ACS Applied Nano Materials
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2024
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IF 5.3
Yajie Chen,Wenchao Zhang,Jianyong Xu,Qi Liu,Wei Shi,Wang Tang
The development of nanoenergetic materials with adjustable reaction performance is the key to achieving controllable ignition and propulsion. It has become one of the research hotspots of scientists in the field of energetic materials. Due to its excellent combustion performance and good film-forming properties, the Al/PVDF energetic system with controllable reactivity has a wide application potential for ignition and propulsion. In this work, an Al@PTA/PVDF nanoenergetic film with tunable performance was successfully prepared by in situ coating a polytannic acid (PTA) interface on the surface of Al nanoparticles (nAl) and a composite assembly with polyvinylidene fluoride (PVDF). The differential scanning calorimetry results show that the main exothermic peak of the Al@PTA/PVDF film is 7.0 °C higher than that of the pure Al/PVDF nanoenergetic film when the coating thickness of the PTA interface is adjusted, and the PTA interlayer can also change the reaction mode of nAl and PVDF to a multiband exothermic. In addition, with the thickening of the PTA interface, the activation energy of the Al@PTA/PVDF film increases from 270.2 to 316.1 kJ/mol, and its average burning rate gradually decreases to 152.68 mm/s. These results indicate that the PTA interface can better control the combustion reaction of Al/PVDF, which will promote its application in the field of controllable combustion and controllable propulsion. It is concluded that the degree of contact and the diffusion length of mass transfer between the reaction components can be changed by introducing an intermediate nanolayer between the fuel and the oxidant, which allows the combustion performance of various composite energetic materials to be adjusted.
研究领域:
能材料
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燃烧科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
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2024
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IF 3.7
Wei Ren,Qiuying Gao,Yujie Guo,Changhua Li,Xiaoyu Mao,Haijiao Sun,Yi He,Yang Bai
The introduction of poly(tannic acid) (PTA) and cerium ion [Ce(III)] on the surface of α-zirconium phosphate (α-ZrP) endowed the α-ZrP@PTA-Ce(III)/waterborne epoxy composite coating with enhanced corrosion protection and wear resistance performances. The successful preparation of α-ZrP@PTA-Ce(III) was confirmed through X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectra. PTA improved the compatibility between α-ZrP@PTA-Ce(III) and the waterborne epoxy resin due to the presence of organic groups from tannic acid. The wear resistance test indicated that the incorporation of α-ZrP@PTA-Ce(III) effectively reduced the coefficient of friction and the wear rate. Electrochemical impedance spectroscopy was used to analyze the corrosion protection performance of unbroken coatings and the self-healing ability of scratched coatings. The incorporation of α-ZrP@PTA-Ce(III) improved the protection performace distinctly. In addition, α-ZrP@PTA-Ce(III) endowed the composite coating with dual corrosion inhibition effects, originating from the PTA film, to prevent the penetration of corrosive media and a dense film that came from the Ce(III) cation. The waterborne epoxy system with enhanced corrosion and wear resistance in this paper broadens the application of α-ZrP.
研究领域:
材料科学
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腐蚀科学
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表面工程
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高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2024
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IF 4.1
Wenjin Li,Wanting Zhao,Qizhen Luo,Wenzhe Xiao,Xiaoning Wang,Yuting Shi,Jian Sun
High photogenerated carrier recombination inhibits the widespread application of graphite-phase carbon nitride (g-C 3 N 4 ). Construction of junctions is an effective strategy but still under challenges, such as tedious procedure and limited efficiency. Herein, WO x /1D g-C 3 N 4 /2D g-C 3 N 4 multi-junction with enhanced separation of photogenerated carriers was one-pot integrated through in-situ “PTA-Mel” ionic microenvironment by mixing phosphotungstic acid (PTA) and melamine (Mel). Protonated Mel by PTA contributed to the formation of 1D g-C 3 N 4 and the decomposition of [P(W 3 O 40 ) 4 ] 3- produced WO x . 1D g-C 3 N 4 and WO x with oxygen-vacancy deficient provided channels and caves for photoelectrons transfer, respectively. Compared with pure g-C 3 N 4 , the degradation rate constants of Rh B and tetracycline hydrochloride (TC) by WO x /1D g-C 3 N 4 /2D g-C 3 N 4 are 2.34 and 1.45 times high respectively due to the excellent visible light absorption and improved photogenerated carrier separation. This method could be extended to the design of multiple heterojunctions in one photocatalyst through a facile process.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Lirong Yang,Chuanqun Huang,Xuan Luo,Lin Zhang,Yongjie Ye,Hui Jun,Yan Wang
Due to the high swelling ratio, the use of chitosan-based composites for adsorption of U(VI) from wastewater is limited. To overcome this shortcoming, a novel type of hierarchical porous chitosan-based aerogel (CS-PTA-DMAs) with anti-swelling is successfully prepared via cross-linking chitosan with the cross-linker PTA-DMA, which is synthesized by p-phthalaldehyde (PTA) and 3,5-diaminobenzoic acid (DMA). There is no significant volume expansion of the aerogel after soaking in ultrapure water for 1 week, indicating it has good swelling property. In addition, the CS-PTA-DMA aerogel has a high U(VI) adsorption capacity of 160 mg/g (308 K, pH 6). The adsorption behavior of CS-PTA-DMA to U(VI) is coordinate to the pseudo-second-order kinetic model and Freundlich isothermal model, which is spontaneously endothermic. Moreover, the adsorption mechanism is also investigated in details. These findings are crucial for the development of practical application uranium adsorbents.
研究领域:
环境科学
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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
ENERGY
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2024
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IF 9
Bingbing Qiu,Jicheng Shi,Wei Hu,Yanfang Wang,Donghui Zhang,Huaqiang Chu
Hydrothermal liquefication of biomass to produce high-quality chemicals and liquid fuels is considered as a renewable and sustainable technology. Herein, a one-step hydrothermal method was used to prepare microcrystalline cellulose supported carbon-based catalyst PTA-BC with the activation factor of phosphotungstic acid. It was demonstrated by Py-FTIR, NH 3 -TPD and XPS that PTA-BC is not only rich in functional groups but also contains Brønsted acid sites (hydroxyl groups) and Lewis acid sites (C C, carboxyl groups). After experimental optimization, the optimum yield of furfural obtained from xylose catalyzed by PTA-BC was 81.02% at the reaction temperature of 180 °C and the reaction time of 20 min. The results show that PTA-BC contains –COOH, –OH and C C as catalytic sites and that the synergistic effect of these functional groups. The nature of the reaction solvent, appropriate reaction temperature and residence time are the main reasons for the good catalytic performance. This work provides a promising way for the synthesis of solid acid catalyst, which has a wide application prospect for the production of furfural.
研究领域:
化学工程
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催化
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可再生能源
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生物质转化
✓ 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）