CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Chang Li,Yanbin Yun,Fengguang Huang,Jiaming Mao,Jia Liu,Wenjuan Yang,Chunyun Zhou,Meng Li
The membrane contact absorption method is a promising technology for carbon dioxide (CO 2 ) capture, enhancing absorption efficiency and mitigating aerosol emissions. However, membrane wetting, an inevitable issue during the membrane contact absorption process, leads to a rapid decline in absorption rates, thereby limiting the development of this methodology. Focusing on the tendency of organic absorbents to induce membrane wetting, this study reports a novel modification method for amphiphobic polyvinylidene fluoride (PVDF) membranes. This method leverages polydopamine nanoparticles (PDANPs) to construct stable multi-level reentrant structures on the membrane surface, which are further enhanced for their hydrophobic properties through surface fluorination. The resultant amphiphobic membrane exhibits exceptional resistance to both water and organic wetting, with a water contact angle as high as 152.82° and contact angles above 90° for various organic absorbents. Long-term experiments demonstrate that the membrane material prepared by this method facilitates the stable and long-running operation of membrane contactors. Based on these findings, we analyze the structure–property relationship between the membrane surface microstructure and its amphiphobic performance. In conclusion, the fluorinated polydopamine hierarchical structure effectively resists membrane wetting induced by CO 2 absorbents, contributing to the promotion and application of CO 2 membrane absorption technology
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 36
·24682-24693
·
IF 10.7
Minghang Yang,Yu Deng,Mingguang Zhang,Shuaining Zhou,Cheng Liu,Xigao Jian,Yousi Chen
Three dimensional (3D) hierarchical carbon-based materials have attracted attention due to their excellent structural and microwave absorption properties. However, the construction of well-defined 3D multilevel layered structures currently relies on complex preparation processes and harsh preparation conditions. In this paper, hierarchical hollow porous carbon fibers (HPCFs) were prepared by modulating the sulfuric acid treatment time using low-cost polypropylene (PP) fibers as precursors. In situ doping and uniform distribution of a small amount of iron (Fe) in PP fiber sulfonation were achieved by introducing Fe into the sulfuric acid solution. Relying on the autocatalytic effect of Fe during high-temperature carbonization, the simultaneous growth of carbon nanotubes (CNTs) on the surface and inside of HPCFs was achieved by using the pyrolysis exhaust gas of sulfonated PP fibers as a carbon source. Due to the unique hierarchical structure and the synergistic effect of multi-polarization loss, the hierarchical CNTs/HPCFs composites (CNTs@HPCFs) exhibit excellent microwave absorption performance with a minimum reflection loss of −54.03 dB and a thickness as low as 1.9 mm. Moreover, an effective absorption bandwidth as high as 6.04 GHz (11.96–18 GHz) is achieved at thicknesses as low as 1.8 mm, covering the entire Ku-band. This study provides a new idea for the facile preparation of low-cost and efficient carbon fiber wave-absorbing materials, which is instructive for the structural design of CNT-loaded carbon fiber wave-absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiang Zhao,Mu Zhang,Hui Li,Wei Pan,Zhengtang Luo,Xudong Sun
The development of a simple and general approach for manufacturing complex hollow structures is essential to achieve rapid dynamic response and high energy density storage for supercapacitor electrodes. Herein, we report a versatile heating rate-controlled synthetic route to prepare MnCo 2 O 4 microspheres with multiple interiors. Comparative study reveals that MnCo 2 O 4 microspheres with core–shell structure (MCO-CSS) process the highest specific surface area (91.6 m 2 g −1 ) and oxygen vacancy density (0.16), which can provide more electroactive sites for surface Faradic reaction and further facilitate the kinetics of rapid charge storage. While the porous shell and well-defined gap endow MCO-CSS with excellent permeability and low-resistance pathways for electrolyte ions, as well as enhanced volume change accommodation. Benefiting from the structural advantages, MCO-CSS displays an excellent specific capacitance of 1064.4F g −1 at 1 A g −1 , remarkable rate capability, and satisfactory cycle stability (89.1% capacitance retention at 2 A g −1 over 1000 cycles). Additionally, an asymmetric supercapacitor device, with an MCO-CSS cathode and porous carbon spheres anode, delivers a remarkable energy density of 33.9 Wh kg −1 at a power density of 187.4 W kg −1 , as well as 84.13% capacitance retention over 3000 cycles at 1 A g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaoyang Wang,Jianguo Huang,Hao Feng,Jinfeng Li,Zidie Pu,Xiangchun Yin
The hierarchical architecture constitutes one of the key factors affecting the performance of microwave absorbing materials (MAMs). Herein, core-shell Fe 3 O 4 with a dendritic hierarchical structure is fabricated successfully by the melting method in a SiO 2 -B 2 O 3 -Al 2 O 3 -CaO-Fe 2 O 3 multi-component system. The multiple transmission scattering absorption mechanism is mediated by the unique microstructure, thus improving the impedance matching and the microwave loss ability of the material. According to its reflection loss curve, the microwave absorption was efficiently optimized, yielding a minimum reflection loss (R L ) of − 54.26 dB when the thickness was 3.47 mm, and the effective bandwidth (R L <10 dB) for electromagnetic wave reflectance reached 3.28 GHz (6.48–9.76 GHz) with a sample thickness of 1.8 mm. The present work adds new useful information for the designing of high-performance glass-ceramic MAMs.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 2
·751-762
·
IF 6.123
Cui Shiqiang,Zhang Yang,Liu Changjun,Lou Shanhao,Zhang Yue,Zhang Yumei,Wang Huaping
In order to research the multi-level structure of Lyocell fiber at different draw ratios and to reveal the limiting factors for preparing the high strength Lyocell fiber, the paper reports on the effect of draw ratio including low drawing (1–5), high drawing (6–11) and excessive drawing (12–20) on the multi-level structure and the mechanical properties of Lyocell fiber. The structure was determined by wide-angle X-ray diffraction, small-angle X-ray scattering and fibrillation test, and the result showed that, at low draw ratio stage, the breaking strength, yield strength and modulus of the fiber increased with the draw ratio owing to crystallinity as well as orientation increased while the micropore decreased, and there were almost no microfibrils on the fiber surface. At high draw ratio stage, the orientation of amorphous region increasing was the principal reason for the increase of fiber mechanical properties, and the micropores continued to decrease and a few short and thick microfibril was formed. At excessive draw ratio stage, the breaking strength remained constant mainly due to the basically unchanged crystallinity and orientation of the fibers, the yield strength and modulus decreased due to the slip of the highly crystallized and oriented elementary fibril. Meanwhile, the micropores still decreased and became more slender, the number of microfibrils increased and the microfibrils showed tenuous structure. It can be summarized that Lyocell fiber has the characteristics of multi-level structure, and the fundamental reason limiting the improvement of mechanical properties with draw ratio increasing is the slip of elementary fibril.
研究领域:
材料科学
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纤维化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Heng Luo,Hira Rehman,Xinyu Xia,Jinfei Zheng,Ping Li,Yang Li,Jinchao Tong
The development of wide-band microwave absorbing materials based on carbonaceous fillers remains a great challenge. In this study, carbon nanotubes (CNT) assembled coronal hollow clusters with efficient microwave absorbing performance have been obtained through successive hydrothermal and calcination process. Microstructural analysis reveals the distinct features of multiple assembly structures in the fabricated materials. The electromagnetic responses of Ni/CNT assembled clusters were examined across a frequency range of 2–18 GHz. Results demonstrate that the microwave frequency dispersion of electromagnetic parameters and reflection loss of Ni/CNT clusters are strongly influenced by weight loading. Multi-absorbing peaks with reflection loss better than − 40 dB could be achieved, while the equivalent absorbing band for RL < −10 dB covers 3.2–18 GHz, which account for 92.5% of the whole evaluated frequency range, and 62.5% for condition of RL < −20 dB. Furthermore, intrinsic attenuation beyond thickness derived semi-wavelength resonant absorption makes a major contribution to this superior performance. The underlying mechanism of dielectric response was investigated through Cole-Cole analysis and finite element simulation. ‘Micro-dipoles’ relaxation and hopping relaxation originated from defects within CNT and barrier between CNT, while the high magnetic dissipation capability of Ni nanoparticles make a major contribution to overall absorbing performance. All these are beneficial to regulation and optimization of microwave absorption performance of novel Ni/ CNT functionalized multistage architecture.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Liangyu Lu,Jian Li,Hongwei Li,Chengtao Gao,Haibo Xie,Yuzhu Xiong,Zhu Luo,Qi Sun,Fuping Dong
Hierarchical structured materials represent an interesting platform for many potential applications such as separation, catalyst and drug delivery etc. However, controlled fabrication of this special structure still remains a big challenge. In the present work, a controllable sol-gel procedure was developed to precisely fabricate polysilsesquioxane particles with bowls-on-sphere structure from mixed organoalkoxysilane precursors with sodium ligninsulfonate as surfactant and polystyrene spheres as structure-directing agents. The morphology of the particles can be fine-tuned by judiciously adjusting the ratio of two silane precursors, amount of ammonia, surfactant content and polystyrene amount. The formation mechanism of spheres-on-sphere structured polysilsesquioxane particles was explored.
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Lixue Gai,Qingda An,Zuoyi Xiao,Shangru Zhai,Haisong Wang,Weijie Cai,Zhongcheng Li
The configurations and compositions of an absorber play crucial role on the microwave absorption performance. Accordingly, the attenuation mechanism on the nanostructure with skillfully integrated components (e.g. dielectric loss and magnetic loss substances) is a highlight for constructing excellent absorbers. Herein, utilizing hierarchical succulent-like ZrSBA-15 as a template, the N-doped carbon layer containing Co nanoparticles embedded within ZrSBA-15 (Co-NCL@ZrSBA-15) composites were rationally constructed to acquire enhanced microwave absorption performance for the first time. The resultant Co-NCL@ZrSBA-15 composites exhibited high-performance microwave absorption capacity with low loading content of 25 wt % in a wax matrix. The minimum reflection loss (RL) value of −61 dB was achieved with the thickness of 2.0 mm at 16.8 GHz, and an effective frequency bandwidth (RL < −10 dB) was 4.4 GHz (13.6–18.0 GHz). Additionally, the minimum RL value are all less than −30 dB with thickness changing from 2.0 to 5.5 mm in the whole C, X and Ku absorbing band. Such excellent absorbing properties at lower filler loading and thin thickness endow the novel Co-NCL@ZrSBA-15 composites with gigantic potential for application in restrain electromagnetic wave pollution and interference.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 14
·6522-6531
·
IF 8.867
Yining Ma,Aibin Huang,Huaijuan Zhou,Shidong Ji,Shuming Zhang,Rong Li,Heliang Yao,Xun Cao,Ping Jin
Various V2O5 hierarchical structures were successfully synthesized via a template-free method by annealing diverse morphological VO2 sub-microspheres which can be facilely tailored by adjusting the solvothermal reaction duration. The VO2 sub-microspheres undergo a solid → yolk–shell → hollow → yolk–shell structure process with increasing time, which is believed to result from an unusual Ostwald-ripening process. After the annealing process, multi-structural VO2 sub-microspheres changed into hierarchical structures including fist-type structures consisting of nanorods, yolk–shell and hollow sub-microspheres composed of nanorods and a yolk–shell construction made up of nanoplates. As the cathode materials for lithium-ion batteries, among them, yolk–shell sub-microspheres comprised of nanoplates exhibited high reversible capacity, excellent cycling stability at high currents and good rate capacities. Without doping and compositing, the electrode delivered reversible capacities of 119.2 and 87.3 mA h g−1 at high current densities of 2400 and 3600 mA g−1, respectively, as well as a capacity retention of 78.31% after 80 cycles at 1200 mA g−1. The excellent electrochemical performance could be attributed to the purity of the phase and synergistic effect between the yolk–shell structure and hierarchical structure of the sub-microspheres, which make the yolk–shell V2O5 hierarchical structure a promising candidate for the cathode material for lithium-ion batteries.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Feng Zheng,Hanqin Gong,Zheng Li,Weiguang Yang,Jiahe Xu,Pengfei Hu,Yang Li,Yu Gong,Qiang Zhen
WO 3 microspheres film with a tertiary, textured and porous structure assembled of WO 3 hierarchical nanorods has been directly prepared on Cu foil using a one-step hydrothermal method . The field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) spectrum, X-Ray Diffraction (XRD), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) are used to reveal the surface microtopography, crystal structure, elementary composition, valence state and formation mechanism of WO 3 tertiary structure. Moreover, the electrochemical properties and supercapacitive performances of WO 3 microspheres film are also intensively investigated. The WO 3 microspheres film has high specific capacitances of 485, 426, 372, 319 and 260 F g −1 at unit currents of 0.5, 1, 2, 5 and 10 A g −1 and exhibits good cycle stability (93% after 5000 cycles) and reversibility (98.5%), a lower charge transfer resistance (0.5 Ω) and high energy densities ranging from 21 to 17 W h kg −1 corresponded to high power densities varied from 150 to 3000 W kg −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Membranes
·
2023
·Vol. 13
·期 10
·807
·
IF 4.2
Yixia Zhao,Zehao Zhang,Yan Zhang,Yuting Huang,Yanfei Chen,Bofei Chen,Weimin Kang,Jingge Ju
Recently, the multi-level interwoven structured micro/nano fiber membranes with coarse and fine overlaps have attracted lots of attention due to their advantages of high surface roughness, high porosity, good mechanical strength, etc., but their simple and direct preparation methods still need to be developed. Herein, the multi-level structured micro/nano fiber membranes were prepared novelly and directly by a one-step electrospinning technique based on the principle of micro-phase separation caused by polymer incompatibility using polystyrene (PS) and polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) as raw materials. It was found that different spinning fluid parameters and various spinning process parameters will have a significant impact on its morphology and structures. Under certain conditions (the concentration of spinning solution is 18 wt%, the mass ratio of PS to PVDF-HFP is 1:7, the spinning voltage is 30 kV, and the spinning receiving distance is 18 cm), the PS/PVDF-HFP membrane with optimal multi-level structured micro/nano fiber membranes could be obtained, which present an average pore size of 4.38 ± 0.10 μm, a porosity of 78.9 ± 3.5%, and a water contact angle of 145.84 ± 1.70°. The formation mechanism of micro/nano fiber interwoven structures was proposed through conductivity and viscosity tests. In addition, it was initially used as a separation membrane material in membrane distillation, and its performance was preliminarily explored. This paper provides a theoretical and experimental basis for the research and development of an efficient and feasible method for the preparation of multi-level micro/nano fiber membranes.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lan Qin,Shan Liu,Jifei Yang,Min He,Jie Yu
The rational modulating of the microstructure in magnetic carbon-based composites is crucial to optimize the electromagnetic wave (EMW) absorption performance. It is challenging for EMW absorbers to simultaneously achieve optimal minimum reflection loss (RLmin) and a broadband effective absorption bandwidth (EAB). In this paper, carbon nanotubes (CNTs)-modified NiCo/CNTs nanosheets were effectively prepared as a new EMW absorption material utilizing NiCo-containing metal-organic framework (MOF) as a sacrificial precursor. As expected, NiCo/CNTs-650 demonstrated both a broadband EAB of 7.04 GHz and the RLmin of − 58.14 dB at 15.9 GHz with a thickness of 2.0 mm. Furthermore, NiCo/CNTs-650 is capable of achieving 30.2 dB m 2 RSC (radar cross section) reduction under an incident angle of 7° via CST, while NiCo/CNTs-700 15 % achieved a reduction of 39.47 dB m 2 at 0 °. These performances outperformed that other CNTs-decorated MOF-derived hierarchical composites previously described. NiCo/CNTs-650 combines the synergistic effects of magnetic loss provided by zero-dimensional (0D) NiCo alloy, dielectric attenuation realized by one-dimensional (1D) CNTs, and optimized impedance matching through two-dimensional (2D) nanosheets with abundant hierarchical interfaces. These studies provide a specialized route for the manufacture of mixed-dimensional hierarchical EMW absorbents with high performance.
研究领域:
材料科学
·
电磁学
✓ 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）