The aim of the present study was to study the mechanical and biologocal properties of the bredigite-magnetite (Ca 7 MgSi 4 O 16 -Fe 3 O 4 ) nanocomposite with various amounts of magnetite (0, 10, 20 and 30 wt. %). According to the obtained results, the properties of the constructed scaffolds have an extreme dependence on the magnetite content. In this research, the bredigite-30wt. % magnetite as the optimum sample showed a fracture toughness of 2.69 MPa m 1/2 and a Young's modulus of 29 GPa. Increasing bredigite content led to the increase of pH values in the SBF solution. This was originated from the interchange/interaction of Ca 2+ ion on the scaffold surface. The sample containing 10 wt. % magnetite presented a rocky and irregular surface while that of 30 wt.% illustrated a smooth and flat outer layer with coarse projections. The results confirmed that the biodegradation rate of the pure bredigite is more than that of 20 wt.% sample. The event is originated from the dissolution of the Si ions of the bridigite particles in the absence of magnetite.

中文翻译：

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Bredigite-Magnetite (Ca 7 MgSi 4 O 16 -Fe 3 O 4 ) 纳米复合支架的力学和生物学特性

本研究的目的是研究 bredigite-磁铁矿（Ca 7 MgSi 4 O 16 -Fe 3 O 4 ）纳米复合材料与不同数量的磁铁矿（0、10、20 和 30 重量％）的机械和生物特性。 . 根据获得的结果，构建的支架的性能对磁铁矿含量有极大的依赖性。在这项研究中，bredigite-30wt。% 磁铁矿作为最佳样品显示出 2.69 MPa m 1/2 的断裂韧性和 29 GPa 的杨氏模量。增加 bredigite 含量导致 SBF 溶液中 pH 值的增加。这源于支架表面上 Ca 2+ 离子的交换/相互作用。样品含有 10 重量。% 的磁铁矿呈现岩石和不规则的表面，而 30 wt.% 的磁铁矿表现出光滑平坦的外层和粗糙的突起。结果证实纯 bredigite 的生物降解率大于 20 wt.% 样品的生物降解率。该事件起源于在没有磁铁矿的情况下 bridite 颗粒的 Si 离子的溶解。