Journal of Coatings Technology and Research
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2025
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IF 2.8
Tang Baoling,He Ziyu
The commonly used dispersants for graphene dispersions reduce the conductivity of the composite. In this work, a dispersant with an amphiphilic structure, CA-g-PANI, has been designed and synthesized. The dispersant grafts citric acid (CA) onto polyaniline via an amide reaction, which gives CA-g-PANI the hydrophilic groups (carboxyl groups) and the benzene ring structures that can be π–π conjugated with graphene, and it can improve the dispersion properties of graphene; CA-g-PANI contains the polyaniline structure, which is electrically conductive and enhances the electrical conductivity of graphene dispersions. The molecular structure and properties of the dispersant were systematically characterized through FTIR spectra, UV absorption spectra, and other methods. The graphene-based composites were prepared by screen printing method, and the dispersibility and resistivity of CA-g-PANI were compared with gum arabic and alkali lignin (natural dispersants). Graphene concentration reached up to 30 mg/mL in the presence of CA-g-PANI at the weight ratio of 1:0.03 (CA-g-PANI: graphene). CA-g-PANI also exhibited good performance for stabilizing graphene (stable for 6 days), with an electrical conductivity of up to 917.43 S/m. In the study, it was shown that CA-g-PANI as a graphene dispersant improved the conductivity of graphene dispersions while enhancing the dispersing properties of graphene.
研究领域:
材料科学
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
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IF 4.5
Xiaoxi Li,Jiajia Li,Dilnur Kurbanjan,Tianhao Yu,Hong Du
Zeolite imidazole frameworks (ZIFs) structures are widely used as an efficient catalyst for metal organic frameworks (MOFs) in electrocatalysis. In this work, the structure of the trimetallic ZIFs sample was rationally designed by the method of doping with Ni 2+ and Zn 2+ . After that, a layer of highly conductive π-π conjugated organic molecules was wrapped on the trimetallic ZIFs sample to form a heterojunction structure of NiZnCo-ZIF@HHTP composite. The activity of oxygen evolution reaction (OER) of NiZnCo-ZIF was improved after it was combined with HHTP. NiZnCo-ZIF@HHTP presents a low overpotential (η ≈ 193 mV @10 mA cm −2 ), a small Tafel slope (97.4 mV dec −1 ) and outstanding stability for OER in 1 M KOH solution. The superior OER performance of NiZnCo-ZIF@HHTP is due to the effect of doping of Ni and Zn to form a trimetallic ZIF material. The synergistic effect of Ni Zn codoped enhances the conductivity of ZIF-67 material. Meanwhile, the π-π conjugation effect of HHTP organic macromolecule can further enhance the electrical conductivity of NiZnCo-ZIF. The result suggests that the co-doping of polymetallic cations and the coating of conducting organic molecules can be vital for modifying ZIFs electrocatalysts. This work provides a meaningful reference value for modifying non-precious metal ZIFs materials in electrocatalysis.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2024
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IF 5.1
Guoming Yuan,Hui Yang,Xiaole Zheng,Kunxin Wang,Zhijun Liu,Yuemiao Zhang,Yanhan Tao,Kun Wu,Peiwei Hong,Jun Shi,Li Yang
In response to the limitations imposed on the microelectronics industry by electronic crosstalk losses and signal delays, as well as the rapid accumulation of heat, intrinsically low dielectric and high thermal conductivity materials are in urgent demand. Here, a self-curable biobased silane precursor (M@KH590) with a biphenyl unit was synthesized. A series of films (magnolol polysiloxane films (MPSOs)) were prepared using simple sol–gel film conversion and annealing and modulated intermolecular forces and molecular structure. The red-shift of the UV–vis absorption indicated that a larger π–π conjugated system was established. As a result, the through-plane thermal conductivity of MPSO-140 was 0.601 W·m–1·K–1, which was more than three times that of the pure polysiloxane material. Meanwhile, MPSO-140 exhibited excellent intrinsic low dielectric properties (Dk = 2.52, Df = 0.000572, and f = 100 MHz). This was mainly attributed to the reduction of highly polar substances and groups as well as the difficulty in polarizing a π–π conjugated system. Based on rigid biphenyl units and high cross-link density, the tensile strength and modulus of MPSO-140 were 17.42 MPa and 2.61 GPa, respectively, showing prominent mechanical properties. In addition, MPSO-140 exhibited excellent water resistance (water contact angle and 72 h water absorption of 104.8° and 0.19%, respectively) and electrical insulation, showing great potential for practical applications. The study broadened the way toward overcoming the contradiction between low dielectric and high thermal conductivity by simultaneously introducing large free volume and modulating the intermolecular forces and molecular structure in a simple and effective way.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
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2021
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IF 3.605
Ruzhen Cheng,Run Zou,Long He,Lei Liu,Chang Cao,Xinyuan Li,Xuhong Guo,Jun Xu
The precipitation and deposition of asphaltenes often cause great troubles to the recovery and transportation of crude oil. Adding polymer inhibitors is an effective approach to prevent asphaltenes from clogging. In this study, maleic anhydride-co-octadecene copolymers with imidazolyl, phenyl, and pyridyl pendants were synthesized. The inhibition behaviors of two extracted asphaltenes in the presence of these copolymers were investigated, which were also identified by the rheological tests of the heavy crude oil sample. The chemical structure of both asphaltenes was analyzed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), elemental analysis, and time-of-flight (TOF) spectrometry. Both asphaltenes A and B have a high aromaticity and low H/C. However, asphaltene B has a much higher aromaticity and polarity than that of asphaltene A. Ultraviolet–visible spectroscopy, turbidity meter, and dynamic light scattering (DLS) were employed to determine the precipitation behaviors of asphaltenes in the absence and presence of copolymers. The influence of intrinsic properties of asphaltenes, polymer concentration, and aromatic group grafting ratio on asphaltene precipitation were also compared. It is found that the initial precipitation point (IPP) of both asphaltenes is increased most by the copolymer containing 2-aminopyridine (PMO-2-P), while the copolymer containing N-(3-aminopropyl)imidazole (PMO-I) shows the worst inhibition performance. It is because that pyridine group has a stronger adsorption capacity with asphaltene than the imidazole group. The effect of various functional groups in copolymers on inhibiting asphaltene precipitation conforms to the following sequence: 2-aminopyridine > aniline > 4-aminopyridine > N-(3-aminopropyl)imidazole. It is also found that high polymer concentration and grafting ratio are beneficial to inhibit the asphaltene precipitation. As a result of the π–π conjugation and hydrogen-bonding attractions between the aromatic groups in the copolymers and the asphaltenes, the polymers can be stably adsorbed onto the surface of the asphaltenes and prevent their aggregation.
研究领域:
石油化学
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胶体化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Shucheng Liu,Ming Li,Yi Tang,Xiaogang Wen
A novel Fe 3 O 4 /MgAl-TA LDH (FTLDH) nanocomposites with tartrate anion-intercalation is successfully synthesized by a one-step hydrothermal process. The synthesized FTLDH are flower-like hollow microspheres composed of nanosheets with an average thickness of 25 nm. The specific surface area of the calcined FTLDH (FTLDH-C) greatly increases to 120 m 2 /g, exposing more adsorption sites which can bind the target adsorbates. The adsorption capacities of obtained hollow microspheres towards Congo Red (CR), Malachite Green (MG) and Neutral Red (NR) can reach 1520, 819 and 929 mg/g at room temperature, 2590, 1041 and 1153 mg/g at 45 °C, receptively. The excellent dye adsorption performance can be attributed to the unique hollow and porous microstructure, trumpet-shaped through channels in shell layer and high specific surface area. The dye adsorption process on FTLDH-C hollow microsphere is in accordance with Langmuir isotherm and pseudo-second-order kinetic models. The adsorption is mainly driven by electrostatic attraction (CR) and the hydrogen bonds/π-π conjugation etc. chemical interaction (CR, MG, NR etc.) between dye molecules and LDH nanoflakes. Due to the presence of magnetic Fe 3 O 4 nanoparticles in the nanocomposites, the used adsorbent can be easily recollected with magnetic field. This study puts forward a new way to develop high-performance adsorbent via microstrucure-design and magnetic functionalization.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2025
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IF 4.8
Yi Zhou,Wenfeng Zhao
Designing a low-cost and efficient photocatalytic system to produce high-valuable carbonates from the cycloaddition of CO 2 by using clean and renewable sunlight as the driving force shows great research potential. Here, a commercially available 4,4''-diamino-p-terphenyl (DT) was directly employed to promote the photocatalytic cycloaddition of CO 2 and various epoxides under visible light irradiation. As high as 95 % yield of target carbonate was obtained using blue LED (>450 nm) as a light source for 6 h under solvent-free/atmospheric CO 2 /room temperature conditions. Even under irradiation of natural light, a good yield of 68 % carbonate can also be achieved under ambient conditions. Moreover, in situ EPR and a series of controlled experiments were conducted to investigate the plausible photocatalytic mechanism, demonstrating that amino-containing DT with both π-π and p-π conjugated structure provides abundant basic sites and photogenerated electrons/holes as active sites for CO 2 activation and ring opening of epoxides at the same time.
研究领域:
化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
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
Yanhan Tao,Hui Yang,Guoming Yuan,Zhijun Liu,Bo Yang,Kun Wu,Jun Shi
Epoxy resins face a dual challenge in advanced miniaturized and high-power devices: the need for efficient thermal management to ensure operational stability, alongside the inherent difficulty in recycling their covalently cross-linked networks at end-of-life. To address these issues, two epoxy monomers (H-LM and F-LM) containing imine bonds and biphenyl-based liquid crystalline mesogens were synthesized. X-ray diffraction analysis (XRD) showed crystallite sizes of 23.64 nm (H-LM) and 30.93 nm (F-LM), with relative crystallinities of 39 % and 41 %, respectively. Cured epoxy resins (H-LMD, F-LMD) exhibited intrinsic high thermal conductivity due to enhanced phonon transport via π-π conjugation between imine bonds and biphenyl units in the crosslinked network. H-LMD achieved in-plane ( λ ‖) and through-plane ( λ ⊥ ) thermal conductivities of 0.614 W/(m·K) and 0.299 W/(m·K), respectively, surpassing conventional epoxy resins ( λ ‖ = 0.23–0.38 W/(m·K)). Fluorination enhanced molecular rigidity and structural order in F-LMD, yielding higher λ ‖ (0 . 718 W/(m·K)) and λ ⊥ (0 . 42 W/(m·K)), along with a tensile strength of 99.67 MPa, fracture strain of 6.33 %, and hydrophobicity (water contact angle: 110.95 °). Dynamic imine bonds enabled efficient resin recycling via amine exchange, Fourier transform infrared spectroscopy (FTIR) confirmed. Interestingly, although the recycled resins (H-LMD-1 and F-LMD-1) exhibited a decrease in in-plane thermal conductivity by 36.7 % and 10.5 %, respectively, compared to their pristine counterparts, their tensile strength was significantly enhanced by 23.5 % and 8.4 %. This work provides an effective strategy to concurrently tackle the coupled challenges of low intrinsic thermal conductivity and poor recyclability in conventional thermosetting epoxy resins.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
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IF 7.3
Xin Song,Chunfeng Li,Lei Le,Zhihao Zhang,Mingli Liu
Waterborne polyurethanes (WPUs) have emerged as the preferred option for researchers aiming to replace solvent/emulsion-based resins in carbon fibers (CFs) coatings, owing to their superior adhesion, eco-friendliness, and cost-effectiveness. However, conventional polyether/polyester-based WPU coatings often exhibit insufficient mechanical properties, thermal stability, and weathering resistance. To address these limitations, a diol (PHBA-D1000) containing dynamically reversible imine bonds was synthesized via Schiff base formation between 4-hydroxybenzaldehyde (PHBA) and Jeffamine D1000. Ethoxylated bisphenol A (BPE) and 1,4-bis(2-hydroxyethoxy) benzene (HQEE) were copolymerized proportionally as co-monomers, using PHBA-D1000 as the soft-segment backbone to produce BPE/HQEE-modified WPUs (EWPUs). These EWPUs incorporate π-π conjugated benzene stacking, aromatic ether, biphenyl, carbamate, polyurea, imide, carboxylic acid, and carbonyl groups within their molecular structure. The synergistic effects of these co-monomers improved the overall properties of EWPUs, yielding coatings with better thermal stability (T5% at 269.5 °C), higher tensile strength (46.1 MPa), and greater adhesion (18.7 kPa), showcasing improvements of 26.7 %, 95.3 %, and 21.9 %, respectively. Utilizing EWPUs as sizing coatings significantly enhanced the reactivity, wettability, and mechanical properties of CFs. These coatings introduced functional groups and rigid chains onto the fiber surface, effectively repairing CF surface defects and increasing surface roughness. The surface energy and monofilament tensile strength of EWPU-coated CF reached 59.3 mN/m and 6.216 GPa, respectively, corresponding to improvements of 66.1 % and 24.5 % compared to unsized CF. EWPUs demonstrate outstanding overall performance and notable functional characteristics, highlighting their significant potential for diverse applications and further development.
研究领域:
高分子材料科学
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复合材料工程
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表面功能化
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纳米涂层技术
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胶体与界面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Bingtong Chen,Yingying Cao,Jing Wang,Yiwei Zhu,Jian Kang,Hui Wang
To ensure the safety of drugs in clinical use and avoid side effects, the impurity content should be strictly controlled. Artemisitene (ARE) has quite similar structure to that of the antimalarial artemisinin, and thus is difficult to be removed from the target drug. The traditional column chromatography method to purify artemisinin has low separation efficiency and needs lots of organic solvents. In this work, functional ionic liquid (IL), 1-(trimethoxysilyl) benzene-3-vinylimidazolium chloride, modified silica materials were synthesized. Composition of the functional materials were characterized by energy dispersive spectroscopy, FT-IR, and X-ray photoelectron spectroscopy. It was indicated that the designed ionic liquid was successfully grafted onto SiO 2 . Adsorption capacity of the prepared ionic liquid-based material for artemisinin and artemisitene was evaluated, and it was demonstrated that adsorption of ARE by the functional material was a quick process, and the adsorption kinetics followed the Elovich Model. This kind of IL@SiO 2 material exhibited excellent performance in selective separation of artemisitene from artemisinin. Mechanism exploration by spectroscopic analysis revealed that π-π conjugated interactions between the unsaturated bond (the C=C bond and aromatic ring) in the ionic liquid and artemisitene enhanced the molecular recognition capability of IL@SiO 2 for ARE, resulting in selective separation of these two structurally analogues.
研究领域:
药物化学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xuan Zhang,Tianxiang Li,Jialu Zhang,Qin Wu,Fengshan Zhang,Nan Nan Xia
Nanoplastics (NPs) are emerging contaminants that need to be urgently removed from water. In this study, a compression-resistant polyurethane foam modified by lignin is used to remove NPs from aqueous media via two mechanisms: (1) macropore transport in the polyurethane foam and (2) electrostatic, hydrogen bond and π–π conjugation interactions between NPs and the lignin-polyurethane foam. The roles of these two mechanisms change with the variation of the lignin content. When the lignin content was 2%, the resulting PU–Ln (2%) foam had an excellent adsorption capacity for NPs at pH 9. The results of the adsorption kinetics indicated that the adsorption of NPs on the polyurethane foam fitted the pseudo-second-order kinetic model, indicating that the adsorption process mainly proceeded via chemical adsorption. The adsorption isotherms at different temperatures and the calculation of thermodynamic parameters showed that the adsorption of NPs conformed to the Langmuir isotherm model, and the maximum adsorption capacity of PU–Ln (2%) for NPs was calculated to be 38.06 mg/g. Even after five adsorption–desorption cycles, the adsorbents showed high NPs removal efficiency. Therefore, the lignin-modified polyurethane foam has a promising potential for application in NPs removal.
研究领域:
环境科学
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材料科学
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化学工程
·
水污染控制
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Cai,Jincheng Liu,Zewei Liao,Yijun Luo,Xiaoyan Xiang,Bingjie Li,Wenxin Yang,Yanxiong Fang
Overcoming limited charge separation and inefficient solar utilization remains critical for photocatalytic hydrogen evolution. This study addresses these challenges by constructing an organic-inorganic composite photocatalyst by integrating CdZnS nanoparticles with perylene-3,4,9,10-tetracarboxylic diimide (PDI) nanosheets via controlled assembly. Optimizing the PDI content yielded a remarkable hydrogen evolution rate of 7.09 mmol·g −1 ·h −1 under visible light irradiation, representing a 2.3-fold enhancement over pristine CdZnS. This superior photocatalytic performance originates from synergistic effects: exceptional light harvesting by PDI supramolecular structures, enhanced charge mobility via π-π conjugation pathways, and efficient charge separation with high redox potential preservation enabled by the S-scheme heterojunction mechanism. This work establishes a strategic paradigm for developing high-efficiency heterojunction photocatalysts through rational interface engineering.
研究领域:
光催化
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材料科学
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纳米技术
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能量转换
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
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IF 6.911
Yalan Hu,Yueru Shi,Yuefan Liu,Yixin Kuang,Suxin Zhou,Luyi Chen,Sai Ouyang,Ningbo Zhou,Juan Zheng,Gangfeng Ouyang
Aromatic esters have been widely used in daily life with non-ignorable dangers, such as plasticizer , flavor , and preservative. Their wide applications and corresponding hazards caused by overuse have promoted the rapid development of sensitively analytical method for effective regulation. However, the variety makes it challenging for broad-spectrum and simultaneous extraction of diverse aromatic esters from the highly complex cosmetic samples. To our delight, a covalent organic framework, named DaTp (1, 3, 5-triformylphloroglucinol-2, 6-diaminoanthracene), possessing high specific surface, excellently thermochemical stability, and abundant electron-rich heteroatoms , has been synthesized and fabricated as a competitive solid phase microextraction coating for extracting the trace analytes with diverse polarity, through the hydrophobic interaction, π-π conjugation and hydrogen bond . Herein, this self-made SPME fiber has been further coupled with gas chromatography-tandem mass spectrometry (GC-MS) to determine the multi-polar aromatic esters in cosmetics packaged with plastic. This developed analytical method showed wide liner ranges, low limits of detection, good repeatability and reproducibility. Finally, the aromatic esters in four cosmetic samples were quantified precisely with satisfactory recoveries (80.7%–118%).
研究领域:
分析化学
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材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）