Current Issue : July-September Volume : 2025 Issue Number : 3 Articles : 5 Articles
Gas adsorption in nanoscale pores is one of the key theoretical bases for shale gas development. However, the influence mechanisms of gas adsorption capacity and the second adsorption layer in nanoscale pores are very complex, and are difficult to directly observe by using traditional experimental methods. Therefore, multilayer graphene is used to model the nanopores in a shale reservoir, and the molecular dynamics method is carried out to study the adsorption dynamics of methane molecules. The results show that the adsorption density of methane molecules is inversely proportional to the temperature and pore size, and it positively correlates to the graphene layer number and pressure. The smaller adsorption region will reach the adsorption equilibrium state earlier, and the adsorption layer thickness is smaller. When the pore size is larger than 1.7 nm, the single-layer adsorption becomes double-layer adsorption of methane molecules. The peak of the second adsorption layer depends on the pressure and temperature, while the position of the second adsorption layer depends on the pore size. The present work is useful for understanding the dynamics mechanism of gas molecules in a nanoscale confined space, and may provide a theoretical basis for the development of unconventional natural gas....
Carbonaceous-based metal-free catalysts are promising aspirants for effective electrocatalytic hydrogen generation. Herein, we synthesized mesoporous-activated carbon nanosheets (ELC) from biomass eucalyptus leaves through KOH activation. The microstructure, structural, and textural characteristics of the prepared materials were characterized by FE-SEM, Raman, XRD, and BET measurements. The high temperature (700 ◦C) KOH-activated ELC nanosheets exhibited an interconnected nanosheet morphology with a large specific surface area (1436 m2/g) and high mesoporosity. The ELC-700 catalyst exhibited an excellent electrocatalytic HER performance with a low overpotential (39 mV at 10 mA/cm2), excellent durability, and a Trivial Tafel slope (36 mV/dec) in 0.5MH2SO4 electrolyte. These findings indicate a new approach for developing excellent biomass-derived electrocatalysts for substantially efficient green hydrogen production....
The transition metal dichalcogenide (TMDC) NbSe2 is a highly conductive and superconducting material with great potential for next-generation electronic and optoelectronic devices. However, its bulk form suffers from reduced charge density and conductivity due to interlayer van der Waals interactions. To address this, we exfoliated NbSe2 into nanosheets using lithium-ion intercalation and utilized them as diaphragms in acoustic transducers. Conventional electromagnetic and electrostatic mechanisms have limitations in sound pressure level (SPL) performance at high and low frequencies, respectively. To overcome this, we developed a hybrid force mechanism combining the strengths of both approaches. The NbSe2 nanosheets were successfully prepared and analyzed, and the NbSe2-based hybrid acoustic transducer (N-HAT) demonstrated significantly improved SPL performance across a wide frequency range. This study offers a novel approach for designing high-performance acoustic devices by harnessing the unique properties of NbSe2....
Bio-based polyurethane (BPU) offers excellent biocompatibility and outstanding elasticity, providing vast potential for the development of next-generation waterproof and breathable materials. However, achieving stable and uniform electrospinning of BPU remains a significant challenge. Herein, BPU with superior electrospinning performance was synthesized using poly(butylene sebacate), poly(trimethylene ether glycol), ethylene glycol, and methylene diphenyl diisocyanate (MDI) as raw materials. BPU nanofibrous membranes were successfully fabricated using solutions of varying concentrations (12 wt%, 16 wt%, 20 wt%, and 24 wt%), and their morphology, mechanical properties, hydrophobicity, and breathability were systematically analyzed. The nanofibrous membrane prepared with 20 wt% BPU solution exhibited optimal fiber morphology and mechanical properties, with a tensile strength of 15.6 MPa and an elongation at break of 440.8%. In contrast, lower concentrations (12 wt% and 16 wt%) resulted in insufficient fiber formation, leading to poorer performance, while higher concentrations (24 wt%) significantly reduced fiber uniformity, negatively impacting the overall performance. Additionally, the nanofibrous membrane produced from the 20 wt% BPU solution demonstrated significant hydrophobicity and breathability, with a water contact angle of 133.2◦, hydrostatic pressure of 48.2 kPa, and breathability of 12.6 kg·m2·d−1. These findings suggest that BPU nanofibrous membranes produced via electrospinning hold great potential for application in functional textiles....
Electrochemical glucose sensors are vital for clinical diagnostics and the food industry, where accurate detection is essential. However, the limitations of glucose oxidase (GOx)-based sensors, such as complex preparation, high cost, and environmental sensitivity, highlight the need for non-enzymatic sensors that directly oxidize glucose at the electrode surface. In this study, a self-supporting hierarchical Cu/Fe3O4 nanosheet electrode was successfully fabricated by in situ growth on Ni Foam using a hydrothermal method, followed by annealing treatment. The Cu/Fe3O4 hierarchical nanosheet structure, with its large surface area, provides abundant active sites for electrocatalysis, while the strong interactions between Cu/Fe3O4 and Ni Foam enhance electron transfer eciency. This novel electrode structure demonstrates exceptional electrochemical performance for non-enzymatic glucose sensing, with an ultrahigh sensitivity of 12.85 μA·μM1·cm2, a low detection limit of 0.71 μM, and a linear range extending up to 1 mM. Moreover, the Cu/Fe3O4/NF electrode exhibits excellent stability, a rapid response (~3 s), and good selectivity against interfering substances such as uric acid, ascorbic acid, H2O2, urea, and KCl. It also shows strong reliability in analyzing human serum samples. Therefore, Cu/Fe3O4/NF holds great promise as a non-enzymatic glucose sensor, and this work oers a valuable strategy for the design of advanced electrochemical electrodes....
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