CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Shi-Wei Fu,Jian Yang,Zong-Yan Zhao,Bao-Feng Shan,Jia-Xin Zhang,Jin Zhang,Qingju Liu,Jianyong Feng,Zhaosheng Li,Zhigang Zou
A profound understanding of the band-edge electronic structure is crucial for advancing the development of highly efficient photocatalytic materials and unraveling the underlying mechanisms. This study employs a unified and consistent assessment protocol, offering a systematic exploration of the inherent connections between the band-edge electronic structure and the photo(electro)catalytic performance of a series of delafossite ABO2 compounds (A = Cu, Ag; B = Al, Ga, In). These compounds exhibit characteristics of indirect bandgap semiconductors, with fundamental and optical bandgaps spanning from 1.45 to 3.57 eV. Notably, the Cu-based ABO2 compounds display a significantly larger fundamental bandgap and excel as photocathode materials when the B-site element is held constant. Among these, CuInO2 emerges as the most promising candidate, showcasing superior photo(electro)catalytic performance. Extensive density functional theory calculations unravel intricate insights into the interplay between the band-edge electronic structure and valence orbital hybridization of the A- and B-site elements, providing invaluable perspectives for comprehending and enhancing the photo(electro)catalytic performance of such compounds. The findings in this study not only establish robust theoretical foundations for integrating ABO2 compounds into the field of photo(electro)catalysis but also lay the groundwork for future material design and optimization.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Lin Cao,Yuanyuan Wang,Xueqing Yu,Zhilun Lu,Ge Wang,Minmin Mao,Bing Liu,Lei Cao,Hadi Barzegar Bafrooei,Matjaz Spreitzer,Dawei Wang,Kaixin Song
Ultra-low permittivity ( ε r ：4–5) Mg 2 Al 4– x (Ge 0.5 Mg 0.5 ) x Si 5 O 18 (0.12 ≤ x ≤ 0.28) and Mg 2 Al 4– y (Mn 0.5 Mg 0.5 ) y Si 5 O 18 (0.1 ≤ y ≤ 0.3) cordierite ceramics were fabricated by solid-state reaction method. The improvement in [(Si 4 Al 2 )O 18 ] hexahedral ring roundness significantly enhances the quality factor through the substitution of complex ionic pairs of Ge 0.5 Mg 0.5 /Mn 0.5 Mg 0.5 for Al lattice sites in the [(Si 4 Al 2 )O 18 ] hexahedral ring of these cordierite ceramics. Excellent microwave dielectric performances of Mg 2 Al 3.8 (Ge 0.5 Mg 0.5 ) 0.2 Si 5 O 18 and Mg 2 Al 3.8 (Mn 0.5 Mg 0.5 ) 0.2 Si 5 O 18 ceramics sintered at 1400 °C were demonstrated using the Hakki-Coleman resonant method with ε r = 4.676, Q×f = 186, 503 [email protected] GHz and 199,476 GHz @ 27.434 GHz, τ f = −20.02 ppm/°C and ε r = 4.807, Q×f = 101,420 [email protected] GHz and 143,005 GHz @ 27.366 GHz, τ f = −26.44 ppm/°C, respectively. These results present the potential application of high-quality cordierite in future B5G/6 G millimeter and terahertz communication frequency bands.
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高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 21
·6037-6046
·
IF 5.726
Min Zhong,Jungang Wang,Congbiao Chen,Zhancheng Ma,Litao Jia,Bo Hou,Debao Li
Herein, the shell–core-structured SiC–Al2O3@Al composite consisting of an Al metal core and a SiC–Al2O3 hybrid shell was synthesized by a straightforward preparation method. Compared with Al2O3@Al composites, the SiC-modified samples possess a meso–macroporous structure, high pore volume, wide pore size, and a special surface where active and inert components coexist. The ratio of inert to active components on the composite surface could be modulated by controlling the amount of SiC nanoparticles (NPs). Upon the decoration of SiC NPs, the degree of reduction of cobalt oxides and the density of active sites (Co0) increased significantly. Moreover, the SiC-modified catalysts exhibited lower apparent activation energy (Ea) and higher intrinsic reaction rate (TOF) mainly due to the electron-rich properties of Co NPs in the modified samples. Accordingly, the cobalt-weight normalized FT activity (CTY) of the SiC-modified catalysts increased by a factor of about 1.6–2.0. Moreover, the catalyst modified by the SiC NPs showed lower selectivity towards light hydrocarbons (CH4 and C2–C4) but higher selectivity towards long-chain hydrocarbons (C5+). When the mSiC/mAl ratio was 15%, the CoAC-15 catalyst showed maximum density of active sites and highest TOF, leading to highest activity and C5+ selectivity (approximately 92%). The synergistic effect of the SiC–Al2O3 hybrid shell and the Al metal core was beneficial for the catalytic properties of the Co/SiC–Al2O3@Al catalysts. The binary SiC–Al2O3 nanostructure endowed the Co NPs with electron-rich characteristics to enhance the CO activation; moreover, the special surface where the active and inert components coexisted improved the reducibility of cobalt oxides, and the abundant porosity of the hybrid shell facilitated the transfer of reactants and products. In addition, the existence of the Al metal core improved heat transfer in the reaction.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xiao Tan,Yinjie Zhang,Meng Liu,Jinman Cao,Guilan Duan,Jun Cui,Aijun Lin
Cr(VI) contamination in aquatic systems has been a challenge for environmental science researchers. To environmental-friendly, stable, and efficiently remove Cr (VI), a novel layered double hydroxide was prepared through the ultrasonic-assisted co-precipitation method. The ultrasonic-assisted step prevented the Fe 2+ oxidation, improved the morphology and performance, and finally, the adsorption-coupled reduction capacity and stability were enhanced. By adding U–Fe/Al-LDH (1.0 g/L) for Cr(VI) (100 mg/L), the removal rate reached 82.24%. The removal data were well fitted by the pseudo-second-order kinetic and Langmuir isotherm model. Using U–Fe/Al-LDH can be performed over a wide pH range (2–10), with a theoretical maximum removal capacity of 118.65 mg/g. The Cr(VI) with high toxicity was adsorbed and reduced to low-toxicity Cr(III). In the final phase, stable Cr(III) complex precipitates were generated. After 30 days, the dynamic leaching amounts of total Cr in used U–Fe/Al-LDH-2 were 0.1052 mg/L. Combined with the results of the influence experiment of coexisting anions and oxidants and the SO 4 2− release experiment, the stability of the removal effect and the safety of U–Fe/Al-LDH were proved. In conclusion, U–Fe/Al-LDH-2 is a promising remediation agent and a feasible Cr(VI) removal method for the practical remediation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Jiang Chang,Ying Qin,Weimin Guo,Jingyuan Zhang,Kuo Zhang,Jianhua Zheng,Lijian Sun,Qiu Fu
The facile and eco-friendly fabrication of a fabric with remarkable flame retardancy, anti-ultraviolet (UV), and superhydrophobic properties is of significant interest for multitask requirements. In this regard, herein, a nonfluorine, facile, and green method is reported for in situ synthesis of metal-organic frame (NH 2 -MIL-53(Al)) on hemp fabric (HF) for the preparation of multifunctional textiles. A homogeneous and compact coating of NH 2 -MIL-53(Al) crystals was deposited on HF, followed by modification with triethoxyoctylsilane (TEOS) to manufacture superhydrophobic NH 2 -MIL-53(Al)@hemp fabric (SM(Al)HF-9), significantly enhancing its water stability. The SM(Al)HF-9 exhibited superior superhydrophobicity properties, with a water contact angle (WCA) up to 156°. Furthermore, the surface of SM(Al)HF-9 cannot be adhered by dye solution and powder, indicating its good self-cleaning and anti-fouling abilities. The SM(Al)HF-9, characterized by a porous structure, effectively separates tetrachloromethane and n-hexane from water mixtures with a separation efficiency exceeding 97 %. The SM(Al)HF-9 has excellent UV-blocking properties, and the UV protection factor is as high as 105.44. Encouragingly, the SM(Al)HF-9 exhibited outstanding flame retardancy, as demonstrated by its self-extinguishing capability and a substantially improved limiting oxygen index (LOI) of 32.4 %. In comparison to raw HF, the peak heat release rate (PHRR) and total heat rate (THR) of the modified HF are reduced by 76.15 % and 54.32 %, respectively. Meanwhile, the NH 2 -MIL-53(Al) has a significant advantage over other MOFs (e.g., ZIF-67, Ce-MOF, Ag-MOF, Fe-MOF and MIL-53(Al)) in improving the flame retardancy of HF. The highly efficient flame-retardant, anti-UV, and superhydrophobic fabric is promising in home and public decoration, and fire protection fields.
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PubMed
高影响因子
GREEN CHEMISTRY
·
2021
·Vol. 23
·期 7
·2640-2651
·
IF 10.182
Zhicheng Jiang,Mi Gao,Javier Remón,Wei Ding,Changwei Hu,Bi Shi
This work addresses the manufacturing of a pioneering chrome-free tanning agent, consisting of ‘Al–Zr-oligosaccharides’ produced from biomass. First, a microwave-assisted AlCl3–H2O2–H2O reaction system was used for the simultaneous degradation and oxidation of hemicellulose in corncob. The obtained aqueous solution containing ‘Al-oligosaccharides’ was then combined with Zr to produce water-soluble ‘Al–Zr-oligosaccharides’. These species behaved as a ‘Trojan horse’, allowing the uniform and controlled penetration of Al and Zr into the leather, avoiding their accumulation on the surface. The effects of the reaction temperature and the AlCl3 and H2O2 concentrations used during the synthesis were systematically analyzed. Increases in the temperature and AlCl3 concentration improved the hemicellulose conversion, while the use of high H2O2 concentrations augmented the amounts of –CHO/–COOH functionalities in the oligosaccharides, with both phenomena being paramount for the efficient formation of ‘Al–Zr-oligosaccharides’. However, more severe reaction conditions led to the formation of an undesirable species, negatively influencing the tanning performance and chromaticity of the tanning agent. Given this, these parameters were optimized, and it was found that it is possible to convert up to 72 wt% of the hemicellulose present in corncob into an ‘advanced Trojan horse tanning agent’ contained in a colorless water solution, conducting the synthesis at 129 °C with a solvent comprising 56 mM AlCl3 and 2.6 vol% H2O2. The application of this solution for leather tanning provided leather with a shrinkage temperature as high as 87 °C, thus meeting the restrictive requirements of the leather industry. Therefore, these results are a landmark achievement in this field and represent a step forward to a sustainable and renewable leather industry.
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Nanoscale
·
2019
·Vol. 11
·期 18
·8967-8977
·
IF 6.97
Li Li,Rui Zhao,Tinghua Xu,Dandan Wang,Du Pan,Kun Zhang,Caiyan Yu,Xia Lu,Guanjie He,Ying Bai
LiNi0.5Mn1.5O4 (LNMO) spinel has drawn increasing attention due to its high voltage, stabilized electrochemical performance and safety features as a cathode for lithium-ion batteries. However, the main challenge lies in its unstable surface structure, especially at elevated temperatures. In this paper, we decorate the LNMO precursor with a solid electrolyte of Li1.4Al0.4Ti1.6(PO4)3 (LATP) via a facile sol–gel method, followed by a co-crystallization process at 820 °C, to successfully generate a LATP modification shell at the surface of LNMO. The LATP modification shell could not only optimize the morphology of LNMO including the limitation of particle growth and control of crystalline orientation, but also realize ion doping during the co-crystallization process. By tuning the LATP contents, the 2 wt% LATP modification is found to be the most effective at balancing the interfacial stability and Li+ diffusion kinetics of LNMO, as well as enhancing its rate capability and capacity retention at high temperatures. As a result, the 2 wt% LATP-modified LNMO cathode exhibits a high reversible capacity of 84.8 mA h g−1 after 500 cycles with a capacity retention of 68.9%, and a superior rate capability (102.0 mA h g−1 at 20 C) at room temperature. Moreover, this electrode also delivers a good capacity retention of 85.7% after 100 cycles at 55 °C, which is ascribed to the stabilized interface with a LATP protective layer.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Youjie Sheng,Haoyu Li,Hanling Zhang,Yang Li,Baohu Li,Li Ma
Nanoparticles (NPs) and polymers are frequently combined to improve firefighting foam performance, but whether the effect of polymer addition depends on NP type remains unclear. In this study, Al(OH)₃ and β-Al₂O₃ NPs were separately incorporated into an FS-50/APG-0810 surfactant system and further combined with xanthan gum (XG) or guar gum (GG). The foaming ability, rheology, and drainage resistance of the resulting foams were systematically compared, while crossover strain and modulus of cohesion (MOC) were used to characterize deformation tolerance and resistance to structural breakdown. Polymer addition produced opposite effects in the two NP systems: XG and GG generally weakened the rheological properties and drainage resistance of Al(OH)₃ NP-stabilized foams, but enhanced those of β-Al₂O₃ NP-stabilized foams. Selected β-Al₂O₃ formulations were further evaluated for fire suppression performance. Among the tested formulations, the β-Al₂O₃/XG foam achieved the shortest extinguishment time of 22 s, whereas the β-Al₂O₃/GG foam exhibited the longest burn-back time of 1243 s. Unlike previous studies focusing on individual NP or NP/polymer systems, this work demonstrates that polymer-induced foam regulation is strongly dependent on NP type and that nanoparticle/polymer combinations do not necessarily produce universal synergistic effects. These findings provide a basis for rational NP/polymer matching to balance rapid extinguishment and burn-back resistance in firefighting foam formulation. Download: Download high-res image (243KB) Download: Download full-size image
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Xiaobin Zhan,Guanghui Zhu,Lei Yu,Ruyi Hu,Yiru Ren,Hongyong Jiang
To improve the bonding strength of CFRP/Al joints, a novel hierarchical interface through anodization, ZnO nanosheet growth and improved Resin Pre-Coating (RPC) with nano-SiO 2 is designed and its hierarchical failure mechanisms are studied. Porous Al substrates are prepared via anodization, followed by in-situ growth of ZnO nanosheets and infiltration of RPC solution containing nano-SiO 2 to enhance mechanical interlocking at nano-scale. Systematic characterizations including single-lap shear testing, SEM and XRD are conducted to evaluate interfacial morphology, wettability and mechanical properties. Results show that optimal porous surface microstructure and interfacial wettability are obtained by the effect analysis of anodizing time. In surprise, the combined treatment of ZnO nanosheets and improved RPC with nano-SiO 2 shows an increase in the shear strength over 400 % compared to untreated joints. Macro and micro failure modes reveal that the interfacial failure is transitioned to cohesive failure with fiber tearing and resin/SiO 2 interface debonding. The synergistic strategy effectively improves the hierarchical failure through enhanced nano-interlocking and adhesive reinforcement, offering a promising pathway for designing and manufacturing high-strength CFRP/Al joints.
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高影响因子
POWDER TECHNOLOGY
·
2026
·
IF 5.5
Xiya Qiao,Yaqiang Yuan,Zhijun He,Jihui Liu,Wenlong Zhan,Lihua Gao,Xiao Han,Haibin Zuo
Increasing Fe/Al molar ratio promoting better assimilation of iron ore powder. • The inter-particle bonding ability of SFCA can be evaluated by osmotic pressure. • Lower Fe/Al ratios coupled with slower cooling promote dendritic SFCA formation. • Higher crystallization rate enhances hardness but reduces elastic modulus of SFCA. • Optimizing SFCA micromechanical properties through Fe/Al ratio and cooling rate. Iron ore sintering represents a critical agglomeration process wherein the silico-ferrite of calcium and aluminum (SFCA) phase governs the consolidation behavior and final product quality. In this study, the effects of Fe/Al molar ratio (4.53 to 12.27) and cooling rate (50 to 200 °C/min) on SFCA characteristics in Fe 2 O 3 -CaO-SiO 2 -Al 2 O 3 systems were systematically investigated by using X-ray diffraction, in situ thermal analysis platform, Raman spectroscopy, Scanning electron microscope (SEM) and nanoindentation. Increasing Fe/Al ratio could reduce the liquid phase formation temperature and enhance the melt fluidity, promoting better assimilation of iron ore powder. Meanwhile, optimal inter-particle bonding occurred with optimal osmotic pressure achieved at 300 to 350 s of high-temperature maintenance. Higher cooling rates significantly accelerated crystallization kinetics, leading to refined microstructures with dispersed crystalline phases. Notably, lower Fe/Al ratios coupled with slower cooling promoted dendritic SFCA formation, while accelerated crystallization enhanced hardness but compromised elastic modulus. The influence of slower cooling rates on crystallization rate and micromechanical properties was more pronounced in sintered liquid phases with lower Fe/Al molar ratios. These findings provide crucial insights into the fundamental mechanisms governing SFCA formation in iron ore sintering, offering practical strategies for optimizing sintering parameters through precise regulation of chemical composition and thermal conditions. Download: Download high-res image (126KB) Download: Download full-size image
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高影响因子
ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 6
·925-933
·
IF 1.6
Tang Tingfan,Li Xiaohui,Zhu Jiaqing,Huang Wenyi,Cheng Hao,Feng Jun
In this paper, a polymer monolithic column based on poly (Butyl methacrylate-co-ethylene glycol dimethacrylate) (poly (BMA-co-EDGMA)) doped with MIL-53(Al) metal–organic framework (MOF) was prepared using an in situ polymerization method. The characteristics of MIL-53(Al)-polymer monolithic column were studied through scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), energy-dispersive spectroscopy (EDS), X-ray powder diffractometry (XRD), and nitrogen adsorption experiment. Due to its large surface area, the prepared MIL-53(Al)-polymer monolithic column has good permeability and high extraction efficiency. Using MIL-53(Al)-polymer monolithic column for solid-phase microextraction (SPME), coupled to pressurized capillary electrochromatography (pCEC), a method for the determination of trace chlorogenic acid and ferulic acid in sugarcane was established. Under optimized conditions, chlorogenic acid and ferulic acid have a good linear relationship ( r ≥ 0.9965) within the concentration range of 50.0–500 µg/mL, the detection limit is 0.017 µg/mL, and the relative standard deviation (RSD) is less than 3.2%. The spike recoveries of chlorogenic acid and ferulic acid were 96.5% and 96.7%, respectively. The results indicate that the method is sensitive, practical, and convenient. It has been successfully applied to the separation and detection of trace organic phenolic compounds in sugarcane samples. Graphical abstract
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zongyi Deng,Xueyuan Yang,Xiaobo Yu,Zhixiong Huang,Di Zhu,Minxian Shi
Carbon fiber/phenolic resin composites (CF/Ph) have attracted great interests in the field of thermal protection materials for their characteristics of high specific strength and easy manufacturing. However, CF/Ph are inherently susceptible to oxidation failure at elevated temperatures. In this study, a novel Al-coated carbon fiber/boron phenolic resin ceramizable composite modified with TiB 2 and B 4 C was fabricated by an impregnating and compression molding route. Thermal stability, flexural strength , microstructure and phase evolution of the resulting ceramizable composite were studied. The residue yield at 1400 °C and flexural strength after treated at 1400 °C for 15min was 90.4% and 53.1 MPa, respectively, which was increased by 15.9% and 532.1% than that without ceramizable fillers. Surface defects generated by matrix pyrolysis were well healed, and PyC and carbon fibers were covered with dense ceramic layers while the fracture surface was covered with relatively continuous ceramic layers without visible pores. Multiphase ceramics composed of TiB 2 , TiO 2 , TiC and PyC were identified. Furthermore, oxidation failure and anti-oxidation mechanism was revealed based on the aforementioned characterizations and thermodynamic calculation results. Oxidation resistance got enhanced markedly for synergistic effects of oxygen consuming, carbon fixation, oxygen barrier and endothermic effect, which were derived from ceramization reactions between TiB 2 , B 4 C, O 2 , Al and PyC.
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危险品化学品经营许可证（带存储）