REACTIVE & FUNCTIONAL POLYMERS
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2023
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IF 5.1
Xiaohong Ji,Wenhui Ji,Sepideh Pourhashem,Jizhou Duan,Wei Wang,Baorong Hou
In this study, a self-healing coating with inherent properties of superhydrophobicity and pH-responsibility is introduced through encapsulation of oleic acid and epoxy resin in cellulose acetate nanofibers by electrospinning method, followed by applying a layer of epoxy coating modified with both polydimethylsiloxane and SiO 2 nanoparticles . The prepared core-shell fibers/epoxy coating has a static contact angle of 157.3 ± 3° with sliding angle of 3.5 ± 0.5°, while the electrochemical impedance spectroscopy results demonstrate that the self-healing rate of the scratched core-shell fibers/epoxy coating is 55.65 and 87.10 kΩ cm 2 d −1 after 4 and 12 days soaking in the 3.5 wt% NaCl solution with pH = 12.0 and 4.0, respectively. According to the results of the electrochemical impedance spectroscopy, the corrosion resistance of the core-shell fibers/epoxy coating is remarkably more than the coating without fibers, and the coating with fibers exhibits a significant self-healing performance, excellent wear resistance, and chemical stability. This study would extend the application of the electrospinning technology in the field of superhydrophobic anti-corrosive coatings.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
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2019
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IF 7.466
Pei Yang,Ziqi Zhu,Tao Zhang,Minzhi Chen,Yizhong Cao,Wei Zhang,Xin Wang,Xiaoyan Zhou,Weimin Chen
The realization of long-wavelength emissions and thoroughly understanding of photoluminescence (PL) mechanism are still huge challenges to be addressed for further development of carbohydrate-derived carbon dots (CDs). Herein, novel CDs with excellent green emission were synthesized from a precursor comprising of xylose and m -phenylenediamine in phosphoric acid solution via a simple microwave-assisted hydrothermal method . The PL efficiency was dependent on the combination of different acids and the precursor as well as the synthesis temperature, while the PL properties were mainly related to the acid base environment of precursor. Optical performance and structural characterization revealed that the oxygen-containing groups and protonated amino groups were mainly responsible for the blue and green emission properties, respectively. Moreover, a multi-center fluorescent mechanism on the different PL performances of xylose-derived CDs was proposed and verified by further investigating the pH-dependent PL behaviors. Based on the switching between green and blue emission in different pH regions, the xylose-derived CDs solution was demonstrated to be a promising fluorescent ink for anti-counterfeit printing. This research open a door for value-added utilization of xylose, as well as providing a facile and green strategy for large-scale preparation of CDs.
研究领域:
材料科学
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光学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2024
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IF 5.7
Hui Zhang,Ma Yan,Lina Ma
Background Scintillation cocktails cannot directly measure samples with extreme acidity or alkalinity in β-nuclide liquid scintillation analysis. Plastic scintillation microspheres (PSm), as a novel scintillation material, offer the potential to overcome these limitations by allowing direct mixing with a variety of solutions for measurement, particularly in challenging chemical environments. Results This study evaluated the performance of PSm in various chemical environments, including four acids (nitric, hydrochloric, sulfuric, and phosphoric acids), an alkaline solution (NaOH), a high-salinity solution, and methanol. PSm formed stable mixtures with most solutions and exhibited excellent chemical stability in high-concentration NaOH, with minimal chemiluminescence interference. However, concentrated nitric and sulfuric acids caused chemical reactions with PSm, leading to discoloration and potential color quenching. Efficiency calibration was performed using ultrapure water, allowing for accurate measurement of 14 C activity across different solutions with simple efficiency corrections. Significance The findings of this study highlight the advantages of PSm for β-nuclide measurement in a variety of complex chemical environments. PSm's stability in highly acidic, alkaline, and saline conditions makes it a promising tool for applications such as radioactive waste monitoring and pharmacokinetic research, providing a reliable and efficient alternative to conventional scintillation cocktails.
研究领域:
核医学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Tingting Fan,Jinlei Miao,Zhenhuan Li,Bowen Cheng
The separation of water-in-oil emulsions in harsh environment (strong acid/alkali) is a challenging subject. In this study, we prepared a superhydrophobic-superoleophilic polyphenylene sulfide (PPS) membrane by the mixture of hydrophobic SiO 2 nanoparticles, diphenyl ketone (DPK), benzoin (BZ) and PPS via thermally induced phase separation (TIPS) technology. This superhydrophobic membrane displayed a lotus leaf-like micro-nano structure, and it could be used for oil/water separation in strong acidic or alkaline environment. The hydrophobic SiO 2 nanoparticles played a key role in the membrane structure evolution and its performance. When SiO 2 content was 4 wt%, the pure water contact angle of the prepared superhydrophobic-superoleophilic membrane reached 156.9° and the oil contact angle achieved 0°. The fluxes of water-in-oil emulsions (kerosene, toluene and chloroform) reached 1926, 3150 and 3416 L/(m 2 ·h), respectively. However, the fluxes of their surfactant-stabilized water-in-oil emulsions declined to 531, 685 and 724 L/(m 2 ·h), respectively, due to the great stability of surfactant-stabilized emulsions. Most importantly, all the water rejection rates exceeded 99.9% when the PPS membranes modified with 4 wt% hydrophobic SiO 2 nanoparticles. In addition, the PPS-SiO 2 hybrid membranes exhibited excellent self-cleaning antifouling performance, cycling performance and superior acid/alkali resistance.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Qingyong Li,Fulei Wang,Yuxiang Hua,Yuting Luo,Xiaoheng Liu,Guorong Duan,Xujie Yang
A series of novel visible-light-driven Ag/Ag 3 PO 4 /WO 3 (AAPW) Z-scheme heterostructures were fabricated using a facile deposition-precipitation method followed by photo-reduction without adding any surfactant . To explore more deeply about the photocatalytic activity of AAPW nanocomposites under neutral and strongly acidic/alkaline conditions, we investigated their photocatalytic rhodamine B (RhB) efficiency at different pH value that was controlled by adding HNO 3 or NaOH aqueous solution. It was found that as-prepared AAPW photocatalysts showed enhanced photocatalytic RhB efficiency under neutral and even strongly acidic/alkaline environment. The process of charge carrier separation and transfer in the AAPW nanocomposites and Z-scheme mechanism for RhB degradation were described in sufficient detail based on systematical characterizations and measurements. The silver particles introduced to build AAPW Z-scheme structure should contribute to more efficient charge separation, resulting in enhanced photocurrent response and photocatalytic activity . We expect that this work will provide systematic study concerning Z-scheme Ag/Ag 3 PO 4 /WO 3 structure, and fulfill the research about photodegrade activity of catalyst under strongly acidic/alkaline conditions.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）