JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 10
·5133-5139
·
IF 1.491
Ullah Atta,Liu Hanxing,Hao Hua,Iqbal Javed,Yao Zhonghua,Cao Minghe,Xu Qi
The ceramics were prepared using the solid-state reaction method and their phase, microstructure and microwave dielectric properties were investigated. A single-phase clinoenstatite system with monoclinic structure (space group P2 1 /c) was confirmed through x-ray diffraction (XRD) analysis for the compositions with x ≤ 0.1. The compositions with x ≥ 0.15 contain SiO 2 and (Mg 1− x
Ni
x
) 2 SiO 4 phases only as confirmed from the XRD data of their sintered samples. The unit cell volume was decreased while the theoretical density was increased with increase in x from 0 to 0.1. A decrease in dielectric constant ( ε
r ) while an increase in unloaded quality factor multiplying the resonant frequency ( Q
u
f
o ) and temperature coefficient of resonant frequency ( τ
f ) was observed with increase in Ni content from 0 to x = 0.1. In the present study, ε
r ∼ 6.10, Q
u
f
o ∼ 118,702 GHz and τ
f ∼ −10 ppm/°C was achieved for the composition with x = 0.1 sintered at 1425°C for 9 h. The material is a good candidate for millimeter wave applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 6
·7285-7293
·
IF 2.478
Wang Ziyao,Luan Xuezhu,Ma Guofeng,Chen Jian,Liu Yangai
A series of novel Sm 3+ activated yellow–orange-emitting phosphors have been synthesized successfully by the conventional solid-state method. Their phase composition and luminescence properties have been investigated and discussed systematically. Upon excitation at 410 nm, all the studied phosphors showed intense narrow emissions with a prominent peak centered at around 610 nm, corresponding to 4 G 5/2 — 6 H 7/2 transition. The critical concentration of Sm 3+ ions was determined to be 0.02, and the concentration quenching mechanism was verified as dipole–dipole interaction. The investigation of thermal stability revealed that the photoluminescence intensity of Ba 3 Lu 3.92 O 9 :0.08Sm 3+ at 425 K remained around 81.4% of that at 298 K. Besides, when excited at 410 nm, the studied phosphor exhibited high color purity of 99.5% with the CIE chromaticity coordinates of (0.5974, 0.4010) and a low Correlation Color Temperature of 2217 K. Consequently, it could be expected that the as-synthesized Ba 3 Lu 4 O 9 :Sm 3+ phosphors would be a promising candidate of yellow–orange component for warm white or amber LEDs.
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IONICS
·
2021
·Vol. 27
·期 3
·1221-1231
·
IF 2.817
Li Bishan,Ye Rongkai,Wang Qianyu,Liu Xiaoqing,Fang Pingping,Hu Jianqiang
Exploring efficient catalysts for hydrogen evolution reaction (HER) is one of focus points of energy research. In this work, a series of MXene/Pt- x (wherein, x is the adding amount of 6.2 mM H 2 PtCl 6 solution) nanomaterials were fabricated via a facile synthesis method, in which coral-like Pt nanoparticles (NPs) were deposited on Ti 3 C 2 T x MXene. The Pt-loading amounts on the MXene could be simply controlled by varying the adding amounts of H 2 PtCl 6 , which would influence the sizes of Pt NPs on the MXene. The optimum catalytic activity was obtained on the MXene/Pt-3 with a low overpotential of 302 mV versus reversible hydrogen electrode (RHE) at 10 mA cm −2 , which was about 84 mV less than MXene/Pt-2. The efficiently electrocatalytic HER activity of MXene/Pt- x nanomaterials was due to the electron transfer from MXene to Pt NPs. The HER performance of the MXene/Pt- x nanomaterials was influenced by both Pt-loading amounts and Pt particle sizes. This work expands future applications of MXene-based nanomaterials in clean energy conversion reactions.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 12
·9167-9175
·
IF 2.22
Cai Wei,Zhang Qianwei,Zhou Chuang,Gao Rongli,Zhang Shilong,Li Zhendong,Xu Ruicheng,Chen Gang,Deng Xiaoling,Wang Zhenhua,Fu Chunlin
Ba 0.85 Ca 0.15 Zr 0.9 Ti 0.1 O 3 (BCZT) ceramics with various grain sizes were fabricated through solid-state method followed by different sintering temperatures. The influences of grain size and phase structure on the electric properties and energy storage performance were systematically investigated. The remnant polarization and quasi-static piezoelectric constant of BCZT samples increase gradually as grain size increases, and the samples with the grain size of 44.37 µm exhibit excellent ferroelectricity and piezoelectricity (2 P r = 25.4 µC/cm 2 , d 33 = 513 pC/N). Although the energy storage density of BCZT samples with the grain size of 8.28–44.37 µm is relative lower, all the ceramic samples have higher energy storage efficiency (82–87.4%). There is the maximum energy storage density in phase transition temperature of tetragonal–cubic phase for all BCZT ceramics and the maximum energy storage density first increases and then decreases with the increase of grain size. But the energy storage density of BCZT ceramics near room temperature decreases with increasing of grain size. The smaller grain size is beneficial to improve the room temperature energy storage density of BCZT samples and is disadvantageous to obtaining superior ferroelectric and piezoelectric properties.
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BMC Chemistry
·
2019
·Vol. 13
·期 1
·1-15
·
IF 0
Guo J.,Ma Yu L.,Yu Jia Y.,Gao Yu J.,Ma Ning X.,Wu Xiao Y.
Herein, 2-(2-methoxyphenoxy)-1-phenylethanol (β- O -4), 2-methoxyphenyl anisole (α- O -4) and 4-phenoxyphenol (4- O -5) were selected as typical lignin model compounds. Given the effectiveness of traditional acid–base catalysts for lignin depolymerisation, a novel Ni/CaO–H-ZSM-5(60) catalyst was prepared to investigate the difficulty level of C–O bond of three model compounds cleavage in ethanol. It was observed that Ni/CaO–H-ZSM-5(60) had prominent performance on the C–O bond cleavage at very mild conditions (140 °C, 1 MPa H 2 ). Among them, the C–O bond of α- O -4 and β- O -4 could be completely cleaved within 60 min. Although the C–O bond of 4- O -5 had high bond energy, 41.2% of conversion was occurred in 60 min. The introduction of CaO could regulate the acidity of H-ZSM-5 to enhance the ability to break C–O bonds. Moreover, the possible pathways of C–O ether bonds in three lignin model compounds cleavage were proposed in order to selectively obtain target products from the raw lignin degradation.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 6
·1-10
·
IF 6.408
Xia Dacheng,Jiang Panpan,Cai Zhiwei,Zhou Rui,Tu Bo,Gao Nan,Chang Gang,He Hanping,He Yunbin
A new approach is presented to fabricate flexible surface-enhanced Raman scattering (SERS) substrate of Ag nanocubes monolayer-modified polydimethylsiloxane (Ag NCs/PDMS) through a powerful three-phase interface self-assemble method. The morphologies and crystal structures were characterized by scanning electron microscopy and X-ray diffraction. The self-assembled Ag NCs/PDMS substrate exhibited high SERS activity and good signal homogeneity, which was successfully used for quantitative detection of thiram; the detection limit reached 10 ng/mL, and the linear range is 10–1000 ng/mL. Furthermore, the flexible SERS substrates were successfully employed to detect thiram residues on factual apple samples, and trace amount (1 ng/cm 2 ) of thiram residues was detected on apple peels. The excellent SERS detection ability of self-assembled Ag NCs/PDMS substrate indicated that it will play an important role in pesticide detection in the future. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 11
·8581-8590
·
IF 3.442
Huang Xie-Jun,Zeng Xiao-Fei,Wang Jie-Xin,Zhang Liang-Liang,Chen Jian-Feng
Transparent ZnO/polymer nanocomposites with good UV shielding performance have shown great potential applications. Due to the photocatalytic activity of ZnO, core–shell structure nanoparticles (NPs) have been used to fabricate the transparent polymer-based nanocomposites. However, it is still a challenge to synthesize core–shell structure NPs with small particle size and good dispersity, and difficult to maintain the transparency of the nanocomposites because of Rayleigh scattering caused by the big size or the aggregation of NPs. This article reports a novel reverse microemulsion combined with surface modification method for the synthesis of monodispersed silica-coated ZnO (ZnO@SiO 2 ) NPs, which are introduced into ethocel (EC) matrix to fabricate the transparent nanocomposites by the solution-mixing method. The ZnO@SiO 2 NPs with an average size of 12 nm have an obvious core–shell structure and show excellent monodispersity in toluene. The as-prepared EC/ZnO@SiO 2 nanocomposites shield all the UV light completely under 350 nm and maintain the transparency of pure EC even the solid content reaches 60 parts per hundred of EC resin by weight (phr). Importantly, the photocatalytic activity of ZnO NPs is eliminated thoroughly by the silica shell, which apparently improves the UV aging resistance of polymer (EC), enabling the applications of ZnO as durable and environmental friendly UV blocker in transparent plastics and coatings to extend the lifetime of the products.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2014
·Vol. 25
·期 12
·5395-5402
·
IF 1.966
Lun Kuo,Ma Qianli,Dong Xiangting,Yu Wensheng,Wang Jinxian,Liu Guixia
For the purpose of developing new-typed multifunctional composite nanofibers, novel composite nanofibers with tunable color-electricity bifunctionality have been successfully fabricated via facile one-pot electrospinning technology. The obtained bifunctional composite nanofibers are composed of polyvinyl pyrrolidone (PVP) as the matrix, Tb(BA) 3 phen and Eu(BA) 3 phen (BA = benzoic acid, phen = phenanthroline) as luminescence materials and polyaniline (PANI) as conductive material. Scanning electron microscopy, energy dispersive spectrometry, fluorescence spectroscopy and Hall effect measurement system are used to characterize the morphology structure and properties of the [Tb(BA) 3 phen + Eu(BA) 3 phen]/PANI/PVP composite nanofibers. The results indicate that the bifunctional composite nanofibers possess excellent photo luminescence and electrical conduction. The emitting color of the luminescent composite nanofibers can be tuned by adjusting the mass ratios of Tb(BA) 3 phen, Eu(BA) 3 phen and PANI in a wide color range of red-yellow-green under the excitation of 297-nm single-wavelength ultraviolet light. The electrical conductivity reaches up to the order of 10 −4 S/cm. The luminescent intensity and electrical conductivity of the composite nanofibers can be tunable by adding various amounts of Tb(BA) 3 phen, Eu(BA) 3 phen and PANI. The bifunctional composite nanofibers are expected to possess many potential applications in areas such as color display, electromagnetic shielding, molecular electronics and biomedicine.
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高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 28
·期 1
·74-81
·
IF 1.758
Wang Yuting,You Sijia,Hu Jie,Zhang Kan
Two 3-methytetrahydrophtalimide-functional benzoxazine monomers containing nitrile group have been prepared in order to achieve the basic design rules for developing high-performance thermosets via multifunctional benzoxazines. The chemical structures of the two new synthesized benzoxazine monomers have been confirmed by 1 H NMR, 13 C NMR and FT-IR. Besides, the polymerization behavior has been studied by using DSC and in situ FT-IR. In addition, the thermal stability and flame retardant properties of the resulting polybenzoxazines have also been investigated using TGA and MCC. The polybenzoxazine based on ortho -3-methytetrahydrophtalimide functional benzoxazine containing ortho -nitrile group exhibits excellent thermal stability and low flammability, with a T d 10 of 378 °C and a HRC value of 180 J/(g K).
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Frontiers of Chemical Science and Engineering
·
2021
·Vol. 16
·期 3
·364-375
·
IF 4.204
Wang Ruiqing,Cao Xiaolan,Sui Sheng,Li Bing,Li Qingfeng
The platinum nanowires have been verified to be a promising catalyst to promote the performance of proton exchange membrane fuel cells. In this paper, accurately controlled growth of nanowires in a carbon matrix is achieved for reducing Pt loading. The effects of formic acid concentration and reaction temperature on the morphology and size of the Pt nanowires, as well as their electrochemical performances in a single cell, are investigated. The results showed that the increase in the formic acid concentration results in a volcano trend with the length of Pt nanowires. With increasing reduction temperature, the diameter of Pt nanowires increases while Pt particles evolve from one-dimensional to zero-dimensional up to 40 °C. A mechanism of the Pt nanowires growth is proposed. The optimized Pt nanowires electrode exhibits a power density (based on electrochemical active surface area) 79% higher than conventional Pt/C one. The control strategy obtained contributes to the design and control of novel nanostructures in nano-synthesis and catalyst applications.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 11
·2146-2152
·
IF 1.113
Xu Jinku,Zhang Yongchun
Aligned fibers in micro-/nano-scale have attracted more attention especially in tissue engineering field because cells can orientation growth along the fiber. However, it is still a huge technological challenge in achieving it as a result of the inherent bending instability of an electrospinning jet. Herein, we report a novel and simple spinning approach, in which low dielectric constant of dioxane was judiciously used as solvent for spinning dope, to obtain electrospinning jet with low induced charge, therefore eliminating electrically and aerodynamically driven bending instability, and forming a stable and low forward-moving velocity jet longer than 100 cm. This consequently allows for readily collecting and fabricating individual fibers, well-aligned ultrafine fiber arrays over large areas. Our approach has proved to be effective in preparing well-aligned ultrafine fibers from biodegradable poly(D, L-lactic acid) with different molecular mass, natural polymer acetyl cellulose and synthesized non-biodegradable polymer polystyrene.
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MEDICINAL CHEMISTRY RESEARCH
·
2021
·Vol. 30
·期 10
·1856-1867
·
IF 1.965
Yin Yu-dong,Liu Jing-jing,Liao Wen-fei,Guo Xian-kun,Zhang Li-shan,Mo Wei-bin,Cheng Ke-guang
As 17 β -estradiol and its derivatives have good affinity with estrogen receptors and have unique antitumor properties, O 1 -propargyl- N 4 , N 4 -bis(2-chloroethyl)-4-aminophenol and N 4 , N 4 -dipropargyl- N 1 , N 1 -bis(2-chloroethyl)-1,4-phenylenediamine were respectively combined with 17 β -estradiol through linkers of different lengths. These targeted novel nitrogen mustard 17 β -estradiol derivatives were tested antiproliferative activity using the MTT assay. The results illustrated that these compounds were less toxicity to HL-7702 (human liver cells) and SKOV-3, though all their activity potency was moderate or weak aganist the MDA-MB-231, MCF-7 and BEL-7404 cell lines. The inhibitory activity of the O 1 -propargyl- N 4 , N 4 -bis (2-chloroethyl)-4-aminophenol derivatives (compounds III-1~6 and VII-1~4 ) were obviously better than the N 4 -dipropargyl- N 1 , N 1 -bis (2-chloroethyl) -1,4-phenylenediamine derivatives (compounds IV-1~6 and VIII-1~4 ) against tested tumor cell lines. And three hybrids (compounds III-2 , III-6 , and VII-3 ) exhibited good inhibitory activity against BEL-7404 cell line (IC 50 = 13.5, 15.3 and 13.9 μM, respectively). After that, we performed KEGG pathway analysis on compound III-6 , and the results showed that III-6 mainly induced breast cancer cell apoptosis by regulating the expression of the proteins in NF-κ B pathway.
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危险品化学品经营许可证（带存储）