DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Xiaoxian Hu,Sina Xiong,Juan Yang,Lei Ye,Yuanyuan Zhang,Ting Zeng,Nianjun Yang
Covalent organic frameworks (COFs) have aroused much attention as candidate materials for constructing electrochemical sensors. However, their inherent low conductivities have limited their sensing applications. Here, a novel COF/carbon nanotubes (CNTs) composite is prepared via a straightforward ultrasonic method, incorporating amino-functionalized CNTs (NH 2 -CNTs) into COF composed of 1, 3, 5-benzenetricarboxaldehyde and 1,4-diaminobenzene. The resulting COF/NH 2 -CNTs composite exhibits high specific surface area, improved conductivity, fast electron transfer capability due to the high porosity of COF, the introduction of NH 2 -CNTs, and the conjugate interaction between CNTs and COF. The proposed COF/NH 2 -CNTs-based sensor offers an amplified current toward the electrochemical sensing of o-nitrophenol (o-NP). Notably, the sensor exhibits a wide linear detection range (0.1–100 and 100–1000 μM), a high sensitivity (8.66 and 1.44 μA/(μM cm 2 )), and a very low detection limit (0.03 μM). Moreover, it is successfully applicable in the quantitative analysis of o-NP in lake water samples with satisfactory recoveries (97.0–105.3 %). This work not only demonstrates the viability of COF-based sensors for the trace-level detection of nitrobenzene contaminants but also enriches the variety of COF-based sensing materials.
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2025
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IF 4.7
Zehong Zhu,Qingxin Wu,Xueying Wang,Haiyang Zhang,Jian Li,Yanzhao Dong,Yongsheng Xu,Yunsheng Dai,Jinli Zhang
Here, the spiral mesoporous hydrothermal carbonaceous nanospheres (SMHNs) were designed and fabricated from pentose precursors to enhance gas diffusion in acetylene hydrochlorination. Through the optimization of hydrothermal conditions, the optimized SMCNs-800 material showcased the highest catalytic activity with an acetylene conversion of 77 % under the condition of GHSV (C 2 H 2 ) = 30 h −1 . The structural analysis indicated that the material with helical structure could provide larger pore sizes and abundant defect sites, exposing more active sites. The structure-activity relationship among acid-base properties of the catalyst surface, the adsorption-desorption capacity for the reactants and the catalytic activity jointly demonstrated that pyridine-N and -C=O could provide abundant basic sites for the adsorption and activation of H-Cl, thus accelerating the process of acetylene hydrochlorination reaction.
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2012
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IF 3.903
Manhong Liu,Xinxin Mo,Yanyan Liu,Hailian Xiao,Yu Zhang,Jieying Jing,Vicki L. Colvin,William W. Yu
Colloidal platinum nanoparticles with 2.2 nm were immobilized on γ-iron oxide (γ-Fe 2 O 3 ) powder to make a supported catalyst (Pt/γ-Fe 2 O 3 ) with controlled Pt nanoparticle size and size distribution. This catalyst was used to catalyze the selective hydrogenation of o -chlorobenzene to o -chloroaniline without using any solvent; 99.9% selectivity at 99.95% conversion was achieved.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Zheng Wang,Keizo Nakagawa,Kecheng Guan,Aiwen Zhang,Yasunao Okamoto,Atsushi Matsuoka,Eiji Kamio,Tomohisa Yoshioka,Hideto Matsuyama
s The stability of solvent-resistant nanofiltration (SRNF) membranes, such as integrally skinned asymmetric (ISA) and thin-film composite (TFC) membranes, in polar aprotic solvents must be improved if they are to meet increasingly complex industrial demands. The stability of the former membranes can be improved by forming crosslinked rigid chains, such as polybenzimidazoles and polyimides, but this requires time-consuming treatment processes. Conversely, the latter membranes are easy to fabricate but lack efficient active sites for crosslinking and structural rigidity. Herein, we present a fabrication strategy combining the characteristics of both types of membranes. We first utilize amino-functional porphyrins as polyaromatic units to form rigid polyamide networks by vacuum-assisted interfacial polymerization, simultaneously providing active sites for further crosslinking, which is accomplished by immersion in FeCl 2 /dimethyl sulfoxide (DMSO) solution to directly establish Fe-O-Fe bridges between porphyrin centers to form a stable network. The Fe-O-Fe-bridged porphyrin networks are solvent-stable in DMSO. Furthermore, they achieve outstanding molecular separation (96.2% rejection of methyl orange, 327 Da) and limited molecular-weight-cutoff change (from 360 to 420 Da) during alternating MeOH and DMSO filtration, along with long-term recovery efficiency (> 96.7% over seven days). Thus, our study provides a promising strategy for the facile development and fabrication of efficient, robust SRNF membranes.
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高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2025
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IF 2.9
Haiyang Huang,Yong Zhou,Ling Xie,Bing Li,Wenlong Wang,Xinjuan Liu,Yongli Huang,Chang Q. Sun,Biao Wang
Hydrogels are versatile functional materials with applications in biomedical devices, sensors, and energy systems. However, tailoring their mechanical properties remains a critical challenge for expanding their practical utility. Here, the mechanical properties of poly(vinyl alcohol) (PVA) hydrogels prepared via the freeze–thaw method were effectively tailored through the incorporation of various chloride salts. This study reveals the molecular mechanisms by which salt ions influence the water structure, polymer chain interactions, and freezing behavior to modulate hydrogel performance. Using Raman spectroscopy, X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR), we elucidate how cation-specific effects alter the crystallinity, cross-linking density, and hydrogen bond network in the hydrogels. Hydrogels containing K+ exhibited superior rigidity and toughness due to enhanced crystallinity and optimized water–polymer interactions, while hydrogels of Mg2+ and Ca2+ had much lower modulus and adhesion strength since the divalent ions reduced freezing points resulting in reduced polymer aggregation. These findings provide a molecular-level understanding of the salting effects on hydrogel properties, offering new insights into designing materials with tunable mechanical performance for diverse applications.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Juan Du,Hao Fang,Jialiang Ma,Jing Lin,Shikuo Li,Yu Jiang,Fangzhi Huang
Synergistic photothermal-magnetothermal activation overcomes environmental interference (e.g., cloud cover) that critically limits solar evaporator efficiency, enabling robust all-weather vapor generation. Herein, we demonstrate in-situ synthesis of a covalently integrated Fe₃O₄/hydrogel composite via ice-templating and interfacial covalent bonding engineering. Si-O-Fe bonds anchor KH-570 onto Fe₃O₄, enabling copolymerization of surface-grafted methacryloyloxy groups with acrylamide monomers for covalent network grafting, while programmed gravitational sedimentation yields a hierarchical porous hydrophilic magnetic gel solar interfacial evaporator (MSE) with magnetothermal interface. This architecture reduces evaporation enthalpy, achieving 2.33 kg m −2 h −1 under 1 sun. Significantly, synergistic activation by an alternating magnetic field and 1 sun irradiation boosts the evaporation rate for 3.5 wt% saline water to 2.94 kg m −2 h −1 . This work establishes the magnetothermal-photothermal synergy within the covalently integrated MSE as an effective material design paradigm for all-weather solar desalination.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Kui Liu,Liang Shi,Xueying Wang,Cheng Liu,Jie Li,Yulong Liao,Lichuan Jin,Dainan Zhang,Huaiwu Zhang
Herein, Li + -enriched Li (1+ x )2 ZnTi 3 O 8 ceramics are prepared via the solid-phase methods. As x increases, the unit cell volume gradually increases, while the grain size initially increases and then decreases gradually. The Li (1+0.06)2 ZnTi 3 O 8 ceramics exhibit the best dielectric properties : ε r = 25.92, Q × f = 109534 GHz (@7.37 GHz, which is a 48 % increase compared with the stoichiometric counterpart.), and τ f = −8.21 ppm/°C. The complex chemical bond theory and Raman spectroscopy reveal that Ti-O bonds have a significant effect on the dielectric properties . An optimal Li + enrichment leads to an overall reduction in the distortion of the Li/ZnO 4 tetrahedra, resulting in a reduction in τ f . First-principles calculations demonstrate that a suitable excess of Li + leads to an increase in the band-gap as well as an enhanced electron cloud density in the internal space of the Li1/ZnO 4 tetrahedra, thereby increasing the Q × f . In summary, Li + -enriched Li (1+0.06)2 ZnTi 3 O 8 ceramics are promising for a wide array of applications in microwave communications.
研究领域:
材料科学
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固态物理
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Xin Guo,Zhijia Sun,Hao Ge,Qin Zhao,Tingting Shang,Yang Tian,Xi-Ming Song
Nanocomposites of manganese oxides and carbonaceous materials with strong interfacial connection hold extraordinary potential as high-performance electrode materials for energy storage devices. However, the interfacial interaction between manganese oxides and carbon has not been sufficient elucidated despite it may affect the chemical composition and morphology of the electrode materials and thus impact on the electrochemical performance. Herein, through regulating the amount of oxygen-containing functional groups on the surface of multi-walled carbon nanotubes (MWCNTs), a series of MnO x /MWCNTs nanocomposites with different compositions and morphologies are successfully synthesized. The Mn–O–C bonds, which can act as an ultrafast electron transfer path, are formed in the MnO x /MWCNTs nanocomposites. The influence of the amount and type of oxygen-containing functional groups in MWCNTs on the formation of Mn–O–C bonds, the composition and morphology of the nanocomposites is revealed clearly. The nanocomposite with the highest number of Mn–O–C bonds in the prepared MnO x /MWCNTs, which feature a structure with the binary manganese oxides (38% MnO 2 and 62% Mn 3 O 4 ) nanosheets growing vertically and uniformly on the oxidized MWCNTs, give the best electrochemical properties with high capacity (1353.2 mAh g −1 at 0.1 A g −1 ), outstanding rate capability (384.9 mAh g −1 at 20 A g −1 ), and durable long-term cyclability (1000 cycles with 70% retention at 2 A g −1 ). The quantitative kinetic analysis indicates that over 60% of the charge storage is pseudocapacitive. The distinct interfacial design strategy presents a new route to synthesis transition metal oxides/carbon hybrids with efficient energy storage and conversion.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Hongda Li,Honggao Deng,Shaonan Gu,Chenpu Li,Boran Tao,Shumin Chen,Xiong He,Guofu Wang,Wenfeng Zhang,Haixin Chang
The “FeMo cofactors” in biological nitrogenase play a decisive role in nitrogen reduction. Herein, a novel bionic Fe/Mo bimetallene was applied in photocatalytic nitrogen reduction. The surface coating Fe/Mo bimetallene of Bi 2 Mo 0.3 W 0.7 O 6 (BMWO) nanocrystals could effectively promote the separation and transportation of photogenerated carriers by multi–electron redox reactions and deliver 2.8 times longer photo–carrier lifetime. Consequently, the nitrogen fixation activity of Fe/Mo bimetallene–coated BMWO nanocrystal photocatalyst was obviously enhanced (218.93 μmol g –1 h −1 ), which was about 4.8 times that of unmodified BMWO nanocrystals. This work provides a novel approach to design bionic Fe/Mo bimetallene–modified inorganic semiconductor photocatalysts for nitrogen reduction.
研究领域:
材料科学
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催化化学
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环境科学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2025
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IF 3.2
Zhang Wenlong,Wang Bin,Xu Yuxin,Chen Xiao,Zhang Kuibao,Hao Yan
To enhance the thermal stability of SiO 2 aerogels at high temperature, this study proposes a method involving the incorporation of MgAl 2 O 4 nanoparticles into SiO 2 aerogels to improve their high-temperature stability. By comparing the performance of MgAl 2 O 4 -SiO 2 aerogel with pure SiO 2 aerogels after heat treatment at high temperatures, it is demonstrated that the MgAl 2 O 4 nanoparticles significantly enhances the thermal stability of SiO 2 aerogels at elevated temperatures while almost no effect on thermal conductivity, about 0.0312 and 0.0322 W/(m·K). The MgAl 2 O 4 -SiO 2 aerogels exhibit superior thermal stability and insulation performance compared to pure SiO 2 aerogels at temperatures exceeding 800 ℃. Notably, even after heat treatment at 1100℃, a condition that causes pure SiO 2 aerogels to nearly lose their porous structure, the MgAl 2 O 4 -SiO 2 aerogels retain a specific surface area of 81.95 m 2 /g and thermal conductivity of 0.0584 W/(m·K).
研究领域:
材料科学
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无机化学
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热力学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2012
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IF 1.289
Di Zhao,JianFeng Xu,Lu Wang,JianJia Du,KeDong Dong,CaiFei Wang,XiangDong Liu
Two phosphorylated chitosan derivatives with a similar degree of substitution of about 0.5 were synthesized via either the esterification of chitosan's hydroxyl groups by P 2 O 5 in methanesulfonic acid or the selective incorporation of methylene phosphonic groups on chitosan's amino groups by formaldehyde/H 3 PO 3 in water. The performances of the resulting O -phosphorylated chitosan (OPC) and N -methylene phosphonic chitosan (NMPC) as amphoteric flocculants were assessed in comparison with that of unmodified chitosan. In turbidity removal experiments using kaolin suspensions in water, OPC removed about 90% turbidity, but NMPC only removed 60%. The lower flocculation efficiency of NMPC was attributed to the decreased acid strength of the N -methylene phosphate groups in NMPC. These results revealed that the acidity of the phosphate groups introduced in the modified chitosans is an important factor with regard to the flocculation efficiency, and consequently that O-phosphorylation is more suitable than N-phosphorylation for preparing chitosan-based amphoteric flocculants. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Long Chen,Sijie Su,Peijing Tian,Jian Yuan,Weihong Zheng
Rare earth elements have attracted significant attention due to their unique electronic structure. By doping rare earth ions into oxides, they can be used as spectral conversion materials in fields such as photovoltaic power generation and biological probes. In this paper, the performance of Eu 3+ doped Al 2 O 3 hollow microspheres by sol-gel method was analyzed by SEM, XRD, IR, TG-DSC, and fluorescence spectrometer. Using aluminum isopropoxide (Al(OC 3 H 7 ) 3 ) as raw material, PMMA with a particle size of 150 nm as the template, PMMA/boehmite particles with core-shell structure can be prepared by sol gel method and template method. After adding Eu 3+ and heat treatment, a transition occurred from γ-AlOOH(85 °C)→γ-Al 2 O 3 (600 °C)→θ-Al 2 O 3 (1000 °C)→α-Al 2 O 3 (1200 °C) as the temperature increased, and EuAlO 3 was generated at 1200 °C. Eu 3+ occupied the sites without inversion centers inside the host lattice, and the alumina was an effective matrix for the fluorescent properties of Eu 3+ . Its excitation was caused by the 7 F 0 → 5 L 6 transition, and its luminescence was controlled by the 5 D 0 → 7 F 2 transition, which can convert ultraviolet light into red and orange light. The fluorescence intensity increases with the increase of Eu 3+ content, and no quenching was observed at a doping concentration of 10mol% Eu 3+ .
研究领域:
材料科学
·
光学
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DOI
高影响因子
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