Da-Hua Wei

Iron-platinum nanoparticles encapsulated in metal–organic frameworks and coated with red blood cell membranes enhance MRI stability and tumor targeting, enabling improved visualization and real-time diagnosis of hepatocellular carcinoma.

Metal-supported cerium dioxide catalysts are widely used in industrial processes. This study investigates copper-cerium dioxide (Cu-CeO₂) as a promising catalyst for CO oxidation, noted for its cost-effectiveness and low activation temperature. However, the reaction mechanism remains unclear. We examine the effects of copper ion doping into CeO₂ nanoparticles at 0, 5, 15 at%, synthesized via precipitation. X-ray diffraction (XRD) analysis confirmed sample purity, revealing partial amorphization at a higher doping level. Lower Cu concentration in CeO₂ facilitated CO oxidation at a lower temperature. X-ray absorption spectroscopy (XAS) investigated the electronic and atomic structures, showing that CeO₂ with a lower Cu doping resulted in a higher lattice oxygen content and moderate Cu ion reduction. Increased Cu doping decreased Ce-O coordination numbers, while Cu-O radial distance was larger at lower doping. In situ XAS identified moderate reduction of Ce and Cu, elucidating CO oxidation via the Langmuir-Hinshelwood (LH) mechanism at lower Cu concentration. The superior low-temperature CO oxidation performance is attributed to moderate Ce and Cu ion reduction coupled with increased oxygen adsorption on the catalyst surface. These findings provide insights into the relationship between the dopant concentration, electronic structure, and catalytic activity for optimizing ceria-based catalysts for efficient CO oxidation.

In this study, in situ techniques were utilized to elucidate the hydration and heating reaction mechanisms of the Li₃InCl₆ solid-state electrolyte, offering valuable insights into an effective reaction pathway.

This work introduces a hybrid semi-solid electrolyte of PEO polymer and liquid catholyte, enhancing Mg–O₂ battery performance by improving cathode-electrolyte interaction, anode protection, discharge capacity, and cycling efficiency.

Na-O₂ batteries have emerged as promising candidates due to their high theoretical energy density (1,601 Wh kg^-1), the potential for high energy storage efficiency, and the abundance of sodium in the earth's crust. Considering the safety issue, quasi-solid-state composite polymer electrolytes are among the promising solid-state electrolyte candidates. Their higher mechanical toughness provides superior resistance to dendritic penetration compared with traditional liquid electrolytes. The flexibility of the composite polymer electrolyte matrix allows it to conform to various battery configurations and considerably reduces safety concerns related to the combustion risks associated with conventional liquid electrolytes. In this study, we employed poly(ethylene oxide) (PEO) and sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) as the polymer matrix and sodium ion-conducting agent, respectively. We incorporated nanosized NZSP (25 wt %) to create the composite polymer electrolyte membrane. This CPE design facilitates ion conduction pathways through both sodium salt and NZSP. By utilizing a liquid electrolyte infiltration method, we successfully enhanced its ionic conductivity, achieving an ionic conductivity of 10^-4 S cm^-1 at room temperature.

Halloysite nanotubes (HNTs) have a layered structure of clay silicate minerals and a tubular shape, which is suitable for the uniform loading of small substrates and drug molecules. The inner diameter of HNTs with an acidic solvent is selectively etched to increase the loading capacity of magnetic iron–platinum (FePt) nanoparticles. The FePt nanoparticles and etched HNTs (eHNT) are then composited by vacuum decompression. The resulting product is named FePt@eHNT and is used as a contrast agent for T2‐weighted magnetic resonance imaging. According to a comprehensive analysis of the material and its magnetic properties, by adding different proportions of HNTs before and after modification, the saturation magnetization can reach 23.769 emu g⁻¹, which is higher than that of the composite materials studied in previous studies. This is because the tubular structure promotes the orderly displacement of the FePt nanoparticles under three‐dimensional space constraints and the uniform effect of the magnetic field. In addition, the magnetothermal effect of the composite material is observed and its potential as an imaging agent is investigated. In this study, the enhancement of its ferromagnetism and its potential to become a multifunctional composite material for applications in drug delivery, magnetic hyperthermia, and bioimaging is demonstrated.

In modern technology devices, an energy‐saving miniature near‐infrared (NIR) light source plays a critical role in non‐destructive, non‐invasive sensing applications and further advancement of technology. This paper reports the broadband NIR luminescence of Cr³⁺ clusters for designing phosphor‐converted NIR light‐emitting diodes as an alternative to typical isolated Cr³⁺ centers and Cr³⁺ ion pairs. Here, Cr³⁺ clusters form in the intermediate spinel structure of MgGa₂O₄ by utilizing the long‐chain edge‐shared octahedral dimers with the shortest bond distance between Cr³⁺ cations. Electron paramagnetic and magnetometry measurements confirm the isolated Cr³⁺ and Cr³⁺ clusters, resulting in NIR luminescence with three distinct emission centers. The formation of Cr³⁺ clusters in MgGa₂O₄ ensures stable internal quantum efficiency (≈94%), full‐width‐half‐maximum (248 nm), thermal stability (87%), and a radiant flux of ≈17.66 mW. This work offers a promising approach to NIR phosphor design and enhances the understanding of luminescence mechanisms in spinel and related structures.