JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2011
·Vol. 323
·期 23
·3087-3091
·
IF 1.69
L.D. Zhang,W.L. Liu,C.L. Xiao,J.S. Yao,Z.P. Fan,X.L. Sun,X. Zhang,L. Wang,X.Q. Wang
The use of a block copolymer , poly (styrene)-b-poly (acrylic acid) (PS-b-PAA) to prepare a magnetic nanocomposite was investigated. Poly (styrene)-poly ( t -butyl acrylate) block copolymer , being synthesized by atom transfer radical polymerization , was hydrolyzed with hydrochloric acid for obtaining PS-b-PAA. The obtained PS-b-PAA was then compounded with the modified γ-Fe 2 O 3 , and subsequently the magnetic nanocomposite was achieved. The products were characterized by 1 H NMR, FTIR , gel permeation chromatography , thermogravimetric analysis , transmission electron microscopy and vibrating sample magnetometer . The results showed that the nanocomposites exhibited soft magnetism , with the mean diameter of 100 nm approximately.
研究领域:
材料科学
·
高分子化学
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纳米复合材料
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磁性材料
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Inorganic Chemistry Frontiers
·
2022
·Vol. 10
·期 3
·804-814
·
IF 7.779
Hu Yao,Yinan Zheng,Siliang Yue,Songjie Hu,Wenyu Yuan,Xiaohui Guo
The oxygen evolution reaction (OER) has slow chemical dynamics in the electrochemical decomposition of water. Herein, we demonstrate that B-site substitution engineering on ABF3 is an efficient strategy to boost the OER activity due to the modified electronic structure. A series of perovskite fluorides with the formula NaCo1−2xFexNixF3 were fabricated via a simple hydrothermal process, in which Co was partially substituted by both Fe and Ni. The optimized perovskite fluoride exhibited a low overpotential of 265 mV at a current density of 10 mA cm−2 and outstanding electrochemical stability after 100 h continuous electrocatalysis for the OER. These results are superior to the state-of-the-art perovskite-based OER catalysts. The X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) results showed that the dual-substitution of Fe and Ni atoms not only produced higher valence Co3+ ions but also generated the more active species Fe3+. In addition, the produced metal oxyhydroxides (MOOH, M = Co, Fe, Ni) on the catalyst surface during OER activation could contribute both excellent catalytic activity and ultralong stability.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 3
·e202200313
·
IF 1.8
Xiang-Dong Meng,Shui-Zhou Cai
In this study, the Al-B-Mo alloy powders with a boron content of 7 wt % and Molybdenum content of 0.5–3 wt % were prepared by the close-coupled gas atomization. The powder morphology, phase composition, oxidation, and exothermic behavior of combustion were characterized. The results show that the addition of Mo effectively improves the energetic properties of the alloy powder, with the mass-burning enthalpy of Al-7B-1Mo reaching 31111 J/g, exceeding the theoretical mass-burning enthalpy of monolithic Al (31000 J/g). Al-7B-1Mo underwent a violent exothermic process at around 1000 °C, and the oxidation weight gain ratio and oxidation efficiency reached 46.16 % and 48.05 % respectively, an increase of 19.75 % and 21.08 % compared to Al-7B. The mesh structure formed by the AlB 2 phase on the particle surface positively promoted the particles′ thermal oxidation. Mechanical mixtures of AlB 2 /Mo and AlB 2 /MoO 3 were prepared and the catalytic promotion of the combustion of AlB 2 by Mo and MoO 3 was confirmed by thermal tests of combustion. The mechanism by which Mo/MoO 3 promotes the combustion of AlB 2 was investigated through the phase composition characterization of the composite powder after heat treatment in argon and air atmosphere. It was confirmed that MoO 3 promotes the oxidation and combustion of AlB 2 by supplying oxygen to B in AlB 2 , while Mo is first oxidized to MoO 3 , which then promotes the combustion of AlB 2 .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 4
·1-19
·
IF 2.8
Yao Bingdong,Zheng Guangwei,Luan Yina,Wang Lingxu,Xing Xuemin,Wang Yangyang,Liu Yan,He Jingxian,Zhang Fengqing
The morphology-controlled synthesis of nanostructured photocatalysts by an environmentally friendly and low-cost method provides a feasible way to realize practical applications of photocatalysts. Herein, Bi 2 WO 6 (BWO) nanophotocatalysts with mulberry shape, sheet-like, and round-cake morphologies have been successfully synthesized through a highly facile solvothermal process by simply adjusting the solvothermal temperature or utilizing selective addition of ethylene glycol as an orientation agent without using strong acids and bases and/or hazardous chemicals. The ratio of ethylene glycol and glacial acetic acid can affect the morphology and oxygen vacancy content of BWO, thereby influencing the photocatalytic performance. The photocatalytic activity of the as-prepared samples was evaluated by degradation of rhodamine B (RhB) and tetracycline under visible-light irradiation. The results indicated that all the BWO samples exhibited morphology-associated photocatalytic activity, and the sheet-like structure of BWO obtained via solvothermal treatment at 120 °C with ethylene glycol and glacial acetic acid ratio of 1:3 achieved the maximum specific surface area and possessed abundant oxygen vacancies, exhibiting outstanding photocatalytic activity for degradation of RhB and tetracycline. The degradation rate of RhB reached 100% within 20 min. To the best of our knowledge, this value is one of the most remarkable values for pristine BWO photocatalysts. Radical capture experiments demonstrated that hydroxyl radicals (·OH) play major roles compared with electrons (e − ) and holes (h + ) in the photocatalytic degradation process. A possible mechanism for the photocatalytic degradation of pollutants was proposed to better understand the reaction process. We believe that the more economical, efficient and greener methodology can provide guidance to develop highly efficient photocatalysts with favourable morphology and structure.
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Materials Advances
·
2022
·Vol. 3
·期 4
·2185-2190
·
IF 0
Ping Li,Mengyou Gao,Lei Sun,Huizhong Xu,Xiaochen Dong,Jianjian Lin
Coating a few layers of MoS2 nanosheets on a substrate is an effective approach to enhance catalytic activity for photocatalytic degradation. Herein, we fabricated heterostructured TiO2/MoS2 (H-TiO2/MoS2) with high structural stability via a simple two-step solvothermal approach. H-TiO2/MoS2 was composed of TiO2 as a hard core and MoS2 nanosheets as a shell, which could increase the electron transfer rate between TiO2 and MoS2 and enable active edge sites of MoS2 to be maximally exposed. Besides, H-TiO2/MoS2 indicated enhanced light absorption in the UV to Vis range when compared to TiO2 nanoparticles, and slightly lower than that of MoS2. This is beneficial for the enhancement of the photocatalytic degradation performance. Therefore, H-TiO2/MoS2 displayed a strong adsorption ability toward organic dyes and showed excellent performance in the photocatalytic degradation of rhodamine B with the concentration decreased by 99.4% due to the synergistically stimulative effect. The work will enlighten the development of highly efficient molybdenum sulfide-based heterostructured photocatalysts.
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Frontiers in Microbiology
·
2022
·
IF 6.064
Olasunkanmi Oluwatayo Israel,Mageto James,Avala Ntsigouaye Juval,Yi Ming,Fei Yanru,Chen Yang,Chen Sijia,Xu Weizhen,Lin Lexun,Zhao Wenran,Wang Yan,Zhong Zhao-Hua
Coxsackievirus group B (CVB) is a member of the genus Enterovirus in the family Picornaviridae. CVB infection has been implicated as a major etiologic agent of viral myocarditis, dilated cardiomyopathy, meningitis, and pancreatitis among children and young adults. Until date, no antiviral agent has been licensed for the treatment of Coxsackievirus infection. In an effort to identify antiviral agents against diseases caused by the CVB, we found that ethyl 3-hydroxyhexanoate (EHX), a volatile compound present in fruits and food additives, is a potent antiviral compound. In this study, we demonstrated that EHX treatment significantly inhibits CVB replication both in vivo and in vitro. Furthermore, EHX possesses antiviral activity at 50% effective concentration (EC50) of 1.2 μM and 50% cytotoxicity (CC50) of 25.6 μM, yielding a selective index (SI) value as high as 20.8. Insights into the mechanism of antiviral activity of EHX showed that it acts at the step of viral RNA replication. Since EHX has received approval as food additives, treatment of CVB-related infections with EHX might be a safe therapeutic option and may be a promising strategy for the development of semi-synthetic antiviral drugs for viral diseases.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Xiuli Shao,Siqi Wang,Youhui Zhou,Xuan Zhang,Haizhou Tian,Zheng Wang,Zhong-Yong Yuan,Huanting Wang
The ZSM-5 zeolite nanosheets are highly desired materials for catalytic reactions and membrane separation . Their synthesis depends on specially designed complex surfactants ; however, the high-cost limits their large-scale industrial production. Herein, the tailored synthesis of coffin-shaped multilamellar ZSM-5 composed of orderly stacked 2D nanosheets is carried out using cetyltrimethylammonium bromide (CTAB) as a structure-directing agent (SDA) in the presence of silicalite-1 seed sol. The morphology and b -axis thickness of nanosheets is controlled by adjusting the amount of silicalite-1 seed sol, CTAB/TEOS ratio, SiO 2 /Al 2 O 3 ratio, and synthesis time. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis indicate that the hydrophobic tail of CTAB acts as an inhibitor, effectively preventing the continuous growth along b -direction with an average thickness of 20–100 nm. This work highlights the role of silicalite-1 seed sol and CTAB in the orderly stacked sheets growth process. This crystallization strategy opens a facile and inexpensive approach for multilamellar ZSM-5 zeolite fabrication with 2D-nanosheets structures, and their practical applications in catalytic conversions of bulky molecules.
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Journal of Energetic Materials
·
2022
·
IF 2.421
Shu-Ji Wang,Di Wang,Ping Liu,Xiao-le Sun,Shi Yan,Xue-Yong Guo
TKX-50, as a representative of a new nitrogen-rich energetic compound, has attracted extensive interests due to its high energy and low sensitivity properties. As an important energetic material, combustible agent has great influence on improving the energy level of explosives and propellants. Boron powder has become the most potential combustible agent in energetic fields because of its unique performances. In this work, nano-boron-based microspheres containing TKX-50 are directly fabricated by electrospray deposition. The prepared microspheres showed high monodispersity with particle size ranging from ~1–3 μm. Thermal behavior results show that the mass gain of the electrostatically sprayed sample is 163.3%, which is much higher than that of pure boron and physically mixed samples. Combustion behavior tests show that electrosprayed microspheres exhibit outstanding performance in comparison to physical mixed sample, the peak pressure improved by 85%, the burning time decreased by 21% and the pressurization rate improved by 136%. These excellent properties are probably related to their uniform microstructure. Therefore, electrospray preparation of microspheres with controllable structure has a good application prospect in energetic materials.
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Materials Today Communications
·
2021
·
IF 3.383
Lei Hou,Chenyang Xie,Mohan Di,Hongzan Song,Yanfang Liu,Ming-tao Run
In order to prepare white fluorescent polymer materials, poly(ethylene succinate- co -cyclohexane dimethanol) (PESC) emitting blue fluorescence and poly (butylene terephthalate- co -propylene terephthalate) (PBTT) modified with 1,6,7,12-tetrachloroperylene tetracarboxylic acid dianhydride (TTAD) are prepared individually by melt polycondensation. Then the two polymers were linked to form a block polymer PESC- b -PBTT by chain extension reaction. The chemical structure, fluorescence emission and crystallization melting behavior of copolyesters are characterized by nuclear magnetic resonance (1H NMR), fluorescence spectrophotometer and differential scanning calorimetry (DSC). The effect of the ratio of PESC and PBTT in PESC- b -PBTT on the fluorescence properties of the products is discussed. The results shows that the fluorescence color of the material can be controlled by adjusting the proportion of each block in the PESC- b -PBTT copolymer. When the PESC’s content reaches 85wt%, the product emits white fluorescence which can be controlled by isothermal crystallization. Attributed to the increase of crystallinity and crystal size caused by the rise of isothermal crystallization temperature, blocking the energy transfer of blue light unit to orange light unit, the fluorescence of the sample turns to cool white gradually.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 4
·4209-4215
·
IF 3.056
Tong Huiyan,Jiang Qianyi,Zhong Xiaocong,Hu Xingshuai
In the recent years, microplastics have attracted much attention as new emerging environmental pollutants. Previously, several studies were performed to understand the source and fate of microplastics in the environment, organisms, and food webs. To track microplastics and improve their legibility, labeling them is a very effective method during laboratory experiments. This study presents an effective Rhodamine B dye (RhB) staining method for microplastics. The method is crucial for the visual observation of white or transparent plastics by dyeing them in purple or pink, as well as makes the microplastics to fluoresce under common microscope fluorescence filter ranges. Five types of microplastic polymers, namely polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyurethane were used as the test materials. The efficiencies of ethanol, acetone, and distilled water as possible solvents for dissolving RhB were investigated. Next, the fluorescence stability in various conditions was assessed. The results indicated that ethanol was the most appropriate solvent in dissolving RhB used in staining the microplastics. RhB was fluorescently stable under varying conditions (light and gut fluid) or different solutions (KOH, nitric acid, and saturated NaCl). Additionally, RhB staining exhibited an insignificant effect on the Raman spectra of the microplastics. Our proposed method is simple and robust and helps to visualize the different types of microplastic polymers tested in laboratory experiments, particularly the transparent, white, and small size microplastics.
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BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
·
2020
·Vol. 68
·期 3
·469-475
·
IF 1.638
Ting-ting Yi,Han-yun Zhang,Hua Liang,Guo-zhong Gong,Yan Cai
Hepatitis B virus (HBV) is a worldwide epidemic pathogen that causes hepatitis B. On-site screening the HBV infection is of critical importance for preventing and diagnosing HBV infection. In this paper, a simple, visual, and rapid method for on-site detection of HBV-DNA has been developed. This method is based on betaine-assisted recombinase polymerase assay and followed with naked-eye detection via lateral flow assay (BRPA-LF). Result show that nonspecific amplification is prone to occur in recombinase polymerase amplification (RPA) if the assay was performed with serum sample without purification. This problem has been addressed by adding 0.8 M of betaine to the RPA reactions. It was demonstrated that BRPA-LF can detect 1,000 copies of HBV-DNA in 50 μL mixture, and achieved 90% sensitivity and 100% specificity for serum sample detection. These results demonstrated that BRPA-LF can resist serum interference and has great potential for on-site screening of HBV infection.
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Future Medicinal Chemistry
·
2019
·Vol. 11
·期 20
·
IF 3.617
Hongmei Xu,Fangfang Teng,Feilong Zhou,Li Zhu,Yi Wen,Runliang Feng,Zhimei Song
Aim: To encapsulate amphotericin B (AmB) with reduced toxicity and comparable activity. Results & methodology: The α-linolenic acid (ALA)-modified monomethoxy polyethylene glycol-g-PEI-g-ALA conjugate was employed to prepare AmB-loaded micelles (AmB-M). In vitro activity and release behavior of AmB-M were investigated. AmB-M enhanced AmB's water-solubility to 1.2 mg/ml, showing good storage stability. AmB-M could achieve a sustained and slow release of AmB, low hemolysis activity and negligible kidney toxicity when compared with commercial AmB injection. Antifungal activity and biofilm inhibition experiments confirmed that the antifungal activity of AmB-M against Candida albicans was similar to that of AmB injection. Conclusion: Monomethoxy polyethylene glycol-g-PEI-g-ALA micelles could be a preferable choice to treat systemic fungal infections as an efficient drug delivery system.
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