Catalysis Science & Technology
·
2024
·Vol. 14
·期 10
·2848-2857
·
IF 4.4
Xingshun Zhao,Yunshuai Mi,Tingwei Cai,Wanming Chen,Xia Dong,Jinxin He,Qiangqiang Zhao
Phloxine B (PHB) exhibited high catalytic efficiency in cross-dehydrogenation coupling (CDC) reactions. However, conventional homogeneous catalytic systems involving organic dyes faced challenges regarding catalyst separation and recovery. In this study, we successfully synthesized a nanofiber-based photocatalyst comprising polyvinyl alcohol (PVA), poly(dimethyl diallyl ammonium chloride) (PDADMAC) and phloxine B (PHB). The OHCP nanofiber photocatalyst demonstrated exceptional catalytic performance in CDC reactions upon visible light irradiation. The conversion ratio of N-phenyl-tetrahydroisoquinoline (N-phenyl-THIQ) reached 94% following continuous irradiation with visible light (1 W) for 3 hours. Concurrently, the conversion ratios of N-phenyl-THIQ derivatives ranged from 70% to 96%. Additionally, reusability test indicated that the OHCP nanofiber photocatalyst maintained relative stability after six cycles of the catalytic CDC reaction. The fluorescence intensity of the nanofibers diminished by merely 50% following 12 hours of the catalytic CDC reaction. This suggested that the photocatalyst possessed potential for long-term reuse with minimal reduction in catalytic performance.
研究领域:
材料科学
·
有机化学
·
环境科学
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DOI
高影响因子
International Journal of Astrobiology
·
2021
·Vol. 20
·期 2
·159-177
·
IF 1.673
Binod Prasad,Peter Richter,Nithya Vadakedath,Ferdinand W. M. Haag,Sebastian M. Strauch,Rocco Mancinelli,Achim Schwarzwälder,Emmanuel Etcheparre,Nicolas Gaume,Michael Lebert
The unique environment of space is characterized by several stress factors, including intense radiation, microgravity, high vacuum and extreme temperatures, among others. These stress conditions individually or in-combination influence genetics and gene regulation and bring potential evolutionary changes in organisms that would not occur under the Earth's gravity regime (1 × g). Thus, space can be explored to support the emergence of new varieties of microbes and plants, that when selected for, can exhibit increased growth and yield, improved resistance to pathogens, enhanced tolerance to drought, low nutrient and disease, produce new metabolites and others. These properties may be more difficult to achieve using other approaches under 1 × g. This review provides an overview of the space microgravity and ionizing radiation conditions that significantly influence organisms. Changes in the genomics, physiology, phenotype, growth and metabolites of organisms in real and simulated microgravity and radiation conditions are illustrated. Results of space biological experiments show that the space environment has significant scientific, technological and commercial potential. Combined these potentials can help address the future of life on Earth, part of goal e of astrobiology.
研究领域:
天体生物学
·
分子生物学
·
遗传学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 34
·20760-20768
·
IF 3.361
Yue Hu,Salah Ahmed Sarhan Al-Shujaa,Bin Zhen,Yaping Zhang,Xianggao Li,Yaqing Feng
Electrophoretic display (EPD) is a type of flexible display which has attracted wide attention. In this work, blue nanosized crystals of cobalt aluminum oxide (CoAl2O4) were precipitated on silica nanoparticles, and then the nanocomposites were coated with an ionic liquid polymer (PIL) to give blue electrophoretic particles. The blue nanocomposites (SCAs) formed possess an excellent spherical structure, and the average diameter is about 188 nm. The porous silica matrix presents a relative light density, and the blue CoAl2O4 pigment offers excellent color. The outside ionic liquid polymer supplies the PIL/SCAs with a light density of 1.7915 g cm−3, excellent hydrophobicity and dispersion stability in the electrophoretic liquid. The fabricated single-particle EPD prototypes show a response time of 165 ms in the EPD cell with a 0.2 mm thickness, which is much faster than the commercial EPDs, and this is probably because of the unique composite structure.
研究领域:
材料科学
·
显示技术
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xiaofeng Xie,Lanshan Liu,Shusheng Chen,Yuanquan Zhou,Xiaohong Hu
Proton electrolyte membrane water electrolysis (PEMWE) is a promising hydrogen generation method limited by the high cost, such as those costs associated with noble electrocatalysts. Herein, we investigate commercial tungsten carbide (WC), a potential substitute for Pt, as a hydrogen evolution reaction (HER) electrocatalyst in PEMWE. We adopted two sizes of WC, 400 nm and 1 μm, optimized the electrode fabrication method and running conditions. The results show that the smaller WC does not provide stable performance and operating at high current density and low temperature is more competitive with Pt-based electrolysis. In addition, the most serious drawback is the increased cell voltage on restart after long-term power-off due to considerable WC oxidation, which leads to a decrease in the catalytic carbide carbon. Luckily, this can be offset by effective O 2 isolation in the cathode, such as H 2 O sealing or pumping with H 2 . WC is an economic alternative as a HER electrocatalyst in PEMWE with optimized conditions and an O 2 isolation strategy during an interrupted operation. We provide a practical method to reduce the cost of the HER electrocatalyst.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Weiqiang Zhi,Shanglin Xiang,Renji Bian,Ruizhi Lin,Kaihua Wu,Tingwei Wang,Dongyu Cai
In this work, an emulsion method is applied to fill two-dimensional MXenes into polyurethanes (PUs). It shows that the addition of 0.5 wt% MXenes increase the yield stress, tensile strength and hardness of PUs by ∼70%, ∼20% and ∼13%, respectively. The mechanical enhancement is associated with the increase of hardness and reduction of water absorption. Morphologic study shows that a good dispersion of MXenes is achieved, in which ball milling is a key step for ensuring a stability of MXene-filled PU emulsions. Furthermore, FTIR analysis reveals the strong interaction between MXenes and PUs at molecular level.
研究领域:
材料科学
·
纳米复合材料
·
高分子工程
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DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·Vol. 33
·期 20
·11309-11320
·
IF 2.3
Zhang Dongbo,Feng Xiaolong,Song Ruiqing,Wang Ning,Zhang Yongsheng
Thermal barrier coating (TBC) is applied to protect the hot-section components of a gas turbine engine. In the present work, a La 2 (Zr 0.2 Ti 0.2 Y 0.2 YB 0.2 Nb 0.2 ) 2 O 7 high entropy oxide was designed, fabricated by a solid-phase reaction at 1400 °C, and subjected to an investigation of its properties. The results indicate that the La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 high entropy oxide had a pyrochlore structure. During synthesis, a small amount of La 2 TiO 5 was produced. The thermal conductivity of the La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 high entropy oxide was approximately 0.8855 W·m -1 ·K -1 at room temperature. The coefficient of thermal expansion of the La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 high entropy oxide was approximately 9.374 × 10 −6 K −1 at 1000 °C. To improve the service life of the TBC composed of the La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 , a double-layer structural coating composed of La 2 (Zr 0.2 Ti 0.2 Y 0.2 YB 0.2 Nb 0.2 ) 2 O 7 and yttria-stabilized zirconia (YSZ) layers was designed and produced on a NiCoCrAlY alloy by laser cladding. The thermal cycling behavior of the double-layer coating was studied at 1050 °C. The results indicate that a La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 single-phase defective-fluorite high entropy oxide was produced after preparation and thermal cycling. The spallation of the double-layer coating composed of La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 /YSZ occurred after 70 thermal cycles at 1050 °C. The double-layer coating composed of La 2 (Zr 0.2 Ti 0.2 Yb 0.2 Y 0.2 Nb 0.2 ) 2 O 7 /YSZ can increase the thermal cycling lifetime of TBCs containing high entropy oxides.
研究领域:
材料科学
·
表面工程
·
陶瓷材料
·
高温材料
·
热障涂层技术
✓ 已验证
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2016
·
IF 3.48
Zuhua Zhang,John L. Provis,Jin Zou,Andrew Reid,Hao Wang
Variations between fly ashes can lead to significant differences in the geopolymers derived from them, in both microstructural and mechanical properties. This study assesses the effect of physical, crystallographic and chemical characteristics of fly ash on geopolymerisation performance and the strength of the resulting binders. Physical and glass chemistry factors are combined to develop a comprehensive index to evaluate the suitability of fly ashes for the production of high-strength geopolymers. An equation for this index is proposed, developed using five typical low-calcium fly ashes and then validated against a further eight literature datasets, showing a good relationship between the ranking order of the calculated index and the compressive strengths of geopolymer pastes produced with comparable activator and paste workability. This index can be used to screen the source materials, which is of significant value in moving alkali activated cements towards acceptance in practice.
研究领域:
材料科学
·
硅酸盐化学
·
建筑材料
·
固废资源化
·
胶凝材料化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 7
·2310-2321
·
IF 4.029
Lianwei Shan,Yuteng Liu,Hongtao Chen,Ze Wu,Zhidong Han
We prepared an α-Bi2O3/BiOBr core–shell heterojunction via a facile in situ chemical transformation method. Ultrathin BiOBr nanosheets were observed and these were found to be evenly distributed on the surface of α-Bi2O3/BiOBr by SEM and TEM. The results revealed that the prepared α-Bi2O3/BiOBr photocatalysts were porous, and their specific surface areas were found to be raised on comparing with α-Bi2O3 and BiOBr. In our experiments, the photocatalytic activity of α-Bi2O3 was obviously enhanced when assembling with ultrathin BiOBr compared with α-Bi2O3/BiOBr and the individual phase. It is considered that the surface porous structure increases the specific surface areas, which improved the adsorption characteristics of α-Bi2O3/BiOBr. The suitable band alignment (between α-Bi2O3 and BiOBr) and oxygen vacancy effect can be attributed to the increased photocatalytic activity under visible irradiation.
研究领域:
材料科学
·
物理化学
·
纳米科技
·
催化化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 13
·7377-7383
·
IF 3.119
Qingqing Liu,You Liu,Bingxin Lu,Yuting Wang,Yanglei Xu,Jin Zhai,Xia Fan
Inspired by functionalized biological ion channels, artificial channels were prepared to mimic the natural ones. The key concept behind the rectifying phenomena in nanochannels is the construction of asymmetric restrictive nanochannels. Here, we prepared nanoporous oxidized polyvinyl alcohol (PVA) and WO3 composite coatings on hourglass-shaped anodic aluminum oxide (AAO) nanochannel surfaces. Accordingly, a special “ion pool” is formed between the homogeneous junction in the middle of the AAO and the nanoporous PVA/WO3 film-covered AAO surface and its two ends are greatly nano-confined. Ion enrichment and ion depletion occur in the “ion pool” and are dependant on the applied voltage polarity. A rectification ratio of 458, which is in accordance with the highest value found in previous reports, was obtained from the cooperative effects of the two small open ends of the “ion pool”. Furthermore, this value is enhanced to about 2000 under constant voltage. An excellent pH-sensitive rectification property, with a single rectification direction from acidic to basic conditions, has also been demonstrated.
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2010
·Vol. 40
·期 17
·4397-4401
·
IF 4.081
Haowei Lin,Huibiao Liu,Xuemin Qian,Canbin Ouyang,Yuliang Li
Controlling the fabrication of the nanowire–nanotube junctions of a dichloro-bridged dimeric iridium complex of 2-phenylpyridine (IPPC) has been achieved by a facile template method. IPPC nanowire–nanotube junctions were prepared at 15 °C, and IPPC nanotubes could be formed by increasing the temperature. It is interesting that IPPC solid nanowires were produced when the temperature decreased to 0 °C. The results show that temperature is a key factor for controlling the process of growth. The emission of the IPPC nanostructures showed a blue shift and a stronger intensity in comparison to IPPC bulk materials.
✓ 已验证
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Dongyue Jiang,Fei Guo,Minyi Xu,Jingcheng Cai,Shuo Cong,Ming Jia,Guijun Chen,Yongchen Song
Utilizing the kinetic energy of a flowing river for irrigation could be tracked back to Hellenistic and Roman periods. In modern days, hydroelectric plants are built for harvesting the kinetic energy of the flowing river. However, a large investment is required in the hydroelectric plants for maximizing the power output . Here we present a low-cost and scalable TENG (triboelectric nanogenerators) based energy harvesting water wheel (ww-TENG). The water wheel works in a sliding freestanding TENG mode which generates power from the charges flow induced by contact electrification and electrostatic induction. A conformal fluorine coated carbon paper (f-CP) was employed to form the alternate electrodes. The deposited fluorine layer provides the benefits of high affinity to attract electrons as well as hydrophobicity for water repelling. The carbon paper offers a high electrical conductivity and rough structure to form a superhydrophobic property. These features enables a large charge induction and fast water/TENG separation for maximizing the power output of the energy harvesting water wheel. A lab-scale water wheel (diameter 10 cm and width 2.5 cm) is fabricated and a maximum 5.3 μW output power was measured under 50 MΩ resistance at a linear flow velocity of 2.6 m/s. The ww-TENG was employed for charging a 10 μF capacitor to 16 V and lighting up a commercial LED light bulb . As a comparison, an electromagnetic generator (EMG) could only charge the capacitor to 2.7 V with the same period of time. The EMG obtains a high power output at low load resistance case (< 100 kΩ) while the ww-TENG generates high power when the load resistance is large (> 10 MΩ). The present ww-TENG shows great potential for harvesting the kinetic energy from flowing river and targets for the applications with large load resistance like electrostatic systems.
✓ 已验证
DOI
高影响因子
ORGANIC LETTERS
·
2019
·
IF 6.555
Qian Xiong,Gonglin Li,Shunxi Dong,Xiaohua Liu,Xiaoming Feng
Catalytic asymmetric synthesis of hydrothiazole derivatives was developed via a well-organized formal [2 + 1 + 2] cycloaddition reaction triggered by asymmetric addition of isocyanide to alkylidene malonate. Various chiral hydrothiazole derivatives were readily provided in good yield with high enantioselectivity (up to 98% yield, 98.5:1.5 er) utilizing a chiral Mg(OTf)2/N,N′-dioxide complex as the catalyst under mild conditions. Based on the experimental studies and the structure of the catalyst, a possible catalytic cycle was proposed to elucidate the reaction process and activation mode.
研究领域:
有机化学
·
不对称合成
·
杂环化学
·
催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）