APPLIED SURFACE SCIENCE
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2025
·
IF 6.9
Xuekun Yang,Fang Chen,Fangrong Qin,Peng Huang,Cheng Du,Yuanxin Jiang,Songjie Deng,Aolin Ding,Yang Gan,Weiliang Wang,Shusheng Pan,Haiming Huang,Shaolin Zhang
Two-dimensional (2D) graphene-like metal oxides are promising for gas sensing due to their high surface area to volume ratio. This study presents an optimized van der Waals stripping method for fabricating ultrathin In 2 O 3 and SnO 2 films and the In 2 O 3 / SnO 2 heterostructure. The heterojunction sensor demonstrated high performance ethanol detection at 100 ppm, with a response value (R a /R g ) of 13.93, rapid response/recovery times (7 s/29 s), and excellent selectivity. Density functional theory (DFT) simulations revealed that the enhanced performance originates from synergistic interfacial effects that promote electron transfer and selective ethanol adsorption. This work provides a scalable strategy for synthesizing 2D heterostructures and demonstrates their potential for developing advanced gas sensors.
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FUEL
·
2025
·
IF 7.5
Teng Chen,Huashuai Gao,Ping Qi,Shizhao Yang,Xin Xu,Jun Ma,Li Guo,Jingpei Cao,Jianqiang Hu
Coking substance in ester aviation lubricating oil has a great effect on the flight safety of aircraft, however its origin and forming mechanism is complicated and controversial. Herein, the coking mechanism of ester lubricating oil is investigated deeply based on the crankcase simulation test and thin film oxidation evaluation. Besides, its structural and compositional change is also detected through in situ thermal infrared spectroscopy and gas chromatography-mass spectrometer analysis. The results reveal that oil film can be detected when the oxidation time extends to 40.31 min during the thin film oxidation test at 613 K. Whereas, the weight of carbonaceous deposits increases obviously until the oxidation time extends to 4 h in thick oil oxidation at 613 K. The thin film oxidation is evidently identified as the origin for the formation of coking substance, and its formation process involves the orderly breakage of C-O and C–C bands, the formation, polymerization and carbonization of RCOO• and peroxides. More importantly, the tribological performance of ester lubricating oil before and after oxidation and the real characteristics of coking substance are also discussed contrastively, which providing a foundation for safely using this type of lubricating oil.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Dan Wang,Yuanmin Gong,Meiting Yan,Jiaqi Chen,Xueping Tao,Yang Zhou,Yan Ma,Li Rao,Panpan Chen,Qifeng Fu
Carbon dots (CDs) hold great potential for chromatographic separations. However, their application in chromatographic stationary phases has been limited by two major synthetic challenges: (1) insufficient control over surface chemoselectivity caused by impurity co-adsorption, and (2) structural heterogeneity arising from uncontrolled solvothermal byproducts. To address these limitations, we developed a self-polymerization-driven strategy to synthesize high-purity hydrophobic CDs from 8-amino-2-naphthol (8N2OH) and 2,3-dihydroxynaphthalene (DHN). These CDs were incorporated into organic polymer monoliths via in situ copolymerization, yielding novel 8N2OH-CDs and DHN-CDs hybrid monolithic stationary phases for reversed-phase capillary liquid chromatography. The synthesized CDs were thoroughly characterized, with high purity confirmed by proton nuclear magnetic resonance. The resulting monolithic columns exhibited high permeability and uniformity, as demonstrated by field emission scanning electron microscopy, attributed to the excellent dispersion of the CDs. The chromatographic performance was evaluated using nine types of neutral, alkaline, and acidic compounds, as well as Tanaka standard test mixtures. Compared to unmodified columns, the CD-modified monoliths showed significantly enhanced retention strength and selectivity, supported by Tanaka tests revealing multifactorial retention mechanisms. This work demonstrates the potential of high-purity hydrophobic CDs as versatile modifiers for high-performance chromatographic stationary phases.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Xinbo Wang,Pengcheng Ma,Cong Yu,Junjie Bian,Xianglong Meng
Oil shale is a promising unconventional energy source whose processed oil products exhibit a H/C ratio comparable to that of crude oil. This study introduced a purely organic acid-base bifunctional porous material, HCP-BBA-S, and conducted a comprehensive investigation of its catalytic performance in the hydrothermal pyrolysis of oil shale under near-critical water conditions. Upon incorporation of the HCP-BBA-S catalyst, shale oil yield increased by 4.61–19.22 %, accompanied by a shift in oil composition towards lower carbon numbers and lower boiling points. Oxygen content in the products decreased significantly, improving oil quality and calorific value. Under optimized conditions, shale oil yield reached 41.85 %, with an H/C atomic ratio of 1.8 and a calorific value of 41.42 MJ/kg. These results highlight HCP-BBA-S as a highly effective catalyst for enhancing both the yield and quality of shale oil, offering a sustainable approach to unconventional energy resource utilization.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2025
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IF 2.9
Yu Chen,Xueqing Zhang,Chenyang Wang,Zhuojia Shi,Xihou Wang,Jiayi Dong,Yanlong Wang,Minghui Feng
All-solid-state lithium-ion batteries (ASSLIBs) are anticipated to be the next generation of high-performance lithium batteries due to their enhanced safety and high energy density. However, the widespread application of ASSLIBs will lead to a significant increase in spent batteries, resulting in environmental pollution and resource depletion. Therefore, the development of environmentally friendly recycling methods for ASSLIBs is both urgent and critical. Low-melting mixture solvents (LoMMSs) are proposed by Professor Yu's research group at Tsinghua University in 2023 to facilitate the advancement of green solvents and green chemistry. Here, we utilized LoMMSs to leach metals from solid-state electrolytes (SSEs) of ASSILBs and apply the 55 anti-solvents method to recover metal ions from leachate. Results show that the leaching efficiency of Li is up to 92.5 % at the mild temperature of 80 oC within 24 h. The high Li leaching efficiency is ascribed to the coordination interaction. Furthermore, the Li leaching efficiency in large-scale applications shows minimal deviation from the optimal efficiency. This research provides valuable insights into the development of efficient, green, and mild recycling methods for SSEs in ASSLIBs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
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IF 7.7
Huai Wang,Zhenyu Yuan,Jingfeng Li,Renze Zhang,Fanli Meng
Xylene is not only a carcinogenic gas, but also one of indoor pollution gases. Therefore, it is indispensable to develop a xylene gas sensor with fast response and high sensitivity. In this paper, 5 wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt gas sensitive material was prepared by integrating the excellent properties of reduced graphene oxide (rGO) and noble metal Pt. In addition, the microstructure, elemental composition, phase and crystal structure of 5 wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt nanocomposites were characterized. The nanostructure of Pt-modified Fe 2 (MoO 4 ) 3 nano-hollow spheres compounded on rGO was successfully prepared. The gas sensitive experiment results showed that 5 wt%rGO-Fe 2 (MoO 4 ) 3 -1 wt%Pt had better gas sensitive performance than Fe 2 (MoO 4 ) 3 (FMO), FMO-1 wt%Pt and 5 wt%rGO-FMO. At the optimum working temperature (175℃), the 5 wt%rGO-FMO-1 wt%Pt sensor had a maximum response value to xylene, and could detect 500 ppb xylene. In addition, the 5 wt%rGO-FMO-1 wt%Pt nanocomposite showed a rapid response and recovery process to xylene. Moreover, the gas sensitivity mechanism and enhancement of gas sensitivity of 5 wt%rGO-FMO-1 wt%Pt to xylene were systematically analyzed. The 5 wt%rGO-FMO-1 wt%Pt gas sensor prepared provided a new reference for the detection of xylene.
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Nanoscale
·
2015
·Vol. 7
·期 27
·11720-11726
·
IF 7.394
Juan Zheng,Yeru Liang,Shuqin Liu,Yajuan Ding,Yong Shen,Tiangang Luan,Fang Zhu,Ruifen Jiang,Dingcai Wu,Gangfeng Ouyang
Development of facile and effective methods for fabrication of high-performance solid phase microextraction (SPME) fibres remains a great challenge. Herein, a new class of ordered mesoporous polymers (OMPs) in situ coated on a stainless steel wire were successfully developed and utilized as a highly sensitive and stable SPME fibre for the first time. Because of the highly ordered mesoporous structure of its OMP coating, the π–π interactions and the dispersion forces, the OMP-coated SPME fibre exhibited much better extraction properties as compared to the commercial PDMS fibre. The findings could provide a new benchmark for preparing well-defined porous materials for the SPME application.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Qingsong Luo,Yu Wan,Zhenxing Wang,Shuang Gao,Yan Chen,Changhao Feng
In the field of environmental monitoring, metal oxide semiconductor (MOS)-based gas sensors demonstrate significant advantages in detecting volatile organic compounds (VOCs) in ambient air. Gas sensors based on Yttrium-doped Zinc Ferrite nanofibers (Y-doped ZFO NFs) are fabricated via a conventional electrospinning method, with varying molar ratios of Y/Zn (0 at%, 2 at%, 4 at%, and 6 at%). Here, the doping of rare earth element Y significantly enhances the gas sensing performances. The structural and morphological information of both pristine ZFO and Y-doped ZFO NFs have been characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and Transmission electron microscope (TEM). Compared with pure ZFO, the 4 at% Y-doped ZFO (S3) exhibits a 4.46-fold higher response (R a /R g = 43.1) to 100 ppm n-butanol at 150℃ with a fast response time of 11 s. Additionally, the Y-doped ZFO NFs gas sensors exhibit outstanding selectivity, remarkable long-term stability, and a low limit of detection (LOD) attributed to their small grain size, porous and rough morphology, abundant oxygen vacancies, and the formation of n-n heterojunctions.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qing-Shuai Zhang,Yu-Le Wang,Li Yue,Yu-Dong Shan,Song-Hai Wu,Yong Liu,Xu Han
Although selective oxidation of benzene to phenol (SOBP) by H2O2 is an important chemical process, overoxidation of benzene by the produced nonselective •OH during the activation of H2O2 inevitably reduces the oxidation selectivity. We, therefore, attempt to mediate the oxidation selectively by using electrophilic KHCO3 in the oxidation system. In this study, Mo–Cu/NC has been successfully synthesized via ball-milling bimetallic Mo–Cu and N-doped carbon, which exhibits high reactivity in SOBP by H2O2 and KHCO3 with a desirable phenol yield of 25.1% and selectivity of 100%. A series of characterizations and DFT calculations reveal that the reaction between H2O2 and KHCO3 produces HCO4–, which is then moderately activated on Mo1Cu2/NC via the nonradical pathway with the formation of Mo-(η2-O2) peroxo. Meanwhile, Ov at Mo1Cu2/NC facilitates the adsorption of benzene, which is then selectively oxidized by Mo-(η2-O2) peroxo to phenol via the oxygen atom transfer pathway. This study provides new insights on the importance of Mo-(η2-O2) peroxo mediated by H2O2–KHCO3 in selective oxidation of aromatic C–H bond via the nonradical pathway.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yu Chen,Zhuojia Shi,Yuqing Zhang,Yaxue Shen,Zheng Li,Yanlong Wang,Minghui Feng,Qi Liu,Xiaojie Zhao
One hundred low-melting mixture solvents (LoMMSs) are utilized to systematically investigate the impact of acid–base regulation on the leaching efficiency of all-solid-state electrolytes. Results show that the acidity of LoMMSs is positively correlated with the Li leaching efficiency in the all-solid-state electrolytes aluminum-doped lithium lanthanum zirconium oxide and lithium lanthanum zirconium tantalum oxide (LLZTO); however, there is a two-piece linear fitting tendency between the acidity of LoMMSs and La leaching efficiency in the LLZTO. Furthermore, the impact of factors such as the temperature, time, and liquid-to-solid ratio on the dissolution of all-solid-state electrolytes by LoMMSs is also investigated. The leaching efficiencies of LoMMSs for recovering Li and Zr from the all-solid-state electrolytes are 99.24 and 83.74%, respectively. When LoMMSs and the all-solid-state electrolytes are scaled up 100 times to simulate industrial applications, the leaching efficiency of Li decreases only slightly (from 94.81 to 94.70%).
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiayi Qu,Yujun Guo,Xingtai Chen,Xiaoning Wang,Davoud Dastan,Xi-Tao Yin,Xiaoguang Ma
Dy 2 O 3 -CdS nanomaterials was firstly prepared by a one-step hydrothermal method for the rapid detection of n-butanol. In comparison with the sensor solely based on CdS, the integrated gas sensitivity performance of the sensor S 2 (containing 10 mol % Dy 2 O 3 ) for n-butanol was significantly improved, with a response value of up to 130, 3.25 times higher than that of the pristine CdS for 100 ppm n-butanol gas at an optimal operating temperature of 200 °C, this represents a substantial enhancement in the sensitivity of n-butanol detection, outperforming many existing sensing materials. Secondly, the sensor not only demonstrates excellent selectivity and long-term stability towards n-butanol but also enables highly precise detection within the wide concentration range of 5-300 ppm, Additionally, it possesses a fast response/recovery time of 25/18 s, significantly improving the detection efficiency. After a sequence of characterization utilizing XRD (X-ray diffraction), SEM (scanning electron microscope), TEM (transmission electron microscope), XPS (X-Ray photoelectron spectroscopy), the study reveals that the superior gas-sensing performance is attributed to the formation of n-n type heterojunctions, the interconnection of CdS nanomicrospheres by Dy 2 O 3 nanorods that facilitates gas transport, and the unique 4f electrons of Dy 2 O 3 . These findings provide new insights into the design of high-performance gas sensors, distinguishing this work from previous studies and making it a valuable contribution to the field of n-butanol detection.
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LANGMUIR
·
2025
·
IF 3.9
Ruoxin Zhang,Hongsheng Lu,Lingyan Wei,Xingyu Lin,Ziteng Yang,Jie Qi,Zheng Zhang
Interfacial self-assembly offers a promising route to fabricate functional materials, yet achieving robust mechanical performance remains challenging. Here, the self-assembly of nonionic surfactant polyoxyethylene monoalkyl ether (AEO-9) at oil–water interfaces was systematically investigated to form a high-strength interfacial gel. During the self-assembly process, the mechanical strength of the interfacial gel progressively increased, reaching a maximum equilibrium value of 4200 Pa after 24 h. Furthermore, significant gradients in the composition, microstructure, and micromechanical properties of the interfacial gel along the sample height were revealed by fluorescence microscopy, small-angle X-ray scattering (SAXS), and atomic force microscopy (AFM). This unique interfacial self-assembly behavior was further studied via dynamic light scattering and molecular simulations. The solubility differences and polar–hydrophobic interactions are the key factors. Directional migration of AEO-9 from the oil phase (low solubility) to the aqueous phase (high solubility), driven by solubility differences, was found to establish a transient interfacial concentration gradient. This gradient facilitated interfacial enrichment of AEO-9, which was subsequently organized into gradient lamellar liquid crystals (LC) through compositional heterogeneity and polar–hydrophobic interactions. The gradient variations in micromechanical properties were correlated with the gradient structural packing. Moreover, the effects of AEO-9 concentration, brine, temperature, and oil type on the gel’s mechanical properties were examined, highlighting their roles in modulating the polar–hydrophobic balance. This study reveals the dual control of solubility-driven migration and interfacial interactions on gradient formation, establishing a framework for the design of high-performance interfacial materials.
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