JOURNAL OF SOLUTION CHEMISTRY
·
2019
·Vol. 48
·期 2
·125-141
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IF 1.039
Wei Ying,Zhang Wenbo,Zhang Xinyuan,Yang Huige,Zhang Qingguo
In the present work, a new binary mixture system composed of the ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([Emim][CF 3 SO 3 ]) and propylene carbonate (PC) was prepared. The densities, dynamic viscosities, and electrical conductivities of ([Emim][CF 3 SO 3 ] + PC) were measured over the whole concentration range (mole fractions of IL from 0 to 1) for temperatures from 288.15 to 353.15 K. The excess molar volumes ( V E ) and viscosity deviations (Δ η ) of the binary systems were calculated to characterize the volume contraction and intermolecular interactions in the mixture system, and both were correlated with the Redlich–Kister polynomial equation. The Vogel–Fulcher–Tamman equation was used to describe the temperature dependences of the dynamic viscosities and the electrical conductivities of the binary system. Further, density functional theory calculations were employed to obtain the structure, energy, and COSMO charge distributions of the cation and anion of the IL and the PC molecule, and the intermolecular interactions in the binary mixture system were evaluated.
研究领域:
物理化学
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材料科学
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 106
·期 2
·444-454
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IF 2.606
Zhang Ji,Mu Chengfa,Shen Tao,Qi Gengxin
Different micro-structured SnO 2 powders were synthesized by hydrothermal and chemical co-precipitation methods. The influence of milling process and sintering parameters on the physical properties of Ag/SnO 2 electrical contact materials was investigated. The microstructure and physical properties of Ag/SnO 2 electrical contact materials were characterized by X-ray Diffraction, Scanning Electron Microscopy and Conductivity analyzer. The results showed that spherical SnO 2 (s) powders with a diameter about 2 μm were synthesized. With increased milling time, there was a slight decrease in the average sizes of Ag/SnO 2 (s) powders, but no significant difference. The optimal density of 9.545 g∙cm −3 and resistivity of 2.67 μΩ∙cm of Ag/SnO 2 (s) electrical contact materials were obtained after sintering at 860 °C for 6 h in air atmosphere. The promotion of sintering densification and improvement of physical properties of Ag/SnO 2 (s) contact may be due to the combined effects of mechanical activation energy and higher sintering temperature. Using the finite element method, simulation models were developed to interpret the effects of different micro-structured SnO 2 powders on the physical properties of Ag/SnO 2 materials.
Graphical abstract
研究领域:
材料科学
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电气工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 23
·10047-10055
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IF 3.553
Lu Pengqi,Wang Yao,Xu Hanlun,Wang Xiaoyu,Ali Nasir,Zhu Jiaqi,Wu Huizhen
Two-dimensional crystals-based surface-enhanced Raman scattering (SERS) substrates are a research hot spot in the realm of chemistry and biology. Herein, a novel hybrid substrate based on AuNPs/GaTe/Au-film is proposed and fabricated for SERS activity. Finite-difference time-domain numerical simulations demonstrate that the plasmonic coupling in the hybrid structure, particularly the LSPs coupling of AuNPs and Au-film, promotes an enhanced electric field and consequently, greatly enhances the Raman activity. Impressively, the enhancement factor of 3 × 10 5 and the limiting detection concentration of 10 −14 M have been achieved for the rhodamine 6G molecules, which are equivalent to the best results achieved from the patterned graphene substrates. Due to its simple structure, cost-effectiveness, good uniformity, reproducibility, and stability, it is expected that such a SERS substrate will open up a new way toward the ultrasensitive detection of molecules.
研究领域:
化学
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生物学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 36
·17247-17264
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IF 4.682
Zhou Dong,Hu Shuyu,Xie Chen,Xu Shiqing,Xu Jing,Li Rong,Hu Pengfei
The room-temperature mechanochemical synthesis method was employed to fabricate the AgCl@Ag-NPs and AgCl@AgNPs/TiO 2 composite photocatalysts efficiently. The polyethylene glycol 400 was introduced to adjust the microstructure and layout of nanoparticles to form a large number of heterojunctions or even heterojunction chains between Ag-NPs and AgCl/TiO 2 . The surface plasmon resonance effect of metallic silver nanoparticle extends the absorption spectrum of composite to the visible region. And the metal–semiconductor heterojunction configuration enables the effective separation of electron–hole pairs to endow them strong catalytic activity for degradation of oxytetracycline under man-made natural light irradiation and, meanwhile, suppresses the bleaching of AgCl to give them good microstructural stability and photocatalytic reusability. In the process of photodegradation of oxytetracycline, AgCl@AgNPs/TiO 2 showed the higher catalytic efficiency through fuller synergy compared to AgCl@AgNPs. This work lays out a green degradation strategy for antibiotics in the ecological environment. Graphical abstract
研究领域:
材料科学
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环境科学
·
光催化
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 15
·14391-14404
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IF 2.195
Yu Xuemin,Wang Junchuan,Sun Ying,Zhang Xueqin,Lin Baoping
A series of nanocomposite films loaded with various concentrations of fillers were successfully synthesized by solution casting method (BSCTZS nanoparticles (NPs) as filler and polyimide (PI) as polymer matrix). To improve the dispersion and the physical–chemical properties of (Ba 0.87 Sr 0.04 Ca 0.09 )(Ti 0.86 Zr 0.08 Sn 0.06 )O 3 (BSCTZS) NPs surface, BSCTZS NPs were modified by Al 2 O 3 coating and modified Al 2 O 3 @Nb-BSCTZS NPs/PI nanocomposite films were prepared. The prepared modified Al 2 O 3 @Nb-BSCTZS NPs were characterized by X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM), and the dielectric properties of these composites were characterized in details. As a result, the nanocomposite films filled with 5 vol% Al 2 O 3 @0.4mol%Nb-BSCTZS nanoparticles exhibit an excellent energy density of 2.11 J cm −3 at 298 kV/mm, which is 48% over the original pristine PI (1.42 J cm −3 at 313 kV/mm). This work can provide a prospective solution for the preparation of composite film materials with high dielectric constant and high energy density.
研究领域:
材料科学
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纳米技术
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电气工程
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DOI
高影响因子
MRS Communications
·
2022
·Vol. 12
·期 5
·824-830
·
IF 2.935
Zhuang L. H.,Pei L. Z.,Jiang C. H.,Chen X.,Zhang Y.
Zinc bismuthate/bismuth oxide nanocomposites have been prepared by one-step precipitation method. Zinc bismuthate/bismuth oxide nanocomposites were used as the electrode-modified materials for the benzoic acid electrochemical sensors. The electrochemical properties were analyzed by electrochemical impedance spectroscopy and cyclic voltammetric (CV) method. The results show that the intensity of the CV peaks increases obviously with the increase of benzoic acid concentration and scan rate. The sensor based on the zinc bismuthate/bismuth oxide nanocomposites shows a low detection limit of 0.053 µM at a signal-to-noise ratio of 3, a wide linear range of 0.0002–2 mM, good reproducibility, and stability. Graphical abstract
研究领域:
材料科学
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分析化学
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DOI
高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 2
·1057-1068
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IF 2.87
Zhang Yue-Fei,Tang Jian,Li Tao,Liu Yun,Li Yan
In this paper, the polymerization of acrolein (A) via UV-mediated atom transfer radical polymerization (ATRP) is reported. The optimization of the experimental conditions of the polymerization is investigated, and it shows that dimethyl sulfoxide as solvent, ethyl 2-bromoisobutyrate (EBIB) and fluorescein (FL) as catalyst, and [A] 0 /[EBIB] 0 /[FL] 0 = 200/1/0.1 in the period of 5 h at 47 °C are suitable conditions for the reaction. In this way, the yield of the polymer is 24.5%. The glass transition temperature and melting point of polyacrolein characterized by differential scanning calorimetry are 115.5 °C and 165.7 °C, respectively. At low conversion, the polymerization conforms to be the first-order kinetics reaction. The dependence of polymerization on light source is proved by “on/off” light source experiment. In short, this study opens up a new way for the ATRP of acrolein, and the polyacrolein with abundant aldehyde groups can be used in the fields of biomedical labeling, immobilization carrier and adsorption of organic amines. Graphic abstract
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 12
·2805-2813
·
IF 3.637
Li Wang,Zhang Xiaoyue,Miao Chunyue,Li Ruijun,Ji Yibing
Paper-based devices have been very much in the foreground of analytical science recently. This work innovatively proposed a fluorescent paper–based sensor (FPS) constructed on a hybrid polydimethylsiloxane (PDMS)/paper platform where cellulose papers functionalized with carbon dots (CDs) as fluorophores by Schiff base chemistry were loaded on the grooves array of a designed PDMS plate. As a proof of concept, the performance of FPS was investigated with folic acid (FA) as the target analyte. Under optimal conditions, FPS enabled a rapid fluorescence quenching response to FA via inner filter effect in a wide range of 1–300 μmol L −1 with the limit of detection of 0.28 μmol L −1 . The feasibility of FPS was further verified by the detection of FA in orange juice and urine samples with satisfactory results. The covalent modification of CDs on paper endowed the FPS with good assay reproducibility and stability. Interestingly, FPS achieved a more sensitive assay of FA than the conventional strategy, by which the same CDs were directly used to detect FA in a solution-based system. The FPS illuminated a novel strategy for construction of reliable and sensitive assays based on paper-based devices. It is of paramount importance for its practical application in biosensing and clinical diagnosis.
Graphical abstract
研究领域:
分析化学
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生物传感
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临床诊断
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 98
·期 2
·389-400
·
IF 2.326
Liu Ting,Liu Qun,Liu Yuan,Yao Hang,Zhang Zhihua,Wang Xiaodong,Shen Jun
With SiO 2 gel as the main skeleton material, the surface modification with methyl acrylate (MA) and tetraethylenepentamine (TEPA) was carried out by Michael addition and substitution reaction, after CO 2 supercritical drying TEPA and MA modified SiO 2 aerogel (TEPA–MA–SA aerogel) was obtained. The sample exhibited selectivity and enormous adsorption capacities for Cu 2+ (218.57 mg g –1 ). The removal rate of Cu 2+ in ternary-mixed metal solution reached 49.29%, ranking first among the materials we have known. MA and TEPA both contain rich groups such as –NH 2 and –NH–, which provide abundant adsorption sites for adsorbing heavy metal ions. BET test showed that the specific surface area, the pore volume, and the pore diameter was 190.2 m 2 g −1 , 4.426 cm 3 g −1 and 9.306 nm respectively. The above properties facilitated capture for Cu (II). The adsorption data were fitted with Langmuir and Freundlich adsorption isotherm models, and both models could describe the adsorption process. However, according to the fitting parameters, Langmuir adsorption isotherm model explicates the adsorption process better. Although the pore structure and specific surface area are beneficial to the physical adsorption, chemical chelation still plays a major role. XPS analysis further proved the possible adsorption mechanism that N and O atoms adsorb Cu (II) ions through chelation. Altogether, TEPA–MA–SA aerogel is suitable as an auxiliary adsorbent to purify contaminated water.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Flow Chemistry
·
2021
·Vol. 12
·期 2
·153-160
·
IF 2.786
Liu Lanshan,Hong Xinlin,Hu Xiaohong
4-pyridinemethanol is well known as an important pharmaceutical intermediate and chemical raw material. Its preparation by electrochemical method has seen a recent explosion of interest. In this paper, we report the synthesis of 4-pyridinemethanol by electrochemical reduction of ethyl isonicotinate using an undivided flow electrolysis cell. The experiments were conducted under different conditions, including applied charge, initial concentration of ethyl isonicotinate and H 2 SO 4 , current density, and electrode materials. The yield of 4-pyridinemethanol reached up to 71 % under the optimal conditions. The oxidation of target product was avoided by using Ti/IrO 2 anode in the absence of membrane separation. Furthermore, the repeat cycle experiments and cyclic voltammetric experiments showed that this approach possessed good reproducibility and stability.
研究领域:
有机化学
·
制药工程
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DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-11
·
IF 6.232
Guo Hao,Wu Ning,Xue Rui,Liu Hui,Wang Mingyue,Yao Wenqin,Wang Xiaoqiong,Yang Wu
An Eu(III)-functionalized strontium-organic framework (Eu 3+ @Sr-MOF) was synthesized by encapsulating Eu 3+ ions into the pores of Sr-MOF via postsynthetic modification (PSM) and fully characterized by XRD, SEM, EDS, FTIR, and TGA. The luminescent properties of Eu 3+ @Sr-MOF were measured and investigated in detail, which demonstrated that Eu 3+ @Sr-MOF not only possessed excellent water and chemical stabilities in a wide pH range (5–10) but also displayed red luminescence with excitation/emission maxima at 332/617 nm. The Eu 3+ @Sr-MOF can be considered as a highly selective and sensitive recyclable luminescence probe for sensing Cr(III) and Cr(VI) based on strong luminescence quenching effects; it can be recycled at least five times. The luminescence probe for Cr 3+ , CrO 4 2− , and Cr 2 O 7 2− shows low detection limits (0.15 μM, 0.17 μM, and 0.13 μM, respectively), relatively broad linear ranges (0.6–150 μM, 0.1–200 μM and 0.4–180 μM, respectively), and high quenching constants K SV . The signals can be observed by the naked eye under UV light of 365 nm. The method was applied to the determination of total Cr in environmental water samples.
Graphical abstract
研究领域:
分析化学
·
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 36
·1-10
·
IF 2.8
Li Heming,Wang Xinming,Wu Tao,Gong Yuze,Zhao Hongbin,Liu Zhaobin,Dastan Davoud,Ma Ke,Hu Zhizhi
Communication industry has developed relying on technological advancement in microelectronics and large-scale integrated circuits. Modified polyimide (MPI) materials with low dielectric loss, relatively simple fabrication process, and cost-effectiveness have significant social and economic benefits. In this work, 6FAPB and 6FDA were used to polymerize fluorinated PI films by thermal imidization, and SiO 2 was used to modify PI films for further obtaining low dielectric constant ( ε )/loss (tan δ ) and enhance mechanical properties. The values of dielectric constant ( ε ) and tan δ were 2.75 and 0.00491, respectively, under 10 GHz. Meanwhile, the elastic modulus of MPI films was enhanced by the SiO 2 adding process, with a maximum tensile modulus of 2.42 GPa. The results indicate that low polarity Si–O–Si bonds lead to a decrease in overall polarity of PI films and lead to tan decrease. This work provides a simple method to increase mechanical properties and reduce the dielectric constant/loss (at 10 GHz high frequency) of PI film by introducing trifluoromethyl and SiO 2 .
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）