JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 127
·期 1
·402-409
·
IF 1.289
Haohua Ye,Zhanxiong Li,Guoqiang Chen,Dan Fan
Bis (1H, 1H, 2H, 2H-perfluoro-octyl)methylenesuccinate (FOM)/ethyl acrylate (EA)/methyl methacrylate (MMA) copolymer (FOME) latexes, FOM/butyl acrylate (BA)/MMA copolymer (FOMB) latexes, and FOM/octyl acrylate (OA)/MMA copolymer (FOMO) latexes were synthesized by continuous emulsion polymerization. Solution polymerization was also carried out to prepare FOMB. The influences of fluorine content and curing conditions on the surface properties of polymer films were discussed. The water and oil repellency of cotton fabrics treated with the FOM copolymers was better than that of conventional poly(fluoroalkyl acrylate)s containing the same fluorinated chain. The polymer films or the treated fabrics were characterized by Fourier transform infrared, scanning electron microscope, atomic force microscopy, thermogravimetric analysis, x-ray photoelectron spectrometry, and wide angle x-ray diffraction. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci, 2013
研究领域:
材料科学
·
纺织化学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Feihong Ye,Liping Li,Jianyin Xu,Lu Zhou
Synthesization of 1H,1H,2H,2H-Perfluorooctyltrimethoxysilane through solvent-free hydrosilylation of 1H,1H,2H-perfluoro-1-octene with trimethoxysilane was efficiently conducted over the RuCl 3 ·3H 2 O catalyst. The synergistic action of Ru 3+ as the active center and the strong electronegativity of Cl − to attract the electron of the electron-donating group –OCH 3 in trimethoxysilane, activated the Si-H and thus promoted the reaction. The influences of different reaction conditions including feed order, feed ratio, catalyst dosage, reaction temperature and reaction time on the reaction yield were fully investigated, to conclude the optimized condition to achieve a yield of 86.80% was the feed of 1.2 mol trimethoxysilane per mole of 1H,1H,2H-perfluoro-1-octene, together with the addition of 9.56 × 10 −4 mol RuCl 3 ·3H 2 O per mole of trimethoxysilane, at 80 °C for 4 h; while the additive of CuCl to RuCl 3 ·3H 2 O catalyst could further improve the reaction yield at 50℃. Finally, after understanding the activity of Ru with different valence state, the reaction mechanism was also proposed.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Dezhi Wang,Boyu Su,Yan Jiang,Lu Li,Boon K. Ng,Zhuangzhi Wu,Fangyang Liu
Molybdenum disulfide (MoS 2 ) has emerged as a prominent nanomaterial in photoelectrocatalytic water splitting due to its appropriate energy band and low production cost. However, its low-density active site and poor-efficiency electron transfer have essentially limited the photoelectrocatalytic properties. In this present study, we have proposed a simple yet novel ammoniated molybdenum disulfide with a unique 1T/2H heterostructure as the photoelectrocatalyst via a facile hydrothermal reaction. The presence of the 1T phase in MoS 2 is found to enhance the electronic conductivity as well as boost the density of the active site, resulting in an increase in efficiency for both electron transfer and mass transport. More importantly, the synergistic effect of the 1T/2H heterostructure of MoS 2 has been demonstrated to improve the photoelectrocatalytic properties.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
BIOCATALYSIS AND BIOTRANSFORMATION
·
2025
·
IF 1.9
Shenhan Xie,Yanyang Sun,Xu Yan,Yu Han,Chunyu Wang,Fengxi Li,Lei Wang,Zhi Wang
An efficient and environmental method was employed to synthesize multi-substituted 2H-pyran from methyl coumalate and β-keto esters or diketones. Porcine pancreas lipase (PPL) can catalyze this transformation in high yields (74–96%) in aqueous medium (H2O: DMSO = 2:1) under mild conditions (60 °C). The reported strategy exhibits high functional group compatibility and broad substrate scope. In addition, it provides access to a variety of tetra-substituted 2H-pyrans which are considered privileged scaffolds with diverse biological activities.
研究领域:
有机化学
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生物催化
·
药物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yi Wang,Xinyan Xiao,Tingting Ding,Mingli Lu
The transition-metal dichalcogenides (TMDs) with 1T phase structure holds great promise for providing abundant active sites and superior conductivity, while the achievement of highly efficient degradation activity over bare TMDs and TMDs-based photocatalysts is still challenges. In this work, a flower-like mixed 1T-2H phase MoSe 2 was synthesized via a sodium borohydride (NaBH 4 )-assisted solvothermal method, and then was selected as a “charge-transfer-bridge” to fabricate a dual Z-scheme AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 composite with a 0D/3D hierarchical structure. The optimal AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 composite exhibited the superior photocatalytic activity towards degrading RhB and TC relative to AgI/2H MoSe 2 /Bi 4 O 5 Br 2 and AgI/Bi 4 O 5 Br 2 . The enhancement is attributed to its better light absorption, abundant active sites, and superior charge carrier mobility and separation efficiency, resulted from synergetic effect of 0D/3D structural coupling and energy band matching. Moreover, the important energy band alignments and mixed 1T-2H phase MoSe 2 boosting photocatalytic mechanism of as-prepared AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 heterojunction were investigated. This work describes a competitive design and fabrication technique for constructing novel mixed phase TMDs-based Z-scheme heterojunctions to address environmental issues.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Cao Tan,Jianghao Liu,Haijun Zhang,Junkai Wang,Saisai Li,Jianbo Song,Yuxin Zhang,Shaowei Zhang
A novel molten-salt-mediated magnesiothermic reduction method was used to prepare 2H-SiC ultrafine powders by using silicon dioxide , active carbon and magnesium powders as raw materials. Phase compositions in the SiO 2 -2Mg-C system were thermodynamically evaluated by using the FactSage 6.2 package, and the effects of firing temperature, molar ratio of n(C)/n(Si) and amount of Mg on the synthesis of 2H-SiC powders were discussed. Phase compositions and microstructures of as-prepared ultrafine SiC powder were characterized by using X-ray diffraction (XRD), field emission gun scanning electron microscope (FE-SEM) and transmission electron microscope (TEM). SiO 2 could be completely converted into SiC after 3 h at 1073 K, this temperature was about 600 K lower than required by the conventional methods, and the relatively content of 2H-SiC in the final SiC sample reached about 45 wt%. Furthermore, the content of 2H-SiC could be increased to 72 wt% upon firing at 1373 K for 3 h and using about 60 wt% excessive Mg. In contrast to this, only 20 wt% SiC was formed in the sample fired under the identical conditions but without using a molten salt medium. The average crystalline sizes of 2H-SiC in the product powders resultant from 3 h firing at 1073 and 1373 K were about 24 and 39 nm, respectively. A formation mechanism of SiC powder in the case of using molten-salt-mediated magnesiothermic reduction was proposed based on the experimental results.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2018
·Vol. 11
·期 9
·4587-4598
·
IF 7.994
Zhang Jingtong,Chen Yalan,Liu Ming,Du Kun,Zhou Yan,Li Yanpeng,Wang Zhaojie,Zhang Jun
Few-layered MoSe 2 nanosheets with mixed 1T/2H phase were successfully arrayed on a Ti substrate (forming 1T@2H-MoSe 2 /Ti) through a facile one-step solvothermal process. After testing different synthesis conditions, it was found that the optimal process involves a temperature of 200 °C and a reaction time of 12 h. Structural characterizations reveal that the morphology of 1T@2H-MoSe 2 consists of edge-terminated nanosheets with one to five layers, composed of a mixed 1T/2H phase dominated by the 1T one. The 1T@2H-MoSe 2 /Ti electrode shows excellent HER catalytic activity, with a small onset potential (−120 mV vs. reversible hydrogen electrode, RHE) and an electrode potential of only −133 mV (vs. RHE) to achieve a current density of 20 mA·cm −2 . This excellent electrocatalytic activity is due to the synergistic effects of 1T metallic phase, few-layered nanosheet morphology, and direct growth of 1T@2H-MoSe 2 on the Ti substrate. In addition, the 1T@2H-MoSe 2 /Ti electrode shows excellent stability towards long-term electrolysis. This is due to the long-term stability of the valence states of Mo and Se, as shown by post-electrolysis X-ray photoelectron spectroscopy analysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8203-8214
·
IF 3.925
Lingli Zhang,Han Tao,Chun Ji,Qiaoling Wu,Xiao Wang,Yuangeng Wu
As an alternative to bisphenol A (BPA), bisphenol S (BPS) is widely used in many consumer goods and industrial products. However, BPS has similar genotoxic, reproductive and endocrine disrupting effects to BPA and can enter the body through the food chain or by dermal absorption to endanger human health. This paper presents a rapid and direct electrochemical sensing technique for ultra-trace BPS determination on the basis of the signal amplification of the 1T phase & 2H phase hybrid MoS2 nanosheets (1T&2H-MoS2) and amino-functionalized carbon nanotube (CNTs-NH2) composites. The cooperative electrocatalytic effect and high-electrically active surface area of 1T&2H-MoS2/CNTs-NH2 composites not only facilitated the electron transfer between BPS and the electrode, but also promoted the adsorption of BPS on the electrode. Hence, the 1T&2H-MoS2/CNTs-NH2 modified electrode exhibited excellent electrocatalytic activity with a lower oxidation potential and higher peak current for BPS. Under the optimized conditions, the peak current response of BPS showed a good dose-dependent relationship with its concentration in the range of 0.02–1.0 μM and 1.0–70.0 μM, while the detection limit was as low as 8.6 nM. The proposed method was used to determine BPS in the mineral water bottle and orange juice samples with satisfactory spiked recoveries between 92.31% and 104.20%, demonstrating its reliability and practicality in real sample analysis. Furthermore, the sensing method has the characteristics of facile electrode fabrication, fast response (<4 min) and good reproducibility.
研究领域:
环境科学
·
分析化学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Fungi
·
2023
·Vol. 9
·期 8
·863
·
IF 4.7
Yinggu Wu,Xinyu Li,Li Dong,Tong Liu,Zhengbin Tang,Runmao Lin,Justice Norvienyeku,Mengyu Xing
The litchi downy blight disease of litchi caused byPeronophythora litchiiaccounts for severe losses in the field and during storage. While ample quantitative studies have shown that 6-pentyl-2H-pyran-2-one (6PP) possesses antifungal activities against multiple plant pathogenic fungi, the regulatory mechanisms of 6PP-mediated inhibition of fungal pathogenesis and growth are still unknown. Here, we investigated the potential molecular targets of 6PP in the phytopathogenic oomycetesP. litchiithrough integrated deployment of RNA-sequencing, functional genetics, and biochemical techniques to investigate the regulatory effects of 6PP againstP. litchii. Previously we demonstrated that 6PP exerted significant oomyticidal activities. Also, comparative transcriptomic evaluation ofP. litchiistrains treated with 6PP Revealed significant up-regulations in the expression profile of TOR pathway-related genes, includingPlCytochrome Cand the transcription factorsPlYY1. We also noticed that 6PP treatment down-regulated putative negative regulatory genes of the TOR pathway, includingPlSpm1andPlrhoH12inP. litchii. Protein-ligand binding analyses revealed stable affinities between PlYY1, PlCytochrome C, PlSpm1, PlrhoH12 proteins, and the 6PP ligand. Phenotypic characterization ofPlYY1targeted gene deletion strains generated in this study using CRISPR/Cas9 and homologous recombination strategies significantly reduced the vegetative growth, sporangium, encystment, zoospore release, and pathogenicity ofP. litchii. These findings suggest that 6PP-mediated activation ofPlYY1expression positively regulates TOR-related responses and significantly influences vegetative growth and the virulence ofP. litchii. The current investigations revealed novel targets for 6PP and underscored the potential of deploying 6PP in developing management strategies for controlling the litchi downy blight pathogen.Keywords:P. litchii;6-pentyl-2H-pyran-2-one (6PP);TOR pathway;CRISPR/Cas 9;PlYY1
研究领域:
植物病理学
·
分子生物学
·
真菌学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Kunjie Wang,Yan Jing,Shuang Gao,Xianrong Liu,Bingxin Liu,Yongcheng Li,Peng Zhang,Benhua Xu
Implanting the octahedral phase (1 T) into the hexagonal phase (2H) of the molybdenum disulfide (MoS 2 ) matrix is considered one of the effective methods to enhance hydrogen evolution reaction (HER) performances of MoS 2 . In this paper, hybrid 1 T/2H MoS 2 nanosheets array was successfully grown on conductive carbon cloth (1 T/2H MoS 2 /CC) via facile hydrothermal method and the 1 T phase content in 1 T/2H MoS 2 is regulated to gradually increase from 0 % to 80 %. 1 T/2H MoS 2 /CC with 75 % 1 T phase content exhibits optimal HER performances. The DFT calculation results show that S atoms in 1 T/2H MoS 2 interface exhibit the lowest hydrogen adsorption Gibbs free energies (ΔG H* ) compared with other sites. The improvement of HER performances are primarily attributed to activating the in-plane interface regions of the hybrid 1 T/2H MoS 2 nanosheets. Furthermore, the relationship between 1 T MoS 2 content in 1 T/2H MoS 2 and catalytic activity was simulated by a mathematical model, which shows that the catalytic activity presents a trend of increasing and then decreasing with the increase of 1 T phase content.
研究领域:
材料科学
·
理论计算
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SYNTHESIS-STUTTGART
·
2023
·Vol. 55
·期 20
·3393-3401
·
IF 2.6
Yue-Lu Zhu,Jie Yan,Xiu-Xuan Xu,Zong-Yu Sun,Jiao Chen
Copper-catalyzed coupling reaction involving N-phenoxyacetamides and 2H-azirines is described, in which N–O and C–N bonds are broken and restructured. This protocol provides an efficient strategy for the highly regioselective synthesis of racemic α-amino oxime ethers. In addition, this strategy can be used to modify natural products and is gram-scale compatible.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 14
·10302-10312
·
IF 2.993
Fan Hongmei,Wu Rong,Liu Haiyang,Yang Xi,Sun Yanfei,Chen Chu
Hybrid-phase-MoS 2 (1T@2H-MoS 2 ) nanosheet-coated black TiO 2 spheres (1T@2H-MoS 2 /B-TiO 2 ) were prepared using a hydrothermal method and a chemical reduction method under an argon atmosphere. X-ray diffraction, transmission electron microscope, Raman spectra and X-ray photoelectron spectroscopy indicated the generation of the 1T@2H-MoS 2 and black TiO 2 . The efficiency of the 1T@2H-MoS 2 /B-TiO 2 core–shell structure degradation of rhodamine B (RhB) reached 98.0%. The high photocatalytic activity was due to the presence of 1T-MoS 2 , which accelerated the electron transfer to participate in the redox reaction. In addition, the presence of B-TiO 2 suppressed the undesirable electron–hole recombination. Finally, the synergistic effect between 1T@2H-MoS 2 and B-TiO 2 promoted the separation of the photoelectron–hole pairs. Moreover, scavenger studies found that the hydroxyl radical ( • OH) was the dominant reactive oxygen species in the degradation of RhB under visible light irradiation. The possible growth mechanism and photocatalytic mechanism are discussed in detail. The results of this study will contribute to the improvement in the visible light absorption and photocatalytic degradation of catalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
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