SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
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
·
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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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
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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
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
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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PHYSICA SCRIPTA
·
2024
·Vol. 100
·期 1
·015948
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IF 2.6
Fucheng Yu,Zengguang Huang,Jinghong Zhang,Sihua Zhong
Cu3BiS3 has been considered as an attractive photovoltaic material due to its suitable bandgap, excellent photoelectric properties, abundant component elements and low toxicity. However, most of the reported Cu3BiS3 solar cells contain toxic components in other functioning layers such as CdS in electron-transport layers (ETLs). In this study, the Cu3BiS3 thin films were prepared by spin-coating method. We find that the CuCl concentration in precursor solutions has influences on both the optical bandgap and grain size of the Cu3BiS3 thin films, thus affecting the performance of solar cells. The optimal CuCl concentration is 0.91 M. Besides, Al doped TiO2 (ATO) and MoOx films are employed as ETLs and hole-transport layers (HTLs) respectively, constructing a totally non-toxic thin film solar cell. Moreover, it is demonstrated that the ratio (RAl:Ti) of Al source (Aluminum nitrate nonahydrate) to Ti source [Titanium diisopropoxide bis(acetylacetonate)] in the precursor solution of ATO and the thickness of MoOx have significant influences on solar cells. Moderate Al doping in ATO, e.g. RAl:Ti=1:50, can produce oxygen vacancies and accelerate the interfacial charge transfer, thus resulting in the increased short-circuit current density and fill factor. With the optimized Cu3BiS3 absorber, ETL and HTL, improved cell performances are observed comparted to the spin-coated Cu3BiS3 counterparts with CdS as ETLs in literature.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
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IF 3.141
Yuan Cai,Xiaofeng Xu,Hu Wang,Lei Wang,Lulu Chen,Rui Li,Jing Ding,Hui Wan,Guofeng Guan
Production of alternative, clean aviation fuel from biomass synthesis gas via Fischer–Tropsch (FT) synthesis has attracted much attention. In this paper, Al-SBA-15 supported cobalt catalysts with different Al/Si ratios were successfully prepared for the production of aviation fuel by FT synthesis. The physical and acidic properties of the Co/Al-SBA-15 catalysts were characterized by XRF, XRD, N2 adsorption–desorption, TEM, H2-TPR, 27Al NMR, NH3-TPD, and Py-FTIR. The formation of long-chain hydrocarbons was inhibited by the ordered mesoporous structure. Fischer–Tropsch activity and selectivity were demonstrated to be affected by the acidity of the Al-SBA-15 supports. The selectivity turned to lighter iso-paraffin products. Co-based catalyst with Al/Si ratio of 0.01 exhibited the highest selectivity (52.4%) for aviation fuel (C8–C18 products) and much higher ratio of iso-paraffin/normal-paraffin (iso/n) (20.2%). This study might provide useful information for the selective production of aviation fuel via FT synthesis.
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MATERIALS CHARACTERIZATION
·
2017
·
IF 2.714
Baisong Guo,Xinming Zhang,Xi Cen,Xinhua Wang,Min Song,Song Ni,Jianhong Yi,Tao Shen,Yong Du
By hybridizing carbon nanotubes (CNTs) into SiC reinforced Al matrix composites , a novel composite was fabricated to achieve excellent mechanical properties and low coefficient of thermal expansion simultaneously. The study demonstrated that the CNTs can help to acquire the uniform dispersion of SiC particles in the Al matrix, because of their interaction during ball milling and hot rolling processes. In addition, the results revealed that such design optimizes both the mechanical and thermal properties, due to homogeneous microstructure as well as tight and uniform interfaces induced by the addition of CNTs. Strengthening mechanism and Sideridis's model were used to discuss the effects of the CNTs on the mechanical and thermal properties. This study opens up an unexplored avenue for simultaneous improvement of the mechanical and thermal properties of metal matrix composites .
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ENERGY & FUELS
·
2024
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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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CORROSION SCIENCE
·
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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Surfaces and Interfaces
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2024
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IF 5.7
Ningning Zhou,Huihui Zheng,Mengen Hu,Rui Liu,Guangchao Qin,Yilin Lu,Haibin Tang,Zhulin Huang
In this study, highly uniform 3D Al nanoneedle arrays (AlNNAs) decorated with Ag nanopines are synthesized by anodization of Al foil with prior nanoimprinting and subsequent electrodeposition method, demonstrating remarkable surface-enhanced Raman scattering (SERS) property. The AlNNAs possess a highly ordered periodicity of 1 μm and nanoneedle height of 800 nm, making it an optimal supporting matrix to host Ag-NPs as SERS substrate. Such well-ordered Ag@AlNNAs SERS substrate with precisely electrodeposited Ag nanopines generate high density SERS host spots and abundant sites to adsorb target molecules. As a result, Ag@AlNNAs exhibit high sensitivity for rhodamine 6 G down to 10 –13 M and good signal reproducibility with a relative standard deviation of 7.2 %, as well as an average enhancement factor of 4.23 × 10 9 . For practical detection of pollutants, 10 –8 M adenine , 10 –12 M bisphenol in water, and melamine (10 –7 M) in opaque milk are clearly identified by using the Ag@AlNNAs sensor. This study opens a bright way to fabricate SERS substrate with a good balance of sensitivity, reproducibility and cost, indicating promising potential for environmental monitoring and food safety.
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高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Lina Sun,Ping Ning,Jie Yang,Xin Song,Kai Li
This study used metal oxide-modified metal-organic frameworks to examine H 2 S catalytic oxidation selectivity. The findings revealed that the oxidation mechanisms and products differed between Fe 2 O 3 /UiO-66 and Al 2 O 3 /UiO-66. The dithionates were intermediate products of H 2 S oxidation on Al 2 O 3 /UiO-66, whereas the bisulfates were intermediate products on Fe 2 O 3 /UiO-66. Fe 2 O 3 /UiO-66 showed stronger surface oxidation activity than Al 2 O 3 /UiO-66. The formation of sulfate/SO 2 was primarily attributable to surface oxygen, whereas elemental sulfur was primarily related to lattice oxygen. The product generation processes of H 2 S on Fe 2 O 3 /UiO-66 and Al 2 O 3 /UiO-66 surfaces were as follows: H 2 S → HSO 4 2− → SO 2 → S for Fe 2 O 3 /UiO-66, while H 2 S → S 2 O 4 2− → SO 2 for Al 2 O 3 /UiO-66. H 2 O and surface oxygen have the potential to alter H 2 S adsorption on the catalyst surface. For Fe 2 O 3 , the conversion of H 2 S to SO 2 involves both an oxidation process and a reduction process. For Al 2 O 3 , the conversion of H 2 S to SO 2 includes two oxidation processes. Due to the oxidation step of S 2 O 4 2− limiting the generation of SO 2 , the reduction process of SO 2 was also hindered, which in turn restricted the production of S over Al 2 O 3 . Fe 2 O 3 can achieve the oxidation and removal of H 2 S at lower reaction temperatures, while also creating elemental S.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2024
·Vol. 49
·期 5
·e202300285
·
IF 1.7
Mi Li,Zhongxuan Han,Lin Jiang,Guozhong Xu
Nano-thermite has become a subject of significant interest in the composite energetic materials field due to its high energy release rate. To cater to diverse engineering needs, thermite formulations are often customized to fulfill specific criteria. This study investigates the potential of metal nickel (Ni) as an additive to modify nano-thermite formulations, selected for its optimal calorific values and chemical reactivity. The base materials, nano-aluminum (Al) and iron oxide (Fe 2 O 3 ), are blended with varying mass ratios of Ni (1 %, 3 %, 5 %, 7 %, 9 %) using the wet ball milling method. Pre-reaction and post-reaction morphological and compositional alterations in the resultant thermite samples are scrutinized through SEM and XRD characterization tests. Moreover, DSC analysis and combustion experiments were conducted to examine the pyrolysis and combustion behaviors of the evaluated samples. The results reveal a reduced exothermic peak on the DSC curves with the introduction of Ni, making the liquid-solid ( L - S ) phase reaction more challenging compared to the Al/Fe 2 O 3 thermite. Intriguingly, Ni addition progressively decreases the combustion temperature of thermites as the Ni's mass ratio increases, with a peak efficiency at 7 % in the perforation tests on stainless-steel plates. This research further reveals that the thermite reaction mechanism is a combined consequence of the “pre-ignition-fusion” and “fusion-diffusion” mechanisms. These insights can provide valuable guidance for designing thermite formulations for potential applications in storage, management, and pyrotechnic cutting areas.
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