FUEL PROCESSING TECHNOLOGY
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2018
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IF 3.956
Longfei Tang,Songjiang Chen,Shiwei Wang,Xiuxiang Tao,Huan He,Lei Zheng,Chenyan Ma,Yidong Zhao
The present work investigated the feasibility of heterocyclic sulfur (HS) removal for coal utilizing potassium tert-butoxide and hydrosilane system. Changes of sulfur forms with treatment time in Xinyu (XY) coal were determined by XANES . Results showed that reductions of total sulfur and organic sulfur for XY coal were 55% and 53%, respectively. >85% sulfoether and thiophene sulfur were removed after treated for 4 h, suggesting that the HS could be removed to a high extent from coal. However, contents of sulfonate and sulfonic ester increased with treatment time due to the hydrolysis and oxidation of intermediate products containing Si S bands. Furthermore, it indicated that the HS could be removed selectively from coal without destroying the macromolecular structure of coal based on analysis of desulfurization mechanism. These findings suggested that the desulfurization of refractory HS in coal could be obtained using the potassium tert-butoxide/hydrosilane reductive system, which provided a reference for desulfurization of high organic sulfur coal .
研究领域:
能源化学
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煤化工
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环境化学
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应用化学
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清洁燃料技术
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DOI
高影响因子
FUEL
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2019
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IF 5.128
Longfei Tang,Songjiang Chen,Dongjiao Gui,Xiangnan Zhu,Huan He,Xiuxiang Tao
The present work investigated the effect of efficient reduction desulfurization method (potassium tertbutoxide and hydrosilane system) on coal properties. Characteristic changes of high organic sulfur coal were studied utilizing TGA, FTIR and XPS after desulfurization. Results showed that more than 60% organic sulfur was removed, while the calorific value of coal samples decreased slightly and the aromatics in coal macromolecular structure were destroyed little. After treatment, formation of low molecular fragments from aliphatic carbons leaded to the increase of mass loss in TGA. XPS results revealed that some oxygen-containing groups were deoxidized after reduction treatment. The changes of coal properties were mainly attributed to the fracture of branch chain, the reduction of oxidized carbon atoms and side reactions during reduction desulfurization.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
POLYMER
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2025
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IF 4.5
Chenyu Zhao,PengFei Chen,Rongjie Yang,Wenchao Zhang,Jinxian Zhai
Research concerning polymer shear viscosity and the glass transition temperature has traditionally concentrated on parameters such as segmental structure and molecular weight, with comparatively limited attention devoted to the influence of end-group configurations. In this investigation, hydroxyl-terminated ethylene oxide-tetrahydrofuran copolyether (PET-OH) served as the precursor material to synthesize three copolyethers, namely, propargyl ester-terminated (PET-O 2 CC≡CH), propargyl ether-terminated (PET-OCH 2 C≡CH), and azide-terminated (PET-N 3 ), which possess nearly identical main chain architectures, molecular weights, and molecular weight distributions, differing solely in their end-group configurations. Differential scanning calorimetry (DSC) analysis reveals that the glass transition temperatures ( T g ) of these four copolymer ethers decrease progressively in the order: PET-O 2 CC≡CH > PET-OH > PET-OCH 2 C≡CH > PET-N 3 . Correspondingly, the crystallization enthalpy of the tetrahydrofuran microblocks increases gradually at low temperatures. Viscosity measurements and low-field nuclear magnetic resonance investigations demonstrate a consistent correlation between segmental mobility and viscosity, with the zero-shear flow activation energy decreasing accordingly. Variable-temperature infrared spectroscopy indicates the presence of hydrogen bonding among end groups in PET-O 2 CC≡CH, PET-OH, and PET-OCH 2 C≡CH, thus restricting segmental motion; conversely, PET-N 3 displays lower viscosity, enhanced segmental mobility, reduced T g , and increased crystallinity owing to the absence of intermolecular end-group interactions. Density functional theory (DFT) calculations further corroborate that the hydrogen bonding strength at the terminal groups of these three modified copolyethers diminishes in the sequence: PET-CO 2 C≡CH > PET-OH > PET-OCH 2 C≡CH. Moreover, the extent of association exhibits a positive correlation with both segmental mobility and T g . These findings offer new theoretical insights and practical approaches for modulating thermodynamic properties, rheological behavior, and aggregation structures in polymeric materials.
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TALANTA
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2025
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IF 6.1
Shan Wang,Wei-Jing Chen,Li Hua,Zhaoqing Lu
Accurate and rapid on-site detection of cadmium (Ⅱ) ions (Cd 2+ ) in environment is crucial for protecting ecological environment and human health. This study developed an electrochemical sensor for Cd 2+ detection, based on a laser-induced aramid nanofiber (ANF) film for the in-situ generation of three-dimensional porous graphene. This ANF-based graphene, obtained through precise control of two-step laser process using 450 nm laser, exhibits enhanced graphitization, a denser structure, and superior electrochemical properties. On the basic of laser-induced graphene (LIG) technology, the resulting electrochemical sensor demonstrated excellent performance in detecting trace Cd 2+ . The sensor showed a linear detection range of 1.0–100.0 μg L −1 and a detection limit of 0.37 μg L −1 for Cd 2+ (S/N = 3), along with good stability and reproducibility. Furthermore, when applied to the detection of Cd 2+ in actual lake water samples, the sensor exhibited satisfactory recovery rates ranging from 95.21% to 98.24%. These results demonstrate the successful fabrication of a portable, highly sensitive LIG electrochemical sensor based on ANF. The resulting sensor exhibits excellent electrochemical performance, enabling high sensitivity for Cd 2+ detection. Beyond its analytical capabilities, this work signifies a notable advancement in LIG preparation methods using ANF. This innovative approach provides a novel pathway for developing high-performance and on-site detection devices.
研究领域:
环境监测
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电分析化学
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纳米材料
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传感器与生物传感器
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Fengjiao Jiang,Guiyu Chu,Zhuguang Nie,Zhiyue Zhao,Xiaonan Yang,Ru Wang,Xiaoli Guo,Jinqiu Chen,Mingyu Jiang,Shuhua Qi,Hongxia Yan
With the rapid development of intelligent, portable, and wearable electronic devices, flexible electromagnetic interference (EMI) shielding materials with integrated multifunctional performance have gained increasing attention. In this work, the flexible sandwich-structured aramid nanofiber (ANF)/poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)-MXene-ANF/PEDOT:PSS composite film was successfully fabricated through alternating vacuum-assisted filtration and laminated hot pressing. Within this system, PEDOT:PSS played a dual role in enhancing interfacial bonding and regulating electrical conductivity. As an interfacial binder, PEDOT:PSS significantly strengthened the adhesion between the MXene layer and the ANF substrate through strong interfacial interactions. Meanwhile, as a conductive bridge, its conjugated π-π structure facilitated efficient electron transport and carrier migration, markedly improving the overall conductivity of the film. The synergistic interaction between PEDOT:PSS and MXene led to the formation of a continuous and stable conductive network, providing efficient pathways for charge transport and energy dissipation. As a result of this synergistic design, when the mass ratio of PEDOT:PSS to MXene was 1:6, the APM6 composite film exhibited optimal comprehensive performance, with an EMI shielding efficiency (SE) of 52.57 dB, a specific EMI SE of SSE/t of 7904.197 dB·cm 2 ·g −1 , a Joule heating temperature of 110℃ at 2.5 V, a photothermal conversion temperature of 185℃ under 0.6 W/cm 2 laser irradiation, and a tensile strength of 42.75 MPa. These results demonstrated that the composite film possessed excellent EMI shielding and thermal management capabilities, making it a promising candidate for advanced electronic devices, military and aerospace applications.
研究领域:
材料科学
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纳米技术
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电磁干扰屏蔽
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柔性电子学
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热管理
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Shi Li,Xiao Wang,Liang Du,Yian Li,Zuwu Tang,Jiwen Hu,Wei Zhang
Traditional ion-conducting hydrogels rely on water as the ion-transport medium, yet their practical application is hindered by susceptibility to freezing and evaporation. Herein, Inspired by the lipid structure of cell membranes, an aramid fiber (ANF)-reinforced poly(vinyl alcohol) (PVA)-based organic ion-conducting hydrogel membrane (PVA-ANF hydrogel) was fabricated by a collaborative strategy of dynamic cross-linking and hydrogen bonding network with PVA as the substrate, ANF as the reinforcement, and dimethyl sulfoxide (DMSO)/H 2 O as the binary solvent system, respectively. The incorporation of ANFs markedly enhanced mechanical strength and conferred over 99 % UV filtration capability, whereas the DMSO/H₂O system endowed the hydrogel with exceptional freeze resistance, moisture retention, and transparency. The conductivity value of the organic ion-conductive hydrogel was 1.019 S/m, which was able to precisely detect human body motions and small movements such as pulse (the strain sensitivity could reach 0.2 %) when used as a strain sensor. This work enriches the high value-added and multifunctional applications of aramid fibers and provides a novel perspective for the design of advanced strain sensors.
研究领域:
材料科学
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高分子化学
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纳米复合材料
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柔性电子学
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传感器
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2025
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IF 3.6
Lei Xu,Hao Sun,Xuefeng Tan,Dong Li,Gen-Qiang Chen,Xumu Zhang
A series of ferrocene-based chiral multidentate P,P,N,N-ligands were successfully designed and synthesized. They can be directly prepared via a one-step nucleophilic substitution reaction from (S)-1-[(R)-2-(diphenylphosphino)ferrocenyl] ethyl acetate [(SC,RFC)-BPPFOAc]. Their ruthenium complexes were used in the asymmetric hydrogenation of 2-pyridyl ketones under mild conditions, the target chiral 1-aryl- or 1-alkyl-(pyridine-2-yl)methanols were obtained with high yields and excellent enantioselectivities. The synthetic utility of this reaction was demonstrated through its utilization in the preparation of key intermediates for a RAS inhibitor and the antihistamine drug Carbinoxamine.
研究领域:
有机化学
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不对称催化
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药物化学
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配位化学
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DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Yan Zhang,Xiaolong Xie,Song Zhao,Rui Jiang,Wenjing Qi,Lianzhe Hu
Dissolved ammonia and trinitrophenol (TNP) in water represent a critical environmental and safety challenge. Under slightly acidic conditions, these two compounds spontaneously react to form crystalline ammonium picrate—a highly shock-sensitive explosive compound. This poses explosion risks during wastewater transport, treatment, and sludge handling processes. Existing detection methods rely on complex laboratory instrumentation and cannot provide simultaneous, real-time on-site monitoring. Therefore, there is an urgent need for on-site and simultaneous monitoring of these two hazardous substances. Here, we developed an aggregation-induced emission (AIE) active molecule, DVA-4P, functionalized with four pyridine groups. Its highly twisted molecular conformation effectively suppresses π-π stacking and restricts intramolecular motions, resulting in intense solid-state fluorescence with a quantum yield of 41.87 %. This molecular design can fully leverage the dual functionality of pyridine: the protonated form (DVA-4P-H + ) enables “turn-on” fluorescence detection of ammonia, while the neutral form (DVA-4P) facilitates “turn-off” detection of TNP through electron donor-acceptor interactions. Two separate hydrogel tags are therefore prepared: one encapsulated in a PTFE membrane for selective dissolved ammonia detection, and one left unshielded for selective TNP detection. The tags can achieve high sensitivity and selectivity, with detection limits of 0.70 μg/L for ammonia and 66.2 nM for TNP. The recovery rates of both hydrogel tags in lake water exhibited excellent performance with deviations from the standard within 5 %, providing a practical, dual-mode analytical platform for the environmental monitoring and wastewater treatment.
研究领域:
环境监测
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分析化学
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材料科学
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爆炸物安全
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废水处理
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DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
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2026
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IF 14.2
Anping Wang,Zhichun Zhang,Yanju Liu,Jinsong Leng
Lightweight porous aerogels have demonstrated efficient electromagnetic wave absorption performance. Nevertheless, the inherent trade-off between favorable impedance matching at the atmosphere-aerogel interface and strong electromagnetic loss within the aerogel matrix has limited the further improvement of the aerogel's electromagnetic wave absorption performance. In this study, a waxberry-inspired gradient-porous aerogel metamaterial (WGAM) was successfully fabricated via an innovative dot-matrix cooling source ice templating technique. The influences of diverse pore structures and repeating unit sizes on the performance of aerogels were systematically investigated and analyzed. The results reveal that the gradient pore structure in WGAM effectively balances the conflict between interface impedance matching and intrinsic electromagnetic loss, enabling WGAM to achieve an ultrabroad effective absorption bandwidth of 12.3 GHz within the range of 2–18 GHz. Meanwhile, owing to the 3D radial distribution of internal pores, WGAM retains robust electromagnetic wave absorption capacity even when the incident angle of electromagnetic waves is increased from 5° to 30°. Furthermore, WGAM exhibits favorable mechanical, thermal-insulating, and flame-retardant properties, rendering it a promising candidate for electromagnetic protection applications under complex and harsh environmental conditions.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
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IF 12.5
Anping Wang,Zhichun Zhang,Zibo Li,Yanju Liu,Jinsong Leng
A waxberry-like gradient porous aerogel/honeycomb metamaterial (WGPA/H) was fabricated by an innovative dot-matrix cold-source ice-templating technique. • WGPA/H achieves a remarkable RL min of −78.5 dB and an ultrabroad EAB of 12.4 GHz. • WGPA/H maintains robust EMWA performance under oblique incidence angles ranging from 5° to 60°. • WGPA/H exhibits excellent load-bearing capacity and thermostability. Porous aerogels have emerged as promising candidates for lightweight electromagnetic wave absorption (EMWA) materials, yet their practical performance and engineering deployment are severely constrained by three long-standing bottlenecks: the inherent trade-off between interfacial impedance matching and internal electromagnetic dissipation, the strong angular dependence of EMWA performance, and the insufficient mechanical load-bearing capability. Herein, we developed a novel dot-matrix cold-source ice-templating technique in conjunction with honeycomb skeleton reinforcement to fabricate waxberry-like gradient porous aerogel/honeycomb metamaterials (WGPA/H). The influences of critical structural parameters, including aerogel pore structure and honeycomb cell size, were systematically investigated. The optimal WGPA/H delivers an exceptional minimum reflection loss (RL min ) of −78.5 dB and an ultrabroad effective absorption bandwidth (EAB) of 12.4 GHz. More notably, WGPA/H retains a stable ultrabroad EAB at oblique incidence angles from 5° to 60°, demonstrating excellent angle-insensitive EMWA behavior. This outstanding comprehensive EMWA performance is attributed to the synergistic coupling effect between the unique waxberry-like gradient porous structure and the periodic honeycomb array. Furthermore, WGPA/H integrates high thermostability and a compressive strength up to 4.1 MPa, fully satisfying the service requirements of complex high-temperature and high-loading scenarios. The resultant WGPA/H well preserves the intrinsic lightweight characteristic of aerogels, breaks the trade-off between impedance matching and electromagnetic loss, realizes wide-angle EMWA stability, and simultaneously achieves significantly enhanced mechanical load-bearing performance. This work provides a new structural design strategy for multifunctional EMWA devices, facilitating their practical engineering applications. A waxberry-like gradient porous aerogel/honeycomb metamaterial (WGPA/H) was fabricated by an innovative dot-matrix cold-source ice-templating technique, achieving a remarkable minimum reflection loss of −78.5 dB and an ultrabroad effective absorption bandwidth of 12.4 GHz. Furthermore, the WGPA/H maintains robust electromagnetic wave absorption performance under oblique incidence angles ranging from 5° to 60°. Besides, the WGPA/H exhibits excellent load-bearing capacity and thermostability. Download: Download high-res image (185KB) Download: Download full-size image
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yu Zhang,Yuting Jiang,Yunsheng Xu,Pengwu Xu,Wenjun Peng,Weijun Yang,Shuangfei Xiang,Xianming Zhang
Soft iontronic materials are highly desirable for flexible electronics that operate under deformation and temperature fluctuations, yet practical platforms that combine solid state ionic transport, mechanical robustness, and reprocessability while integrating multiple responsive functions remain limited. Here, a series of X-PEG networks is constructed by integrating acylurea based dynamic covalent linkages, semicrystalline poly(ethylene glycol) segments, and a homogeneously dispersed imidazolium ionic liquid phase. This architecture couples dynamic exchange, associative reinforcement, and reversible crystallinity within one matrix, enabling microstructure governed regulation of mechanics and ion transport. A broad mechanical window is achieved across compositions, with high stretchability and useful strength retained at representative formulations, while ionic conduction is maintained in the 10 −3 to 10 −2 mS·cm −1 range. Robust electromechanical coupling is demonstrated by smooth and repeatable resistance outputs under bending and subtle physiological motions, together with stable cycling performance. Rapid thermal following and heat triggered shape regulation are enabled through PEG crystallization and melting coordinated with relaxation of hydrogen bonded hard domains. Notably, heating produces a resistance decrease that supports temperature triggered circuit warning, consistent with thermally driven microphase reconstruction, primarily through the melting of crystalline domains, which improves the effective connectivity of ion-conducting pathways. The networks are melt-reprocessable, and ionic conductivity as well as strain and temperature responsive sensing outputs are largely preserved after repeated hot pressing cycles. This work establishes a recyclable ionic network platform in which dynamic bonding and semicrystalline switching jointly program microstructure and function, offering a practical materials strategy for sustainable soft iontronic devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Wenping Shi,Xiao Yang,Haitao Li,Chunxia Zhao,Jing Zhou,Yuli Xiong,Wen Chen
Covalent organic frameworks (COFs) with tunable redox activity have emerged as promising electrochromic (EC) materials owing to their structural diversity, tunable bandgaps, interlayer π-π electron delocalization and ordered porosity. However, most imine-linked COF-based EC materials suffer from weak interlayer interactions and inefficient charge transport, leading to poor long-term cycling stability. Herein, we present an efficient linkage conversion strategy, where an imine-linked COF (Im-COF) is oxidized to an amide-linked COF (Am-COF), resulting in a significant improvement in the long-term EC cycling stability of COF films. The Am-COF shows 94.6 % retention after 550 cycles, compared to 81.4 % retention after 480 cycles for Im-COF. Such performance disparity is attributed to differences in interlayer interactions, charge separation, and charge transfer efficiency, as confirmed by characterizations and theoretical calculations. Additionally, at 1050 nm, the Am-COF film exhibits a high optical contrast of 87 %, a rapid response time of 0.6/1.1 s (coloration/bleaching), and a high coloration efficiency of 275 cm 2 C −1 . This work highlights linkage engineering as an effective approach to optimize the charge transfer and redox reversibility of COF-based EC materials, providing a viable pathway for their practical application in advanced optoelectronic devices.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）