JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Sain Bux Jamali,Tauqeer Haidar Qamar,Sibt ul Hassan,Nouman Ahmed,Ijaz Ahmad,Pengkun Xia,Shakeel Ahmad,Shengxiang Huang,Lianwen Deng
The escalating demand for effective electromagnetic interference shielding, particularly in the challenging low-frequency microwave range such as S-band, underscores the need for advanced high-performance electromagnetic absorbing materials. Herein, three-dimensional (3D) nickel/nitrogen-doped porous carbon foam decorated with carbon spheres (3D Ni/NPCF@CS) was synthesized for S-band microwave absorption. This unique design capitalizes on the synergistic interplay between the highly conductive and porous 3D carbon skeleton, the magnetic properties of encapsulated Ni nanoparticles, and the enhanced interfacial polarization provided by the conductive polypyrrole coating. This engineered hierarchical architecture created abundant heterogeneous interfaces and microwave loss pathways. Detailed electromagnetic analysis revealed that the optimized Ni/NPCF@CS composite material exhibited exceptional reflection loss (RL) performance of −57.8 dB at 3.44 GHz. The dominant absorption mechanisms, including dielectric loss from dipole polarization, conductive loss, and magnetic loss from Ni nanoparticles, were thoroughly investigated and discussed. This study provides valuable insights into the development of 3D-foam-based microwave-absorbing materials, particularly for their practical implementation in the S-band.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Yi Zhou,Anze Shui,Mei Cai,Hulei Yu
Photocatalytic hydrogen evolution from water has emerged as a pivotal approach for the generation of sustainable energy. In this study, the Zn 0.5 Cd 0.5 S/TiO 2 ( x ZCST, where x denotes the molar ratio of ZCS to TiO 2 ) nanofibers S-scheme heterojunction is successfully synthesized via the hydrothermal deposition of Zn 0.5 Cd 0.5 S (ZCS) nanoparticles onto the surface of TiO 2 nanofibers. In comparison to pure TiO 2 and ZCS, the as-prepared x ZCST photocatalyst exhibits a significantly enhanced photocatalytic hydrogen evolution performance. Under simulated sunlight irradiation, a maximum hydrogen evolution rate of 16.68 mmol g −1 h −1 is achieved in the 3ZCST sample, which corresponds to 1.78 times that of ZCS and 57.52 times that of TiO 2 , respectively. Further investigations have substantiated the formation of the internal electric field and charge transfer process within the S-scheme heterojunction, demonstrating the difference between the Fermi levels of TiO 2 and ZCS, as well as the migration of electrons from TiO 2 to ZCS under illumination. Such an S-scheme heterojunction is also found to effectively facilitate the separation of photogenerated electron-hole pairs and preserve strong redox capabilities, significantly enhancing photocatalytic hydrogen production. These findings offer valuable insights and guidance for designing high-performance S-scheme heterojunction photocatalysts.
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DESIGNED MONOMERS AND POLYMERS
·
2017
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IF 1.139
Yuxuan Zhang,Shuang Wang,Zhonghui Wang,Saisai Gai,Xi-Ming Song
A series of novel poly(arylene ether)s with crosslinked groups and different azobenzene chromophores contents (azo-CPAEs: PAE-allyl20%-azo20%, PAE-allyl20%-azo40%, PAE-allyl20%-azo60%) were synthesized from a new bisfluoro monomer, (2,6-difluorophenyl)-(4-hydroxyphenyl)methanone. Their chemical structures were characterized by means of UV-vis and FI-IR. The thermal properties of the polymers were investigated by TGA and DSC, indicating the polymers had high glass transition temperatures (Tg > 147 °C) and good thermal stability (Td5 > 360 °C) even when the contents of azobenzene chromophores was high to 60%. And the influence of thermal crosslinking on the performance of PAE-allyl20%-azo20%, a typical one of the series, was investigated. Tg of PAE-allyl20%-azo20% increased with the increase of heating time when heat-treated at 250 °C for 20, 40 and 60 min, indicating the crosslink degree of the polymer increased. After heat-treated for 60 min, Tg of PAE-allyl20%-azo20% increased to 175 °C from 147 °C before thermal crosslinking. Upon irradiation with a 532 nm neodymium doped yttrium aluminum garnet (Nd:YAG) laser beam, the remnant value of the polymer PAE-allyl20%-azo20% before and after the thermal crosslinking were 81 and 96%, respectively, meaning that the PAE-allyl20%-azo20% after thermal crosslink showed more stable photoinduced alignment than that before thermal crosslinking.
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ACS Nano
·
2026
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IF 16
Xiulin Xie,Gaoyu Liu,Yu Zhang,Yiqing Yang,Wentao Niu,Ouyang Lin,Yangyang Bian,Jin Lu,Shengli Zhang,Aiwei Tang
I–III–VI group semiconductor nanocrystals (NCs) with narrow-bandwidth emission have emerged as promising candidates for display technologies due to their tunable emission wavelength and eco-friendly composition. Herein, Ga-rich Ag–In–Ga–S (AIGS) NCs exhibited a narrow photoluminescence emission with a full width at half maximum (fwhm) of 29 nm, which was derived from In-rich Ag–In–Ga–S NCs with an fwhm of 113 nm via a cation exchange strategy. The evolution process was studied systematically using steady- and transient-state spectroscopic techniques, revealing that the narrow photoluminescence (PL) bandwidth primarily originated from free-to-bound radiative recombination. The result was consistent with first-principles calculations. Furthermore, the electroluminescent devices based on AIGS NCs showed a record narrow electroluminescent bandwidth of less than 30 nm, and the maximum external quantum efficiency (EQE) could reach up to 1.2%.
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Nanomaterials
·
2026
·Vol. 16
·期 10
·620
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IF 4.8
Hongxu Jin,Huifang Pang,Renguo Guan,Siqi Yin,Wang An,Changfeng Wang
Effective absorption in the S-band usually requires relatively thick absorbing materials. However, growing application demands necessitate the development of high-performance materials with subwavelength thickness. This study presents a broadband absorbing metamaterial for the S-band, based on a novel structural design featuring a nested hexagonal metal resonant layer integrated with a carbonyl iron powder (CIP)/charcoal (CH)/epoxy resin (ER) composite slab. This structural innovation enables exceptional S-band absorption within a subwavelength thickness, effectively overcoming the inherent physical limitations of traditional materials. By combining the arch measurement method and simulations over the 2–18 GHz, we demonstrate that the metal resonant layer of the metamaterial plays a key role in controlling the electromagnetic field vector distribution. This work investigates the mechanism for enhancing S-band absorption in metamaterials through the redistribution of electromagnetic field vectors. Additionally, magnetic loss from CIP/CH/ER and dielectric loss from the resonators further enhance absorption performance. The designed absorbing metamaterial exhibits effective absorption at a thickness of only 2.25 mm, with a reflection loss (RL) below −10 dB from 2.2 to 3.8 GHz. Simultaneously, it can maintain a radar cross-section (RCS) below −10 dBm2in a wide-angle range of ±160°. Furthermore, a superhydrophobic coating with a contact angle of 152° was prepared for absorbing metamaterial. This coating allowed the metamaterial to preserve its microwave absorption performance while imparting self-cleaning capability. This study proposes a multifunctional absorbing metamaterial for efficient absorption in the S-band.
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INORGANIC CHEMISTRY
·
2026
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IF 4.6
Zhen Sun,Chenming Zhou,Teng Wang,Zhixin Gao,Jin Sun,Renquan Hu,Meng Yan,Zhaolin Na,Ran Su,Yong Yang
Photocatalytic CO2 reduction offers a green strategy to alleviate climate change and address the energy crisis. In this work, indium oxysulfide subnanocoils with a thickness of 0.9 nm were successfully synthesized via a facile solvothermal method. Adjusting the sulfur content not only modulates the band structure and energy level positions but also enables precise control over the morphology of the as-prepared products. The optimized indium oxysulfide subnanocoils exhibit excellent photocatalytic activity for CO2 reduction, with a CO evolution rate of 61.731 μmol h–1 g–1, which ranks among the best performances for indium-based materials reported to date. The enhancement of photocatalytic performance can be attributed to the exceptionally high surface atomic exposure ratio of the unique subnanometer coiled structure. Meanwhile, the sulfur substitution-induced S–O coordination significantly reduces the average valence state of indium, narrows the band gap, and improves the reduction capability of photogenerated electrons. This study provides a feasible approach for the development of high-performance subnanoscale photocatalysts for CO2 reduction.
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Catalysts
·
2026
·Vol. 16
·期 4
·334
·
IF 4.5
Yu Chen,Xuan Chen,Huimei Wu,Hai-Jian Yang,Qingqing Jiang,Juncheng Hu,Cun-Yue Guo
The formylation of mercaptans using CO2as a C1 source represents a sustainable and efficient strategy for converting CO2into value-added chemicals. However, to date, S-formylation still remains scarcely explored with CO2as the starting material, despite its important role in various biological processes. In this work, the S-formylation reaction between CO2and mercaptans was successfully carried out to construct C-S bonds using an inexpensive and commercially available carboxylate salt (sodium edetate) as the catalyst under mild conditions (25 °C and 0.1 MPa). Further investigations demonstrated that the present catalytic system applies to a broad substrate scope, affording moderate to excellent yields in the S-formylation of both aliphatic and aromatic thiols with CO2. To clarify the excellent catalytic performance of carboxylates in these S-formylation reactions, reaction intermediates as well as the activating effects of carboxylates on carbon dioxide and phenylsilanes were identified through control experiments and spectroscopic analysis. Based on these findings, the reaction pathway of the S-formylation process was determined, and a corresponding reaction mechanism is proposed.
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Journal of Energy Chemistry
·
2023
·
IF 13.1
Tong Dou,Jinqing He,Shuteng Diao,Yiping Wang,Xuhui Zhao,Fazhi Zhang,Xiaodong Lei
As the “emission peak and carbon neutrality peak” are proceeding all over the world, CO 2 electroreduction is studied extensively as it is a powerful way to transform CO 2 into value-added products. The earth-abundant Sn-based materials and copper sulfides as electrochemical catalysts have shown activity for generating formate from CO 2 electroreduction. Herein, the composite of CuS and S-doped SnO 2 (CuS/SnO 2 -S) was synthesized by a redox reaction under room temperature. The unique structural reconstruction of CuS/SnO 2 -S nanoparticles to Cu/Sn/Cu 6.26 Sn 5 nanowires decreases the energy barrier of the adsorption of CO 2 , and increases the adsorption of *H, primarily suppressing the competing reaction of hydrogen evolution reaction (HER). As a result, at − 0.8 V vs. RHE , it reaches an electrochemical CO 2 -to-formate conversion with a Faradaic efficiency (FE) of 84.9% at a yield of 8860 µmol h −1 cm − 2 under a partial current density of ∼18.8 mA cm − 2 in an H-type reactor. This study provides significant insight into the structural evolution of the CuSn sulfides and the mechanism of formate formation.
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PEST MANAGEMENT SCIENCE
·
2023
·Vol. 79
·期 8
·2725-2736
·
IF 4.1
Qi Li,Ning Zhao,Minghao Jiang,Mali Wang,Jingxu Zhang,Haiqun Cao,Min Liao
BACKGROUND Echinochloa glabrescens Munro ex Hook. f. is one of the main Echinochloa spp. seriously invading Chinese rice fields and has evolved resistance to commonly used herbicides. Previously, an E. glabrescens population (LJ-02) with suspected resistance to the acetyl-CoA carboxylase (ACCase)-inhibiting herbicide metamifop was collected. This study aimed to determine its resistance status to metamifop and investigate the internal molecular mechanisms of resistance. RESULTS Single-dose testing confirmed that the LJ-02 population had evolved resistance to metamifop. Gene sequencing and a relative expression assay of ACCase ruled out target-site based resistance to metamifop in LJ-02. Whole-plant bioassays revealed that, compared with the susceptible population XZ-01, LJ-02 was highly resistant to metamifop and exhibited cross-resistance to fenoxaprop- P -ethyl. Pretreatment with the known glutathione S -transferase (GST) inhibitor, 4-chloro-7-nitrobenzoxadiazole (NBD-Cl), largely reversed the resistance to metamifop by approximately 81%. Liquid chromatography–tandem mass spectrometry analysis indicated that the metabolic rates of one of the major metabolites of metamifop, N -(2-fluorophenyl)-2-hydroxy- N -methylpropionamide (HPFMA), were up to 383-fold faster in LJ-02 plants than in XZ-01 plants. There were higher basal and metamifop-inducible GST activities toward 1-chloro-2,4-dinitrobenzene (CDNB) in LJ-02 than in XZ-01. Six GST genes were metamifop-induced and overexpressed in the resistant LJ-02 population. CONCLUSION This study reports, for the first time, the occurrence of metabolic metamifop resistance in E. glabrescens worldwide. The high-level metamifop resistance in the LJ-02 population may mainly involve specific isoforms of GSTs that endow high catalytic activity and strong substrate specificity. © 2023 Society of Chemical Industry.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lufang Fan,Jiahui Han,Kai Wei,Changchang Ma,Sheng Feng,Yun Zhou,Xiaojun Dai,Zhiwei Ye,Yang Wang
This study aimed to regulate the band structure and enhance the reduction ability of CdS by substituting it with Mn 2+ . Subsequently, this nano MnCdS solid solution was anchored on the surface of truncated octahedral Cu 2 O through a simple hydrothermal process, forming an S-scheme heterojunction at the interface between MnCdS and Cu 2 O. Equilibrating the Fermi level at the MnCdS/Cu 2 O heterojunction led to spontaneous diffusion of electrons in MnCdS to Cu 2 O, generating an internal electric field that drove the recombination of electrons in the conduction band (CB) of Cu 2 O and holes in the valence band (VB) of MnCdS. Consequently, this process preserved the powerful photogenerated electrons in the CB of MnCdS, facilitating robust photocatalytic hydrogen evolution . The MnCdS/Cu 2 O exhibited a photocatalytic hydrogen evolution rate of 66.3 mmol g −1 h −1 , which was 3.4- and 54.3-times higher than that of MnCdS (19.4 mmol g −1 h −1 ) and Cu 2 O (1.2 mmol g −1 h −1 ), respectively. This study elucidates advanced S-scheme heterojunction catalyst architectures for photocatalytic hydrogen production.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhipeng Mao,Wei Hao,Wei Wang,Fubin Ma,Chengcheng Ma,Shougang Chen
As an influential antifouling material, photocatalytic materials have drawn attention increasingly over recent years owing to their potential bacteriostatic property in the domain of marine antifouling. Herein, a flower-like BiOI@CeO 2 @Ti 3 C 2 S-scheme photocatalyst was contrived and prepared by hydrothermal method . The innovative combination of Ti 3 C 2 and narrow band gap semiconductor BiOI was implemented to modify CeO 2 and the photocatalytic bacteriostatic mechanism of BiOI@CeO 2 @Ti 3 C 2 was elucidated. Schottky junction was formed between CeO 2 and Ti 3 C 2 , and a p-n junction was formed between CeO 2 and BiOI. By photoelectrochemical characterization, BCT-10 exhibits the best photoelectrochemical performance of which photogenerated carrier transport can be performed more readily at 10 % CeO 2 @Ti 3 C 2 addition. 99.76 % and 99.89 % of photocatalytic bacteriostatic efficiency of BCT-10 against Escherichia coli and Staphylococcus aureus were implemented respectively, which were 2.98 and 3.07 times higher than that of pure CeO 2 . The ternary heterojunction can suppress photogenerated electron-hole complexes more effectively and enhance the photocatalytic bacteriostatic effect of CeO 2 , which also provided a new concept to the further broadened application of CeO 2 in the marine bacteriostatic and antifouling field.
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2023
·
IF 5.8
Qiang Huang,Zhiren Zou,Xiaobo Li,Qinwen Xiao,Guang Liang,Wenqi Wu
The drug-amino acid co-amorphous systems and amorphous solid dispersions (ASDs) are promising methods to address the poor water solubility of poorly water-soluble drugs. However, some amino acids might not be perfect co-formers for co-amorphous systems, and the relatively low drug-loading of many ASDs is one of the main disadvantages of ASDs. Thus, poly- l -lysine and polyglutamic acid were selected as the co-formers, ball milled with basic mebendazole, neutral tadalafil and acidic valsartan at different weight ratios (from 3:1 to 1:3) to prepare poly (amino acid)-based ASDs, aiming to combine the advantages of co-amorphous systems (high drug-loading) and ASDs (relatively high T g and high physical stability). All the mixtures were converted into amorphous after milling. The powder dissolution studies showed that drug-poly (amino acid) ASDs improved the dissolution rate of the drug in different ways and to different degrees. Moreover, the two poly (amino acid)s enhanced the physical stability of amorphous drugs. It is worthy to mention that the salt formation between the drug and the poly (amino acid) does not necessarily mean better performance compared to non-salt forming systems, and salt formation is also not a prerequisite for the formation of promising drug-poly (amino acid) ASDs.
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