ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2023
·Vol. 48
·期 12
·16471-16482
·
IF 2.9
Zainuddin Muhd Izzudin Fikry,Ahmad Abdul Latif,Subramaniam Reasmyraj R.
Carbon dioxide (CO 2 ) separation with membrane technology has become the focus of researchers over the past decades due to its lower energy consumption and cheaper alternative. Mixed matrix membrane (MMM) of poly(4-methyl-1-pentene) (PMP) with nano fumed silica particles was studied to determine the feasibility of using MMM to separate CO 2 from nitrogen (N 2 ) gas. The critical concentration of PMP (7 wt%) was utilized to form the membrane in this study in order to ensure the polymer chain entanglement occurs to form a dense structure. Agglomeration of particle can be observed on the surface with scanning electron microscopy (SEM) imaging with 10 and 15 wt% of nano fumed silica loading in PMP matrix. This observation is further confirmed with energy-dispersive X-ray (EDX) mapping across the cross-sectional area which shows clustered nano fumed silica particle with loading of 10 and 15 wt%. With 7.5 wt% filler loading and at 1 bar, the MMM seems to give the best gas permeance performance with CO 2 permeance of 4.62 GPU (100.54 Barrer) and N 2 permeance of 0.20 GPU (4.31 Barrer) which makes the highest ideal selectivity to be about 23, which was the highest ideal selectivity achieved in this study. Meanwhile, when the pressure was increased from 1 to 7 bar, the CO 2 permeability increased almost linearly followed by a steady decline in CO 2 /N 2 ideal selectivity.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Zhihua Tian,Bingzhen Yan,Fushuo Wu,Jingwen Tang,Xueqin Xu,Jian Liu,Peigen Zhang,ZhengMing Sun
Herein, high-purity Ti 2 (In x Al 1- x )C ( x = 0–1) solid solutions were successfully synthesized. The crystal structure and actual composition of solid solutions were confirmed using XRD, SEM, and TEM analyses, and their formation mechanism was revealed by thermal analysis. On the In-rich side ( x ≥ 0.5), primary Ti 2 InC first formed and then acted as a crystalline seed for the subsequent solid solutions, resulting in a cluster-like morphology. The lattice constants of Ti 2 (In x Al 1- x )C were found to well follow Vegard’s law. The examined properties of Ti 2 (In x Al 1- x )C also greatly depended on their A-site compositions. Ti 2 AlC exhibited the highest hardness and elastic moduli, while the best corrosion resistance was achieved at Ti 2 InC, and all Ti 2 (In x Al 1- x )C displayed active dissolution in 0.5 M HCl solution. Thus, adjusting the In/Al ratio at A-site can yield a desired set of performances, which provides a good example for regulating the performance of MAX phases via A-site solid solution strategy.
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TRANSITION METAL CHEMISTRY
·
2017
·Vol. 42
·期 4
·273-283
·
IF 1.358
Fang Dong-Lin,Mo Shao-Yin,Wu Kai-Fei,Huang Zhong-Jing
Three coordination polymers have been obtained by hydrothermal synthesis, namely [Zn(imip)(H 2 O) 2 ]·0.5H 2 O ( 1 ), [Co(imip)(H 2 O) 2 ]·0.5H 2 O ( 2 ), and [Cd 2 (imip) 2 (H 2 O) 3 ] ( 3 ) [H 2 imip = 5-(1H-imidazol-1-yl) isophthalic acid]. The coordination polymers were characterized by IR spectra, elemental analysis, powder X-ray diffraction, and thermogravimetric analysis. Furthermore, single-crystal X-ray analysis reveals that they have 2D structures, which are extended into 3D networks via O–H···O hydrogen-bonding interactions. The luminescent properties of these coordination polymers were investigated.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wei Shen,Liang Qiao,Juan Ding,Yongming Sui
Tailoring tantalum disulfide (TaS 2 ) electrocatalysts with tunable stacking architecture and phase structure is of great importance for advancement of hydrogen evolution reaction (HER). In this work, stacking architecture- and phase- modulated tantalum disulfide nanosheets are reported through a facile liquid phase synthesis strategy. Accordion-like nanosheets , vertical nanosheets and ultrathin nanosheets are named according to their obvious stacking architecture, and 1 T-2 H mixed phase structures containing different degrees of 2 H phases are realized. High-resolution transmission electron microscopy shows that there are obvious lattice defects in the nanosheets. Tantalum disulfide nanosheets synergistically integrate multiple advantages of nanostructure engineering, phase engineering and defect engineering. In the HER process, the ultrathin tantalum disulfide nanosheet structure is conducive to the in-plane electron transfer , and its close contact with the electrode surface makes the charge transfer faster and has the best HER activity. The overpotential of the ultrathin nanosheet electrocatalyst at 10 mA cm −2 is 280 mV. After 10,000 CV cycles and over 40 h of i-t test, the catalyst still has high stability in acidic media. Theoretical calculations show that the addition of 2 H phase structure and rich defects improves the intrinsic activity and active sites, and jointly promotes the improvement of HER performance. Our work integrates a variety of optimal regulation methods into TaS 2 nanosheets, providing a new idea for the construction of advanced electrocatalysts for water electrolysis.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaowei Li,Xing Shen,Junmei Zhao,Yang Yang,Qiangqiang Zhang,Feixiang Ding,Miao Han,Chunliu Xu,Chao Yang,Huizhou Liu,Yong-Sheng Hu
Na-ion batteries (NIBs) have been considered as potential candidates for large-scale energy storage, where O3-type Na-based layered oxide cathodes have attracted great attention due to their high capacity and low cost. However, O3-NaxTMO2 materials still suffer from insufficient air stability, which could lead to deteriorative electrochemical properties and thus hinder their practical application. In this work, a series of Al-doped O3-NaFe(1/3–x)Ni1/3Mn1/3AlxO2 cathodes prepared by a co-precipitation method were investigated to enhance their electrochemical performance and air stability through stabilizing their structural and interface chemical properties. The Al-doped O3-NaFe(1/3–0.01)Ni1/3Mn1/3Al0.01O2 (NFNMA0.01) cathode delivers a comparable capacity of 138 mAh g–1 and keeps a capacity retention of 85.88% after 50 cycles at 0.2 C, while the undoped O3-NaFe1/3Ni1/3Mn1/3O2 (NFNM) can only keep a capacity retention of 71.02%, although with an initial capacity of 141 mAh g–1 at 0.2 C. For the air stability, the capacity decay rates are 58.87 and 5.07% for the undoped NFNM and Al-doped NFNMA0.01 after the air exposure for 30 days, respectively. The greatly decaying electrochemical performance could be due to the formation of carbonates during air exposure, which can be efficiently suppressed by Al doping. The doped Al3+ has been confirmed to be inserted into the NFNM crystal lattice, inducing the reduced values of lattice parameters a and c due to the smaller ionic radius of Al3+ (53.5 pm) vs Fe3+ (55.0 pm). This study demonstrates that Al doping plays an important role in the air stability and cycling stability for layered cathode materials, which offers an efficient strategy to optimize the material design for their practical application in NIBs.
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Advanced Energy Materials
·
2026
·
IF 25.5
Wenqi Zhao,Hai Lin,Wenhao Sun,Chengming Li,Yuepeng Guan,Weikun Wang,Yaqin Huang
Despite the high theoretical energy density (2600 Wh kg −1 ) of lithium–sulfur (Li–S) batteries, their practical application in low-altitude unmanned aerial vehicles is severely hindered by sluggish reaction kinetics and the severe shuttle effect of lithium polysulfides, making it difficult to meet the stringent demands for high-rate capability and high energy density. Single-atom catalysts (SACs) have emerged as a promising strategy to accelerate polysulfide conversion kinetics. However, conventional SACs often face challenges such as high preparation costs, complex synthetic processes, and catalyst poisoning due to excessively strong binding with sulfur species. To address these technical and economic limitations, this work focuses on developing cost-effective and efficient materials for large-scale energy storage. Graphitic carbon nitride (g-C 3 N 4 ), a low-cost, easily scalable material with abundant nitrogen coordination sites, was selected as the substrate to prepare an atomically dispersed SAC (Mn-CN). Benefiting from the unique half-filled 3d electronic configuration of the Mn atom, the catalyst directly establishes a robust “Mn–S and Li–N” dual-coordination mechanism. This specific interaction effectively activates the Li─S bond and substantially lowers the thermodynamic energy barriers, thereby improving the redox kinetics of polysulfide conversion. Consequently, the assembled Li–S batteries maintain a reversible capacity of 658 mAh g −1 at a high rate of 4 C and exhibit stable long cycling performance. Furthermore, the assembled 14 Ah-level pouch cell achieves an initial energy density of 547 Wh kg −1 and over 30 stable cycles. This work provides a practical approach for preparing cost-effective and efficient single-atom catalysts, supporting the industrial application of high-energy-density Li–S batteries.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 1.9
Yu-cheng Jiang,Bao-guang Zhu,Xiang-li Long
The oxidation of 1-(4-chlorophenyl)-pyrazolidin-3-one to 1-(4-chlorophenyl)-1H- pyrazol-3-ol by air can be accelerated by the Co(II)@AC catalyst prepared by loading Co(II) on activated carbon with wet impregnation method. ZnCl 2 solution has been used to treat activated carbon to ameliorate the catalytic ability of Co(II)@AC catalyst. The experiments indicate that the optimal catalyst is made by immersing activated carbon in 0.7 mol/L ZnCl 2 solution at 50°C for 6 h with a liquid/solid ratio of 30/1 (mL/g) followed being calcined at 700°C for 5 h at a heating rate of 5°C/min under N 2 protection. The 1-(4-chlorophenyl)-1H-pyrazol-3-ol concentration catalyzed by the catalyst loaded on the best carbon reaches 0.01953 kg/L, which is 27.56% higher than that catalyzed by the catalyst loaded on the original carbon. The characterization results manifest that the modification with ZnCl 2 enriches the porous structure and increases the acidic groups on the surface of activated carbon. The conversion of 1-(4-chlorophenyl)-pyrazolidin-3-one is mainly determined by the physical structure of the activated carbon while the selectivity to 1-(4-chlorophenyl)-1H- pyrazol-3-ol is largely affected by the chemical characteristics of the activated carbon.
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产品关联
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Advanced Photonics Nexus
·
2026
·
IF 6.3
Jiale Chen,Yuxiao Xiong,Ye Lu,Weisheng Zhang,Kunjue Shang,Zhenzhen Li,Mingsi Lai,Haolin Chen,Zhouyi Guo,Bo Xu,Zhiming Liu
Tumor-associated macrophages, the largest population of immune cells in the tumor microenvironment (TME), dominate the complexity of TME due to their highly phenotypic plasticity, leading to personalized tumor progression, differentiated drug response, and tolerance. However, current methods for the interpretation of cellular heterogeneity involve destructive, cumbersome, and high-cost sample pretreatment procedures. Herein, we present surface-enhanced Raman scattering cytomics (SERS-Cytomics) as a non-destructive and low-cost approach for macrophage phenotyping and metabolic profiling. SERS-Cytomics is capable of providing the whole molecular fingerprints of living cells at a single-cell level. A deep-learning model enables accurate classification of three phenotypes of macrophages exceeding 95%. Further, the Shapley additive explanations analysis is adopted to screen the differential metabolic signals, where two metabolic biomarkers at 1071 (glucose) and 1440 (cholesterol) cm−1 display the maximum weight in the classification of M1 and M2 macrophages, respectively. Correlation explanation of SERS-Cytomics and transcriptomics reveals the involvement of the glycolytic pathway and lipid metabolism in M1 and M2 macrophages, respectively. Therefore, SERS-Cytomics enables an efficient and non-destructive analytical tool for cellular heterogeneity explanation at a single living cell level.
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OPTICAL ENGINEERING
·
2023
·
IF 1.3
Guolong Li,Yulin Zuo,Weidi Shi,Liwen Hu,Longsheng Hu,Kun Zhu
The quasi-two-dimensional (quasi-2D) perovskite possesses good film coverage and high photoluminescence quantum efficiency, and exhibits a characteristic of high-level radiation recombination. However, the charge transferring from quasi-2D perovskites is not comparable to that of three-dimensional perovskites due to the insulating nature of large organic cations, thus limits the brightness of quasi-2D perovskite light-emitting diodes (PLEDs). In this work, phenylethylammonium bromide (PEABr) and formamidine hydrobromide (FABr) were strategically introduced as two spacer cations to form quasi-2D perovskite phase, thus weakened the van der Waals gap between individual perovskite layers. The enhanced coupling strength between each layer promoted the energy transfer efficiency and led to an increasing radiative recombination rate of the perovskite films. Meanwhile, an optimized molar ratio of PEABr: FABr: PbBr2 improved perovskite film morphology and passivated its defects, which reduced the nonradiative recombination loss of quasi-2D PLEDs. As a result, a maximum brightness of 32,368 cd m − 2 can be obtained for this kind of devices.
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OPTICAL ENGINEERING
·
2022
·
IF 1.352
Guolong Li,Mengyao Li,Yulin Zuo,Xinlei Suo,Hang Su,Yunzheng Wang,Longsheng Hu,Weidi Shi,Liwen Hu
Serious nonradiative recombination and decomposition of perovskite film exist in MAPbBr3-based perovskite light-emitting diodes (PeLED) due to the residue of lead atoms from an incomplete reaction, thereby limiting the efficiency of PeLEDs. Excessive Methylammonium bromide (MABr) added into the precursor of methylammonium lead bromide (MAPbBr3) can solve this problem. However, how the excessive MABr self-passivates perovskite films improves the performance of PeLEDs requires further examination. The self-passivated perovskite film by overdoping MABr was investigated by varying stoichiometric ratios of perovskite precursors. It was found that, as the content of MABr increased, the interaction between free charge and longitudinal optical phonons was enhanced, thus reducing the exciton binding energy, resulting in emission broadening and blue shift of the PL spectra. With the molar ratio of PbBr2 and MABr of 1:1.315, the PeLED achieved a good trade-off between the brightness and the stability, thus demonstrating a maximum brightness of 9981 cd m − 2 and a lifetime of 14 min, with a maximum current efficiency of 6.59 cd A − 1.
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OPTICAL ENGINEERING
·
2013
·
IF 0.88
Xiaoyi Lv,Furu Zhong,Zhenhong Jia,Liangliang Chen,Ji Ma,Hongyan Zhang,Zhuangqi Cao,Jun Zhou
We fabricated a one-dimensional nanoporous silicon photonic crystal on a silicon insulator substrate by a cost-effective electrochemical method as an optical biosensor for the detection of DNA hybridization. In the first step, a transfer matrix method was used to calculate the corresponding reflectivity spectrum for the design of nanoporous silicon photonic crystals. Then silicon-on-insulator-based photonic crystals were prepared by a novel simple electrochemical etching. Genes were hybridized inside the porous silicon (PS) pores by aminopropyltriethoxysilane and glutaraldehyde and detected through frequency resolved reflectance measurements. A detection sensitivity of 17.445 nm/μM is demonstrated with good specific detection. The linear response range covers a concentration range of antifreeze protein gene from 0.625 to 10.000 μM. This high responsivity indicates that the silicon-on-insulator-based PS photonic crystal has significant potential for application in biological micro-electro-mechanical-systems technologies.
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Journal of Photonics for Energy
·
2021
·
IF 1.836
Kai Gao,Youwen Liu,Honglie Shen
Radiative cooling as a spontaneous cooling phenomenon without any energy input has great research value and broad application prospects. However, environmental shields around the thermal emitter have a negative impact on the radiative cooling power of thermal emitters. A PTFE-Al was used as the radiative cooling thermal emitter, and the radiative cooling performances with different unilateral shielding angle were measured. The temperature difference of 7.4°C was achieved in an open and unobstructed environment, while the temperature difference of 2.8°C at the unilateral shielding angle of 90 deg. Furthermore, using the energy conservation model, we theoretically calculated the radiative cooling powers and the temperature differences of the thermal emitter under different shielding conditions, which were in good agreement with the experimental results.
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