Results in Physics
·
2022
·
IF 4.565
Yige Du,Qilong Gao,Andrea Sanson,Hengli Xie,Yangming Hu,Gaojie Zeng,Juan Guo,Xiao Ren,Erjun Liang
Negative thermal expansion (NTE) is an intriguing physical phenomenon, which is of great significance for the high precision application. In this work, we have realized to broaden the NTE temperature zone in Mg 2 P 2 O 7 -based bulk material by doping Cu atom on the Mg site. A joint study of Raman scattering and X-ray diffraction (XRD) indicates that there are double phases in the NTE temperature zone, and the NTE of Mg 1.9 Cu 0.1 P 2 O 7 bulk material comes from the phase transition of α - and β -phase. The present work provides a way to optimize negative thermal expansion property in phase transition typed materials.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
功能材料
·
热学性能
✓ 已验证
DOI
高影响因子
Solar RRL
·
2018
·Vol. 2
·期 10
·1800144
·
IF 0
Muhammad Ishaq,Hui Deng,Shengjie Yuan,Huan Zhang,Jahangeer Khan,Umar Farooq,Haisheng Song,Jiang Tang
Sb 2 (Se x S 1–x ) 3 has been proven a very promising light absorbing material for photovoltaic applications due to its high stability, tunable band gap, non-toxic element, and high extinction coefficient. For Sb 2 (Se x S 1–x ) 3 alloy film deposition, the authors develop a single source based rapid-thermal-evaporation (RTE) method instead of the traditional in-situ sulfurization or double source co-evaporation based RTE method. The absorber band gap can be precisely tuned from 1.1 to 1.7 eV by simply varying the molar ratio of Sb 2 Se 3 and Sb 2 S 3 source powder. From the systematical composition screening, FTO/CdS/Sb 2 (Se 0.68 S 0.32 ) 3 /Au devices show higher power conversion efficiency (PCE ∼ 4.17%) when compared with other absorber compositions based devices. In order to achieve thinner ETL layers and simultaneously avoid pinholes led by rough FTO surface, we introduce for the first time double buffer layer in the Sb 2 (Se 0.68 S 0.32 ) 3 device system which could further improve the device efficiency from 4.17% to 5.73%. The double buffer layer ZnO/CdS helped to form graded energy band alignment, suppress charge recombination and efficiently extract electrons. The devices obtained higher J sc and V oc supported by various physical characterization analyses. The facile single source deposition method, efficient double buffer layer device structure and notable PCE are expected to pronouncedly promote antimony chalcogenide device development.
研究领域:
材料科学
·
光伏技术
·
半导体物理
·
薄膜器件
·
能源材料
✓ 已验证
DOI
OPTICAL MATERIALS
·
2017
·
IF 2.238
Jianjian Sun,Bijun Fang,Shuai Zhang,Zhihui Chen,Jianning Ding,Xiangyong Zhao,Haosu Luo
Er 3+ -doped Na 0.5 Bi 0.5 TiO 3 (Er-doped NBT) ceramics were prepared via a hydrothermal method . High sintering active Er-doped NBT nano cubic particles with perovskite structure were synthesized at hydrothermal condition of 200 °C for 24 h in 12 M NaOH solution, which were self-assembled via in situ crystallization mechanism by the initially as-grown nanowires. The Er-doped NBT ceramics sintered at 1100 °C for 2 h exhibit pure rhombohedral perovskite structure, high densification and rather homogenous microstructure morphology. Under 488 nm light excitation , the strong green emission peaks centering at 530 nm and 550 nm and the weak red emission peaks locating at 665 nm and 735 nm are excited, which can be attributed to the 2 H 11/2 , 4 S 3/2 , 4 F 9/2 and 4 I 9/2 → 4 I 15/2 transitions, respectively. The maximum emission intensity is obtained when the Er doping content reaches 1.0 mol%. A strong upconversion emission peak centering around 550 nm in green light range is excited under 800 nm light excitation, which is correlated with the 4 S 3/2 → 4 I 15/2 transition.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
光电子学
·
固体化学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Hui Liu,Sen Zhao,Zhengwen Xie,Kai Zhu,Xiaomeng Xu,Xuhan Ding,Adam Glowacz
The pyrophoric tendency of the powder of corrosion products and deposits in oil tanks was investigated by performing several series of tests in a modified self-heating experimental apparatus based on the crossing point temperature method. Three samples of the powder of corrosion products and deposits in oil tanks as well as a ferrous sulfide were used as test samples. The corresponding apparent activation energies ( E a s) were obtained: 26.1 kJ mol −1 for the corrosion products of a crude oil storage tank, 27.2 kJ mol −1 for the middle distillate oil storage tanks, and 43.5 kJ mol −1 for ferrous sulfide; the unexposed cross-point for deposits of a crude oil storage tank was at a temperature below 250 °C. Those values of E a s indicated that the corrosion products of the two oil storage tanks showed a stronger pyrophoric tendency than did the deposits of the crude oil storage tanks and ferrous sulfide. Furthermore, the E a values were similar to those of reactions reported for the incomplete oxidation of hydrogen sulfide (H 2 S), thus supporting the viewpoint that H 2 S may be considered the intermediate product for accelerating the self-heating and self-ignition of sulfide at temperatures below 250 °C and may play a major role in inducing fires and explosions in storage oil tanks. In addition, possible sources of H 2 S in self-heating of the corrosion product were largely caused by thermochemical sulfate reduction or thermal decomposition of the organic matter of oil tanks.
研究领域:
化学工程
·
安全工程
·
石油储运
·
燃烧学
·
材料腐蚀与防护
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52368
·
IF 3.057
Xiongfei Zhang,Tianhui Zhao,Ting Cao,Peiyu Liu,Chuang Ma,Pengyun Li,Dang Huang
In this paper, bisphenol A (BPA), epichlorohydrin (ECH), and isocyanate trimer (TDI-T) are used as raw materials to synthesize a high toughness/trimer epoxy resin by graft copolymerization. It was cured at room temperature with low molecular weight polyamide 650 (PA650)/isophorone diamine (IPDA) and low molecular weight polyamide 650/triethylene tetramine (TETA) composite curing system respectively. The cured products of the two compound systems were studied by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), thermogravimetry (TG), and mechanical property testing. The results show that with the increase of TETA and IPDA curing agents, the heat released during the curing process of the two systems also greatly increases, and the temperature rises from the initial 33.9–69.7°C and 52.8°C. The curing time is shortened from a few days to a few hours, and the controllability of the curing time is effectively realized. When the ratio of triethylene tetramine to low molecular weight polyamide 650 is 2.86:100, the compressive strength is the best, reaching 112.7 MPa, 12% higher than pure polyamide as curing agent, and the specimen can be completely restored to its original shape in a few minutes. When the ratio of TETA to PA650 is 2.86:100, the elongation at break reaches 21.4%.
研究领域:
高分子化学
·
材料科学
·
复合材料
·
热固性树脂
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·10008-10017
·
IF 2.478
Zhai Hai-Fa,Li Wan,Zhang Jie,Xing Dou-Dou,He Yi-Xiao,Zhang Pan-Pan,Liu Hai-Rui,Yang Ji-En,Wang Bo
Polyhedral CaMoO 4 microcrystallites with excitation-induced tunable luminescent characteristics were successfully synthesized by a hydrothermal method. Polyhedral morphologies with different shapes and exposed facets were observed for the samples prepared at different temperatures. Sharp-vertex polyhedron was obtained at 140 °C due to the increase of (001) surface energy and the sample exhibited the strongest PL emission intensity due to its regular polyhedron morphology. Green and blue light emissions were observed separately under different excitation wavelengths in single CaMoO 4 microcrystallites, which can be attributed to the charge transfer transitions within the [MoO 4 ] 2− complex and the shallow defects in the bandgap, respectively. The excitation-induced tunable luminescent characteristics make it to be a promising inorganic single-emitting component for optical applications.
研究领域:
材料科学
·
无机化学
·
光学材料
·
纳米技术
·
固体化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Yongyong Deng,Youjian Chen,Bingang Chen,Jianhua Ma
In this study, a series of p-CuBi 2 O 4 /n-NaTaO 3 heteronanostructures were synthesized with the grinding–annealing method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and UV–vis diffuse reflectance spectroscopy (DRS). The photocatalysts exhibit enhanced photocatalytic activity for methyl blue dye degradation under visible-light irradiation. The highest photocatalytic degradation efficiency was observed when the sample calcined at 500 °C with 50 wt.% CuBi 2 O 4 content. On the basis of the calculated energy band positions, the mechanism of enhanced photocatalytic activity was discussed.
研究领域:
材料科学
·
光催化化学
·
环境功能材料
·
纳米材料
·
能源与环境技术
✓ 已验证
DOI
高影响因子
Bioresource Technology Reports
·
2018
·
IF 0
Hao Li,Zhiling Liu
Hydrodeoxygenation (HDO) is one of the most promising technologies for the biomass pyrolysis oil upgrading, but substantial challenges for the development of efficient HDO catalysts still remain. In this work, the nickel catalysts supported on carboxylic carbon nanotube (Ni/CCNTs-X, X = 1, 2, 3, 4 and 5) with different diameter have been synthesized for the HDO of model compound (vanillin) to p -creosol. As the tube diameters of Ni/CCNTs-X catalysts increased, the catalytic activity increased firstly, and then decreased. The conversion of vanillin over Ni/CCNTs-4 catalyst reached up to 90.0% under mild reaction condition, with a concomitant 87.7% selectivity of p -creosol. The transformation pathway for the HDO of vanillin over Ni/CCNTs-X catalysts involve in hydrogenation, hydrogenolysis and etherification .
研究领域:
催化化学
·
能源化学
·
生物质转化
·
可再生能源
·
环境化学
✓ 已验证
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Quan Wang,Jinyu Huang,Jiaxi Zhou,Zhenhua Liu,Youfu Geng,Zhiqiang Liang,Yu Du,Xiaoqing Tian
By varying different solvents, WO 3 nanoparticles, nanorods, and nanoflakes were synthesized via facile solvothermal processes without structure-directing agent. The as-prepared products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption–desorption measurements. The effect of the polarity of organic solvents used in the synthesis procedure on the morphologies of as-synthesized WO 3 materials was proposed. Gas sensors based on the synthesized products were fabricated and their gas sensing properties were tested towards a variety of target gases. The results indicated that the sensor based on WO 3 nanoparticles exhibited excellent selectivity, better response and recovery behavior and much higher sensitivity toward Cl 2 compared to those based on WO 3 nanorods, and nanoflakes, although three samples have similar specific surface areas. These characteristics are suggested to arise from good crystallinity and high concentration of oxygen vacancy on the surface of WO 3 nanoparticles.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
无机化学
·
表面科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Guiyan Sun,Shaobo Lai,Xiangbang Kong,Zhiqiang Chen,Kun Li,Rong Zhou,Jing Wang,Jinbao Zhao
A blend cathode has been prepared by mixing both LiNi0.5Co0.2Mn0.3O2 (NCM523) of high energy density and high specific capacity and LiFe0.15Mn0.85PO4/C (LFMP/C) of excellent thermal stability via a low-speed ball-milling method. The lithium ion batteries using the blend cathode with LFMP/C of optimum percent exhibit better capacity retention after 100 cycles than those using only single NCM523 or LFMP/C. Both theoretical simulation and experimental rate performances demonstrate that the electrochemical property of blend cathode materials is predictable and economical. In addition, the thermal behaviors of blend cathodes are studied by using differential scanning calorimetry analysis. The thermal stability of blend cathode materials behaves better than that of the bare NCM523 accompanied with an electrolyte. It is found that the outstanding rate and thermal performance of the blend cathode is due to the prominent synergistic effect between NCM523 and LFMP/C, and 10% LFMP/C in the blend cathode materials is the most adaptable as considering both electrochemical and thermal properties simultaneously.
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
固态化学
·
热分析
✓ 已验证
DOI
高影响因子
Microfluidics and Nanofluidics
·
2016
·Vol. 20
·期 9
·1-10
·
IF 2.537
Xu Zheyun,Jiang Feng,Xu Zhongbin,Xu Haoyan,Ruan Xiaodong
Thermoplastic polyurethane microcapillary film (TPU-MCF), as a novel extruded product, inherently contains an array of circular micron-sized capillaries embedded inside the polymer matrix. With the aid of simple laser cutting and conventional sealing technologies, a rapid prototyping method for microfluidic devices is proposed based on the ready-made microstructure of MCFs. Two functionalized microfluidic devices: serpentine micromixer and multi-droplet generator, are rapidly fabricated to demonstrate the advantages and potential of employing this new method. The whole proof-of-concept fabrication process can be completed in 8–10 min in a simple way; each procedure is repeatable with stable performance control of microfluidic devices; and the material cost can be as low as $0.01 for each device. The TPU-MCF and this novel method are expected to provide a new perspective and alternative in microfluidic community with particular requirements.
研究领域:
生物医学工程
·
微流体技术
·
材料科学
·
快速原型制造
·
生物芯片
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Zhuo Zhang,Xiaoming Duan,Baofu Qiu,Zhihua Yang,Delong Cai,Peigang He,Dechang Jia,Yu Zhou
Textured hexagonal boron nitride (h-BN) matrix composite ceramics were prepared by hot pressing using 3Y 2 O 3 -5Al 2 O 3 (mole ratio of 3:5) and 3Y 2 O 3 -5Al 2 O 3 -4MgO (mole ratio of 3:5:4) as liquid phase sintering additives, respectively. During the sintering process with liquid phase environments, platelike h-BN grains were rotated to be perpendicular to the sintering pressure, forming the preferred orientation with the c -axis parallel to the sintering pressure. Both h-BN matrix ceramic specimens show significant texture microstructures and anisotropic mechanical and thermal properties. The h-BN matrix ceramics prepared with 3Y 2 O 3 -5Al 2 O 3 -4MgO possess higher texture degree and better mechanical properties. While the anisotropy of thermal conductivities of that prepared with 3Y 2 O 3 -5Al 2 O 3 is more significant. The phase compositions and degree of grain orientation are the key factors that affect their anisotropic properties.
研究领域:
材料科学
·
无机非金属材料
·
先进陶瓷
·
热管理材料
·
结构功能一体化材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）