Materials Science and Engineering: B最新文献

A novel bilayer porous resin with micropore filling and anion exchange (PsCH₂BP) was synthesized. The aim was to investigate the adsorption of sulfadiazine on PsCH₂BP. The micropore area of PsCH₂BP was reduced by 73.91 % after the adsorption of sulfadiazine. PsCH₂BP exhibited the synergism of micropore filling and anion exchange in the adsorption of sulfadiazine. Within the pH range of 7.29–13.31, the adsorption capacity trend of sulfadiazine on PsCH₂BP was consistent with its ionization curve of pka 6.48. The adsorption of sulfadiazine on PsCH₂BP was endothermic, spontaneous, entropy increase and heterogeneous multilayer adsorption, reflecting the bilayer pore structure of PsCH₂BP. 100 % C₂H₅OH and 4 % NaCl could desorb 75.13 % and 65.06 % of sulfadiazine adsorbed on PsCH₂BP, respectively, reflecting the synergism of the micropore filling and anion exchange in the adsorption of sulfadiazine on PsCH₂BP. 100 % of desorption ratio of sulfadiazine adsorbed by PsCH₂BP was achieved with 4 mol/LNaOH.

This study investigates the photovoltaic (PV) properties, their energetic offset correlations of quinazoline-based push-pull switches. It finds an interesting correlation between their band-gaps and the rotational velocities with a linear fit value of 0.78. Also, their larger positive offsets up to 10¹¹ by their open circuit voltage (V_oc) tend to facilitated their efficient electron injection, leading to an improved photocurrent generation for device performance. Through push-pull phenomenon, a highest λ_max of 574 nm was attained for the dye T5. Their PV performance of the was calculated as V_oc, short circuit current (J_sc), and light harvesting efficiency (LHE) as 0.05–0.81 eV, 28.52–40.10 mA/cm² and 0.65–0.87 respectively. Their transition density matrix (TDM) maps showed an enhancement of electron injection with the use of a more intense electron acceptor. This study advances understanding of the PV properties of quinazoline-based switches for developing PV devices. Their further research can lead to high-performance PV systems.

In this study, a comprehensive investigation on the performance of laminated electrodes for hydrogen evolution reaction (HER) is conducted using experiments and numerical simulation. A laminated composite electrode with superior catalytic activity is designed, synthesized and tested, which is comparably researched with traditional homogeneous electrodes. A Ti/Cu laminated electrode with a slot width of 250 µm is fabricated by explosive welding and an electrochemical corrosion process is applied to create groove-shaped interface. The results show that the grooved laminated electrode has superior hydrogen precipitation performance and conductivity, exceptional stability, and minimal potential fluctuation. Hydrogen production efficiency of laminated electrode is 120% higher than that of Cu electrode, which is verified in our self-made hydrogen-making device. COMSOL simulation results were found to be consistent with the experimental findings. Overall, this study provides valuable insight into enhancing electrode performance, with broad engineering implications.

Organic phototransistors are leading the development of next-generation wearable, monitoring, imaging, and sensing technologies due to their light weight, low cost, high yield, compatibility with flexible substrates, and customizable methods for synthesizing optoelectronic properties. However, the long channel length of conventional planar structures, usually in the micron range, greatly reduces the carrier transport efficiency and leads to an increased probability of defect trapping and complex recombination of photogenerated carriers. Here, an organic phototransistor with a vertical channel structure has been demonstrated, in which the active layer is blended with Mxene. Due to the short channel length of vertical structure, the recombination possibility of photogenerated excitons is reduced, and the high ultraviolet sensitivity of Mxene increases the bandwidth of detection. The device exhibits excellent photodetection performance with the photosensitivity of 4.28 × 10⁶, photoresponsivity of 2.39 × 10⁴ A/W, detectivity of 1.04 × 10¹⁷ Jones under irradiation with weak light of 8 μW cm⁻² at 365 nm. This work paves the way for the study of transistors scale and high-performance organic photodetection in the future.

Electromagnetic-wave-absorbing fibers have been proposed as a method for addressing electromagnetic wave pollution. In this study, Fe/Fe₃O₄/C hollow electromagnetic wave absorbers were prepared using hollow ceiba fibers as templates. The ceiba fibers were immersed in an Fe(NO₃)₃ solution and sintered in argon to obtain Fe/C or Fe₃O₄/C hollow fibers with biochar. The wave absorption performance of the proposed Fe/Fe₃O₄/C hollow fibers was generally better than that of standard solid fibers. A minimum reflection loss of − 40.1 dB and an optimal effective bandwidth of 3.26 GHz were obtained. The proposed hollow structure could make the incident electromagnetic waves reflect and scatter many times, which led to significant electromagnetic wave energy consumption. Moreover, the impedance matching of magnetic materials, such as iron and its oxides, could be adjusted using the biochar of ceiba so that magnetic and dielectric losses work together to absorb electromagnetic waves.

We have investigated the rare-earth ferrites perovskite RFeO₃ (R = Pr, Nd) for their structural, electronic, magnetic, optical, thermodynamic, and thermoelectric behavior using DFT as incorporated in WIEN2K software package. We have used FPLAPW method with exchange–correlation potentials: GGA, mBJ, and mBJ + U for investigating the current problem. For electronic properties, we have studied the band profile, density of states, and electronic density of RFeO₃. The band profile of RFeO₃ comes out to be half-metallic in mBJ + U. Further, optical properties have been computed corresponding to photon energy (0–10 eV). Thermodynamic examination of these compounds is performed using the Quasi-Harmonic Debye model. Consequently, the thermodynamic parameters' variation has been examined with temperature (0–1200 K) as well as pressure (0–40 GPa). Finally, we have evaluated the thermoelectric parameters using BoltzTrap code, and their variation with temperature (50–1200 K) and chemical potential (−2 to 2 eV) has been presented. We have obtained a maximum thermoelectric efficiency of 0.38 for PrFeO₃ perovskite, and it is found that it increases with temperature. These materials are suitable to be used as a source in spintronic devices and UV absorbers.

The substantial challenge that the world is facing nowadays, is the increase in greenhouse gasses which causes global warming. Therefore, there must be a technique to overcome its global emission rate. Accordingly, many absorbents and adsorption techniques are used to capture the CO₂ gas. Here, this study reports a novel class of adsorbents Metal Organic Framework (MOF) and its g-C₃N₄ based composites are used to adsorb CO₂. The synthesis of Ni-BDC MOF and its 1–8 wt% g-C₃N₄/Ni-BDC MOF composites were successfully prepared via the solvothermal method. These samples are characterized by using different techniques like XRD, EDX, SEM, FTIR to investigate the structural and morphological properties. The MOFs and their composites were studied for CO₂ adsorption and desorption at a temperature of 25 °C and 0–15 bar pressure. Among all the composites, 5 wt% g-C₃N₄/Ni-BDC MOF shows the highest adsorption capacity of 0.50 mmol/g. The rising adsorption trend of all prepared materials shows that these samples do not reach their saturation point and can still adsorb more CO₂ even at pressure higher than 15 bar.