Polymers
·
2018
·Vol. 10
·期 6
·591
·
IF 2.935
Jingrong Liu,Tao Liu,Zhangwei Guo,Na Guo,Yanhua Lei,Xueting Chang,Yansheng Yin
The effect of single-layer graphene sheets (Gr) on the corrosion protection of zinc-rich epoxy primers (ZRPs) was investigated. Scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS) were used to characterize morphology and composition of the coatings after immersion for 25 days. The cross-sectional SEM images and X-ray photoelectron spectroscopy (XPS) confirmed that the addition of single-layer graphene facilitated assembling of zinc oxides on the interface between the coating and the steel. The open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) measurements revealed that both the cathodic protection and barrier performance of the ZRP were enhanced after addition of 0.6 wt. % Gr (Gr0.6-ZRP). In addition, the cathodic protection property of the Gr0.6-ZRP was characterized quantitatively by localized electrochemical impedance spectroscopy (LEIS) in the presence of an artificial scratch on the coating. The results demonstrate that moderate amounts of single-layer graphene can significantly improve corrosion resistance of ZRP, due to the barrier protection and cathodic protection effects.Keywords:graphene;zinc-rich epoxy primer;cathodic protection;localized electrochemical impedance spectroscopy
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KEY ENGINEERING MATERIALS
·
2019
·
IF 0
Yan Xuan Ma,Yingrui Zhang,Jia Tong Liu,Meng Yao Li,Ya Qian Xu
The effectiveness of preploymer and 1,6-Hexamethylene diamine encapsulated by double-walled microcapsules based polyurea (PUA) was explored for healing the cracks generated in epoxy coatings. Double-walled microcapsules were systhesized by interfacial polymerization at the interface between the prepolymer droplets and the 1,6-Hexamethylene diamine droplets to form the polyurea shell. The effect of synthetic stirring speed on the morphology of the microcapsules was observed by scanning electronmicroscopy (SEM) and optical microscopy (OM). The chemical structure as well as the thermal properties and the core content were characterized by Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric analyzer (TGA) respectively. Electrochemical impedance spectroscopy (EIS) studies of the artificial scratched area showed that the coating containing 2wt% and 5wt% microcapsules could effectively prevent further corrosion of the coating with high corrosion resistance efficiencies of 61.61% and 45.99% after immersing for 144h in seawater.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
SYNTHETIC METALS
·
2014
·
IF 2.222
L. Ai,Y. Liu,X.Y. Zhang,X.H. Ouyang,Z.Y. Ge
A facile, template-free method to prepare polythiophene microspheres with uniform size and well spherical shape is successfully performed, using anhydrous FeCl 2 as catalyst and H 2 O 2 as oxidant by a one-pot chemical oxidation polymerization. The structure and morphology of polythiophene nanoparticles is characterized by IR, SEM and TEM. Polythiophene nanostructures exhibit good morphology of microspheres with a very narrow particle size distribution. By fine tuning the reaction conditions, different sizes and nanostructured polythiophene can be obtained. The corrosion protection property of polythiophene microspheres-containing coatings on mild steel is investigated by electrochemical impedance spectroscopy (EIS) technique in 3.5 wt% NaCl aqueous solution. The results indicated that the waterborne polythiophene microspheres-containing coatings (polythiophene content, 0.6 wt%) could offer high protection because the impedance values remained at higher than 1 × 10 6 Ω cm 2 after 360 h. All the results are compared with these of the pure waterborne epoxy coatings on mild steel.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Xiangyu Wen,Xingbao Zhu,Yuanguo Wu,Yu Wang,Zining Man,Zhe Lv,Xi Wang
Oxygen selective membranes (OSMs) are considered to be an optimal solution for problems of lithium-air batteries (LABs) operating in an open environment. In this study, we use an electrostatic spinning method to fabricate a porous polytetrafluoroethylene hexafluoropropylene (PVDF-HFP) based oxygen selective membrane that was further impregnated with perfluoropolyether (PFPE) to achieve the goal of preventing permeation of moisture. The lithium-air battery under the protection of PFPE@PVDF-HFP can cycle stably for 620 h in an ambient air with relative humidity (RH) of 50%, which is 8 times better than the battery without the protection of OSM. In addition, through in situ electrochemical impedance spectroscopy (EIS) measurements, we illustrate the characterization of OSM more accurately. This electrochemical method provides a novel idea for the characterization of the performance of OSMs. The introduction of ruthenium oxide (RuO 2 ) nanoparticles to the cathode can further improve the cycling performance from 620 to 1200 h by promoting the decomposition of by-products.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 5
·51571
·
IF 3.125
Legang Chen,Zongxue Yu,Di Yin,Kunyao Cao,Chunxia Xie,Lijuan Zhu,Yong Jiang
Herein, a new strategy for improving epoxy coatings' anti-corrosion performance has been developed, which combined NH 2 -Ce-MOF with graphene oxide (GO) by hydrothermal method. First, the nanocomposite material's morphology and structure (GO-Ce-MOF) were confirmed by Fourier transform infrared, X-ray diffraction, TG, X-ray photoelectron spectroscopy, and scanning electron microscope (SEM) studies. The dispersity of the composite in the epoxy coating was evaluated by SEM and mapping analysis. Meanwhile, the anti-corrosion of as-prepared composite coatings was investigated in detail by the electrochemical impedance spectroscopy (EIS) and the Tafel polarization curve test. The results illustrated that 2.0 wt% GO-Ce-MOF/EP greatly enhanced the composite coating's anti-corrosion performance compared to other coatings. The reasons for the improvement of the anti-corrosion performance of the composite coating are attributed to the following two aspects: On the one hand, the addition of GO can provide a physical barrier to form a labyrinth effect to slow down the invasion of corrosive media into the metal substrate, on the other hand, the modification of GO can GO-Ce-MOF achieve better compatibility and dispersion in epoxy resin.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jun Ma,Zhou Yufeng,Jing Xu,Lin Gu,Guoqiao Lai,Bin Chen,Shuan Liu,Haichao Zhao,Haibin Yu,Jianmin Chen
Photopolymerization of urethane acrylate (PUA) containing solution-processable dibutyl-substituted poly(3,4-propylenedioxythiophene) (Poly(ProDotBu2)) was applied on Q235 carbon steel. The corrosion resistance of as-prepared composite coatings with various contents of Poly(ProDotBu2) was studied by electrochemical techniques including open-circuit potential (OCP), potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). It was observed that the PUA/Poly(ProDotBu2) composite coatings exhibited an excellent corrosion resistance and barrier properties in comparison with pure PUA coating.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shuyu Xie,Jihui Wang,Wenbin Hu
ZnAl-MoO 4 -LDHs film was fabricated in situ on the Q235 steel substrate by aluminizing process, coprecipitation method and ion-exchange method. The morphology, composition and structure of the LDHs film were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. The anticorrosion capability of the Q235 steel with LDHs film was observed by electrochemical impedance spectroscopy (EIS) and polarization curve. The LDHs film had a plate-like morphology which is the typical grain morphology of LDHs, and a particle size ranging from 2 pm to 4 pm and a particle thickness ranging from 0.05 pm to 0.2 pm. The increase of the layer spacing of LDHs film and the absorption peak of MoO 4 2- in FT-IR spectra can prove the intercalation of MoO 4 2- . Compared with bare Q235 steel, the corrosion current density of the Q235 steel with LDHs film decreased and the polarization resistance increased. The improvement of corrosion resistance is owed to the LDHs film which plays as a barrier between the substrate and the corrosive medium. The exchangeability of the interlayered anions of LDHs can catch the corrosive chloride ion in the medium and the MoO 4 2- released from the LDHs layer can play as corrosion inhibitor.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Ai-Min Yang,Yang Han,Shan-Shan Li,Hong-Wei Xing,Yu-Hang Pan,Wei-Xing Liu
Bi 2 WO 6 nanofibers and hierarchical microspheres were synthesized by an electrospinning process and a hydrothermal method . The phase, microstructure and photocatalytic performance of the obtained Bi 2 WO 6 photocatalysts were investigated. The X-ray powder diffraction and Fourier transform infrared spectroscopy suggest that Bi 2 WO 6 nanofibers and hierarchical microspheres have the single orthorhombic phase. The scanning electron microscope and transmission electron microscope images show that Bi 2 WO 6 nanofibers are composed of nanoparticles and Bi 2 WO 6 hierarchical microspheres consist of a large number of nanosheets . The Barrett−Emmett−Teller results, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflectance spectra, emission spectra, photocurrent and electrochemical impedance spectroscopy reveal that Bi 2 WO 6 hierarchical microspheres have a higher photocatalytic activity than that of Bi 2 WO 6 nanofibers. This is confirmed by the photo decomposition of Rhodamine B under light irradiation. The Bi 2 WO 6 hierarchical microspheres show a faster and higher efficiency decomposition of Rhodamine B under light irradiation. The higher photocatalytic activity of Bi 2 WO 6 hierarchical microspheres results from the larger specific surface area. The large specific surface area provides more surface active sits and makes an easier charge carrier transport.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Wanshuang Zhou,Cong Yu,Xinbo Wang
Rapid, sensitive, and high-fidelity detection of toxic radioiodine species is of great importance for first responder activities in case of nuclear accidents. Robust active materials that enable concise device processing and direct online electrical detection of vaporous iodine under ambient conditions are promising and urgently required. Here, we explore the use of a polymer of intrinsic microporosity (PIM-1) as the sensing layer to directly detect the real-time iodine vapor using the electrochemical impedance spectroscopy (EIS) technique. Good solubility of PIM-1 makes it easy for thin film fabrication, while the intrinsic microporosity endows the sensor with strong signal amplification capability. The sensor exhibits marked electrical responses to iodine vapor, with high chemical selectivity (>105× over air, methanol, ethanol, and water), fast response (60 s at room temperature), as well as remarkable resistance change (107× at 30 °C for 5 min). The I2 adsorptive sensing is reversible by simple heating in the air enabling the sensor to be used for at least five cycles. In addition, the resistance change is linearly related to the iodine vapor concentration in the whole range tested, making it useful not only for the qualitative detection of iodine leakage but also for quantification. The report here demonstrates that merging EIS and PIMs can be a useful tool for the electrical sensing of gaseous toxins in the environment.
研究领域:
材料科学
·
环境监测
·
化学传感
✓ 已验证
DOI
高影响因子
PLoS One
·
2020
·Vol. 15
·期 12
·e0244297
·
IF 2.74
Jianhui Zhen,Gang Liang,Ruichun Chen,Wenshen Jia
Acetamiprid (ACE) is a kind of broad-spectrum pesticide that has potential health risk to human beings. Aptamers (Ap-DNA (1)) have a great potential as analytical tools for pesticide detection. In this work, a label-free electrochemical sensing assay for ACE determination is presented by electrochemical impedance spectroscopy (EIS). And the specific binding model between ACE and Ap-DNA (1) was further investigated for the first time. Circular dichroism (CD) spectroscopy and EIS demonstrated that the single strand AP-DNA (1) first formed a loosely secondary structure in Tris-HClO 4 (20 mM, pH = 7.4), and then transformed into a more stable hairpin-like structure when incubated in binding buffer (B-buffer). The formed stem-loop bulge provides the specific capturing sites for ACE, forming ACE/AP-DNA (1) complex, and induced the R CT (charge transfer resistance) increase between the solution-based redox probe [Fe(CN) 6 ] 3−/4− and the electrode surface. The change of Δ R CT (charge transfer resistance change, Δ R CT = R CT(after) - R CT(before) ) is positively related to the ACE level. As a result, the AP-DNA (1) biosensor showed a high sensitivity with the ACE concentration range spanning from 5 nM to 200 mM and a detection limit of 1 nM. The impedimetric AP-DNA (1) sensor also showed good selectivity to ACE over other selected pesticides and exhbited excellent performance in environmental water and orange juice samples analysis, with spiked recoveries in the range of 85.8% to 93.4% in lake water and 83.7% to 89.4% in orange juice. With good performance characteristics of practicality, sensitivity and selectivity, the AP-DNA (1) sensor holds a promising application for the on-site ACE detection.
研究领域:
分析化学
·
环境科学
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shan Wang,Zhuorong Hu,Jun Shi,Guokang Chen,Qian Zhang,Zengsheng Weng,Kun Wu,Mangeng Lu
In this work, the lignin, undervalued sustainable biomaterials, was modified and utilized to produce low-defect graphene from pristine graphite by exfoliation in water. The non-covalently interactions between modified lignin (lignin-OH) and graphene were confirmed to improve the dispersion and stability of the nanocomposites. As an additive, the lignin-OH/graphene dispersion was added into waterborne epoxy resin to enhance anti-corrosion of the nanocomposites. By the analysis of the electrochemical impedance spectroscopy (EIS), the nanocomposite coatings displayed higher impedance value at low frequency and bigger phase angle at high frequency with respect to the pure epoxy coatings. By fitting with equivalent circuits, the coating resistance (R c ) and charge-transfer resistance (R ct ) of 0.5% lignin-OH/graphene/WEP coatings are one or two orders of magnitude higher than that of pure epoxy coatings. The better anticorrosion effect should be attributed to well-dispersed graphene with the assistance of lignin-OH which generated the “labyrinth effect” of corrosive route. Therefore, this work provides a new way to enhance anticorrosive ability of waterborne epoxy resin, and it also gives a noteworthy strategy for development of biomaterial lignin's high value-added applications.
研究领域:
材料科学
·
化学工程
·
可持续发展
✓ 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）