CERAMICS INTERNATIONAL
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2016
·
IF 2.758
Kun Tong,Rong Li,Jingting Zhu,Heliang Yao,Huaijuan Zhou,Xianzhe Zeng,Shidong Ji,Ping Jin
VO 2 /Al-O core-shell structure (V/AO) was synthesized by a facile method and its application for thermochromic film on smart window was investigated. Comparisons of thermochromic properties and stabilities in different environments between VO 2 and annealed V/AO nanoparticles were made. As a result, VO 2 nanoparticle was easily oxidized and lost thermochromic property. In contrast, with the protection provided by Al-O-based shell, the VO 2 core remained stable at a high temperature (350 °C in air) and in H 2 O 2 solution. Especially, thermochromic films made by annealed V/AO nanoparticles almost kept thermochromic performance in damp heating environment (T=60 °C, RH=90%) for 20 days while VO 2 films lost their thermochromic properties after 3 days. Besides, the degradation progress of VO 2 and V/AO nanoparticles in damp heating environment was also explored. Results indicate that Al-O-based shell provides a good protection for the VO 2 core originated from the compact structure of shell, which effectively prevents oxygen and water from eroding VO 2 . In summary, the VO 2 nanoparticles coated with Al-O-based shell exhibit a great potential in the application of smart window.
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RSC Advances
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2016
·Vol. 6
·期 6
·5100-5110
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IF 3.289
Yinghao Wu,Wenjie Zhao,Wurong Wang,Wenjie Sui
Aluminum alloys with novel binary anti-corrosion structures on the surface showing superhydrophobic properties were fabricated via chemical etching, anodic oxidation and chemical modification. Surface morphologies and chemical elements of the as-prepared films were investigated by Fourier transform infrared spectrometer, scanning electron microscopy and confocal laser scanning microscope. Surface wettability was investigated by the contact angle meter. Manipulation of surface morphology by anodic oxidation current density and the influence of surface chemical modification on the wettability were investigated. The anti-corrosion properties of the as-prepared films were characterized using an electrochemistry workstation. The results showed that surface water contact angle could reach 156° after chemical modification when the current density of anodic oxidation was 5 A dm−2. The corrosion potential (Ecorr) was positively increased from −1189 mV for bare Al alloys to −304 mV for the samples anodized at 5 A dm−2. The synergetic effect between the protective properties of air trapped in a low adhesion superhydrophobic surface and good barrier properties of the barrier layer of anodic oxidation film was remarkably enhanced the corrosion resistance of aluminum alloys. Influences of the anodic oxidation current density and the self-assembled films on the anti-corrosion performance were discussed in detail.
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BULLETIN OF THE KOREAN CHEMICAL SOCIETY
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2016
·Vol. 37
·期 11
·1827-1830
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IF 0.793
Yanjun Yin,Xueming Li
In this study, an energetic material was prepared by depositing nano-Al on CuO arrays via electrophoretic deposition (EPD), which offers a feasible route for nano-Al integration. The morphology and structure of the CuO arrays and Al/CuO composites were characterized by scanning electron microscopy and X-ray diffraction. The CuO arrays were homogenously salix leaf-like structure with a width of ~150 to 200 nm. The energy density of Al/CuO composites was approximate to 1454.5 J/g by integrating the differential scanning calorimetry (DSC) plot and the combustion performance was recorded by a high-speed camera. Moreover, the combustion flames were violent and the whole reaction process only lasted 72.2 ms, indicating that the energy of the Al/CuO nanothermite can be released effectively.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2014
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IF 2.063
Ran-ran Shan,Liang-guo Yan,Yan-ming Yang,Kun Yang,Shu-jun Yu,Hai-qin Yu,Bao-cun Zhu,Bin Du
The Mg–Al-CO 3 -LDH with Mg 2+ /Al 3+ molar ratio of 2 was prepared via coprecipitation method at constant pH of 9–10 and used to remove three red dyes by batch adsorption method. The results showed the Mg–Al-LDH were well crystallized and can adsorb the red dyes effectively. The optimal adsorbent dosage and contact time were 1.0 g and 60 min, respectively. Adsorbed amount hardly changed when pH < 10. The adsorption kinetics fit the pseudo-second order kinetic models well and isotherms correspond to Langmuir model strictly. All the relevant mechanisms were studied and manifested as anion exchange and also electrostatic attraction for CR.
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CORROSION SCIENCE
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2024
·
IF 7.4
Shuai Zhang,Yinlong Ma,Sixu Zhao,Wenhao Dai,Baochang Liu
A modified cerium seal PEO pretreatment was developed on 2A14 alloy and combined with an epoxy coating (EP) to form a duplex coating system. The PEO coating was effectively sealed by cerium hydroxides and oxides , and also acted as a controlled release vessel for the cerium salt corrosion inhibitor , and significantly improved the adhesive strength of the EP. The results of electrochemical tests and immersion experiments show that the coating system pretreated with the modified cerium seal PEO exhibits excellent long-term corrosion resistance and active protection. This is attributed to the physical barrier of insoluble cerium-based compounds and sensitive pH-responsive deposition.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2024
·Vol. 149
·期 22
·12697-12708
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IF 3
Sun Mengxia,Liao Xueqin,Liu Jianzhong
Using Al–Mg alloy instead of pure aluminum can improve the agglomeration and combustion characteristics of composite propellants. In this experiment, the effects of oxygen concentration and pressure on the ignition and combustion performance of Al–Mg binary alloy (with a magnesium mass content of 20%) and Al–Mg alloy mixed with ammonium perchlorate (AP) were investigated using a laser ignition test bench. The thermogravimetric results showed that the melting of aluminum, magnesium and intermetallic phases in the alloy powder occurred under argon, producing four heat absorption peaks. Magnesium evaporates at about 580 °C. In air, only one endothermic peak was observed, with oxidation occurring at approximately 510 °C. During the oxidation process, the intermetallic phase decomposes. Laser ignition tests showed that the alloy mainly undergoes gas-phase combustion, exhibiting phenomena such as gas emission, particle fragmentation, and micro-explosions. The introduction of AP promotes ignition and combustion of the alloy, resulting in more intense gas-phase reactions. Both increased pressure and oxygen concentration will promote alloy combustion. There are two reaction zones in the particles during combustion. Filamentary solids were observed in the combustion products of the AP-AM samples, which were primarily the products of the reaction of magnesium with O and Cl.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Wenlu Zhang,Mengzhe Bao,Mengyao Chen,Wenbin Li,Chong He,Weilin Xu
High-performance TiO 2 nanotube materials are highly demanded across various fields spanning thermal insulation, catalyst supports, filtration, and so on. However, the practical applications of hollow nanotubes are constrained by the low efficiency and uncontrollable structural properties. Herein, mass production of flexible and high catalytic hollow Al/Si@TiO 2 nanotubes were realized. Through solution blow spinning and atomic layer deposition processes, TiO 2 coated Al/Si@PAN core–shell nanofiber intermediate product was obtained with high efficiency. Hollow tubular structure of Al/Si@TiO 2 nanotubes with wall thicknesses among 150–350 nm was successfully replicated by sacrificing PAN core fibers template through a high-temperature pyrolysis process. Organic polysiloxane and polyalumina were employed as the internal supports to enhance the toughness and elasticity of the hollow Al/Si@TiO 2 nanotube products. Diameters of hollow Al/Si@TiO 2 nanotubes can be controlled ranging from 0.5-2.5 μm through adjusting the flow rate among 10–30 mL/h and air pressure among 0.2–0.4 MPa. Pyrolyzed hollow Al/Si@TiO 2 nanotubes exhibited remarkable elasticity with the compression strain of over 60 %. Hollow Al/Si@TiO 2 nanotubes demonstrated a methylene blue degradation efficiency of reached 61 % and outstanding reusability over multiple cycles, which held promising potential for utilization in high efficiency purification and remediation of water pollutants.
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INORGANIC CHEMISTRY
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2024
·
IF 4.3
Yuhao Che,Wenhui Li,Chunqi Wang,Xuemin Zhang,Zilei Guo,Aziz Bakhtiyarovich Ibragimov,Junkuo Gao
The development of materials with superior thermal insulation and flame retardancy is critical for industrial applications and daily life. Metal–organic framework (MOF)@poly(vinyl alcohol) (PVA) (MOF@PVA) aerogel composites have demonstrated remarkable thermal insulation and flame retardancy properties. In this work, MIL-53(Al) was directly mixed with PVA and formed by freeze-drying, and the influence of the pore structure on the thermal insulation and flame retardancy properties of the materials was investigated. The incorporated MIL-53(Al) nanoparticles introduced abundant micro- and mesopores, enhancing the complexity of the pore structure and improving the thermal insulation and flame retardancy properties of the aerogels. The directionally freeze-cast aerogel achieved a thermal conductivity of 0.040 W·mK–1, and maintained excellent thermal insulation ability even at 220 °C. Furthermore, the aerogel exhibited nonflammable and self-extinguishing characteristics. This environmentally friendly manufacturing method provides new ideas for the design of MOF-based composites, thereby expanding their application areas.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Le Zhong,Yuxiao Feng,Zichen Wang,Tian Tian,Yali Bi,Jiandong Cui
Enzymatic synthesis of flavor esters is crucial for applications in food, beverage, and cosmetics industries. However, the poor activity and stability of free lipase hinder these reaction. Inspired by the concept of lipase interface activation, MIL-53(Al)-NH 2 was modified with alkyl acid anhydrides of varying chain lengths to tailor its hydrophobicity, and Candida Rugosa lipase (CRL) was subsequently immobilized on this surface to achieve efficient interface activation. The resulting CRL@MIL-53(Al)-AM11 exhibited 3.5 times higher activity than the unmodified CRL@MIL-53(Al)-NH 2 . Moreover, CRL@MIL-53(Al)-AM11 enabled one-step purification of crude CRL via selective adsorption. It also showed enhanced storage and thermal stability as well as higher resistance to protease degradation and denaturants than free CRL. CRL@MIL-53(Al)-AM11 retained 75 % of its initial activity after 30 min treatment at 55 °C, whereas the free CRL retained only 41 %. After 11 days of storage, CRL@MIL-53(Al)-AM11 maintained 70 % of its initial activity, in contrast to 36 % for the free lipase. Notably, CRL@MIL-53(Al)-AM11 achieved a 97 % conversion rate in the esterification synthesis of the flavoring substance (butyl butyrate) within 24 h and retained over 40 % conversion after five consecutive cycles. Therefore, this strategy offers a feasible approach for constructing high-performance immobilized lipases for flavor ester synthesis.
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PubMed
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2024
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IF 6.1
Yubo Zhang,Junrui Huang,Bohan Wang,Jiajing Liu,Shuang Xie,Tingju Li,Tongmin Wang
Uniform distribution of low-dimensional nano-carbon materials (NCMs) for the optimal enhancement effects is always a major issue of metal matrix composites (MMCs). In this study, aminopropyl triethoxysilane (APS) was introduced to synthesize Al@GO powders in an optimized process, by which, the uniform coating of GO on Al powders and the chemical bonding between them were obtained with the GO content up to 1.0 %. After hot pressed sintering using these powders, the GO/Al composite has a nacre-like structure that Al grains are lamellar with reduced graphene oxide (RGO) on the grain boundaries. By the application of APS with the optimized process, the relative density of 1.0 % RGO/Al composite increased from 99.2 % (without APS) to 99.7 % (with APS), indicating that the aggregation of RGO and the concomitant hole defects were effectively eliminated. Therefore, the average tensile strength of the 0.5 % and 1.0 % RGO/Al composites reached 243.6 MPa and 292.4 MPa, respectively, which were 105.9 % and 147.4 % improved compared with those of pure Al. This work has provided a new strategy to fabricate NCMs/Al composite with uniform dispersion of NCMs.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Hu Laigang,Wu Wenhao,Hu Min,Jiang Ling,Lin Daohui,Wu Jian,Yang Kun
Double-walled metal-organic frameworks (MOFs), synthesized using Zn and Co, are potential porous materials for trace benzene adsorption. Aluminum is with low-toxicity and abundance in nature, in comparison with Zn and Co. Therefore, a double-walled Al-based MOF, named as ZJU-520(Al), with large microporous specific surface area of 2235 m 2 g –1 , pore size distribution in the range of 9.26–12.99 Å and excellent chemical stability, was synthesized. ZJU-520(Al) is consisted by helical chain of AlO 6 clusters and 4,6-Di(4-carboxyphenyl)pyrimidine ligands. Trace benzene adsorption of ZJU-520(Al) is up to 5.98 mmol g –1 at 298 K and P/P 0 = 0.01. Adsorbed benzene molecules are trapped on two types of sites. One (site I) is near the AlO 6 clusters, another (site II) is near the N atom of ligands, using Grand Canonical Monte Carlo simulations. ZJU-520(Al) can effectively separate trace benzene from mixed vapor flow of benzene and cyclohexane, due to the adsorption affinity of benzene higher than that of cyclohexane. Therefore, ZJU-520(Al) is a potential adsorbent for trace benzene adsorption and benzene/cyclohexane separation.
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PubMed
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ENERGY & FUELS
·
2024
·
IF 5.2
Yifan Wang,Kaifeng Lu,Yuan Zhao,Lingjun Zhu,Shurong Wang
Converting renewable biomass into liquid fuels and value-added chemicals has emerged as a pivotal technology, driving the transformation of the energy landscape. Efficiently transforming the cellulose components of biomass into the crucial liquid fuel precursor levulinic acid holds profound significance. The principal objective of this study is to fabricate a temperature-responsive catalyst based on Al-doped silicotungstic acid, which is intended for converting glucose into levulinic acid. By exploiting the interaction between choline chloride and silicotungstic acid, which exhibits a notable capacity for high proton migration, we successfully synthesized a stable acid catalyst with responsive properties to temperature changes. Through precise adjustments of Al3+ concentration, we engineered a collection of Lewis/Brønsted composite catalysts capable of responding to temperature variations. A comprehensive analysis of the catalyst’s structure and acidity was conducted using various techniques including FTIR, XRD, TEM, and Py-IR. These methods revealed crucial insights into the crystalline architecture, surface morphology, and distribution of acidic domains, providing a solid foundation for a deeper understanding of the catalytic reaction mechanism. Through the meticulous optimization of key reaction parameters, including Al3+ loading, solvent composition, reaction temperature, and reaction duration, the ChAl2/3HSiW12O40 catalyst achieved its pinnacle of efficiency at 150 °C over an 8 h period. This resulted in the remarkable outcome of complete glucose conversion, yielding an impressive 62.01% of levulinic acid. Additionally, an evaluation of the catalyst’s recyclability was carried out, demonstrating its commendable hydrothermal stability and ability for repetitive usage without any reduction in catalytic efficiency.
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