JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Yuxuan Shao,Junjie Ni,Jie Yin,Xinqing Liu,Yulai Song,Yue Xu,Shuai Guo,Laima Luo
The construction of heterojunctions between non-noble-metal based compounds affords a scheme for accelerating the reaction kinetics of oxygen evolution reaction (OER) without using precious mental materials, which is extremely important but remains challenging. Herein, the heterogeneous structure between Fe 60 Co 10 Ni 10 Cr 10 Mn 10 medium-entropy alloy (MEA) and FeS 2 is developed by a mechanical alloying approach. The resulting MEA-30 wt%FeS 2 delivers a high OER activity with a low overpotential of 261.6 mV at 10 mA/cm 2 , along with Tafel slope of 52.7 mV/dec in 1.0 mol/L KOH solution, superior to the commercial RuO 2 . The combination of detailed characterization techniques and density functional theory (DFT) calculation reveals that the heterojunctions between Fe-based MEA and FeS 2 generates the synergistic effect on the activation and formation steps of OOH*, thus promoting the OER reaction kinetics. Furthermore, the abundant active sites provided by the reconstructions of MEA-30 wt%FeS 2 during OER process also contributes to the catalytic performance. This work greatly expands the application scope of medium-entropy materials and provides a new method for the fabrication of novel heterogeneous electrocatalyst of Fe-based MEA and FeS 2 .
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Materials Today Physics
·
2024
·
IF 10
Yuping Duan,Meiqi Li,Yuan Guo,Ning Zhu,Huifang Pang,Chenxu Dou
High-entropy alloys, as a novel type of absorber, exhibit exceptional electromagnetic modulation capabilities and significant potential for electromagnetic wave absorption. In this work, the FeCoNiCrMn high-entropy alloy absorbent prepared through a mechanical alloying process demonstrates a dual-phase solid solution structure comprising face-centered cubic (FCC) and body-centered cubic (BCC) phases. By varying the manganese (Mn) content in the system, it is possible to enhance the degree of crystallinity, maintain the integrity of the crystal structure, and effectively control the relative proportion of the BCC phase within the overall phase composition. This adjustment improves the brittleness of the sheet-like particles, reduces particle size, and significantly lowers the permittivity. When the molar ratio of Mn is 0.6, the sample exhibits improved impedance matching due to the optimal permittivity and permeability. Notably, the impedance matching and attenuation constant can also be balanced. At 6.42 GHz, the FeCoNiCr 0.4 Mn 0.6 alloy powder achieves the maximum reflection loss of −48.49 dB at a matching layer thickness of 3 mm. When the matching thickness is reduced to 2 mm, it can effectively cover a frequency range of 8.7–14.1 GHz (effective absorption bandwidth of 5.4 GHz), along with a wide absorption bandwidth and high absorption efficiency.
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JOURNAL OF THERMAL SPRAY TECHNOLOGY
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2025
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IF 3.3
Zhang Jian,Chen Hongxuan,Pang Xiaotong,Liu Shilong,Misra R. D. K.,Sun Junhao
Currently, surface coatings on agricultural machinery are crucial for extending service life. However, achieving coating strength and toughness remains a challenge. In this paper, two types of high-hardness iron-based coatings, referred as S1 and S2, were prepared by modulating the Mo/V ratio in the Fe-C-V-Mo-B system, and their microstructural evolution and property changes were investigated. The results show that the S1 coating primarily consist of martensitic matrix, spherical VC, blocky Mo 2 B, and a small amount of skeleton-like Mo 2 B. In contrast, the S2 coating consist of martensitic matrix, petal-like VC, and skeleton-like Mo 2 B. Compared with S1, the VC volume fraction in S2 increases by 6.5%, and the Mo 2 B volume fraction increases by 16.3%. The average microhardness of S1 and S2 coatings are 737 HV 0.5 and 954 HV 0.5 , respectively, indicating that the S2 coating exhibits a 22.7% higher microhardness compared with S1. The average friction coefficients of S1 and S2 coatings are 0.434 and 0.398, respectively. Furthermore, the wear loss of S2 coating is approximately half that of S1. The fracture toughness of S1 and S2 coatings are 51.9 MPa·m 1/2 and 51.7MPa·m 1/2 , respectively. Fracture analysis reveals that the skeleton-like eutectic structure in S2 can deflect cracks generated by impact, increase the length of propagation path, and improve the toughness of coating. It allows S2 coating to achieve high hardness and wear resistance, while maintaining toughness comparable to S1 coating. This study provides a theoretical basis for the design and development of iron-based coatings with high hardness, high abrasion resistance, and impact resistance for agricultural machinery.
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Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 2
·403-412
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IF 4.036
Jian-Rong Li,Lei Xu,Ming-Lai Fu,Yun-Xia Wang,Hang Xiao
A facile strategy was designed to prepare magnetically layered chalcogenide Fe3O4/KMS-1 (FK) composite adsorbents combining the advantages of rapid magnetic separation and satisfactory adsorption performance under vigorous stirring in ethanol solution at room temperature. The dispersion degree of Fe3O4 in ethanol was superior to that in water, which gave a better result with the preparation in ethanol. Characterization by SEM-EDS, XRD, magnetic test, N2 physical-adsorption and TG-DTG demonstrated formation of FK and its adsorption performance. The results showed that the Fe3O4 microspheres could be well distributed over the surface of KMS-1 by electrostatic attraction in ethanol and the obtained FK could be easily separated from water after adsorption using a magnet. The pH slightly affected the adsorption capacity in the range of 3 to 6. Both KMS-1 and Fe3O4 retained their own original adsorption capacity in FK and FK0.3 was the best composite adsorbent when the mass ratio of Fe3O4 and KMS-1 was 0.3. As the amount of loaded Fe3O4 was decreased, the adsorption capacity of the composite adsorbents increased. The kinetic data of FK0.3 fit well with pseudo-second-order models. The co-existing ions had a slight effect on the removal of Zn(II) by FK0.3. The interlayer spacing of KMS-1 in FK increased from 0.851 nm to 1.123 nm after adsorption. The FK composite adsorbents can be considered as an excellent recoverable adsorbent in the treatment of wastewater.
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Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Guihong Han,Lulu Kou,Zhan Chu,Wenjuan Wang,Hongfei Ma,Bingbing Liu,Hu Sun,Shuzhen Yang,Yanfang Huang
Treatment of molybdenum-containing wastewater is crucial for mitigating the environmental threat of Mo(VI) ions and recovering valuable metals. Compared to conventional separation methods, adsorbing colloid flotation emerges as a viable way to efficiently remove Mo(VI) ions. However, the current colloidal adsorption reagents have constrained the development of adsorbing colloid flotation due to their poor removal efficiency and narrow solution pH range. To overcome these challenges, Zr(IV) salts and La(III) salts were employed as colloidal adsorption reagents for the first time to remove Mo(VI) ions from wastewater in this work. In particular, the differences in removal efficiency of Mo(VI) ions between Zr(IV) salts, La(III) salts and traditional Fe(III) salts were systematically evaluated over a wide solution pH range. Zr(IV) salts demonstrated robust pH stability, displaying a significant removal efficiency of over 70.00% for Mo(VI) ions during the colloidal adsorption stage across a broad solution pH range from 3 to 11. Even more astonishingly, the removal efficiency of Mo(VI) ions was further enhanced through the synergistic effect of cetyltrimethylammonium bromide (CTAB) during the flotation separation stage. Under the optimal conditions of bubble flotation, the solution turbidity decreased rapidly from 164.50 NTU to 3.33 NTU, and the removal efficiency of Mo(VI) ions reached an impressive 99.10% which was enhanced by 23.73% compared to the colloidal adsorption stage. In conclusion, Zr(IV) salts, serving as colloidal adsorption reagents, have overcome the limitations of traditional colloidal adsorption reagents and exhibit significant potential for the removal of Mo(VI) ions from wastewater.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Jiawen Hu,Linwen Jiang,Jiawei Jin,Hang Liu,Anhua Wu,Xiaofeng Zhang
High-entropy alloys (HEAs) are important candidates for efficient electromagnetic-wave absorbing (EMA) materials, but the further design of HEA absorbers with harmonized impedance matching and excellent environmental stability remains a major challenge. In this study, a novel carbonitriding process based on a mechanochemical method is employed to prepare carbonitrided FeCoNiMn HEAs by utilizing a cyano-compound (C3H2N2) as a source of C and N. The introduction of C and N effectively optimizes the permittivity of FeCoNiMn HEAs, achieving the equilibrium of electromagnetic matching and thus improving the EMA performances (especially the bandwidth). The carbonitrided FeCoNiMn HEAs exhibit significant reflection loss (RL) and absorption capability. FeCoNiMnM0.04 achieves a minimum RL of −65.8 dB at 3.44 GHz. FeCoNiMnM0.08 achieves an ultra-broad effective absorption bandwidth (EAB) of up to 7.76 GHz at 1.62 mm, covering the entire Ku-band. In addition, the carbonitrided FeCoNiMn HEAs exhibit excellent corrosion resistance and good mechanical properties, ensuring their suitability for harsh environments. This study highlights the potential of carbonitrided HEAs prepared using a cyano-compound as highly efficient EMA materials, and provides a reference for optimizing the electromagnetic matching of HEAs.
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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 39
·2404772
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IF 27.4
Ning Sun,Zhichuan Zheng,Zhuangzhuang Lai,Junjie Wang,Peng Du,Tianping Ying,Haifeng Wang,Jianchun Xu,Runze Yu,Zhiwei Hu,Chih-Wen Pao,Wei-Hsiang Huang,Ke Bi,Ming Lei,Kai Huang
While high-entropy alloys, high-entropy oxides, and high-entropy hydroxides, are advanced as a novel frontier in electrocatalytic oxygen evolution, their inherent activity deficiency poses a major challenge. To achieve the unlimited goal to tailor the structure–activity relationship in multicomponent systems, entropy-driven composition engineering presents substantial potential, by fabricating high-entropy anion-regulated transition metal compounds as sophisticated oxygen evolution reaction electrocatalysts. Herein, a versatile 2D high-entropy metal phosphorus trisulfide is developed as a promising and adjustable platform. Leveraging the multiple electron couplings and d–p orbital hybridizations induced by the cocktail effect, the exceptional oxygen evolution catalytic activity is disclosed upon van der Waals material (MnFeCoNiZn)PS 3 , exhibiting an impressively low overpotential of 240 mV at a current density of 10 mA cm −2 , a minimal Tafel slope of 32 mV dec −1 , and negligible degradation under varying current densities for over 96 h. Density functional theory calculations further offer insights into the correlation between orbital hybridization and catalytic performance within high-entropy systems, underscoring the contribution of active phosphorus centers on the substrate to performance enhancements. Moreover, by achieving electron redistribution to optimize the electron coordination environment, this work presents an effective strategy for advanced catalysts in energy-related applications.
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Science Advances
·
2024
·Vol. 10
·期 40
·
IF 11.7
Zhongliang Huang,Yingru Wang,Jing Xia,Shengnan Hu,Nanjun Chen,Tianyi Ding,Changhong Zhan,Chih-Wen Pao,Zhiwei Hu,Wei-Hsiang Huang,Tong Shi,Xiangmin Meng,Yong Xu,Liang Cao,Xiaoqing Huang
Pt-based nanoparticles (NPs) have been widely used in catalysis. However, this suffers from aggregation and/or sintering at working conditions. We demonstrate a robust strategy for stabilizing PtCo NPs under high temperature with strong interaction between M–N–C and PtCo NPs with Pt–M–N coordination, namely, “atom glue.” Such atom glue for stabilizing Pt-based NPs can be extended to Zn, Mn, Fe, Ni, Co, and Cu, being a versatile strategy for stabilizing PtCo NPs, which substantially promotes the performance toward oxygen reduction reaction (ORR) and fuel cell. Impressively, the mass activity (MA) reaches 2.99 A mgPt−1 for ORR over g-Zn–N–C/PtCo, and 79.3% of the initial MA is maintained after 90K cycles in fuel cell. This work provides a versatile strategy for stabilizing Pt-based NPs via atom glue, which is likely to spark widespread interest across various fields.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2025
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IF 10.3
Qi Sun,Hongshan Wang,Linlin Liu,Zuxin Chen,Junjie Li,Shilie Pan
Multifunctional semiconductors play an important role in developing advanced photoelectric technologies. In this work, based on an octahedral replacement strategy in chalcogenides, a new selenide semiconductor NaMn 3 Ga 3 Se 8 was rationally designed, and synthesized by the flux method. The compound crystallizes in the noncentrosymmetric (NCS) P 6 ¯ space group, and is composed of unique prismatic [NaSe 6 ], octahedral [MnSe 6 ] and tetrahedral [GaSe 4 ] motifs, inheriting the stable three-dimensional framework built by the octahedral and tetrahedral units in the A I Mg 3 II C 3 III Q 8 VI family. NaMn 3 Ga 3 Se 8 shows the largest known secondary nonlinear optical (NLO) response of ∼2.1 × AgGaS 2 (AGS) in the A I Mg 3 II C 3 III Q 8 VI family, and a high laser-induced damage threshold of ∼3.0 × AGS. Meanwhile, the introduction of Mn 2+ with unpaired 3 d electrons induces a strong red emission band (685–805 nm) under the excitation source of 496 nm, as well as a paramagnetic to antiferromagnetic (AFM) transition at 7.3 K. The results confirm that NaMn 3 Ga 3 Se 8 possesses multifunctional features including significant NLO response, fluorescence emission and AFM properties, and illustrate that replacing octahedral units with approaching size and geometry (like [MgSe 6 ] and [MnSe 6 ]) could be a feasible way to develop multifunctional chalcogenides.
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JOURNAL OF FOOD BIOCHEMISTRY
·
2025
·Vol. 2025
·期 1
·8616106
·
IF 4.2
Chen Chen,Zengrong Ye,Jianan Li,Na Liu,Bo Wang,Guoying Zhou
Rheum tanguticum petiole juice, widely consumed in Tibet as both a vegetable and an herb, exhibits varying chemical compositions depending on the production methods. This study aims to identify the bioactive components in raw juice using ultra-performance liquid chromatography–quadrupole time-of-flight tandem mass spectrometry (UPLC–QTOF–MS–MS) and analyze their antidiabetic properties through network pharmacology. In addition, the effects of the three types of membrane clarification were evaluated. A total of 36 compounds were identified, and a components–targets–pathways–disease network was constructed for diabetes treatment. Among the membranes tested, the 0.2 μm microfiltration membrane exhibited the highest permeate flux and retained significant amounts of total flavonoids, phenolics, and proanthocyanidins, making it the optimal choice for juice clarification. These findings lay the groundwork for the industrial processing and utilization of R . tanguticum petiole juice in China.
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INTERMETALLICS
·
2025
·
IF 4.8
Liangcai Du,Xiaoqing Liu,Qianqian Kong,Lichao Gong,Zhenhua Yao
Understanding the intricate phase transformations and their impact on the mechanical properties holds paramount importance in developing high entropy alloys (HEAs) with ideal properties, yet it remains challenging and underexplored. In this study, a series of novel CrFeMnNi (2-x) Ti x (x = 0, 0.5, 1, and 1.5 at.%) HEAs were meticulously designed based on the established Valence Electron Concentration (VEC) rule, with the VEC values systematically varied as the atomic composition (Ni, Ti) changed. The microstructure, phase transformation behavior, mechanical properties, and strengthening mechanisms were systematically investigated. We found that the HEA powders exhibited phase behavior consistent with the VEC rules. The spark plasma sintered (SPSed) HEA bulk samples exhibited a phase transformation attributed to the precipitation of Cr and Mn within the matrix, resulting in the formation of the σ phase. Quantitative calculation of the strengthening mechanisms revealed that grain boundary strengthening and precipitation strengthening were the primary contributors to the high strength of the HEA bulk samples. These findings not only advance the utilization of the VEC rules in HEA material design but also contribute to the understanding of the phase behavior and mechanical properties of HEAs, facilitating the design of high performance HEAs.
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RSC Advances
·
2025
·Vol. 15
·期 37
·30456-30465
·
IF 4.6
Jiangpeng Tang,Chang-ye Hui,Shunyu Hu,Wanyan Wu,Peishuo Cao,Jingwen Ling,Xueqin Yang,Zhenlie Huang,Yan Guo
Rapid, low-cost trace inorganic Hg(II) detection in environmental waters remains a critical public-health challenge. Here, we engineered Escherichia coli into a naked-eye whole-cell biosensor by coupling a redesigned MerR-Pmer element to the pyomelanin biosynthetic pathway. Three 4-hydroxyphenylpyruvate dioxygenase (HppD) homologs from Aeromonas media WS, Aeromonas hydrophila 4AK4, and Pseudomonas aeruginosa PAO1 were codon-optimized and functionally screened. The sensor strain of TOP10/pHg-PAO1 exhibited the broadest quantitative range (4.9–1250 nM) and the lowest detection limit (1.2 nM), outperforming most fluorescent counterparts. The water-soluble red-brown pyomelanin product was measured directly in the culture supernatants by absorbance at 400 nm, without requiring extraction. It remained chromogenically stable for at least 14 hours. The biosensor demonstrated absolute selectivity for Hg(II) in the presence of other ions, including Mg(II), Ca(II), Cd(II), Mn(II), Cu(II), Pb(II), and Zn(II), all at a concentration of 5 μM. It retained quantitative accuracy in tap, lake, and coastal seawater matrices. These features enable on-site, equipment-free screening of environmental waters and establish pyomelanin as a robust, user-friendly chromogenic reporter for next-generation whole-cell sensors.
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