JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 106
·期 2
·444-454
·
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
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 15
·14391-14404
·
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.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 23
·10047-10055
·
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.
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JOURNAL OF SOLUTION CHEMISTRY
·
2019
·Vol. 48
·期 2
·125-141
·
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.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 9
·1-11
·
IF 6.408
Wang Lin,Wang Beibei,Kang Kai,Ji Xueping,Wang Bing,Li Congwei,Ren Jujie
A new strategy is proposed for ultrasensitive detection of chlorogenic acid (CGA) by fabricating an electrochemiluminescence resonance energy transfer (ECL-RET) sensing platform. The novel system designed by introducing ruthenium-based 2D metal–organic framework nanosheets (Ru@Zn-MOF) as ECL acceptor and L-cysteine capped CdS quantum dots (L-CdS QDs) as ECL donor, exhibited good ECL response. The possible mechanism of the modified electrode surface reaction was discussed. Modifying of the electrode surface by application of L-CdS QDs directly on ultrathin MOF nanosheets greatly shortened the electron-transfer distance and reduce energy loss, therefore significantly improving the ECL efficiency. The prepared sensor demonstrated good stability and highly selective detection of the target molecule. Under optimal conditions, the constructed sensor for the detection of CGA exhibited a wide linear range from 1.0 × 10 −10 to 1.0 × 10 −4 mol·L −1 and a low detection limit of 3.2 × 10 −11 mol·L −1 with a correction coefficient of 0.995. The recovery for spiked samples was calculated to be 94.4–109% and the RSD was 1.07–1.72% in real samples. The obtained sensor is considered to be a promising platform for CGA detection. Graphical abstract Electrochemiluminescence resonance energy transfer (ECL-RET) sensing platform is used for the detection for chlorogenic acid.
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CELLULOSE
·
2020
·Vol. 28
·期 2
·691-701
·
IF 4.21
Wang Ruochun,Rong Liduo,Ni Shujing,Wang Qiankun,Wang Bijia,Mao Zhiping,Feng Xueling,Yuan Jinying,Sui Xiaofeng
A novel approach was developed to prepare cellulose acetoacetate- graft -copolymers via horseradish peroxidase (HRP)-mediated polymerization. Cellulose acetoacetate (CAA), the macroinitiator, was obtained by transesterification between tert -butyl acetoacetate ( t -BAA) and cellulose in ionic liquid. The CAA- graft -polyacrylamide (CAA- g -PAM) was synthesized using a ternary initiator system consisting of CAA, HRP and hydrogen peroxide (H 2 O 2 ). The results of surface-initiated polymerization showed that the formation of free polymers could be inhibited in this process. The kinetics exhibited that this method is a powerful tool for obtaining graft copolymers. The effects of H 2 O 2 concentration and reaction temperature were investigated to explore the optimal conditions for the process of enzymatic initiation. The synthesized copolymers were characterized by FT IR, NMR, TGA and elemental analysis to confirm the successful grafting of polyacrylamide chains onto the cellulose backbones. Furthermore, generality of the HRP-mediated graft polymerization approach was demonstrated using various monomers, including 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA) and sulfobetaine methacrylate (SBMA). This efficient and robust strategy has great potential in fabrication of cellulose-based functional polymers. Graphic abstract Enzymatic grafting polymerization from cellulose acetoacetate
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Food Analytical Methods
·
2019
·Vol. 12
·期 6
·1429-1438
·
IF 2.413
Duan Hui-Ling,Mou Zhao-Li,Wang Jun,Ma Shi-Yao,Zhan Han-Ying,Zhang Zhi-Qi
Two types of magnetically modified porous β-cyclodextrin polymers (PCDPs) were successfully synthesized. The first type, named MPCDPs(C), was fabricated by co-precipitating PCDPs with Fe 3 O 4 , resulting in a Brunauer–Emmett–Teller (BET) surface area of 106.68 m 2 g −1 . The second type, named MPCDPs(M), was fabricated by grafting PCDPs onto the surface of magnetic microspheres, resulting in a BET surface area of 34.63 m 2 g −1 . Both MPCDPs were found to enable effective extraction and separation of Sudan dyes from foodstuffs and environmental water. Coupled with high-performance liquid chromatography, the limits of detection for Sudan dyes were in the range of 0.013–0.054 ng mL −1 with MPCDPs(C), and 0.028–0.039 ng mL −1 with MPCDPs(M). Recoveries were between 85.8 and 102.8% for spiked food samples and 88.3 and 103.2% for spiked water samples, suggesting that the developed methods are promising for accurate quantification of Sudan dyes at trace levels in foodstuffs and environmental water.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 14
·7276-7289
·
IF 4.682
Wang Yonghan,Hu Feng,Chen Ying,Wang Hui,Fetohi Amani E.,Hao Yanan,Li Linlin,El-Khatib K. M.,Peng Shengjie
Electrocatalytic conversion from carbon dioxide with main products of carbon monoxide and hydrogen provides an economic and sustainable pathway to produce syngas, while the involved electrocatalysts with high activity and stability as well as highly tunability for CO/H 2 ratio are still rare. Here, we report a facile method to prepare palladium (Pd) nanoparticle ensembles with unique three-dimentional (3D) architecture and porosity as well as plenty of grain boundaries, which are electrocatalytically active for electrochemical carbon dioxide reduction (eCO 2 RR) to syngas. At the potential of − 0.8 V (versus reversible hydrogen electrode), the CO selectivity of such Pd nanoparticle ensembles is up to ca. 90% and the CO/H 2 ratio can be adjusted from one to six by varying the applied potentials. The syngas production on Pd nanoparticle ensembles can be further regulated by changing the reaction temperature and modified ligands. This method for fabricating Pd nanoparticle ensembles with rational tenability paves the way for the fundamental research and commercial deployment of eCO 2 RR and syngas production. Graphical abstract Pd nanoparticle ensembles with grain boundaries and high porosity were developed for tunable CO 2 conversion to syngas under ligand exchange and temperature control.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 26
·期 1
·269-280
·
IF 2.647
Li Xueying,Wang Jiangang,Duan Fenyan,Tao Luwen,Xu Teng,Chen Lizhuang,Yuan Aihua,Wang Xiaolong
The electrode materials with long cycle life are important for the large-scale application of sodium ion batteries. In this work, P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0, 0.057, 0.073, 0.09) were synthesized by molten-salt method. The Ti doping content could influence the crystallographic unit cell volume, particle size, oxygen vacancies, and surface charge density of those samples. When x = 0.073, the P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0.073) exhibits superior reversible capacity and rate performance due to the appropriate synergistic effect. In particular, the initial discharge capacity of NCTO-0.073 is about 118.5 mAh g −1 at 100 mA g −1 . Even the current density gets to 1000 mA g −1 , the initial discharge capacity remains 71.7 mAh g −1 after 1000 cycling with the capacity retention of 67.90%. The electrochemical kinetics analysis further prove that the P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0.073) owns outstanding electrical conductivity and fast sodium ion diffusion behavior to promote the electrochemical reaction during the charging/discharging. These results will contribute to the industrialized application of stable high-performance cathodes for sodium ion batteries.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
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
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12801-12810
·
IF 3.553
Cao Sheng,Dai Chencheng,Yao Shangfei,Zou Bingsuo,Zhao Jialong
In recent years, light-emitting Mn 2+ -doped nanocrystals (NCs) have been widely studied because of their strong and stable Mn 2+ d–d emission. Herein, highly efficient colloidal Mn 2+ -doped Cd–In–S NCs were prepared by a hot injection strategy. The as-prepared NCs have a cubic crystal structure of CdS host and exhibit strong Mn 2+ emission. The photoluminescence (PL) intensity, PL position, and PL lifetime of this Mn 2+ emission can be adjusted by changing the doping level of Mn 2+ . In particular, by tuning the amount of dopant, the emission color can be varied in the range of 601 nm to 643 nm, which is due to the coordination field environment of Mn 2+ ions changed by the doping concentration. The PL intensity of Mn 2+ is significantly enhanced by the ZnS shell coating, and the highest PL quantum yield can reach 56%, which is attributed to the removal of NCs surface-related defects by shell modification. A prototype LED was fabricated as well by using the as-prepared highly efficient Mn 2+ -doped Cd–In–S NCs as a color conversion material. The Mn 2+ -doped multicomponent semiconductor NCs reported here extend the availability of classical Mn 2+ -doped luminescent materials and provide alternatives for other applications requiring orange-red colloidal NCs.
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 11
·1695-1702
·
IF 1.931
Xu Lu,Jin Hongjuan,Wu Di,Liu Baijun,Zhang Mingyao
In this work, monodisperse positively charged polystyrene (PS) particles with a particle size of 900 nm were prepared by dispersion polymerization using methacryloxyethyltrimethyl ammonium chloride (DMC) as a cationic comonomer. The polystyrene/silica (PS/SiO 2 ) composite microspheres with a raspberry structure are formed by electrostatic adsorption prepared using positively charged PS adsorbed negatively charged silicon dioxide (SiO 2 ). A novel superhydrophobic coating was constructed by a dip-coating method. Then, the coating film was immersed in a solution of heptadecafluorodecyl trimethoxysilane in n-hexane (0.1 wt%) to carry out surface superhydrophobic modification. Finally, a superhydrophobic coating with 158° static contact angle and 3° sliding angle was obtained. In addition, by adding divinylbenzene (DVB) and changing the amount and size of SiO 2 , the effect of the roughness level and cross-linking structure of raspberry particles on the hydrophobic properties of the coating was studied. Graphical abstract Mechanism diagram of superhydrophobic coating prepared by PS/SiO 2 composite particles.
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危险品化学品经营许可证（带存储）