Dataset Information

Structure Determination, Mechanical Properties, Thermal Stability of Co₂MoB₄ and Fe₂MoB₄.

ABSTRACT: The precise determination of atomic position of materials is critical for understanding the relationship between structure and properties, especially for compounds with light elements of boron and single or multiple transition metals. In this work, the single crystal X-ray diffraction is employed to analyze the atomic positions of Co₂MoB₄ and Fe₂MoB₄ with a Ta₃B₄-type structure, and it is found that the lengths of B-B bonds connecting the two zig-zag boron chains are 1.86 Å and 1.87 Å, but previously unreported 1.4 Å. Co and Fe atoms occupy the same crystallographic position in lattice for the doped samples and the valence is close to the metal itself, and Co/Fe K-edge X-ray Absorption Fine Structure(XAFS) spectra of borides with different ratios of Co to Fe are collected to detect the local environment and chemical valence of Co and Fe. Vickers hardness and nano indentation measurements are performed, together with the Density Functional Theory (DFT) calculations. Finally, Co₂MoB₄ possess better thermal stability than Fe₂MoB₄ evaluated by Thermogravimetric Differential Thermal Analysis (TG-DTA) results.

SUBMITTER: Zhao S

PROVIDER: S-EPMC9102238 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature

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Publications

Structure Determination, Mechanical Properties, Thermal Stability of Co2MoB4 and Fe2MoB4.

Zhao Shijing S Zhou Wenju W Xiang Xiaojun X Cao Xuyan X Chen Ning N Chen Weifeng W Yu Xiaohui X Yan Bingmin B Gou Huiyang H

Materials (Basel, Switzerland) 20220421 9

The precise determination of atomic position of materials is critical for understanding the relationship between structure and properties, especially for compounds with light elements of boron and single or multiple transition metals. In this work, the single crystal X-ray diffraction is employed to analyze the atomic positions of Co2MoB4 and Fe2MoB4 with a Ta3B4-type structure, and it is found that the lengths of B-B bonds connec ...[more]

PMID: 35591366

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Project description:Background: Minimally invasive modalities are of great interest in the field of treating bone tumors. However, providing reliable mechanical support and fast killing of tumor cells to achieve rapid recovery of physical function is still challenging in clinical works. Methods: A material with two functions, mechanical support and magnetic thermal ablation, was developed from Fe3O4 nanoparticles (NPs) distributed in a polymethylmethacrylate (PMMA) bone cement. The mechanical properties and efficiency of magnetic field-induced thermal ablation were systematically and successfully evaluated in vitro and ex vivo. CT images and pathological examination were successfully applied to evaluate therapeutic efficacy with a rabbit bone tumor model. Biosafety evaluation was performed with a rabbit in vivo, and a cytotoxicity test was performed in vitro. Results: An NP content of 6% Fe3O4 (PMMA-6% Fe3O4, mFe: 0.01 g) gave the most suitable performance for in vivo study. At the 56-day follow-up after treatment, bone tumors were ablated without obvious side effects. The pathological examination and new bone formation in CT images clearly illustrate that the bone tumors were completely eliminated. Correspondingly, after treatment, the tendency of bone tumors toward metastasis significantly decreased. Moreover, with well-designed mechanical properties, PMMA-6%Fe3O4 implantation endowed tumor-bearing rabbit legs with excellent bio-mimic bone structure and internal support. Biosafety evaluation did not induce an increase or decrease in the immune response, and major functional parameters were all at normal levels. Conclusion: We have presented a novel, highly efficient and minimally invasive approach for complete bone tumor regression and bone defect repair by magnetic thermal ablation based on PMMA containing Fe3O4 NPs; this approach shows excellent heating ability for rabbit VX2 tibial plateau tumor ablation upon exposure to an alternating magnetic field (AMF) and provides mechanical support for bone repair. The new and powerful dual-function implant is a promising minimally invasive agent for the treatment of bone tumors and has good clinical translation potential.

Dataset Information

Structure Determination, Mechanical Properties, Thermal Stability of Co₂MoB₄ and Fe₂MoB₄.

Publications

Structure Determination, Mechanical Properties, Thermal Stability of Co<sub>2</sub>MoB<sub>4</sub> and Fe<sub>2</sub>MoB<sub>4</sub>.

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