Mechanical reinforcement of bioceramics scaffolds via fracture energy dissipation induced by sliding action of MoS2 nanoplatelets
Mechanical reinforcement of bioceramics scaffolds via fracture energy dissipation induced by sliding action of MoS2 nanoplatelets
复制标题
通过 MoS2 纳米片滑动作用引起的断裂能量耗散对生物陶瓷支架进行机械加固
DOI：
10.1016/j.jmbbm.2017.07.027
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Peng Shuping
中科院分区：
文献类型：
--
作者：
Shuai Cijun;Sun Hang;Gao Chengde;Feng Pei;Guo Wang;Yang Youwen;Zhao Mingchun;Yang Sheng;Yuan Fulai;Peng Shuping
尽管生物陶瓷具有良好的生物相容性和生物活性，但其固有的脆性限制了其在承载种植体中的应用。本研究利用二硫化钼纳米片(MSNPs)对选择性激光烧结(SLS)制备的生物陶瓷(Mg2SiO4/CaSiO3)支架进行了增强处理。支架的断裂模式由穿晶断裂向穿晶和沿晶混合断裂转变。可以解释的是，MSNPs由于其弱的层间van der Waals相互作用而容易滑动，并且由于其高的弹性模数而提供弹性变形。这种滑动作用和弹性变形协同作用导致MSNPs的裂纹桥联、裂纹偏转、拔出和断裂。这些效应有效地提高了断裂能量耗散和应变能力，改变了断裂方式，有利于提高断裂韧性和抗压强度。此外，含有MSNPs的支架不仅在模拟体液中形成了生物活性的磷灰石层，而且支持了细胞的黏附和增殖。
The inherent brittleness of bioceramics restricts their applications in load bearing implant, although they possess good biocompatibility and bioactivity. In this study, molybdenum disulfide nanoplatelets (MSNPs) were used to reinforce bioceramics (Mg2SiO4/CaSiO3) scaffolds fabricated by selective laser sintering (SLS). The fracture mode of scaffolds was transformed from transgranular to mixed trans- and intergranular. It could be explained that MSNPs could slide easily due to their weak interlayer van der Waals interactions and provide elastic deformation due to their high elastic modulus. Such sliding action and elastic deformation synergistically induced crack bridging, crack deflection, pull-out and break of MSNPs. Those effects effectively increased the fracture energy dissipation and strain capacity as well as changed the fracture mode, contributing to high fracture toughness and compression strength. Additionally, the scaffolds with MSNPs not only formed a bioactive apatite layer in simulated body fluid, but also supported cell adhesion and proliferation.