CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Cheng Zhang,Runping Li,Jianhua Liu,Guo Chen,Shenghui Guo,Lei Xu,Shijie Xiao,Zhigang Shen
The effects of modification temperature and time on polyacrylonitrile (PAN) fibers under various concentrations of KMnO 4 were studied. Wettability , colouration, chemical structure (Fourier transform infrared spectroscopy), crystal structure (X-ray diffraction), stack domains (D), interlayer spacing (d), microscopic structure (Scanning electron microscopy) and elemental content (energy dispersive spectroscopy) were analysed. Aside from its good hydrophilicity, KMnO 4 at 2 and 4 wt% are beneficial to the modification of PAN fibers. The colouration of the fiber at 80 °C is the most obvious. The clear peak of the pre-oxidised fibers at 2340 cm −1 corresponds to the conjugated structure of MnO 4 –C N. At 4 wt%, the degree of pre-oxidation is too high and the main infrared peak disappears. M 2, 30 has a minimum D of 9.320 nm and 8.258 nm at 2θ = 16.883° and 2θ = 29.673°, respectively, and the fiber crystals are the finest. At a content of 4 wt%, the fibers are axially cracked and crystals appear on the surface. M 2, 30 and M 2, 60 have a close percentage of C element, whereas M 2, 30 has a lower percentage of Mn element. The best modification conditions of KMnO 4 are 2 wt%, 80 °C and 30 min.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Denghui Ren,Yaseen Muhammad,Youchao Chen,Yu Liu,Canyun Mao,Susu Xing,Ruinan Pei,Zhenxia Zhao,Jing Li
In this study, a surface modified polyacrylonitrile fiber (KF-PAN) with a fish-scale whisker-like biomimetic hierarchical structure was successfully prepared via in situ competition effect of Fenton reaction. The modified fibers were used as secondary modifiers to prepare fiber-reinforced styrene–butadienestyrene (SBS) block copolymers and rubber powder (RP) modified asphalt binders (KF-PAN/SBS/RP). Energy dispersive spectroscopy, scanning electron microscopy, and atomic force microscopy analyses revealed the successful construction of bionic hierarchy on the fiber surface, and confirmed rough surface of the KF-PAN fibers. The hierarchical structure of the fiber surface acted as a buffer in the asphalt and strengthened the mutual interaction of the fiber and asphalt. Dynamic rheometer shear and strip-tensile tests showed that the KF-PAN/SBS/RP modified asphalt exhibited better viscoelasticity, rutting resistance, and tensile properties than the PAN/SBS/RP modified asphalt. The linear amplitude sweep test showed that KF-PAN/SBS/RP modified asphalt had better fatigue resistance. Thermogravimetric analysis tests indicated that the surface bionic structure of KF-PAN fibers boosted thermal stability of the fibers, which in turn enhanced the thermal stability of KF-PAN/SBS/RP modified asphalt. Fluorescence microscopy analysis showed that incorporating KF-PAN fibers improved the SBS and RP microstructure inside the asphalt, forming a good mesh structure, and alleviating the stress concentration phenomenon in SBS/RP asphalt under external traffic load.
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Chunlong Zuo,Wei Tan,Jieyun Zhao,Lina Jiang,Yongli Zhang,Yuanlin Ren,Xiaohui Liu
To develop green and efficient polyacrylonitrile (PAN) fibers with excellent fire safety properties, a new biomass-based flame retardant (PPC@VA) with vinyl-terminated groups was prepared based on the reaction of hexachlorocyclotriphosphonitrile, teat polyphenols, ethylenediamine and vinylphosphonic acid. Subsequently, it was mixed with spinning solution to obtain PPC@VA/PAN through wet spinning, which were then chemically cross-linked via thermal initiation to achieve CC-PPC@VA/PAN fibers. CC-PPC@VA/PAN showed a significant improvement in flame retardancy with a limiting oxygen index value of 32.5 %. The peak of smoke production rate, total smoke production and CO production rate were lowered by 81.9 %, 77.8 % and 91.3 %. Besides, the hazardous gas HCN was greatly suppressed. Owing to the macromolecular entanglement, hydrogen bonding and covalent cross-linking, CC-PPC@VA/PAN improved elongation at break and tensile strength by 19.2 % and 72.1 %. Also, chemical cross-linking contributed to decrease the migration of P/N-based flame retardants, lower the potential risk of water eutrophication and increased the service life of the fibers.
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
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shuai Ran,Ji Qi,Xufeng Dong,Hao Huang,Min Qi,Wenjing Dong,Penghui Zhao,Zenghui Zhao,Jingyuan Yang
Controllable preparation of cross-linked mesoporous carbon materials on a large scale remains challenging. In the present work, a simple NaCl-assisted pyrolysis strategy is proposed here to efficiently convert closed pores into open pores in the pyrolysis products of 2-methylimidazole zinc salt nanoparticles/polyacrylonitrile (ZIF-8/PAN) electrospun fibers to prepare 1D cross-linked mesoporous N-rich carbon-based oxygen reduction reaction (ORR) electrocatalyst. The total specific surface area of micropores and mesopores was significantly increased from 162 m 2 /g to 1069 m 2 /g (mesopores: 704 m 2 /g). The ORR catalytic activity of open pore was superior to that of closed pore with more positive onset potential (0.96 vs . 0.85 V) and half-wave potential (0.79 vs . 0.72 V), larger limiting current density (5.23 vs . 3.62 mA cm −2 ) and electron transfer number (3.89 vs . 3.15). Such enhanced performance was attributed to the transformation from closed to open pores which greatly improved the mass transfer performance and the number of active sites.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 14
·7564-7571
·
IF 11.9
Yechen Si,Yunhao Jiang,Jiayi Liu,Hongyu Guan,Xing-Long Wu,Changsheng Shan
It is a huge challenge to develop safe and stable lithium metal batteries with high energy density owing to the growth of Li dendrites. Herein, for the first time, an oxidized ZIF-8/polyacrylonitrile (OZPAN) fiber film is designed as a multifunctional interlayer for constructing a novel Li metal battery with superior performance. The excellent lithophilicity and uniform porous structure of the OZPAN interlayer could anchor and regulate Li-ion flux with high ionic conductivity (2.22 mS cm−1), high Li+ transference number (0.78) and homogeneous Li deposition. Therefore, the Li//Li symmetric cell exhibits ultralow overpotential (11 mV) with long-term cycling stability and dendrite-free Li deposition. Moreover, Li//LiFePO4 (LFP) full cell has an extremely high capacity (162 mA h g−1 at 1C, close to the theoretical specific capacity of LFP), outstanding rate performance and high coulombic efficiency (more than 94%) during 500 cycles. This study demonstrates a promising interlayer strategy for developing high-performance Li metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 4
·905-913
·
IF 1.1
Pang Zengyuan,Gao Pengxiang,Meng Haonan,Cheng Zhenyu,Li Shen,Zhu Yanan
One-dimensional titanium dioxide (TiO 2 ) whiskers with controllable aspect ratios were synthesized by molten salt method adopting anatase TiO 2 nanoparticles as precursor, sodium chloride (NaCl) and dibasic sodium phosphate (Na 2 HPO 4 ) as medium. The particle size of TiO 2 nanoparticles and ratio of precursor and medium that can help to generate high aspect ratio TiO 2 whiskers were studied and selected. Light-colored antimony-doped tin oxide @ titanium dioxide (ATO@TiO 2 ) conductive whiskers were prepared by coating ATO on TiO 2 whiskers through coprecipitation then. Finally, the ATO@TiO 2 light-colored conductive whiskers were dispersed in polyacrylonitrile (PAN) to fabricate light-colored conductive fibers. The experimental results show that the ATO@TiO 2 whiskers exhibits ideal whiteness and conductivity with 65.5 Wb and 106 Ω·cm, respectively, and the resistivity of conductive fibers was 6.07×10 6 Ω·cm with 15wt% whisker content.
研究领域:
材料科学
·
纳米技术
·
无机合成
·
高分子科学
·
材料导电性能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Yingqing Zhan,Ximin Chen,Ao Sun,Hongshan Jia,Yucheng Liu,Lingli Li,Yu-Hsuan Chiao,Xulin Yang,Fei Zhu
Membrane separation technology has potential for purifying emulsified oily wastewater. However, the oils, soluble organic substances, and microorganisms can cause complex membrane fouling problems, thereby reducing the separation efficiency and service life. Herein, a highly permeable and multiple-antifouling composite membrane was prepared using porous PAN fibrous mat as support backbone for the assembly of Ag-decorated Bi 2 O 3 @ 3D MXene Schottky heterojunction and hydrophilic TA as the adhesive. The unique arrangement of 3D MXene heterojunction and hydrophilic functionalization effectively broke through the limitation of separation flux and synergistically enhanced the anti-fouling performance of membrane. Such fibrous composite membrane achieved an exceedingly high permeability (2717–3328 L·m −2 ·h −1 ) for various emulsified oils, while ensuring excellent oil/water emulsion retention rate (99.59%) and good cycle stability. Meanwhile, the composite membrane displayed favorable photocatalytic degradation performance toward degrading MeB (96.1%) and antibacterial ability. Furthermore, the MD simulation and free radical trapping experiments were carried out to unravel the molecular interactions during the separation process and the photocatalytic mechanism of composite membrane, respectively. Overall, the combination of photocatalytic self-cleaning, anti-oil adhesion, and antibacterial effect renders the membrane high permeability and multiple-antifouling performance, which provides a new strategy for dealing with complex oily wastewater in petrochemical industry .
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 34
·15503-15513
·
IF 3.591
Xu Yang,Yuhong Zhou,Zhaojie Sun,Chunhui Yang,Dongyan Tang
The integrated combination of zeolitic imidazolate framework-8 (ZIF-8) into electrospun fibers and surface functioned polyacrylonitrile (PAN) fibers with polydopamine (PDA) both showed great potential in the removal of heavy metal ions (such as Cr(VI)) from aqueous solution in our previous works. Based on these results, here we report a more facile strategy to fabricate composite ZIF-8@PDA/PAN fibers as efficient adsorbents by PDA coating assisted ZIF-8 continuous growth on electrospun PAN fibers. Benefiting from the abundant functional groups (including amino and hydroxyl) of PDA, ZIF-8 particles effectively grew and were loaded on the surface of fibers with uniform distributions and thicker ZIF-8 layers were obtained easily by prolonging the reaction time. The obtained composite ZIF-8@PDA/PAN fibers retained higher surface areas (the maximum of 299.9 m2 g−1) and appropriate pore sizes, meanwhile they exhibited super hydrophilicity and good water stability, which are well known to be vital for the removal of Cr(VI). Thus, the composite fibers exhibited significant removal efficiency (especially more than 90% at a lower initial Cr(VI) concentration) and also higher adsorption capacity (with a maximum of 212.7 mg g−1) and good recyclability.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Dingyang Chen,Tingting Ma,Xinyue Zhao,Xiaofei Jing,Rui Zhao,Guangshan Zhu
Efficient capture of radioiodine from aqueous solutions is of importance for sustainable development of nuclear energy and protection of the environment. However, current adsorbents under exploration suffer from limited adsorption capacity and powder form that are unfavorable for practical applications. Herein, we applied a “multi-functionalization integration” idea to construct novel electrospun fiber adsorbents (N-MOF-PAN fibers) containing cationic quaternary ammonium groups, uncharged amine groups, and porous MOF material (UiO-66-NH2), which in synergy adsorb iodine effectively from both saturated I2 aqueous solution and I3– aqueous solution. Iodine species (94.6%) could be removed from saturated I2 solution within 180 min, and 98.7% of iodine species were captured from I3– solution within 240 min. Additionally, the N-MOF-PAN fibers exhibited high iodine uptake capacities of 3.56 g g–1 from a concentrated KI/I2 aqueous solution and 3.61 g g–1 from the Langmuir isotherm model, surpassing many reported iodine adsorbents in the aqueous medium. Characterization and mechanism analysis indicated that multiple active sites simultaneously attribute to the high binding affinity toward iodine species through physical adsorption and chemical adsorption. Furthermore, benefiting from their macroscopic architecture, N-MOF-PAN fibers were used as the adsorption column for dynamic iodine capture with a bed volume of 1490 mL, which is much higher than commercially activated carbons. Overall, this work provides guidance for the development of novel fiber adsorbents for related applications.
研究领域:
环境科学
·
材料科学
·
核工程
·
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）