PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Zhihao Zhao,Hao Jiang,Meng Cheng,Shuai Wang,Shuangqing Sun,Chunling Li,Songqing Hu
Although aluminum alloys are widely used in various industries, their wear and corrosion resistance are still needed to be enhanced. In this study, a robust anti-corrosion composite coating was prepared on the surface of Al alloy based on multiple reinforcement strategies. The composite coating is consisted of horizontally arranged and functionally modified h-BN nanosheets doped SiO 2 coating (SiO 2 -hBN(NH 3 + ) coating) and corrosion inhibitor MBT loaded porous anodic alumina (PAA-MBT) film. Results show that the composite coating prepared in this work has excellent corrosion resistance due to the effect of the extended penetration path of corrosive medium by h-BN(NH 3 + ) nanosheets, the full-thickness hydrophobicity of the SiO 2 coating, the corrosion inhibition of the MBT released from the PAA film and the physical barrier of the entire coating system. In addition, the composite coating also exhibits good mechanical properties including high hardness, high bonding strength and superior wear resistance. This work provides a novel design of protective coating with excellent anti-corrosion resistance and mechanical properties, which has a promising prospect in the development of superior long-term anti-corrosion coatings for aluminum alloy.
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高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 6
·3517-3531
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IF 4.9
Zhang Shanbei,Chen Zanmei,He Hongwei,Jiang Yijun
The alkali/urea system is an economical and environmentally friendly solvent system for dissolving cellulose. However, the mechanical performance of cellulose derived materials (such as fibres or films) treated with alkali/urea must be improved. The capacity of this system for cellulose dissolution is limited and the mechanical properties of the regenerated cellulose fibres are still unsatisfactory. Here, cotton linter pretreated with peracetic acid (PAA) was dissolved in a LiOH/urea aqueous suspension in which Zn–Al layered double hydroxide (Zn–Al LDH) nanosheets (NS thickness = 3 nm) were exfoliated in situ. After wet spinning, the strength and toughness of the regenerated cellulose fibres reached 290 ± 7.66 MPa and 23.5 ± 4.40 MJ/m 3 respectively, which were 66.7% and 150% higher than those without the LDH NS treatment. It is interesting to note that the synergistic effect of Zn 2+ and Al 3+ distributed on the surface of the LDH host layer significantly improved the solubility of cellulose at low temperature and the interaction between the cellulose and LDH NSs also improved the mechanical performance. This work provides a strategy for improving both the solubility of cellulose in the alkali/urea system and the mechanical properties of regenerated cellulose fibres. Graphical abstract
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Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Xuewu Li,Chenghu Ma,Tian Shi,Hejie Yang,Chuanwei Zhang,Wei Qi,Chen Li,Rongrong Liu,Weiping He,Yuanhai Liu
Aluminum-Lithium (Al-Li) alloys widely used in aerospace manufacture are highly susceptible to corrosion, which limits their industrial applications. Herein, 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) is used as a modifier for low-surface-energy treatment of TiO 2 nanoparticles. The water-based polyurethane (PU) is made as a binder to achieve a tight bonding between modified ceramic particles and Al-Li alloy, thus resulting in the extremely-feasible air-spraying preparation of a superhydrophobic coating with strong abrasion resistance. The water contact angle (CA) of as-prepared coating achieves 160 ± 0.83°, and the rolling angle (SA) is as low as 5.95 ± 0.59°. The surface structure, organization and composition are further characterized using SEM, EDS, XPS and laser confocal microscopy. Meanwhile, the electrochemical impedance and potentiodynamic polarization tests are performed for corrosion characterization. The results show that the corrosion potential of such coating increases by 170 mV compared with substrate, the corrosion current density decreases by two orders of magnitude, and the impedance modulus increases by two orders. The corrosion inhibition rate of the as-prepared coating is 98.8%, indicating that the corrosion resistance has been significantly enhanced. In addition, the mechanical robustness and stability of the coating is evaluated and confirmed using a sandpaper rubbing test. It also possesses great self-cleaning, anti-pollution and thermostable behaviors, thereby allowing them to work in extreme manufactures. Moreover, the as-prepared coating exhibits excellent adaptability to various materials and anti-icing property. This work sheds positive insights in enlarging industrial applications of multifunctional ceramic coatings in aerospace fields.
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ACS Catalysis
·
2025
·
IF 13.1
Shuo Cao,Ying Ma,Wei Chu,Bingsen Zhang,Bo Peng,Yuefeng Liu
Molybdenum carbides have received attention for the reverse water gas shift (RWGS) reaction. Normally, MoCx-based catalysts are synthesized via a high-temperature carbonization of 1100 K, leading to the agglomeration of the active phase. In order to minimize the atomic motion leading to single growth, insertion of heteroatoms has been attempted with the usage of components in the catalyst substrate. The current work applied the self-assembling strategy to prepare a Mo–O–Al composite instead of traditional impregnation before carburization. The dynamic structure evolution and detailed coordination environment of the active phase are investigated by in situ X-ray diffraction, quasi in situ X-ray photoelectron spectroscopy, in situ transmission electron microscopy, and temperature-programmed surface reaction techniques. Our findings reveal that Al doping enables carburization at a lower temperature (200 °C) via the topotactic pathway, yielding α-MoCx (fcc); even at a loading as high as 40 wt %, the catalyst maintains an ultrasmall particle size (1 nm). The optimized catalyst exhibits a RWGS reaction rate of 52.1 μmolCO2·gMo–1·s–1 at 400 °C, representing a 2.5-fold enhancement over bulk β-Mo2C. This work provides a possible solution for maintaining high dispersion at high metal loading for catalyst preparation, specially requiring a high temperature during either synthesis or reaction.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
·
IF 3.9
Ketao Shi,Youbing Zhu,Zhen Xu,Nianming Jiao,Hui Wang
The metal coordination state and the corresponding acid property of zeolite closely relate to its catalytic performance. In this study, DBD-plasma (dielectric barrier discharge-plasma), a low-temperature and energy-efficient external activation method, was proposed to activate the NH4+-type ZSM-5 zeolite and to regulate the Al coordination. It was found that DBD treatment could efficiently decompose NH4+ species at 115 °C, far below that required for calcination (550 °C). Characterizations, including X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), 27Al magic angle spinning nuclear magnetic resonance (27Al MAS NMR), and pyridine-adsorption infrared spectroscopy (Py-IR), revealed that DBD-plasma treatment could inhibit zeolite framework destruction and retain more framework Al and mesoporous structure, thus improving the stability and enhancing the amount of medium-strong Brønsted acid sites. In n-hexane cracking, DBD-activated zeolite exhibited improved conversion and C2–C4 olefin selectivity due to the enhanced monomolecular cracking pathway induced by increased Brønsted acidity, while reducing aromatics and coke formation by suppressing side reactions. This paper presents an alternative method that is more energy-efficient, highly effective, and capable of regulating the metal coordination and acidity of ZSM-5 zeolite.
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JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
RuoKun Jia,PengPeng Wang,XiaoHang Yang,DuMin Li,JianGuo Qiao,TianXiang Li,JiaHui Chen
The rational modulation of the Si/Al ratio within molecular sieves holds utmost significance for augmenting photocatalytic activity. In this context, g-C 3 N 4 /HBeta composite photocatalysts were synthesised via a straightforward in situ thermal polymerisation procedure employing HBeta molecular sieves possessing multiple active sites and diverse Si/Al ratios. Through the variation of Si/Al ratios, the adsorption capacity, photogenerated carrier complexation efficiency, and active site characteristics could be effectively manipulated. The catalyst with the smallest Si/Al ratio (HBeta 25 ) exhibited the highest catalytic activity, with a hydrogen production efficiency of 2.346 mmol g⁻¹. This value was 4.9 times higher than that of pure g-C 3 N 4 , and the degradation efficiency of RhB was 3 times that of pure g-C 3 N 4 . The catalytic proficiency was principally validated by employing a comprehensive suite of techniques, including XPS, BET, SEM, and NH 3 -TPD. Our results demonstrate for the first time the strong potential of zeolite Si/Al ratio to modulate the catalytic activity of photocatalysts.
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Materials Today Communications
·
2025
·
IF 4.5
Xiaojing Liu,Chonghe Xu,Lin Wang,Rongchao Jiang,Liguang Yang,Wenyu Yang,Xuetao Yue
Ceramic fibers have emerged as a promising candidate for advanced thermal insulation applications due to their exceptional thermomechanical properties and chemical resistance. In this work, Mg(-Al/Zr)-Si ceramic fibers were successfully prepared via electrospinning technology using a dual-source precursor strategy, combining magnesium citrate complex and metal chlorides as metal oxides precursors. The crystalline phase formation, thermal decomposition behavior, microstructure, and properties of the fibers were systematically investigated using X-ray diffraction (XRD), thermogravimetric-differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FT–IR), and scanning electron microscopy (SEM). The heterogeneous sol precursor notably influenced the fiber crystallization process and facilitated more gradual thermal decomposition, as evidenced by reduced weight loss rates. Consequently, the Mg(-Al/Zr)-Si ceramic fibers maintained good structural integrity after exposure to 1200 °C. Moreover, the incorporation of aluminum or zirconium enhanced the tensile strengths of fibers (heat treated at 800 °C) to 1.56–1.79 MPa, representing a significant improvement over pure magnesium silicate fibers. Furthermore, the fibers exhibited good thermal insulation performance with low room-temperature thermal conductivity values ranging from 0.0282 to 0.0333 W·m −1 ·K −1 , further highlighting their suitability for high-temperature insulation applications. These findings underscore the significant potential of the developed fibers for use in high temperature thermal management and insulation systems.
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ANALYST
·
2014
·Vol. 139
·期 18
·4613-4619
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IF 3.906
Dan Zhang,Ai Gao,Yang Xu,Xue-Bo Yin,Xi-Wen He,Yu-Kui Zhang
Mesoporous silica nanoparticles (MSNs) were co-doped with Gd3+ and Al3+ and then loaded with Ru(bpy)32+ by ion-exchange to prepare Ru/Gd–Al@MSNs. The as-prepared Ru/Gd–Al@MSNs were applied as contrast agents for in vivo fluorescence and magnetic resonance (MR) dual-modality imaging with a mouse as a model. The effects of Al3+ and MSNs on longitudinal relaxivity (r1) and fluorescence were investigated using a series of Gd-containing silica nanoparticles, including Gd@MSNs, Gd–Al@MSNs, and Ru/Gd–Al@nonporous silica nanoparticles. Co-doping with Al3+ improved the loading of Gd3+; the mesoporous structure improved the water exchange rate. The improvement enhanced the MR imaging efficiency of the Ru/Gd–Al@MSN probe. A higher relaxivity (19.2 mM−1 s−1) was observed compared to that from a commercial contrast agent, Gd-diethylene triamine pentaacetic acid (Gd-DTPA). Importantly, the mesoporous structure provided a large specific surface area for the loading of Ru(bpy)32+ by a simple ion-exchange procedure. Intense red fluorescence was observed from Ru/Gd–Al@MSN probes. The versatility of Ru/Gd–Al@MSNs for dual-modality imaging was demonstrated using in vivo fluorescence imaging and T1-weighted MR imaging with a mouse model. The nanoparticles are biocompatible and may be attractive for clinical applications.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Ji Qi,Mingzheng Liao,Chao Wang,Zhiqiang Jiang,Ying Chen,Bo Liang,Qingbin Song
Indirect hydrogen production routes presented extensive compatibilities for distributed solid oxide fuel cell systems . Catalyst activity directly determines hydrogen production and profoundly affects the power generation . In this work, Ce 1-x M x NiO 3-λ (M = Al, Ti and Ca) were synthesized for hydrogen production from propane partial oxidation (POx). From the results, it indicated that the choice of catalyst compositions could directly affect the microstructure during the preparation process. Also, different Ce 1-x M x NiO 3-λ catalysts displayed distinctive carbon tolerance performances due to the different active particle sizes and surface properties of the catalysts. In general, the synthesized Ce 1-x M x NiO 3-λ catalysts showed higher hydrogen production than a commercial nickel cerium catalyst. From the observation of a SOFC test system powered by injecting the generated H 2 from catalytic propane POx reaction, the obtained power density of CNO–Al displayed an increase of 22.6% compared to the commercial nickel cerium catalyst. It was quite impressive that the equivalent hydrogen (160 ml/min) produced over CNO–Al and the obtained power density (482.6 mW/cm 2 ) of SOFCs were competitive while CNO–Ca presented an excellent stability with a better carbon tolerance performance for the long-term tests. The achievements of this work might offer a novel point of view for developing low-cost catalyst towards indirect hydrogen production for SOFC.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 10
·4031-4039
·
IF 3.269
Xiaofei Song,Jianmin Hao,Yijia Bai,Limin Han,Guangfei Yan,Xu Lian,Jiansheng Liu
Al–Cu–Co alloys containing different intermetallic compound phases were fabricated by the arc-melting method and used as heterogeneous catalysts for solvent-free cyclohexane oxidation by oxygen. The element composition and bulk structure were characterized by ICP-OES, XRD, SEM, TEM and XPS. Co species were the major active component and a small amount of Cu dissolved in the Al13Co4 phase of the alloy exhibited a synergetic effect on improving the catalytic activity. Cu dissolved in the Al13Co4 phase, a decagonal quasicrystal approximant with a special atomic arrangement structure, could increase the electrical conductivity and accelerate electron transfer during the catalytic oxidation of cyclohexane, and thus improved the catalytic activity of the alloy. Among all the alloys prepared in the present work, the Al60Cu5Co35 alloy exhibited the best catalytic performance with a cyclohexane conversion of 6.4% and a total selectivity of 95.2% to cyclohexanol and cyclohexanone. No significant change in the catalytic activity of the Al60Cu5Co35 alloy was observed after five cycles.
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GREEN CHEMISTRY
·
2022
·Vol. 24
·期 22
·8840-8852
·
IF 11.034
Zongyang Liu,Yuan Tan,Jie Li,Xiuli Li,Yan Xiao,Juan Su,Xingkun Chen,Botao Qiao,Yunjie Ding
Aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is a promising alternative route to produce renewable biodegradable plastics, which has stimulated intense interest in recent years. Supported gold catalysts have shown great potential for this reaction, but the selectivity and stability need to be improved. In addition, the requirement for base additives makes the process less effective and sustainable. Herein, highly active and selective Au–Ag bimetallic nanoclusters supported on MgAl-hydrotalcite (HT) were developed for HMF oxidation to FDCA under base-free reaction conditions using molecular oxygen as the oxidant. The presence of small amounts of Ag (0.034–0.065 wt%) in Au25 clusters greatly enhanced the catalytic reaction rates and selectivity for HMF tandem oxidative steps, leading to both high conversion of HMF (>97%) and high yield of FDCA (>95%). Besides, the catalyst stability was also enhanced by the addition of Ag. The characterization results suggested that the substitution of Ag atoms modified the electronic structure of Au while likely maintaining the primary geometry. Thus, a significant synergistic effect could be observed over trace Ag modified Au–Ag bimetallic nanoclusters. The present work provides new insight into the alloying effect, and helps understand highly efficient Au-based catalysts for aerobic oxidation of biomass derived molecules under base-free conditions.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yuhuan Tan,Yiran Yang,Shiyan Li,Zixiong Yao,Shixun Lian,Pengyan Fu,Wenli Zhou
To address issues such as uneven particle size, agglomeration, low luminescence efficiency, and poor stability in the nanosizing of Mn4+-doped fluoride red phosphors, this study combines solid solution engineering and aliovalent charge compensation to prepare high-performance K2LiB1–xB′xF6:Mn4+ (B, B′ = Al, Ga, In) nanoparticles (FNPs). Using an HF-free coprecipitation method for the synthesis of solid-solution matrices, followed by a ligand-assisted reprecipitation step that employs a small amount of HF to dissolve K2MnF6 to rapidly and uniformly incorporate Mn4+ into the matrices, and the particle size is reduced from 33.32 to 16.05 nm with improved dispersibility by adjusting the volume ratio of oleic acid (OA) to oleylamine (OAm) ligands; through the gradual solid solution of Al3+, Ga3+, and In3+, the regulatory mechanism of lattice distortion and local crystal field on luminescence is revealed, with optimal luminescence intensity achieved at specific solid-solution ratios and the emission peak blue-shifted from 636 to 632 nm. Zn2+ codoping for charge compensation enhances the luminescence intensity of the 0.9% Mn4+-doped sample by 120%, with the internal quantum efficiency (IQE) increased to 40.01%, and the fluorescence lifetime extended to 4.11 ms. The FNPs have good thermal stability (56% retention at 150 °C) and moisture resistance (85% retention after 240 h in water). Packaged white light-emitting diode (WLED) exhibits a luminous efficacy of 20.54 lm W–1, and the fluorescent ink enables red–green anticounterfeiting display under UV excitation, providing insights into applications in high-end display and lighting fields, especially micro-LED color conversion layers, WLED packaging, and anticounterfeiting/encryption inks.
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