Materials Research Express
·
2019
·Vol. 6
·期 7
·075005
·
IF 1.449
Xiaoxiao Zhang,Xiaogang Su,Bin Zhang,Jun Wang
The MnO2@CNFs hierarchical structures have been successfully synthesized through a facile hydrothermal reduction method. By controlling the addition amount of KMnO4, the electromagnetic parameters and microwave absorption performance can be tuned effectively. When the mass ratio of CNFs and KMnO4 was 4:1, the obtained composites exhibited strong reflection loss of −42.77 dB at 4.32 GHz with an absorbent thickness of 4.5 mm. Meanwhile, the effective absorption region was 2.8 GHz (13.07–15.87 GHz) at a thin thickness of 1.5 mm. The superior electromagnetic attenuation performance of MnO2@CNFs is ascribed to the unique hierarchical structure. Further, the MnO2 nanoflakes vertically growing on CNFs modulate the complex dielectric parameters of MnO2@CNFs, leading to well-matched characteristic impedance. In addition, the interlaced conductive network is also beneficial for dissipating the incident EM waves through multiple scattering in the large surface area of MnO2. Prospectively, the synthetic strategy proposed in our work can be extended to the fabrication of other carbon-based microwave absorbing composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 10
·7606-7615
·
IF 2.22
Cai Haopeng,Wei Qinqin,Xiao Hongbo,Liu Hongwei,Wang Jun
The petal-like CoO/CNFs composites was synthesized in situ by a simple hydrothermal modus. Electromagnetic parameters of the CoO/CNFs composites are further adjusted by adjusting the weight fractional number of the CoO. A rich interface of CoO is introduced into the carbon nanofibers to form a flower-like composite. This unique flower-like layered structure and appropriate electromagnetic parameters effectively enhance the impedance matching and attenuation capabilities. When the mass ratio of CoO to CNFs is 2:1, the obtained flower-like CoO/CNFs composites achieves a maximum reflection loss of − 34.62 dB with a thickness of 3 mm at 7.8 GHz. At the same time, the effective absorption area is 2.89 GHz (7.035–9.925 GHz). Therefore, taking into consideration its excellent microwave absorption properties, the petal-like CoO/CNFs composites may be deemed as a high-efficiency absorbing agent that satisfies the impedance matching and attenuation characteristics.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Discover Applied Sciences
·
2024
·Vol. 6
·期 4
·1-16
·
IF 0
Liu Xiaohong,Basta Altaf H.,Liu Rui,Fu Shiyu
This study describes the preparation of cellulose nanofibers (CNFs) with varying amounts of carboxyl groups from rice straw pulp using the TEMPO/NaBr/NaClO oxidation system. The resulting CNFs were found to be in the form of nanofibers with an average diameter of 6 nm and an average length of 160 nm. To further enhance their properties, the CNFs were grafted with polycaprolactone (PCL) to create CNFs-g-PCL, which was then blended with shape memory polyurethane (SMPU) to produce CNFs-g-PCL/SMPU composites. It was observed that as the carboxyl content in CNFs increased from 0.35 to 1.14 mmol/g, the graft ratio of PCL on CNFs decreased from 24.6 to 10.7%. Consequently, the hydrophobicity of the grafted product (CNFs-g-PCL) also decreased. When 10% CNFs-g-PCL was added to the SMPU matrix, the elastic modulus and tensile stress of the resulting composite were both higher than those of the pure SMPU, increasing by up to 54.4% and 67.3%, respectively. Additionally, the shape retention and shape recovery rates of the composite remained stable after addition of CNFs-g-PCL. In conclusion, incorporating CNFs-g-PCL into SMPU can improve its mechanical properties while maintaining its shape memory properties. Graphical abstract
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
DOI
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Youqing Wu,Yi He,Chunlin Chen,Hongjie Li,Yunqing Xia,Taigang Zhou
To enhance the anticorrosive and mechanical performances of carbon nanofibers (CNFs) in epoxy (EP) coatings, molybdenum disulfide (MoS 2 ) and γ- (2, 3-epoxypropoxy) propytrimethoxysilane (KH560) have been combined for inner reinforcement and outer surface modification based on CNFs . The electrochemical impedance spectroscopy, tensile testing and microhardness testing demonstrated that MoS 2 -CNFs (0.8%) composite can prominently enhance the anticorrosive and mechanical performance of the EP coating. Furthermore, the impedance of EP/MoS 2 -CNFs (0.8%) was higher than that of the pure EP and other composite coatings, and the Young’s modulus (EY) and tensile strength (σs) of EP/MoS 2 -CNFs (0.8%) were increased by 65.4% and 56.6%, respectively.
研究领域:
材料科学
·
腐蚀与防护
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Huayu Wu,Mohan Yue,Lin He,Miao Zhang,Yimin Huang,Chang Sun,Yu Liu,Jindi Wang,Rongguan Lv,Rong Xing
A nanofiber necklace with a box-shaped structure has been designed. The box-shaped template can introduce other transition metal compounds, effectively compensating for the intrinsic defects of electrode materials. α-Fe 2 O 3 nano cubes as the template mix with PAN to get α-Fe 2 O 3 /PAN. And then the α-Fe 2 O 3 nano cubes calcine to form Fe 3 O 4 with more valence state under high temperature, which get the box-shape necklace-like structure Fe 3 O 4 -CNFs. The confined space has formed by high concentrated HCl etching, the box-shaped necklace-like Fe 3 O 4 /MoS 2 carbon nanofibers (BN Fe 3 O 4 /MoS 2 -CNFs) anode material is obtained by hydrothermal method of confining growth of MoS 2 nanosheets. The mixed valence state of Fe 3 O 4 (Fe 3+ /Fe 2+ ) can effectively improve the conductivity of MoS 2 nanosheets. The box-shape necklace structure constructed by α-Fe 2 O 3 nanocube has mesoporous structure and confined space, which can alleviate the volume effect of electrode material. When the electrode material is applied to the SIBs, the reversible capacity is 354 mA h g −1 after 500 cycles at 0.5 A/g, and the specific capacity of 131.5 mA h g −1 can be maintained at 8 A/g. On the one hand, the heterogeneous structure in the confined space alleviates the volume effect of the material, thereby improving the long cycle performance, on the other hand, it effectively enhances the electrical conductivity and increases more lithium/sodium storage sites.
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 ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ruiyuan Zhuang,Yuxin Wang,Junhong Wang,Jianfeng Zhan,Jiangnan Yan,Yongqing Li,Yaru Chen,Wenhui Mo,Jian-chun Wu,Jianhong Yang,Lixiang Wang
Aluminum ion batteries (AIBs) are deemed an encouraging prospect for energy storage applications owing to their beneficial attributes, including considerable theoretical specific capacity, heightened safety measures, affordability, and plentiful availability of materials. However, the inherent characteristics of cathode materials have greatly limited the further development of AIBs. In this work, SnS 2 @CNFs composites were prepared via a combination of hydrothermal and electrospinning strategy. Specifically, SnS 2 nanosheets, resembling flakes in their two-dimensional form, uniformly coated on the carbon fibers, forming a three-dimensional interconnected network seamlessly integrated with the continuous carbon substrate. This structure is conducive to shortening the ion transmission path, ensuring sufficient electrolyte contact, and facilitating electron transfer and transfer at the phase interfaces. As a self-supporting electrode for AIBs, the SnS 2 @CNFs electrode exhibited remarkable cyclability, retaining a residual capacity of approximately 70 mA h g −1 with a Coulombic efficiency close to 97 % after 500 cycles at 100 mA g −1 . The good cycle stability originates from the flexible carbon substrate effectively alleviating the volume expansion phenomenon caused by ion deintercalation in SnS 2 . In addition, first-principles calculations show that the substitution behavior of aluminum atoms in SnS 2 crystals exhibits obvious selectivity, but exceeding the energy threshold of conventional substitution reactions indicates that reactions are unlikely to occur. By constructing models to explore the embedding path of aluminum ions in SnS 2 crystals, the results showed that the embedding behavior mainly occurs in the van der Waals gap interstitial rather than within the crystal monolayer, and the sulfur atom top position is used as the optimal embedding site.
研究领域:
材料科学
·
电化学
·
计算物理学
✓ 已验证
产品关联
DOI
高影响因子
Food Hydrocolloids for Health
·
2025
·
IF 5.1
Adila Abdirym,Wu Xue,Liu Bin
This work investigated the stabilization mechanisms and β-carotene encapsulation characteristics of cellulose nanofibrils (CNFs) stabilized Pickering emulsions, comparing different emulsification processes. For the 48 days storage, Pickering emulsions (PE) made by ultrasounds (US) and employed at least 2.0 wt.% CNFs as emulsifiers/stabilizers has obvious cream stabilization, and PE made by high pressure homogenization (HPH) and employed at over 1.2 wt.% CNFs can have rather excellent stabilization. The stabilization of HPH emulsions which was superior to that of US emulsions mainly relied on steric stabilization of CNFs space networks. Although the β-Carotene encapsulation efficiency of US emulsions was higher than that of HPH emulsions when the CNFs concentration was over 1.2 wt.%, the β-Carotene retention rate of US emulsions was obviously lower than that of HPH emulsions. So, the internal space structure of CNFs stabilized Pickering emulsions made by HPH was conducive to stabilizing emulsion and protecting bioactive molecule.
研究领域:
食品科学与技术
·
纳米材料
·
胶体与界面科学
·
封装技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Heqiang Liu,Yubei Zhang,Xingmin Liu,Wenyan Duan,Minghang Li,Qian Zhou,Shan Li,Gong Wang,Guifang Han
Electromagnetic absorption materials that possess efficient absorption performance and broad absorption bandwidth are needed to combat the electromagnetic interference (EMI). SiBCN ceramic-based metamaterials modified with defect-rich carbon nanofibers (CNFs) were developed by combining the additive manufacturing technique and polymer derived ceramic route. Meta-structures were patterned by additive manufacturing of preceramic polymer and followed by thermolysis of the green bodies. Defect-rich CNFs were in-situ generated by thermolysis of nanocellulose introduced into the preceramic green bodies. When the content of cellulose is 6.0 wt% and the annealing temperature is 1200 °C, the real and imaginary part of permittivity can reach as high as 17.0 and 7.0, respectively. Cole-Cole circle plots indicates that the CNFs-SiBCN ceramics possess strong polarization capability due to the defect-rich structure of CNFs. At the thickness of 1.8 mm, the minimal reflection loss (RL min ) can reach −20.0 dB while the effective absorption bandwidth reached 2.85 GHz. Through multi-scale (nano and macro) designing, a simulated ultra-broad effective absorption bandwidth of 32.4 GHz from 7.6 GHz to 40 GHz was achieved, where the RL min reached −46.0 dB at the frequency of 26.8 GHz. This work finds innovative route for the development of ceramic-based broadband electromagnetic absorption materials and new application for the polymer derived ceramics.
研究领域:
材料科学
·
电磁学
·
陶瓷
·
增材制造
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuezhen Mao,Rongna Chen,Huanhuan You,Yang Liu,Sunrui Luan,Li Hou,Faming Gao
Antimony-based anodes possessing advantages of stable operating voltage and high theoretical capacity can replace graphene as alloy-based electrodes material in LIBs applications. However, the problems of capacity decaying and poor stability of Sb-based materials due to volume expansion and structural crushing during the long-term cycling remain to be solved. Therefore, we propose a strategy of using S and N co-doped carbon nanofibers encapsulated with Sb nanoparticles to overcome the above problems. The proposed material exhibits an excellent lithium storage performance with a high reversible specific capacity of 734 mAh g −1 at 0.1 A g −1 after 50 cycles (474.8 mAh g −1 at 1 A g −1 after 800 cycles, 394.5 mAh g −1 at 2 A g −1 after 2000 cycles). Importantly, a specific capacity of 288.5 mAh g −1 remains after more than 5000 cycles. The superior electrochemical performance of the S and N co-doped electrode is attributed to the proven structure and stability of the carbon matrix alleviating the volume changes of Sb during the process of lithium intercalation and extraction. The alloying/de-alloying reactions of the S@Sb@N-CNFs composite in the first charging/discharging process were systematically investigated by ex-situ XRD . This strategy of S and N co-doped carbon matrix could establish Sb-based materials as potential high-performance anodes for LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yunyun Ding,Panpan Li,Jiashuang Wang,Xian Li,Yun Liu,Hongcun Bai,Hui Zhang
Si has become the most promising anode materials for lithium-ion batteries (LIBs) due to its high theoretical specific capacity and comparable low discharge potential. However, the practical usage of Si is still hindered by its huge volume expansion. To release volume stress and improve conductance, designed self-supporting binder-free Si electrode endowed with three-dimensional structure has been come up in this research. The pore structure is adjusted by rationally designing the proportion of carbon nanotubes (CNTs) and carbon nanofibers (CNFs) to alleviate volume change. Simultaneously, construct stable conductivity network was fabricated via ice crystal self-assemble freezing technique following compress and carbonization process. The electrochemical specific capacity of rGO@CNTs@CNFs@Si-2 electrode has stably remained at 2250 mAh/g after 100 cycles (100 mA/g) with benign rate capabilities. This simple self-assemble method for self-supporting binder-free Si electrode would open a new route to exploit high energy density Si-based electrode for flexible LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Zhe Wang,Zhengpeng Zhu,Kai Xue,Xingmei Guo,Yuanjun Liu,Xiangjun Zheng,Qianqian Fan,Zhongyao Duan,Qinghong Kong,Junhao Zhang
To solve the serious volume expansion problem of Sb-based anode materials in the alloying/dealloying process, a strategy combining electrospinning and hydrogen reduction is proposed to prepare a series of Sb-based alloys/carbon nanofiber composites (SbM/CNFs, M=Co, Zn, Ni). Inactive elements are innovatively introduced to form Sb based alloys with enhanced stability. The results show that the content of SbCo nanoparticles is high to 69.12% (mass), which are uniformly dispersed in carbon fibers. When evaluated as anode material for SIBs, SbCo/CNFs anode exhibits excellent sodium storage capacity, the initial discharge capacity is 580.0 mA·h·g −1 at 0.1 A·g −1 , which can hold 483.5 mA·h·g −1 after 100 cycles. Even the current density increases to 1.0 A·g −1 , the specific capacity still maintains at 344.5 mA·h·g −1 after 150 cycles. The improved sodium storage capacity is attributed to the synergistic effect of conductive carbon fibers and SbCo nanoparticles with uniform dispersion, which not only provide excellent electronic conductivity, but also enhance structural stability to reduce volume change.
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 ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Yi Zhang,Yingying Lu,Yi Zhang,Ningbo Zhang,Hailong Yan,Yinghui Wang,Hongyan Zhou,Yamin Zhang,Deyang Zhang,Gang Yang,Jinbing Cheng
Intercalation-type niobium-based oxides offer considerable promise as lithium-ion battery (LIB) anodes due to their safe operating voltages and structural robustness. However, their intrinsically poor electronic conductivity and sluggish ion transport impede practical deployment. Herein, we report a CoNb 2 O 6 @MXene/carbon nanofibers (CoNb 2 O 6 @MXene/CNFs) composite fabricated via electrospinning and controlled annealing. By embedding CoNb 2 O 6 nanoparticles and highly conductive Ti 3 C 2 T x MXene nanosheets within a flexible carbon nanofiber framework, this hierarchical architecture establishes efficient multi-dimensional electron/ion transport pathways. The excellent electrical conductivity of MXene enhances the charge transfer kinetics, while the carbon nanofiber matrix prevents particle aggregation and buffers volume expansion. Consequently, the optimized electrode achieves a high initial discharge capacity of 762.2 mAh g −1 at 0.1 A g −1 , maintaining 378.6 mAh g −1 after 200 cycles.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）