Beijing Institute of Petrochemical Technology (BIPT; simplified Chinese: 北京石油化工学院; traditional Chinese: 北京石油化工學院; pinyin: Beijing Shiyou Huagong Xueyuan), founded in 1978, had been a specialist school connected to the petrochemical system. After a development initiative over decades, it became a multi-disciplinary university with eleven colleges and departments.
The development of efficient dual-atom electrocatalysts to enhance the performance of the carbon dioxide reduction reaction (CO2RR) is of great significance. Herein, we report the successful synthesis of an Fe-Mo-NC dual-atom catalyst using a ZIF-8 templating strategy for the electrochemical conversion of CO2 to CO. The catalyst exhibited excellent CO2RR activity and selectivity over a wide potential range, with an onset over-potential as low as 360 mV. A Faradaic efficiency of 97.1% toward CO was obtained at-0.68 V (vs. RHE). Moreover, it maintained a FECO above 85% even under high current density conditions (200 mA & sdot;cm-2) in membrane electrode assembly testing, demonstrating strong potential for industrial application. Theoretical calculations based on density functional theory show that the Fe-Mo dual-atom ensemble promotes an upward displacement of the d-band center due to interatomic electronic coupling, consequently tailoring the adsorption behavior of reaction intermediates. Such an effect not only decreases the energy barrier of the rate-determining step but also mitigates hydrogen evolution, synergistically improving the catalyst's intrinsic performance in CO2RR.
In this study, bovine serum albumin-stabilized gold nanoclusters (BSA@AuNCs) were synthesized using a microfluidic droplet system. Compared with traditional flask-based synthesis methods, the microfluidic droplet system yielded AuNCs with uniform nucleation, enhanced fluorescence properties, improved stability, and a significantly shortened preparation time (24 min). Selectivity analysis demonstrated that BSA@AuNCs exhibit high specificity toward Cu(II), and a linear relationship was observed between the Cu(II) concentration (0–5000.0 µM) and the fluorescence intensity of BSA@AuNCs, with a detection limit of 20.0 µM. Upon the addition of Cu(II), the binding of Cu(II) to BSA@AuNCs led to increased particle size and aggregation, which was macroscopically manifested as fluorescence quenching. Finally, BSA@AuNCs were innovatively applied to the detection of Cu(II) levels in zebrafish embryos. Confocal laser scanning microscopy (CLSM) imaging revealed a gradual decrease in fluorescence intensity within BSA@AuNC-incubated zebrafish embryos as the Cu(II) concentration increased. This method provides a viable strategy for detecting metal ions in living organisms and lays an experimental foundation for investigating the effects of Cu(II) and their related mechanisms in vivo.
2,2,4,4-Tetramethyl-1,3-cyclobutanediol (CBDO) is a very important polyester monomer widely used in the synthesis of polyester resins for powder coatings, polyester polyols for polyurethane adhesives, and copolyesters with excellent weather resistance and hydrolytic stability. In this study, Ru–Sn/Al2O3 bimetallic catalysts were fabricated by incorporating Sn additives. Characterization with XRD, TEM, and BET analysis revealed that Sn is uniformly distributed on the Al2O3 support in the form of SnO2 and exhibits strong interaction with Ru species (average particle size 1.26 nm). This synergistic effect optimizes the pore structure of the catalyst, increasing its specific surface area to 243.76 m2/g, and promotes the activation of the C=O bond via electron transfer. Catalytic performance results show that the Ru–Sn/Al2O3 catalyst achieves a TMCB conversion of 99.96
Based on the nucleophilic addition reaction between cinnamaldehyde and bisulfite, this study develops an analytical method for determining the cinnamaldehyde content in cinnamon essential oil using iodometric back-titration. Cinnamaldehyde reacts quantitatively with excess bisulfite, and the unreacted bisulfite is titrated with iodine. The method demonstrated a strong linear relationship (R2 = 0.9999) within the concentration range of 2–15 mg/mL, with a detection limit of 0.32 mg/mL and a quantification limit of 1.07 mg/mL. Recovery tests using Chinese and Ceylon cinnamon essential oils showed recovery rates between 96.0 and 99.4
Directed energy deposition (DED) of titanium alloys is frequently accompanied by strong thermal gradients, resulting in coarse columnar prior beta grains and pronounced mechanical anisotropy. Achieving a columnar-toequiaxed transition (CET) in near-beta titanium alloys therefore remains a critical solidification-related challenge. This study systematically investigates the solidification behavior and microstructural evolution of a near-beta titanium alloy (Ti-5Al-2Sn-2Zr-4Mo-4Cr, TC17) fabricated via a six-laser coaxial wire-fed directed energy deposition (WLDED) process. Owing to the spatially distributed multi-laser energy input, the melt pool thermal field and fluid flow behavior are significantly modified, leading to enhanced convection and altered local solidification conditions. As a result, a pronounced CET is achieved directly in the as-deposited condition without compositional modification or external field assistance, producing nearly equiaxed prior beta grains with an average size of approximately 126 mu m. Furthermore, the high solidification rate inherent to the WLDED process promotes the formation of a hierarchical nanoscale alpha+beta lamellar microstructure. The combined effects of equiaxed prior beta grains and refined lamellar architecture result in a high ultimate tensile strength of approximately 1.3 GPa and low in-plane mechanical anisotropy (%IPA<0.4%). These results demonstrate that process-induced thermalfluid-solidification coupling plays a decisive role in driving CET in near-beta titanium alloys under non-equilibrium DED conditions.
