Coralloid Fe3O4 nanoclusters stacked by nanosheets are successfully synthesized using ferric nitrate as a precursor with an ionic liquid-assisted solvothermal method. For comparison, spherical Fe3O4 nanoclusters assembled by nanospheres are synthesized in the absence of ILs. The morphologies and structures of the products are further characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray power diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results indicate that the ionic liquid 1-n-decyl-3-methylimidazolium chloride ([Dmim]Cl) plays an important role in controlling the growth orientation of building blocks via selectively adsorbing on a specific crystal plane. A formation mechanism has been proposed based on the interaction between ILs and Fe3O4 crystal planes. The catalytic activity of nanoclusters has been evaluated with the Fenton reaction under UVA irradiation. The coralloid nanoclusters show the highest catalytic activity for the degradation of phenol due to their special morphology and unique surface properties. The synthesis strategy may provide a new way to construct nanomaterials with novel morphologies and excellent properties.
In this study, a hierarchical reinforcement with multiple structures is innovated to improve the mechanical properties of short carbon fiber-filled epoxy resin composites (SCFs-EP) through the carbon fiber surface modification by Fe3O4 nanocluster-anchored unzipped carbon nanotubes (CNTs). The results demonstrate that the Fe3O4–unzipped CNTs (Fe3O4–UCNTs)-assisted SCFs-EP exhibit enhanced mechanical properties, tensile strength, and flexural strength up to 200 and 267 MPa, respectively, which are 300 and 231% higher than that of the pure epoxy matrix. The dominant fracture mechanism of the optimized SCFs-EP changes from adhesive failure to cohesive failure after the incorporation of Fe3O4–UCNTs composites. The enhancement effect is mainly attributed to the Fe3O4-terminated nanostructures of finely rebuilt CNTs, which offer sufficient chemical bonding and admirable pinning effect at the interface. Additionally, a large amount of Fe3O4–UCNTs hybrids endow the interface with a favorable modulus transition, decreasing the stress concentration. This research provides a promising strategy to realize substantial reinforcement of short carbon fiber-based composites by optimizing interfacial interactions.
Yiqun Zhang,Ni Zhang,Jianghao Xing,Yiwei Sun,Xu Jin,Cailiang Shen,Liang Cheng,Yuanyin Wang,Xianwen Wang
Chemodynamic therapy (CDT) involving the use of metal nanozymes presents new opportunities for the treatment of deep-seated tumors. However, the lower ROS catalytic rate and dependence on high H 2 O 2 concentrations affect therapeutic efficacy. To address this issue, a hydrogel was constructed for the treatment of osteosarcoma by combining Cu–Fe 3 O 4 nanozymes (NCs) and artemisinin (AS) coencapsulated in situ with sodium alginate (ALG) and calcium ions. This hydrogel can release nanoparticles and AS within tumor tissue for an extended period of time, utilizing the multienzyme activity of NCs to achieve ROS accumulation. The carbon radicals (•C) generated from the interaction of Fe 2+ /Cu 2+ with AS amplify oxidative stress, leading to tumor cell damage. Simultaneously, the NCs activate ferroptosis via the GPX4 pathway by depleting GSH and activate cuproptosis via the DLAT pathway by causing intracellular copper overload, enhancing therapeutic efficacy. In vitro experiments confirmed that the NCs-AS-ALG hydrogel has an excellent tumor cell killing effect, while in vivo experimental results demonstrated that it can effectively eliminate tumors with excellent biocompatibility , providing a new approach for osteosarcoma treatment.
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