Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 75, Issue -, Pages 423-433Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmbbm.2017.07.027
Keywords
Molybdenum disulfide nanoplatelets; Bioceramics scaffold; Mechanical properties; Biocompatibility
Funding
- Natural Science Foundation of China [51575537, 81572577]
- Overseas, Hong Kong & Macao Scholars Collaborated Researching Fund of National Natural Science Foundation of China [81428018]
- Hunan Provincial Natural Science Foundation of China [14JJ1006, 2016JJ1027]
- Project of Innovation-driven Plan of Central South University [2015CXS008, 2016CX023]
- Open-End Fund for the Valuable and Precision Instruments of Central South University
- Fund of the State Key Laboratory for Powder Metallurgy
- Fund of the State Key Laboratory of Solidifcation Processing in NWPU [SKLSP201605]
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts396]
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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.
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