APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Mingjun Cui,Siming Ren,Jia Chen,Shuan Liu,Guangan Zhang,Haichao Zhao,Liping Wang,Qunji Xue
Homogenous dispersion of hexagonal boron nitride (h-BN) nanosheets in solvents or in the polymer matrix is crucial to initiate their many applications. Here, homogeneous dispersion of hexagonal boron nitride (h-BN) in epoxy matrix was achieved with a water-soluble carboxylated aniline trimer derivative (CAT − ) as a dispersant, which was attributed to the strong π-π interaction between h-BN and CAT − , as proved by Raman and UV–vis spectra. Transmission electron microscopy (TEM) analysis confirmed a random dispersion of h-BN nanosheets in the waterborne epoxy coatings. The deterioration process of water-borne epoxy coating with and without h-BN nanosheets during the long-term immersion in 3.5 wt% NaCl solution was investigated by electrochemical measurements and water absorption test. Results implied that the introduction of well dispersed h-BN nanosheets into waterborne epoxy system remarkably improved the corrosion protection performance to substrate. Moreover, 1 wt% BN/EP composite coated substrate exhibited higher impedance modulus (1.3 × 10 6 Ω cm 2 ) and lower water absorption (4%) than those of pure waterborne epoxy coating coated electrode after long-term immersion in 3.5 wt% NaCl solution, demonstrating its superior anticorrosive performance. This enhanced anticorrosive performance was mainly ascribed to the improved water barrier property of epoxy coating via incorporating homogeneously dispersed h-BN nanosheets.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Jingzhi Hu,Keyu Xie,Xiaoyan Liu,Shaohui Guo,Chao Shen,Xingrui Liu,Xuanhua Li,Jian-gan Wang,Bingqing Wei
A novel hexagonal boron nitride nanosheets (h-BN)-doped poly (vinyl alcohol)-sulfuric acid (PVA-H 2 SO 4 ) gel polymer electrolyte (GPE) is first fabricated through a facile freeze-thaw method. The ionic conductivities of the h-BN-doped PVA-H 2 SO 4 GPEs with various h-BN nanosheet contents are evaluated. With the optimal content of h-BN nanosheets (0.025 mg ml −1 ), the ionic conductivity of the GPE can reach up to 29 mS cm −1 , three times higher than that of GPE without the h-BN nanosheets (9 mS cm −1 ). The h-BN nanosheets are considered as a “super-highway” for ion transport in PVA-H 2 SO 4 GPE. Moreover, a symmetric qusai-solid-state supercapacitor, with activated carbon as electrodes and the h-BN nanosheets-doped PVA-H 2 SO 4 gel polymer as an electrolyte and separator, delivers a high specific capacitance, good rate capability, and excellent cycle stability. At the current density of 0.5 A g −1 , the symmetry qusai-solid-state supercapacitor can deliver an electrode specific capacitance of 124.5 F g −1 , and remain 99.2% capacitance after 5000 charge-discharge cycles. The h-BN nanosheets-doped GPE, with superior performance and facile synthesis method, appears to be a promising candidate for high-performance qusai-solid-state supercapacitors and other electrochemical devices, such as rechargeable batteries, fuel cells. This work also sheds light on the possibility to use 2D materials in advanced GPE.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Journal of Chemistry
·
2019
·
IF 1.727
Song-qi Hu,Yin Wang,Lin-lin Liu
Hexagonal boron nitride (h-BN) powders were fabricated by the combustion synthesis with B/KNO3/HMX (octogen) mixtures as reactants. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were adopted to investigate the phase composition and the chemical composition of the products, respectively. The morphology and resistance to oxidation were studied by scanning electron microscopy (SEM) and thermogravimetry (TGA), respectively. The characterization results showed that the h-BN which was produced through this method has high purity and exhibits excellent resistance to oxidation. The purity of h-BN is improved with the increasing content of HMX in reactants with boron carbide (B4C) and boron oxide (B2O3) as main impurity, but conversely, the yields are obviously decreased. Taking the comprehensive consideration of the purity and the yields together, the optimal molar ratio of B/KNO3/HMX is 10 : 1 : 4. In addition, the experimental results indicated that the crystalline grain size grows with the increasing content of HMX. The method explored in this study does not need expensive processing facilities and equipment, which is a preferable approach for the laboratory to prepare h-BN of high purity.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
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IF 3.42
Bingjie Zou,Xijiang Chang,Jingxia Yang,Shuchuan Wang,Jingli Xu,Shirong Wang,Seiji Samukawa,Lidong Wang
h-BN nanoflakes were treated in three plasma gases (Ar、Ar+H 2 (4:1)、Ar + NH 3 (4:1)) for surface modification. The structure characterization (XRD, IR, XPS etc.) of h-BN indicated that the plasma treatment not only enlarged the interlayer distance of h-BN, but also increased the NH/OH surface groups and the ratio of exfoliated h-BN planes. The plasma treated h-BN exhibited better dispersion and stronger Fe 2+ holding ability in acrylic resin than the pristine h-BN, resulting in smaller corrosion current density (i corr ) and larger charge transfer resistance for the acrylic coating on low carbon steel, especially treated in Ar + NH 3 (4:1).
研究领域:
材料科学
·
表面工程
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腐蚀科学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Cheng Li,Xiao Wang,Meng Zhang,Yue Sun,Yexiang Cui,Yanji Zhu,Huaiyuan Wang
Inert inorganic anti-corrosion fillers enjoy the advantages of stable performance, but most of them face the problems of poor compatibility and disability. Therefore, strategies about addressing the above problems need to be developed. Herein, based on interface enhancement strategy, one typical inert inorganic filler h-BN was armed with fluoro-substituted polyaniline (PFAN). To this end, diazotization reaction was utilized to introduce aniline group to h-BN, and emulsion polymerization was employed to grow the micro-size copolymer of aniline and 2-fluoroaniline. Benefitting from the above interface enhancement attempt, the compatibility of h-BN with resin was enhanced, which was explained by the chemical armed PFAN participated in the curing process of epoxy. Moreover, the disability of h-BN was also improved owed to this interface armor. Therefore, combining the fully developed barrier properties of h-BN with passivate ability of PFAN, the coating containing a small addition amount (0.9 wt%) of the composite fillers to epoxy coatings significantly improved their long-term corrosion resistance , which was confirmed by the EIS result that its low frequency impedance value was maintained above 10 10 and was about 10 3 times larger than that of pure EP coating after being immersed in 3.5 wt% NaCl solution for 120 days.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Kexin Liu,Shilong Yang,Yi Chen,Wenlei Zhang,Pu Liu,Xiucheng Zheng
The hydrolysis of ammonia borane (NH 3 BH 3 , AB) is an efficient strategy for high-purify hydrogen evolution . However, it is indispensable to develop a suitable catalyst because this reaction is kinetically infeasible at room temperature . In this work, we prepared a series of nano hexagonal boron nitride (h-BN) supported CuNi bimetallic catalysts through a facile adsorption-chemical reduction procedure. The effects of various molar ratios of Cu to Ni and CuNi loadings on AB hydrolysis were investigated in details. Benefitting from the proper porous structure , the interesting alloy effect of Cu and Ni, as well as the synergistic effect between h-BN and CuNi, 20 wt% Cu 0.5 Ni 0.5 /h-BN displays the highest catalytic activity among the as-prepared catalysts. Apart from satisfactory durability, the corresponding hydrogen generation rate, turnover frequency at 303 K in base solution and apparent activation energy are 2437.0 mL g −1 min −1 , 6.33 min −1 and 23.02 kJ mol −1 , respectively, which are very outstanding compared with many previous results. Our work not only provides a proper non-precious metal catalyst for hydrogen generation from the hydrolysis of chemical hydrogen storage materials but also offers a facile strategy for synthesizing metallic functional materials .
研究领域:
催化材料
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能源化学
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产品关联
DOI
高影响因子
RADIATION RESEARCH
·
2023
·Vol. 200
·期 3
·242-255
·
IF 3.4
Abdous Slimane,Derradji Mehdi,Mekhalif Zineb,Khiari Karim,Mehelli Oussama,Cherif Younes Bourenane
Given their substantial neutron capture cross-section, extreme hardness, and high chemical and thermal stability, boron-based materials are widely used as building blocks to protect against highly ionizing radiations such as gamma rays and neutrons. Indeed, uncontrolled nuclear radiation exposure can be highly hazardous to radiation workers and the public. In this sense, this work presents an extensive study and experimental evaluation of the nuclear shielding features of hexagonal-boron nitride (h-BN) based nanocomposite, where bisphenol-A based polybenzoxazine (BA-PBz) was used as matrix. The neutron shielding studies were carried out at the nuclear research reactor of Algeria NUR. The surface treatment of h-BN nanoparticles was confirmed by FTIR and XPS techniques. The curing behavior and the degradation phenomena of the nanocomposites were evaluated by DSC-TGA analyses. The distribution of h-BN nanoparticles within the polymer matrix was assessed by TEM and SEM. The results showed that the developed boron nitride-based nanocomposite exhibits intriguing shielding performances and good thermal stability. The DSC-TGA tests exhibit high degradation temperature that reach 279°C. The highest performances were obtained at an h-BN concentration of 7 wt%, where the macroscopic cross was found to be (Σ = 3.844 cm –1 ) with a screening ratio of (S = 96.12%), equivalent to a mean free path (λ) of 0.138 cm.
研究领域:
材料科学
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核工程
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化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Xuewei Yang,Rui Li,Yong Liu,Jian Xu,Ning Zhao
The rapid evolution of flexible wearable electronics necessitates efficient thermal management, driving the demand for materials that are not only thermally conductive but also electrically insulating and flexible. In this study, a thermal conductive composite with aligned filler structure was fabricated using catechol/tetraethylenepentamine (CAT-TEPA) surface-modified hexagonal boron nitride (h-BN) and mesophase pitch-based carbon fibers (MPCF) as fillers, and cellulose acetate butyrate (CAB) as the polymer matrix via evaporation self-assembly and hot-pressing. By optimizing the interface through CAT-TEPA modification and leveraging the long-range structural alignment of MPCF, an efficient thermal conduction network of h-BN sheets was formed. The composite containing 50 wt % total filler content (3 wt % MPCF) achieved an exceptional in-plane thermal conductivity of 21.75 W/mK, and a high volume resistivity of 1.5 × 1011 Ω·cm. Furthermore, the material demonstrated remarkable flexibility, making it a promising candidate for thermal management applications in flexible electronics.
研究领域:
材料科学
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热工学
·
柔性电子
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聚合物复合材料
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产品关联
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 24
·e202201554
·
IF 9.14
Yuanjun Zhao,Yanyang Qin,Xinyu Da,Xianjun Weng,Yiyang Gao,Guoxin Gao,Yaqiong Su,Shujiang Ding
Due to the unique safety qualities, solid composite polymer electrolyte (SCPE) has achieved considerable attentions to fabricate high-energy-density lithium metal batteries, but its overall performance still has to be improved. Herein, a high lithium salt content poly(vinylidene fluoride) (PVDF)-based SCPE was developed, enhanced by hexagonal boron nitride (h-BN) nanosheets, presenting perfect electrochemical performance, fast ion transport, and efficient inhibition of lithium dendrite growth. The optimized SCPE (PVDF-L70-B5) could deliver high ionic conductivity (2.98×10 −4 S cm −1 ), ultra-high Li + ion transfer number (0.62), wide electrochemical stability window (5.24 V), and strong mechanical strength (3.45 MPa) at room temperature. Density functional theory calculation further confirmed that the presence of h-BN could promote the dissociation of bis(trifluoromethanesulfonyl)imide lithium (LiTFSI) and the rapid transfer of Li + ions. As a result, the assembled symmetric Li/Li battery and asymmetric Li/LiFePO 4 battery using PVDF-L70-B5 SCPEs both exhibited high reversible capacity, long-term cycle stability, and high-rate performance when cycled at 60 or 30 °C. The designed SCPEs will open up a new route to synthesize solid-state lithium batteries with high energy density and high safety. Graphical Polymer electrolyte : High lithium salt content poly(vinylidene fluoride)-based solid composite polymer electrolyte enhanced by hexagonal boron nitride nanosheets is prepared, which presents perfect electrochemical performance, fast ion transport, and efficient inhibition of lithium dendrite growth.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子科学
·
锂离子电池
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jian-Min Li
The author reports an anthracene vapor-assisted transport growth (∼4.8% in yield) of freestanding atomically thin pristine two-dimensional (2D) hexagonal boron nitride (h-BN) nanoplates directly from bulk powders. A room-temperature dilute magnetism was first observed in the pyrolytic 2D [0001] h-BN nanoplates, which is attributed to the missing N atom numbers (NN) or existence of a nitrogen-vacancy (Nv) with volume fraction ∼1.46%. Upon the postannealing in ammonia, the unsupported ammoniated 2D h-BN nanoplates showed an enhanced robust ferrimagnetism with the effective magnetic moment as high as 0.024 μB/per N, and Néel temperature at 174.9 K. At 295 K, a symmetric electron paramagnetic resonance peak signal was experimentally measured at g ∼ 2.1267, revealing the presence of an unpaired electron trapped at a B atom site in B-rich h-BN. As a promising 2D dilute magnetic semiconductor candidate, our finding favors the ammoniated atom-thin h-BN nanoplate for realization of spintronic nanodevices operating at room temperature.
研究领域:
材料科学
·
凝聚态物理
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纳米技术
·
自旋电子学
·
磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Zhuo Zhang,Xiaoming Duan,Baofu Qiu,Zhihua Yang,Delong Cai,Peigang He,Dechang Jia,Yu Zhou
Textured hexagonal boron nitride (h-BN) matrix composite ceramics were prepared by hot pressing using 3Y 2 O 3 -5Al 2 O 3 (mole ratio of 3:5) and 3Y 2 O 3 -5Al 2 O 3 -4MgO (mole ratio of 3:5:4) as liquid phase sintering additives, respectively. During the sintering process with liquid phase environments, platelike h-BN grains were rotated to be perpendicular to the sintering pressure, forming the preferred orientation with the c -axis parallel to the sintering pressure. Both h-BN matrix ceramic specimens show significant texture microstructures and anisotropic mechanical and thermal properties. The h-BN matrix ceramics prepared with 3Y 2 O 3 -5Al 2 O 3 -4MgO possess higher texture degree and better mechanical properties. While the anisotropy of thermal conductivities of that prepared with 3Y 2 O 3 -5Al 2 O 3 is more significant. The phase compositions and degree of grain orientation are the key factors that affect their anisotropic properties.
研究领域:
材料科学
·
无机非金属材料
·
先进陶瓷
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热管理材料
·
结构功能一体化材料
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Yage Li,Shuaibing Wu,Feng Liang,Gongye Lv,Yu Tian,Haijun Zhang,Yong Liu,Guoqi Liu
Rod-like h-BN with an average diameter of 2 µm was synthesized at a relatively low temperature of 1200 °C through a catalytic pyrolysis precursor strategy using boric acid and melamine as starting materials, and Co(SO 3 NH 2 ) 2 ·4 H 2 O as a catalyst precursor. Subsequently, novel low-carbon Al 2 O 3 -C refractories were prepared via a replacement of the graphite with the as-synthesized rod-like h-BN. When 1 wt% h-BN rods were added to replace graphite, after 3 h coking at 1400 °C, the cold modulus of rupture, cold compressive strength , oxidation resistance , and thermal shock resistance of the specimen were increased by 16.4%, 24.8%, 31.2%, and 52.2%, respectively, compared with these of the control specimen. Moreover, the introduction of h-BN rods in the matrix enhanced the non-wetting ability of the refractory with molten slag, thus the rod-like h-BN modified low carbon refractory presented better slag corrosion resistance with reference to the specimen without h-BN rods.
研究领域:
材料科学
·
耐火材料
·
高温性能
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DOI
高影响因子
危险品化学品经营许可证（带存储）