JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Zhenhua Wang,Jing Zhang,Yuxiang Yang,Xinyang Yue,Xiaoming Hao,Wang Sun,David Rooney,Kening Sun
Traditionally polyvinylidene fluoride membranes have been used in applications such as membrane distillation , wastewater treatment , desalination and separator fabrication. Within this work we demonstrate that a novel carbon nanofiber/polyvinylidene fluoride (CNF/PVDF) composite membrane can be used as an interlayer for Lithium Sulfur (Li S) batteries yielding both high capacity and long cycling life. This PVDF membrane is shown to effectively separate dissolved lithium polysulfide with the high electronic conductivity CNF not only reducing the internal resistance in the sulfur cathode but also helping immobilize the polysulfide through its abundant nanospaces. The resulting Li S battery assembled with the CNF/PVDF composite membrane effectively solves the polysulfide permeation problem and exhibits excellent electrochemical performance. It is further shown that the CNF/PVDF electrode has an excellent cycling stability and retains a capacity of 768.6 mAh g −1 with a coulombic efficiency above 99% over 200 cycles at 0.5C, which is more than twice that of a cell without CNF/PVDF (374 mAh g −1 ). In addition, the low-cost raw materials and the simple preparation process of CNF/PVDF composite membrane is also amenable for industrial production.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Luquan Ren,Wangxuan Li,Zhenguo Wang,Xueli Zhou,Chao Xu,Yulin He,Zhengyi Song,Qingping Liu
Spruce branches have a continuous gradient in the microfibril angle of helically entwined cellulose fibrils in their internal cell walls, which confers the modulation of the site-specific mechanical properties. This paper draws inspiration from the microstructure within spruce branches and successfully fabricates a biomimetic structural material assembled from stiff and soft resins in a double-helix distribution using rotational co-extrusion 3D printing . The tunability of the mechanical properties of the helical structural material can be achieved by regulating the helical degree and ratio of two resins in the extrusion filament in real-time. Additionally, a strategy for controlling failure is proposed through dynamic programming of the local structure within the printed sample. Furthermore, compared with the homogeneous beam, the prepared spruce-like beam can effectively mitigate stress concentration during the loading process, achieving greater deformation capacity. This helical structural material is expected to meet customized mechanical performance requirements and enrich the bionic structural material system.
研究领域:
材料科学
·
生物医学工程
·
仿生学
·
高分子材料
·
力学性能优化
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2018
·Vol. 39
·期 11
·1800048
·
IF 4.441
Shuang Pan,Mingjing Zhu,Luze He,Hongdong Zhang,Feng Qiu,Zhiqun Lin,Juan Peng
An intriguing morphological transition from poly(3-hexylthiophene) (P3HT) 1D nanofibers to 2D nanoribbons enabled by the addition of a series of alkylthiols is reported. First, P3HT 1D nanofibers are formed due to strong anisotropic π–π stacking between planar rigid backbones. Upon the addition of alkylthiols, P3HT nanofibers are transformed into nanoribbons associated with the crystallographic transition from edge-on orientation to flat-on orientation. The content of alkylthiols has a great influence on the P3HT morphology in the solution. The mechanism of such a morphological transformation is discussed based on the interaction between alkylthiols and P3HT chains. This work offers an effective strategy to tailor the crystal morphology and dimension of P3HT, which not only improves the understanding of P3HT crystallization but also may enable such discovery into conjugated polymer-based optoelectronic devices.
研究领域:
高分子化学
·
材料科学
·
凝聚态物理
·
纳米科技
·
有机电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2009
·
IF 1.51
Rongguan Lv,Jun Yang,Pengfei Gao,Yanna NuLi,Jiulin Wang
A mixture of nanoporous and nanofibrous silicon (NPNF-Si) is prepared by the mechanochemical reduction of SiCl 4 using Li 13 Si 4 as reducing agent in the presence of Super P carbon (SP) and the following thermal treatment and washing process. Morphologies and structures of the as-obtained composites are investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). After carbon coating via pyrolysis of polyvinyl chloride (PVC), the resulting NPNF-Si/SP/C composite is evaluated for the use as anode material in lithium-ion battery. It exhibits the first discharge capacity of 746.6 mAh g −1 at current density of 0.2 mA mg −1 and capacity retention of 91.1% after 30 cycles. The good electrochemical performance arises from the particular Si nano-structure, which can alleviate the volume effect during lithium insertion and extraction.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
锂离子电池
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR RECOGNITION
·
2016
·Vol. 30
·期 1
·e2566
·
IF 2.091
Hua-jin Zeng,Min Miao,Ran Yang,Ling-bo Qu
In this study, the fibrillation of hen egg-white lysozyme (HEWL) in the absence and presence of different concentrations of silybin was studied by thioflavin T spectroscopy, Congo red binding assays, 8-anilino-1-naphthalenesulfonic acid (ANS) fluorescence assay, circular dichroism, and transmission electron microscopy. The experimental results indicated that not only the fibrillation of HEWL at high temperature (65°C) and low pH (pH = 2.0) could be inhibited effectively by silybin but also the inhibition of HEWL by silybin followed a dose-dependent manner. Molecular docking studies indicated that 2 possible binding modes could be found in the interaction between silybin and HEWL via van der Waals forces and electrostatic forces as well as hydrogen bonding. One of these 2 conformations was directly entered into the cavity of HEWL (binding site I); the other was bound to the surface of HEWL (binding site II). In this way, silybin could not only increase the hydrophobicity of the cavity or the surface of HEWL but also influence the microenvironment of the binding site, which was able to stabilize the structure of HEWL and delay the process of HEWL fibrosis.
研究领域:
生物化学
·
分子生物学
·
蛋白质科学
·
药理学
·
结构生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 24
·16383-16392
·
IF 2.993
Wu Yadong,Wang Fang,Li Xianglong,He Jinmei,Huang Yudong
The synergic effect between each component in composite membrane has created a new concept to fabricate membrane materials and widen their applications. Previous trials have suggested that micrometer-scale aramid fiber (MAF) could be effectively split into nanoscale aramid fiber (NAF) by dissolution in DMSO/KOH. Addressed herein is a time-saving approach to incorporate graphene oxide (GO) together with NAF to fabricate composite membranes through π–π stacking interactions. NAF–GO composite membranes (GO/NAF) containing gradient contents of GO have been prepared using absolute ethanol as proton donor, making the drying process facile and fast. The obtained composite membranes exhibit excellent hydrophilicity and enhanced mechanical performance. The chemical structure, morphology, crystallization and mechanical strength of GO/NAF composite membranes are characterized, respectively, and the hydrophilicity of GO/NAF is also evaluated by static water contact angle measurements. In the case of medium GO content (1 wt%) used in this study, the composite membrane possesses both optimal mechanical performance and better hydrophilicity compared to other supplementations, indicating that absolute ethanol is a promising proton donor for flocculation, which makes the post-treatment process more economic.
研究领域:
材料科学
·
高分子化学
·
纳米技术
·
膜科学
·
表面科学
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2019
·
IF 5.439
Huaxia Zhang,Tianshu Liu,Yawei Zhu,Li Hong,Tianfeng Li,Xiqing Wang,Yujie Fu
In the present study, modified polyporous magnetic cellulose beads (PMCBs) were synthesized by several organic amines (EDA, DETA, TETA and AST) grafting PMCBs and then utilized as a new kind of support to immobilize Candida antarctica lipase B (CALB) for biodiesel production. The immobilized lipase catalysts based on PMCBs were characterized by Fourier transform infrared and scanning electron microscopy. The results showed that PMCBs-DETA was a more suitable immobilization support and the catalytic activity of immobilized lipases could reach 1.0 U/mg. Then the synthesized catalyst of CALB-PMCBs-DETA was used to produce biodiesel from Yellow horn seed oil via transesterification reaction. A high biodiesel yield (92.3%) was obtained under the optimal reaction conditions and the main compositions of the prepared biodiesel were tested by GC-MS. Moreover, the catalyst of CALB-PMCBs-DETA could be removed easily by a magnet and recycled at least 5 times. As a new kind of support, the modified PMCBs could be a promising alternative for the carriers of immobilizing enzymes used for the green and efficient production of biodiesel.
研究领域:
生物催化
·
可再生能源
·
酶工程
·
绿色化学
·
生物质转化
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 36
·47922
·
IF 2.188
Nan Pan,Juanrong Qin,Yuwei Fan,Zeke Li,Botao Song
In this study, mesoporous silica nanoparticles (MSNs) were embedded into the hydrophilic poly(vinyl alcohol) (PVA) nanofibrous mats to achieve sustained release of water soluble drug from hydrophilic nanofibrous mats. MSNs were successfully prepared based on a sol–gel method. Water soluble drug naproxen sodium was then loaded into the mesopores of the MSNs, and different amounts of the drug-loaded MSNs were further incorporated into the fibers by the electrospinning process. Morphology of the nanofibrous mats was investigated, and it was found that all the fibers exhibited fibrous structure. Interestingly, lots of protrusions could be observed from the scanning electron microscopy images with high magnification, and numbers of the protrusions increased with the increasing of loading ratios of the MSNs from 5 to 15%. In addition, the wetting behaviors of the nanofibrous mats were also measured, and the water contact angles of all the mats were measured to be 0°. Finally, the drug release results indicated that all the PVA/MSNs composite nanofibrous mats showed an obviously prolonged drug release. The optimal loading ratio of the MSNs in the nanofibers was 10% due to the slowest drug release rate. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47922.
研究领域:
药剂学
·
生物材料
·
纳米医学
·
药物递送系统
·
高分子科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dongdong Li,Junzhi Li,Mingrui Wang,Guangshe Li,Gennadi Milinevsky,Lili Wang,Wei Han
Low energy density remains a major obstacle limiting the development and application of flexible sodium-ion batteries (SIB). Thus, this study aimed to eliminate non-active materials in electrodes, which can be a feasible way to increase the energy density of SIBs. An anode made up of flexible, free-standing SnS 2 /Sb 2 S 3 /Ti 3 C 2 T x composite carbon nanofibers (SnSbS/T-M@CNF), a Na 3 V 2 (PO 4 ) 3 composite carbon nanofibers cathode (NVP@CNF), and composite gel polymer fiber electrolytes (CGPFE) were successfully synthesized through electrospinning. MXene nanosheets improved the electrical conductivity of the SnSbS/T-M@CNF electrode and absorbed sodium sulfide, inhibiting the loss of S during the reaction. Consequently, the SnSbS/T-M@CNF free-standing electrode could be stably cycled for 1000 cycles at a current density of 1 A g −1 and maintained a reversible capacity of 397.6 mAh g −1 . Further, the NVP@CNF cathode and CGPFE quasi-solid electrolyte half-cells had an excellent cycle stability and rate performance. The flexible, free-standing SnSbS/T-M@CNF anode and NVP@CNF cathode were assembled into quasi-solid-state full cells to test their application value. The SnSbS/T-M@CNF||CGPFE||NVP@CNF full cell had a very low resistance and could easily power a 3 V LED chest lamp. After 500 cycles, it maintained a discharge capacity of 153 mAh g −1 under a current density of 0.5 A g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
柔性电子器件
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zhanshi Ni,Haobo Bi,Chunlong Jiang,Hao Sun,Wenliang Zhou,Zhicong Qiu,Qizhao Lin
Faced with increasingly severe environmental and energy issues, the development and utilization of solid waste have become a trend. In this study, a thermogravimetric-Fourier infrared spectrometer-mass spectrometer (TG-FTIR-MS) was used to carry out the co-pyrolysis experiment of coal slime and cellulose. The samples with mass mixing ratios of 0:10, 1:9, 3:7, 5:5, 7:3, 9:1, and 10:0 were pyrolyzed in N 2 atmosphere. The percentages of mass loss during the pyrolysis of coal slime and cellulose were 15.69 and 94.28%, respectively. The addition of cellulose to the coal slime could significantly improve the pyrolysis performance of the sample. It was detected by FTIR that the pyrolysis of the blends mainly formed C=O-containing compounds. MS was used to monitor the ion current intensity of gaseous products of sample pyrolysis online. The average activation energy of the reaction between coal slime and cellulose calculated by the Kissinger-Akahira-Sunose method were 237.59 kJ/mol and 174.06 kJ/mol, respectively. The principal component 1 and principal component 2 dominated the co-pyrolysis process of coal slime and cellulose. The MAE, RMSE, and R 2 of the artificial neural network prediction model for predicting the pyrolysis process of the sample were 0.5249, 0.8244, and 0.9994, respectively. This research provided basic theory and data support for understanding the co-pyrolysis of coal slime and biomass.
研究领域:
能源化学
·
环境科学
·
热化学转化
·
可再生能源
·
固体废物利用
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 49
·42854-42862
·
IF 3.289
He Liu,Aiting Wang,Xu Xu,Mengmeng Wang,Shibin Shang,Shiwei Liu,Jie Song
Cellulose aerogels based on crosslinking of cellulose with 1,4-butanediol diglycidyl ether (BDE) were homogeneously synthesized in NaOH/urea aqueous solution followed by freeze-drying. In the NaOH/urea aqueous solution, cellulose existed in a sodium alkoxide form that could react with the epoxide groups of BDE. The rheological behavior of the cellulose/NaOH/urea aqueous solution showed that the crosslinking reaction occurred immediately once the BDE was added to the cellulose/NaOH/urea aqueous solution at room temperature. The X-ray diffraction (XRD) characterization identified a transition from the crystalline structure of cellulose to an amorphous state of cellulose aerogels with increasing amount of BDE. Elemental analysis revealed the variation in carbon and oxygen elemental percentages in cellulose aerogels caused by the reaction between cellulose and BDE. The porous network of aerogels was observed by scanning electron microscopy (SEM) and the pore size of the aerogels increased as a function of BDE. The water adsorbent ability of aerogels was up to 41 g g−1—even after 30 squeezing–adsorption cycles, the water adsorbent ability was still 37 g g−1.
研究领域:
高分子材料科学
·
纳米材料学
·
绿色化学
·
生物基功能材料
·
环境功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 17
·12747-12754
·
IF 2.019
Huang Feng,Yan Aihua,Sui Yanwei,Wei Fuxiang,Qi Jiqiu,Meng Qingkun,He Yezeng
Ni 3 S 4 @MoS 2 nanosheets grown on the carbon fiber paper (Ni 3 S 4 @MoS 2 /CFP) were successfully prepared via a facile one-step hydrothermal technique. Serving as a supercapacitor electrode, the obtaining Ni 3 S 4 @MoS 2 /CFP exhibits a remarkable specific capacitance of 1296 F/g, high rate capability of 57.8%, and excellent cycling stability of 96.2% retention after 5000 cycles. The superior electrochemical properties of Ni 3 S 4 @MoS 2 /CFP nanocomposite is attributed to the synergistic effects of the layeredNi 3 S 4 , MoS 2 and the conductive CFP.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）