Materials Science & Engineering C-Materials for Biological Applications
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2016
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IF 3.42
Hui Mao,Jiachen Liang,Chunguang Ji,Haifeng Zhang,Qi Pei,Yuyang Zhang,Yu Zhang,Yoshio Hisaeda,Xi-Ming Song
Poly(3-(1-vinylimidazolium-3-yl)propane-1-sulfonate) (PVIPS), a novel kind of poly(zwitterionic liquids) (PZILs) containing both imidazolium cation and sulfonate anion, was successfully modified on the surface of polypyrrole/graphene oxide nanosheets (PPy/GO) by covalent bonding. The obtained novel PZILs functionalized PPy/GO nanosheets (PVIPS/PPy/GO) modified glassy carbon electrode (GCE) presented the excellent electrochemical catalytic activity towards dopamine (DA) with high stability, sensitivity, selectivity and wide linear range (40–1220 nM), especially having a lower detection limit (17.3 nM). The excellent analytical performance is attributed to the strongly negative charges on the surface of modified GCE in aqueous solution, which is different from conventional poly(ionic liquids) modified GCE. DA cations could be quickly enriched on the electrode surface by electrostatic interaction in solution due to the existence of SO 3 − groups with negative charge at the end of pendant groups in zwitterionic PVIPS, resulting in a change of the electrons transmission mode in the oxidation of DA, that is, from a typical diffusion-controlled process at conventional poly(1-vinyl-3-ethylimidazole bromide) (PVEIB)/PPy/GO modified GCE to a typical surface-controlled process.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2019
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IF 4.978
Li Jiang,Junaid Ali Syed,Guoli Zhang,Yujie Ma,Jun Ma,Hongbin Lu,Xiangkang Meng
The enhanced corrosion resistance with sustained conductivity are the prerequisites of stainless steel bipolar plates for practical application in proton exchange membrane fuel cell. Herein, we prepare a conductive polypyrrole-graphene oxide/polypyrrole-camphorsulfonic acid bilayer composite coating (PPY-GO/PPY-CSA) on 304 stainless steel bipolar plate by electrodeposition method. The electrochemical tests are conducted in the simulated bipolar plates working environment, the potentiostatic polarization results imply that the PPY-GO/PPY-CSA composite coating offers stable corrosion resistance with low potentiostatic corrosion current density in comparison with the PPY-GO coating. The corresponding electrochemical impedance spectroscopy measurements reveal that the PPY-GO/PPY-CSA composite coating exhibits satisfactory conductivity and displays sustained anodic protection effect with superior anticorrosion performance during the 696 h of immersion. The excellent corrosion protection ability of the PPY-GO/PPY-CSA composite coating owing to its good adhesion strength, compact structure, satisfactory conductivity as well as the synergetic interaction between the two layers of the coating.
研究领域:
材料科学
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电化学
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能源工程
✓ 已验证
DOI
高影响因子
DESALINATION
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2024
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IF 8.3
Ting Shu,Yuliang Zhang,Xiahui Liu,Zhuo Liu,Ying Qin,Fei Wang,Xueting Chang,Dongsheng Wang,Lihua Dong,Xiaobo Chen,Xijia Yin,Zecheng Qian
Solar interfacial evaporation technology is an effective and sustainable method for seawater desalination. It is crucial to achieve high photothermal conversion efficiency, rapid evaporation rate, and long-term stability. In this study, a vertically aligned porous aerogel evaporator is prepared using sodium alginate as the substrate material and graphene oxide (GO) and polypyrrole (PPy) as the photothermal materials through a directional freezing technology. The polypyrrole@graphene oxide-sodium alginate evaporator exhibits a high solar photothermal conversion efficiency as high as 98.6 % and an evaporation rate of up to 4.66 kg·m −2 ·h −1 under 1 sun. During the 144-hour desalination, the evaporator transports brine for evaporation in the daytime and removes salt residue from the evaporator surface at night. It has demonstrated a self-cleaning behavior and restored its desalination stability. Thus, this aerogel evaporator with a high evaporation rate and stable salt resistance shows great potential for practical applications in solar thermal conversion and seawater desalination.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
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2020
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IF 7.333
Hui Jiang,Jun Yang,Kai Wan,Donglei Jiang,Changhai Jin
Sensitive detection of lipopolysaccharides (LPSs), which are present on the outer wall of Gram-negative bacteria, is important to reflect the degree of bacterial contamination in food. For indirect assessment of the LPS content, a miniaturized electrochemical cell sensor consisting of a screen-printed paper electrode, a three-dimensional cells-in-gels-in-paper culture system, and a conductive jacket device was developed for in situ detection of nitric oxide released from LPS-treated mouse macrophage cells (Raw264.7). Nafion/polypyrrole/graphene oxide with excellent selectivity, high conductivity, and good biocompatibility functionalized on the working electrode via electrochemical polymerization could enhance sensing. Raw264.7 cells encapsulated in the alginate hydrogel were immobilized on a Nafion/polypyrrole/graphene oxide/screen-printed carbon electrode in paper fibers as a biorecognition element. Differential impulse voltammetry was employed to record the current signal as-influenced by LPS. Results indicated that LPS from Salmonella enterica serotype Enteritidis caused a significant increase in peak current, varying from 1 × 10–2 to 1 × 104 ng/mL, dose-dependently. This assay had a detection limit of 3.5 × 10–3 ng/mL with a linear detection range of 1 × 10–2 to 3 ng/mL. These results were confirmed by analysis of nitric oxide released from Raw264.7 via the Griess method. The miniaturized sensor was ultimately applied to detect LPSs in fruit juice samples. The results indicated that the method exhibited high recovery and relative standard deviation lower than 2.65% and LPSs in samples contaminated with 102–105 CFU/mL bacteria could be detected, which proved the practical value of the sensor. Thus, a novel, low-cost, and highly sensitive approach for LPS detection was developed, providing a method to assess Gram-negative bacteria contamination in food.
研究领域:
生物化学
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分析化学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Na Wang,Xia Wang,Ying Zhang,Wenjing Hou,Yunzhen Chang,Hua Song,Yun Zhao,Gaoyi Han
The rapid development of personal electronic equipment has stimulated the research upsurge on flexible supercapacitors with high energy density and bending tolerance. Construction of flexible asymmetric supercapacitors can effectively improve the energy density via broadening voltage window. Up to date, most of the asymmetric devices are fabricated by assembling anode, cathode and separator together, which inevitably brings unnecessary mass and volume, and makes the components poorly contacted, and decreases the resistance to repeated bending of devices. To overcome these issues, we design an integrated flexible asymmetric supercapacitor. Continuous gold layers are deposited on the two sides of the porous organic film to form the Au/porous film/Au sandwich structure, and poly(3,4-ethylenedioxythiophene) (PEDOT) and polypyrrole-graphene oxide (PPy-GO) are then electrochemically deposited on two gold layers respectively to serve as the positive and negative electrode material. As expected, the obtained devices expand the operating voltage to 1.2 V when Li 2 SO 4 /polyvinylene alcohol is used as gel electrolyte. The optimal cell possesses energy density of 2.98 μWh cm −2 at 0.12 mW cm −2 , exhibits excellent bending tolerance (capacitance can retain 99.3% of its initial value after 10000 repeated bending cycles). Meanwhile, the devices can be connected in series by simple superposition and light up a light-emitting diode. This flexible integrated device may exhibit potential applications in the future.
研究领域:
材料科学
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能源技术
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纳米技术
✓ 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）