the specific surface area and thermal stability of CaCO3/HA composite are improved. Samples were immersed in PBS simulated body fluid for 14 d to evaluate their in vitro degradation ability. The results showed that degradation rates of three kinds of composites with different HA contents (20%HA, 40%HA and 60%HA) were 15.2%, 12.0% and 10.8%, respectively. The degradation rate decreased with the increase of HA proportion in the composite. All data indicates that the hydrothermal synthesis of CaCO3/HA composite can control the conversion degree of HA and then adjust the degradation rate of CaCO3/HA composite by designing the ratio of calcium and phosphorus elements, which have potential application in orthopedics.

Key words: oyster shell, hydroxyapatite, calcium carbonate, degradation rate, orthopedic application

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