INTERNATIONAL JOURNAL OF THERMAL SCIENCES
·
2014
·
IF 2.563
Yuan-Xiang Fu,Zhuo-Xian He,Dong-Chuan Mo,Shu-Shen Lu
Graphene-epoxy thermal conductive adhesive was obtained using few-layer graphene sheets as additives which were fabricated by a re-expansion and exfoliation method. The experimental results show that graphene sheets can effectively enhance the thermal conductivity of epoxy matrix , with 4.01 W m −1 K −1 for the maximum filling loading of weight 10.10%, which is enhanced by more than 22 times of the pure epoxy resin , about 2.2 times higher than that of the same resin with the maximum weight 16.81% filled with graphite nanoflakes, and approximately 2.4 times higher than that of the same resin with the maximum weight 44.3% filled with the natural graphite powder .
研究领域:
材料科学
·
热传导工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2015
·Vol. 308
·期 3
·1095-1102
·
IF 1.034
Wang Zhengshang,Wang Yun,Liao Jiali,Yang Yuanyou,Liu Ning,Tang Jun
Three types of graphene sheets (GS) were decorated by chemical oxidation, electrolysis and ball-milling, respectively. These oxidized samples were characterized using SEM, XRD, Raman, FT-IR and XPS, and then were employed to enrich U(VI) from aqueous solutions as a function of pH, contact time and initial concentration of U(VI). These results displayed that the quantities and types of oxygen-functional groups were extremely different through these methods, which highly determined the adsorption capacity of graphene oxide to uranium. This work may provide some helpful information to optimize these fabrication processes and improve the adsorption ability of GS to uranium.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Xueli Zhang,Yan Sun,Wei Su,Xueyuan Wang
As a new kind of adsorbent, graphene sheets (GS) possess large surface areas and excellent adsorption properties. To investigate the adsorption equilibria of C1–C4 from natural gas on GS and fit the isotherms by the Langmuir–Freundlich equation. GS were synthesized with a specific surface area of 805 m2/g and a specific pore volume of 1.03 cm3/g. The adsorption isotherms were measured using a volumetric method at five different temperatures between 263.15 and 303.15 K and at pressures of 0–6 MPa for CH4, 0–1.6 MPa for C2H6, 0–0.3 MPa for C3H8, and 0–0.05 MPa for C4H10. It was shown that, for all four hydrocarbons, the amount of adsorption decreased gradually as the temperature increased. The isotherms were described well by the Langmuir–Freundlich equation. The isosteric heat of adsorption values decreased in the order C4H10 > C3H8 > C2H6 > CH4 which was consistent with those of the extreme heats of adsorption. This suggests that the adsorption capacities of C1–C4 on GS decreased in the order C4H10 > C3H8 > C2H6 > CH4.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SN Applied Sciences
·
2018
·Vol. 1
·期 1
·1-9
·
IF 0
Wei Q.,Wufuer A.,Wang M.,Wang Y.,Dai L.
Three-dimensional graphene (3DG) sponge has attracted increasing attention because it combines the unique properties of cellular materials and the excellent performance of graphene. Preparation of 3DG sponge depends mainly on the self-assembly of graphene oxide sheets. In the case of using uniform large graphene oxide and ultralarge graphene oxide sheets, the nematic liquid crystals (LCs) phases are formed at low concentration. After chemical reduction, the LCs of GO solution are converted to 3DG sponges with a high degree of orientation, offering a new methodology to regulate the controlled large GO sheets. The orientation of GO solution can be inherited by 3DG sponge, making the sponge to have a large-scale ordered network structure. The 3D elastic graphene sponges have low density and good elasticity, promising for the applications in strain sensing, shock damping, and energy cushioning. Our work explores a novel strategy for organizing the ordered alignment of controlled large GO sheets and exploring the relationship between the microstructures and mechanical properties of 3DG sponge.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Haiyun Zhai,Zhenping Liu,Zuanguang Chen,Zhixian Liang,Zihao Su,Shumei Wang
A novel electrochemical sensor was designed to determine clenbuterol by using a new hybrid nanomaterials of water-dispersible sulfonated graphene sheets (SGSs) and oxygen-functionalized multi-walled carbon nanotubes (MWCNTs-COOH) modified glass carbon electrode (GCE). The π–π stacking interaction between SGSs and MWCNTs-COOH was verified by UV–vis spectroscopy, fourier transform-infrared spectroscopy and scanning electron microscopy. The anodic peak current (Ipa) of clenbuterol at the GCE modified with SGSs/MWCNTs-COOH was much higher than those at the bare GCE, SGSs/GCE and MWCNTs-COOH/GCE due to the synergistic effect of the modified nanomaterials. Differential pulse voltammetry disclosed a good linear relationship between Ipa and concentrations of clenbuterol (0.01–5.0 μM), with the detection limit of 4.6 nM. Finally, the modified electrode was successfully used to determine clenbuterol in liver samples.
研究领域:
分析化学
·
纳米材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Haochen Yuan,Sherif Araby,Kangbo Zhao,Mohammed Salah,Yin Yu,Tianqing Liu,Qingshi Meng
In response to the global focus on environmental preservation and sustainable practices, developing nanocomposites featuring recyclable and healing properties is indispensable for high-performance and long-life structures. This study presents a facile approach to develop a recyclable and thermally-induced healing polyurea (PU)/graphene platelet (GNP) nanocomposites with high mechanical properties. A straightforward synthesis method was employed using isophorone diamine (IPDA) as chain extender with rigid cyclic structure. GNPs were modified with IPDA before adding into PU, showing remarkable enhancements in mechanical performance. At 0.10 wt.% GNPs, PU nanocomposites exhibited the maximum mechanical properties, with modified GNPs ( M- GNPs) significantly outperforming pristine GNPs. Specifically, the tensile strength of PU increased by 41.3 % with M- GNPs, compared to only 12 % with pristine GNPs, underscoring the critical role of modifying the reinforcing phase. Furthermore, the nanocomposites demonstrated outstanding healing capabilities, achieving 89 % healing efficiency after 24 h at 120 °C. In addition, PU/ M- GNP nanocomposites showed exceptional resistance to acidic and alkaline environments in comparison to neat PU. The study not only exemplifies developing high-strength and environmentally friendly materials but also holds promise for diverse applications, including aerospace, vibration damping, and protective coatings.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2021
·
IF 3.785
Dong Feng,Siyu Hao,Qi Liu,Yuanzhi Zhu,Tianbiao Zeng
Among germanium-based composites, GeS 2 has attracted increasing concerns owning to its high theoretical capacity when applied to lithium-ion batteries (LiBs) as anode materials . Nevertheless, the intrinsic poor conductivity and volume expansion issues of GeS 2 hindered its practical applications. Herein, we report a ball milling-assisted solid-state reaction approach to simultaneously smash GeS 2 particles and exfoliate graphite powder . In this way, the GeS 2 was pulverized and well anchored in exfoliated graphite sheets. When used as anode electrode for LiBs, the graphite sheets not only served as electron transfer layers, but also helped alleviating the volume shrinkage/expansion of GeS 2 during the repeated lithiation/de-lithiation processes. The well designed GeS 2 -coated graphite sheet structure endow the hybrid GeS 2 /graphite (GeS 2 /C) anode with high reversible capacity. For instance, the GeS 2 /C anode powder delivered specific capacities of 823.3 and 395.3 mAh g -1 at 100 th and 200 th cycle under 0.1 and 1.5 A g -1 , respectively, these values were higher than that of the neat GeS 2 anode (corresponding to 453.1 and 81.0 mAh g -1 ). This study offers a facile and economical strategy to settle the drawbacks of GeS 2 for LiBs anode, which shed some light on guiding the preparation of various types of graphite-supported electrodes with improved integral electrochemical performance .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Guanjun Liu,Fan Yang,Yujiao Bai,Chuang Han,Wenbo Liu,Xingkui Guo,Peipei Wang,Rongguo Wang
The low bonding strength between the thermoplastic liners and the metal bosses can easily lead to hydrogen leakage, which is one of the most important challenges for the development of type IV hydrogen storage tanks. Herein, a method incorporating graphene flakes (GFs) into polymer matrix was applied to enhance the adhesion between polyethylene (PE) and stainless steel. The adhesive bonding tests showed that the bonding strength of PE/0.5 wt% GFs composites to stainless steel was improved by an order of magnitude compared to pure PE. Contact angle tests , digital images and SEM observations were used to explore the mechanism of adhesion enhancement. The characterization test results showed that the increase in bonding strength is attributed to the mechanical interlocking caused by GFs and the strong interaction between GFs and stainless steel. This method will provide important guidance for the manufacture of the plastic liners of the Type Ⅳ tanks.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Rui Yin,Yubai Zhang,Wen Zhao,Xiaoshuai Huang,Xiaomin Li,Lei Qian
Graphene platelets/aluminium nitride (GPLs/AlN) metacomposites with double percolation property of thermal and electrical conductivity were successfully fabricated by spark plasma sintering . Microstructures and phase composition of the GPLs/AlN metacomposites were investigated by field emission scanning electron microscopy , X-ray diffraction and Raman spectroscopy . With increase of the GPLs contents, the double percolation property of thermal (19.27 wt% GPL) and electrical conductivity (19.03 wt% GPL) was found. Moreover, the negative permittivity behavior was also observed when the GPLs content reached 19.50 wt%, which was attributed to the formation of continuous GPLs networks. Finally, the equivalent circuit models were used to analyze the negative permittivity behavior. As the reactance ( Z′′ ) converted from negative to positive, the inductors were introduced into the equivalent circuit models, and the GPLs/AlN metacomposites went through the capacitive-inductive transition with the increasing GPLs content, corresponding to the negative permittivity behavior.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Zheng Su,Hua Wang,Konghu Tian,Weiqi Huang,Yulan Guo,Jing He,Xingyou Tian
High thermal conductive filler (graphite flake) reinforced polymer composites have obtained a growing attention in the microelectronic industry. In order to overcome the obstacles in surface modification, in this study, dopamine chemistry was used to achieve the facile modification of graphite flake via forming a polydopamine (PDA) shell on the surface in a solvent-free aqueous condition. The strong π-π interaction between the hexagonal structural graphite flake and aromatic dopamine molecules ensured the effective modification. The PDA coating on graphite flake enhanced the compatibility between the filler and the flexible cycloaliphatic epoxy resin (CER) matrix via hydrogen bond , and promoted the epoxy curing process by forming covalent bond . Under the assistance of gravity, the PDA@graphite flake stacked along the horizontal direction in the polymer matrix . The procedure of filler alignment and mechanism of thermal decomposition were investigated by XRD measurement and thermodynamic/kinetics analysis, respectively. The dynamic mechanical analysis (DMA) was also used to investigate the relationship between microstructure and performance. Due to the combination of surface modification and alignment of PDA@graphite flake, the prepared CER/PDA@graphite has higher in-plane thermal conductivity . In addition, excellent adhesion property and thermal stability demonstrated that the CER/PDA@graphite composites was a good candidate as thermal interface material (TIMs), which could be applied in the thermal management areas. The procedure was environment friendly, easy operation, and suitable for the practical application in large scale.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Ji-Shi Wei,Jie Chen,Hui Ding,Peng Zhang,Yong-Gang Wang,Huan-Ming Xiong
A series of polymer dots/graphene sheets composites with high densities are prepared and tested for supercapacitors . Polymer dots (PDs) are synthesized by one-step method at room temperature . They can effectively increase surface areas of the composites (almost 10 times), and the functional groups from PDs produce high pseudocapacitance , so that the samples exhibit high specific capacitances (e. g., 364.2 F cm −3 at 1 A g −1 ) and high cycling stability (e. g., more than 95% of the initial capacity retention over 10 000 cycles at different current densities). The optimal sample is employed to fabricate a symmetric supercapacitor , which exhibits an energy density up to 8 Wh L −1 and a power density up to 11 800 W L −1 , respectively.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Liting Wei,Haiying Yang,Jiao Jiao
In this study, polypyrrole functionalized graphene sheets (PPY-GNs) have been used for the first time as a reinforced material for the ultrasensitive detection of atorvastatin by the electrochemistry method. The obtained PPY-GNs were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Due toits porous structure, the PPY-GNs-modified electrode has a large effective area, thereby improving the sensitivity of detection. The peak currents of atorvastatin at the GNs-modified glassy carbon electrode (GNs/GCE) and those at the PPY-GNs/GCE are increased dramatically compared to those on the bare GCE. The peak current at the PPY– GNs/GCE linearly increases with the increase in the atorvastatin concentration, which ranges from 20μM to 200μM. The detection limit of atorvastatin reaches 1.191μM based on the signal-to-noise characteristic (S/N = 3). The PPY-GNs-based electrochemical sensor was successfully used to detect atorvastatin in tablets with satisfactory results.
研究领域:
分析化学
·
材料科学
·
药物分析
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）