Improved Mechanical Properties of Ultra-High Shear Force Mixed Reduced Graphene Oxide/Hydroxyapatite Nanocomposite Produced Using Spark Plasma Sintering

Abstract

The addition of nanomaterials, such as graphene and graphene oxide, can improve the mechanical properties of hydroxyapatite (HA) nanocomposites (NCPs). However, both the dispersive state of the starting materials and the sintering process play central roles in improving the mechanical properties of the final HA NCPs. Herein, we studied the mechanical properties of a reduced graphene oxide (r-GO)/HA NCP, for which an ultra-high shear force was used to achieve a nano-sized mixture through the dispersion of r-GO. A low-temperature, short-duration spark plasma sintering (SPS) process was used to realize high-density, non-decomposing r-GO/HA NCPs with an improved fracture toughness of 97.8% via the addition of 0.5 wt.% r-GO. Greater quantities of r-GO improve the hardness and the fracture strength. The improved mechanical properties of r-GO/HA NCPs suggest their future applicability in biomedical engineering, including use as sintered bodies in dentistry, plasma spray-coatings for metal surfaces, and materials for 3D printing in orthopedics.

Cascade Regulation of the Proliferation, Recruitment, and Differentiation of Stem Cells to Prevent Aseptic Loosening by GNPs/ECPP Particles Responding to Macrophages: In Vitro and In Vivo

“…Therefore, the morphology of samples showed the consistency in the orientation of grains. , SPS can finish the consolidation at a relative low temperature in few minutes. Due to low sintering temperature and short sintering time, SPS can inhibit the grain growth of SPS-products. , Besides, graphene is located between ECPP grains during crystallization, which also prevents the grains from growing. , When the graphene increased to 1%, due to the large specific surface area and the dose dependency of graphene, , the overlapped GNPs aggregate at grain boundaries …”

Fabrication of Novel 3-D Nanocomposites of HAp–TiC–h-BN–ZrO2: Enhanced Mechanical Performances and In Vivo Toxicity Study for Biomedical Applications

“…To enhance the mechanical as well as biological properties of pure HAp, some polymers like chitosan, polyethylene, agarose, collagen, polyurethane, polyesters, , polyamide66, cellulose, and its derivatives − have been introduced successfully . Some other biomaterials on either binary or ternary systems were also substituted into pure HAp, and various biocomposite of HAp/SiO 2 /MgO/ZrO 2 /h-BN/La 2 O 3 /TiO 2 /r-GO/Al 2 O 3 /TiC − with improved mechanical behavior without changing their biological properties were fabricated.…”