JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Lingling Zhang,Hui Jia,Jie Wang,Haitao Wen,Juan Li
The electrochemical impedance spectroscopy (EIS) was used to monitor the ion transport of the ion exchange membrane (IEM) interface with ectopic monitoring. But the general monitoring methods were lack of the information in concentration polarization (CP) and fouling formation. In this paper, an in-situ method for monitoring the ion mass transfer by EIS was established which can distinguish the contribution of membrane fouling and CP. The results showed that the in-situ EIS could more comprehensively monitor the desalination process. Membrane fouling, especially the formation of fouling layer on membrane surface, promoted the CP at membrane/solution interface. This was mainly because the ion mass transfer was hindered by serious membrane fouling, so that the ion concentration near the membrane surface was higher than that of the solution, and this phenomenon was gradually aggravated with the increase of membrane fouling. The recovery of membrane performances were assessed by different cleaning methods, it was found that the chemical cleaning effect was superior to inverted electrode according to online EIS. When irreversible fouling was formed in the membrane and then the fouled membrane was chemically cleaned, the formation of the fouling layer was accelerated and the CP was aggravated during membrane reuse.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Yaosheng Liu,Hanmeng Liu,Zhixia Yao,Yongxing Diao,Guangxing Hu,Qifang Zhang,Yujing Sun,Zhuang Li
pH electrodes exhibited wide applications in the fields of food science, environmental science, and bioanalytical analysis. In this work, we demonstrate the facile fabrication of silver-antimony (Ag–Sb) binary alloy electrodes through a one-step melt casting method. XRD, SEM and EDS were used to characterize the alloy electrodes. The response mechanism of the pH electrode was studied by Tafel plots, which clarified the role of metal (Sb) and metal oxide (SbO ads ) in the pH response process. The corrosion resistance of the alloy electrode was researched by electrochemical impedance spectroscopy (EIS), which proved the advantages of the Ag–Sb alloy electrodes. In addition, our Ag–Sb pH electrodes exhibited promising sensing performance with the near-Nernstian response sensitivity is 54.6 mV/pH. The other performances including response time, stability, reversibility, hysteresis, and temperature coefficient, also demonstrated that the Ag–Sb binary alloy electrodes have good pH speciality, and it will potential applications for environmental monitoring in situ. These research results can complement and perfect the theoretical basis of metal/metal oxide pH electrodes, thus guiding the preparation of metal/metal oxide pH electrodes and promoting the exact and extensive application of metal/metal electrodes in more aspects.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
·
2017
·Vol. 68
·期 12
·1355-1364
·
IF 1.26
P. He,J.-X. Wang,Q. Ma,F.-Y. Lu,Z. Wang,S.-C. Wang
It is very important to develop high performance composite coatings for efficient protection of metals from corrosion. In this work, high performance protection coatings on mild steel using epoxy as matrix containing polyaniline (PANI) and a newly developed laminar basalt (LB) were prepared and characterized. The contact angle, water absorption, adhesion strength, and passive property of the coating were also evaluated. The protection ability of these coatings on mild steel, exposed to 12 wt% sodium chloride (NaCl), 10 wt% sodium hydroxide (NaOH), and 10 wt% hydrochloric acid (HCl) solutions were monitored using electrochemical impedance spectroscopy (EIS), respectively. In neutral solution, the coating containing both PANI and LB (C-PANI-LB) offered very high corrosion protection performance and its impedance at 0.01 Hz was higher than 4.1 × 10 10 Ω · cm 2 after immersed for 60 days. However, in alkaline or acidic solution, C-PANI-LB behaved poorer than pure epoxy coating or PANI contained coatings, which were ascribed to the hydrolysis of LB and deterioration of the epoxy binder in these media.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
eTransportation
·
2021
·
IF 0
Yu Leng,Daijun Yang,Pingwen Ming,Cunman Zhang
Reliable assessment of corrosion resistance is critical in seeking the appropriate materials for bipolar plate (BPP) while corrosion of BPP still remains a key challenge in proton exchange membrane fuel cell (PEMFC). In this work, the effects of accelerated and simulated testing conditions as well as potential on corrosion behaviours and microstructure evolutions of stainless steel bipolar plate are studied with SS316L by potentiodynamic and potentiostatic tests, and electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Moreover, the rationalities of evaluating corrosion resistance of materials for BPP under accelerated and simulated testing conditions with different potentials are analyzed based on electrochemical tests and corrosion mechanisms of SS316L. The results reveal that pitting is the main corrosion mechanism for SS316L in the simulated or real PEMFC working conditions. However, the dominant corrosion mechanisms are changed to intergranular and uniform corrosion at the potentials of 1.15 V–1.55 V (vs. SHE), respectively, when tests are performed in accelerated conditions with pH = 0.3. The results indicate that the accelerated conditions may be inappropriate for evaluating corrosion resistance of materials for BPP, especially at higher potentials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Wenjing Liu,Xin Zhang,Yujie Qiang,Guangming Lu,Xijian Lan,Bin Chen,Haichao Zhao
Ureidopyrimidinone-containing Poly(amino ester) (UPy-D400-PEGDA) was synthesized by the Michael addition reaction of Poly(ethylene glycol) diacrylate and polyether amine grafted 2-ureido-4[1H]-pyrimidinone motifs, and its corrosion inhibition efficiency on Q235 steel in 1 mol/L HCl medium was studied by polarization curve and electrochemical impedance spectroscopy , as well as corrosion product analysis. UPy-D400-PEGDA is a mixed-typed corrosion inhibitor that mainly suppressed the cathode, can form a protective film on the surface of mild steel to suppress the corrosion of oxygen and chlorine in acid medium. Corrosion inhibition efficiency was gradually enhanced with the increase of the concentration of UPy-D400-PEGDA. The corrosion inhibition efficiency reaches 98.80% when the inhibitor concentration is 500 mg/L. The surface roughness of mild steel in 1 mol/L HCl solution without UPy-D400-PEGDA was 3.891 μm, while the roughness of mild steel with UPy-D400-PEGDA concentration of 500 mg/L was only 0.636 μm. The inhibition mechanism was elucidated using quantum chemical calculation.
研究领域:
材料科学
·
腐蚀与防护
·
量子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shengjie Liang,Mengyuan Hu,Baoe Li,Dan Xia,Chunyong Liang,Feng Peng,Donghui Wang
Bacterial infections around implants constitute a significant cause of implant failures. Early recognition of bacterial adhesion is an essential factor in preventing implant infections. Therefore, an implant capable of detecting and disinfecting initial bacterial adhesion is required. This study reports on the development of an intelligent solution for this issue. We developed an implant integrated with a biosensor electrode based on alternating current (AC) impedance technology to monitor the early growth process of Escherichia coli (E. coli) and its elimination. The biosensor electrode was fabricated by coating polypyrrole (PPy) doped with sodium p-toluenesulfonate (TSONa) on titanium (Ti) surfaces. Monitoring the change in resistance using electrochemical impedance spectroscopy (EIS), combined with an equivalent circuit model (ECM), enables the monitoring of the early adhesion of E. coli. The correlation with the classical optical density (OD) monitoring value reached 0.989. Subsequently, the eradication of bacteria on the electrode surface was achieved by applying different voltages to E. coli cultured on the electrode surface, which caused damage to E. coli. Furthermore, in vitro cellular experiments showed that the PPy coating has good biocompatibility and can promote bone differentiation.
研究领域:
生物医学工程
·
材料科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
Coatings
·
2020
·Vol. 10
·期 2
·128
·
IF 2.436
Qingjun Zhu,Binbin Zhang,Xia Zhao,Binbin Wang
Given the corrosion tendency of the natural oxide film of aluminum alloys, micro arc oxidation (MAO) treatment is used as an efficient and economic method to enhance the corrosion resistance. However, irregular voids, pores, and micro cracks are easily formed during the MAO process, which are harmful to the anti-corrosion property of MAO coatings. In this paper, binary additives of electrolytes, including (NaPO3)6and H3BO3, were used to obtain MAO coatings with improved thickness and compact microstructures on 6061 aluminum alloys. The as-prepared coatings were investigated using a thickness meter, scanning electron microscope (SEM), X-ray diffractometer (XRD), and electrochemical impedance spectroscope (EIS). The results showed that the coordinated influence of the binary additives could change the discharge behaviors and micro morphologies of the MAO coatings compared to the base silicate electrolyte. A thicker and stronger MAO coating could be achieved, which was mainly composed of Al2O3phases. The EIS tests revealed that the corrosion current density of the obtained optimal MAO coating decreased by three orders of magnitude from 1.209 × 10−6A·cm−2to 2.981 × 10−9A·cm−2. We believe that the binary additive-enhanced MAO coatings could provide a promising anti-corrosion solution in various applications.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Shuxin Li,Daxin Zhang,Rongxi Zhu,Tengchong Ma,Meilin Liu,Luyao Ma,Yili Wang
Coagulation conditioning is a key step for sludge dewatering, while the control of optimal coagulant dosing is still a challenge. This study proposes an intelligent system for the precise management of coagulants (IIS PMC ) in sludge conditioning. This system was assembled using an electrical impedance spectroscopy (EIS)-based sensor and a decision-making model to conduct the self-perception, decision-making, execution, and dosage optimization in sludge conditioning through a feedback-driven exploratory trial process, conceptually inspired by structured exploration behavior observed in primates. Using the optimal dosage obtained by the traditional manual jar test as the reference, the accuracy and repeatability of the IIS PMC were investigated. The robustness under different perturbed conditions, reliability, and generalizability of the IIS PMC were further assessed. Moreover, the long-term operational capability and the feasibility of the application in the scaled-up conditioning were also discussed. The results showed that the intelligent system achieved statistical median accuracy and repeatability of approximately 5%, good reliability with a 5 g/kg resolution (R 2 > 0.94 in validation tests) in determining the optimal coagulant dosage, and strong robustness under sludge conductivity and concentration perturbed conditions. In addition, the performance of the IIS PMC was validated across different sludge sources, including activated sludge, dredged sediment, and algal sludge, as well as different coagulants, exhibiting solid generalizability. The system also demonstrated stable continuous operation over 40 batches, which is equivalent to the number of continuous operation batches of a small-sized treatment plant over approximately half a month. Furthermore, even after scaling up the conditioning tank, the IIS PMC maintained stable performance. These findings highlight the potential of the IIS PMC for practical applications in sludge conditioning.
研究领域:
环境工程
·
人工智能
·
生物启发系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 87
·期 2
·464-477
·
IF 1.745
Ye Yuwei,Liu Wei,Liu Zhiyong,Zhang Dawei,Zhao Haichao,Wang Liping,Li Xiaogang
Novel electroactive sol–gel hybrid coatings were synthesized by hydrolysis and condensation reaction of tetraethoxysilane (TEOS) and different mass ratios of silane-capped aniline trimer (TSUPQD) on the surface of Q235 steel. Microstructure, thermal stability, and corrosion resistance of as-prepared hybrid coatings were characterized by FTIR, UV–Vis, SEM, TGA, CA measurement, polarization curve, and electrochemical impedance spectroscopy. It could be seen that the i corr value of as-prepared novel coating was markedly lower than those of pure TEOS-based coating and bare substrate. EIS results indicated that the impedance of hybrid coating was higher than that of Q235 steel substrate, indicating the effective protective property for substrate. Meanwhile, the aniline trimer-based hybrid coatings presented much higher impedance after immersion in 3.5 wt% NaCl for 200 h, and the best corrosion performance was acquired when the mass ratio of TEOS/TSUPQD is 100:4. The XRD and SEM analysis of the corrosion product beneath the hybrid coatings showed that the redox catalytic capability of aniline trimer could induce the Q235 substrate to form the passive films which mainly consisted of Fe 2 O 3 and Fe 3 O 4 .
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2021
·
IF 7.205
Tong Liu,Haichao Zhao,Dawei Zhang,Yuntian Lou,Luyao Huang,Lingwei Ma,Xiangping Hao,Liang Dong,Federico Rosei,Woon Ming Lau
Combining a fast self-healing action and a high barrier property remains a challenge in polymeric protective coatings. Herein, we report an intrinsic self-healing epoxy coating in which 2-ureido-4[1H]-pyrimidinone (UPy) as a quadruple hydrogen bonding unit, grafted onto the backbones of an epoxy-matrix by an amine-terminated oligo(propylene glycol) linker. Without any intervention, the epoxy-matrix performs its self-healing function in ∼5 min, even under aqueous immersion. Besides, electrochemical impedance spectroscopy measurements demonstrate corrosion protection ability of such self-healed coating on a steel substrate, with a high |Z| 0.01Hz value of 4.8 × 10 10 Ω·cm 2 after 60 days of immersion in NaCl solution.
研究领域:
材料科学
·
腐蚀与防护
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Bhaskar Jyoti Deka,Jiaxin Guo,Pak Wai Wong,Noman Khalid Khanzada,Jehad A. Kharraz,Chi-Wing Tsang,Alicia Kyoungjin An
Wetting of hydrophobic membranes is considered to be one of the major limitations that must be overcome to further the development of membrane distillation technology. Low surface tension liquids can induce wetting, which can significantly affect permeate conductivity after the complete wetting of the membrane pores. In this study, a thin conductive hydrophobic polyaniline (PANI) layer was sandwiched between two nonconductive polyvinylidene fluoride (PVDF) layers by the phase inversion method. The surface of this PANI-PVDF membrane was then electrosprayed with polytetrafluoroethylene to impart superhydrophobicity (water contact angle, ∼160°). Finally, the wetting of membranes was monitored and detected during direct contact membrane distillation of a low surface tension saline feed containing sodium dodecyl sulfate by electrochemical impedance spectroscopy. Compared with measuring conductivity of the permeate side, we found that measuring the cross-membrane impedance at a constant frequency (100 kHz) demonstrated more precise detection and a superior ability in distinguishing different stages of wetting and their intrusion. Further, our experiments demonstrated the possible strategies to elude membrane wetting by flushing distilled water periodically.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 16
·167502
·
IF 3.721
Yanjie Zheng,Yichun Xu,Li Chen,Xinyang Yin,Fei Lin,Shaohuang Weng,Xinhua Lin
In this study, a novel dual-modal electrochemical impedance spectroscopy (EIS) and electrochemiluminescence (ECL) biosensor for sensitive detection of femtomolar miRNA-126 was developed based on hybridization chain reaction (HCR). The capture unit was Fe3O4@SiO2@AuNPs-cDNA, being Fe3O4@SiO2@AuNPs nanoparticles coated by hairpin cDNA which could capture miRNA-126 specifically. The signal unit was HCR-Ru(phen)32+, which was a long double-stranded DNA obtained through HCR with a great number of ECL signal labels Ru(phen)32+ embedded. In presence of target miRNA-126, stem-loop structure of cDNA in the capture unit was opened and a partial dsDNA was formed, the residue bases of which hybridized with the signal unit to form a capture unit/miRNA-126/signal unit complex on the electrode surface. In this case, dual-modal biosensor was prepared easily by the help of magnet, and EIS and ECL detection was both acquired. In addition, a miRNA-126 molecule corresponded to a long double-stranded DNA and a large amount of Ru(phen)32+ ions embedded, so the electrochemical impedance and the ECL intensity were greatly increased, with a limit of detection (LOD) of 2 fM. And, EIS and ECL results could be checked mutually, improving the detection accuracy and reliability. It offers a simple, fast, sensitive, selective and accurate approach for versatile analysis of microRNAs.
研究领域:
生物传感器技术
·
分子诊断学
·
纳米医学
✓ 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）