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In this study, Al 2 O 3 triply periodic minimal surface (TPMS) scaffolds with cell sizes of 5 mm, 8.5 mm, and 12 mm were prepared by vat photopolymerization 3D printing, and Al 2 O 3 /Al ceramic-metal hybrid structures were subsequently obtained by the metal infiltration of AlSi10Mg. To investigate the influence of cell size on the mechanical properties of vat photopolymerization 3D printed Al 2 O 3 TPMS scaffolds and Al 2 O 3 /Al hybrid structures, quasi-static compression and dynamic impact experiments were conducted, and the failure modes during experiments were discussed. It was shown that the quasi-static compression and dynamic impact properties of Al 2 O 3 TPMS scaffolds gradually decreased with the increase in cell size, the compression strength decreased from 15.2 MPa to 8 MPa and the impact strength decreased from 37 MPa to 11 MPa, respectively, which was related to the stress transfer ability of the single cell. In contrast, the effects of cell size on the performance of Al 2 O 3 /Al hybrid structures were opposite. When the cell size increased, the quasi-static compression performances of the Al 2 O 3 /Al hybrid structure were greatly improved, and the compression strength increased from 175 MPa to 250 MPa. The impact resistances of the Al 2 O 3 /Al hybrid structure were further studied. The highest impact strength of the Al 2 O 3 /Al hybrid structure was 290.74 MPa. With the increase in cell size, the impact resistance of the Al 2 O 3 /Al hybrid structure had a gradual improvement trend. Under the cyclic impact, the Al 2 O 3 /Al hybrid structure showed a high impact strength and energy absorption capacity, which was mainly related to the metal phase content around the cell, i.e., the coherence of the metal phase. This study is believed to give help for the structural design of ceramic scaffolds and ceramic-metal hybrid structures. • Al 2 O 3 TPMS and Al 2 O 3 /Al hybrid structures were prepared by vat photopolymerization and metal infiltration. • Quasi-static compressive and cyclic dynamic impact performances were investigated. • The effects of cell size of triply periodic minimal surface scaffolds were discussed. [ABSTRACT FROM AUTHOR]

Nowadays, metal oxalates with high discharge/charge capacities were chosen as new anode materials for batteries. Here, novel nickel oxalates microtubes with manganese doping and graphene Oxide (Ni 0.8 Mn 0.2 C 2 O 4 ∙2 H 2 O/GO) are synthesized at low temperature through a facile microwave-assisted solvothermal method. The X-ray diffraction confirmed a formation of a pure binary compound of Ni 0.8 Mn 0.2 C 2 O 4 ∙2 H 2 O/GO without contamination by other compounds of Nickel or Manganese. Furthermore, the formed product shows a good crystallinity and has a high surface area of 24.3 m2 g−1. With the assistance of graphene, the material delivers a high discharge capacity of 1781 mA h g−1. Even at high current densities of 5.0 and 10.0 A g−1, discharge capacities of 1138.1 and 891.0 mA h g−1 can be obtained. Encouraged by the superior rate performance, the long-term cycling performance at 10 A g−1 and 20 A g−1 was tested showing a discharge of 676.6 mA h g−1 after 300 cycles and 346.4 mA h g−1 after 1000 cycles. The remarkable electrochemical performance can be attributed to the doping of Mn in the structure of NiC 2 O 4 ∙2 H 2 O and the contribution of graphene. • Ni 0.8 Mn 0.2 C 2 O 4 ∙2 H 2 O/GO composite is obtained using microwave treatment. • The material delivers a high discharge capacity of 1781 mAh g−1. • Even at 10 A·g−1, discharge capacity of 891.0 mAh·g−1 is obtained. • Discharge capacity of 346.4 mAh·g−1 is retained at 20 A·g−1 after 1000 cycles. [ABSTRACT FROM AUTHOR]