Changzhou UniversityJiangsu

Changzhou, China

Changzhou UniversityJiangsu

Changzhou, China
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Zhai B.-G.,Changzhou UniversityJiangsu | Yang L.,Changzhou UniversityJiangsu | Ma Q.-L.,Nantong University | Liu X.,Changzhou UniversityJiangsu | Huang Y.M.,Changzhou UniversityJiangsu
Journal of Luminescence | Year: 2017

Significant prolongation in the green afterglow of SrAl2O4:Dy3+ was achieved by adding 10 mol% H3BO3 into the starting material. The surface morphology, crystalline structure, chemical composition, photoluminescence, afterglow and decay characteristics of the phosphor were characterized by scanning electron microscopy, X-ray diffractometry, energy-dispersive X-ray spectroscopy, transmission electron microscopy, photoluminescence and photoexcitation spectroscopy, respectively. It was found that the afterglow time constant of the green afterglow from SrAl2O4:Dy3+ phosphor could be enhanced over 100 folds from 53 to 5538 s after the addition of 10 mol% H3BO3 flux. No traces of Eu were found in the phosphors within the 1 μg/g detection limit of the inductively coupled plasma atomic emission spectrometry. By employing meta generalized gradient approximation to describe the exchange–correlation functional, the band structures of SrAl2O4:Dy3+ were calculated within the framework of density functional theory. The ground state of Dy3+ ions and the defect levels of VO ••, VSr ″ and VAl ″′ were quantitatively determined in the band gap of SrAl2O4. A possible afterglow mechanism was proposed to shed fresh light on the green afterglow of SrAl2O4:Dy3+. The significant prolongation in the afterglow of SrAl2O4:Dy3+ can be attributed to the H3BO3 flux introduced VAl ″′ in the host lattice. © 2016 Elsevier B.V.

Fan S.,Changzhou UniversityJiangsu | Wu C.,Changzhou UniversityJiangsu | Liu Y.,Changzhou UniversityJiangsu | Tu H.,Changzhou UniversityJiangsu | And 2 more authors.
Journal of Alloys and Compounds | Year: 2017

A series of Zn–Ce–Ti alloys was designed to investigate the 600 and 450 °C isothermal sections of the Zn–Ce–Ti system based on examination by Scanning Electron Microscope (SEM) equipped with Energy Dispersive X-ray Spectrometer (EDS) and X-ray Powder Diffraction (XRD). No ternary compounds were found in the system. Twelve 3-phase regions were identified at 600 °C and thirteen 3-phase regions at 450 °C. Ce does not dissolve in any of Ti–Zn binary compounds and the solubility of Ti in Ce–Zn binary compounds was less than 1.0 at.%. TiZn3 phase can equilibrate with CeZn11, Ce2Zn17, and Ce3Zn22, while TiZn can achieve equilibrium with Ce3Zn22, CeZn5, Ce13Zn58, and Ce3Zn11. Differential thermal analysis results together with SEM-EDS analysis proved that the decomposition temperatures of TiZn16 and Ti3Zn22 were 461.8 and 613.1 °C, respectively. © 2017 Elsevier B.V.

Wu C.,Changzhou UniversityJiangsu | Wu C.,Pohang University of Science and Technology | Lee B.-J.,Pohang University of Science and Technology | Su X.,Changzhou UniversityJiangsu
Calphad: Computer Coupling of Phase Diagrams and Thermochemistry | Year: 2017

A semi-empirical interatomic potential formalism, the second-nearest-neighbor modified embedded-atom method (2NN MEAM), has been applied to obtaining interatomic potentials for the Fe-Ni, Cr-Ni and Fe-Cr-Ni systems using previously developed MEAM potentials of Fe and Ni and a newly revised potential of Cr. The potential parameters were determined by fitting the experimental data on the enthalpy of formation or mixing, lattice parameter and elastic constant. The present potentials generally reproduced the fundamental physical properties of the Fe-Ni and Cr-Ni alloys. The enthalpy of formation or mixing of the disordered phase at finite temperature and the enthalpy of mixing of the liquid phase are reasonable in agreements with experiment data and CALPHAD calculations. The potentials can be combined with already-developed MEAM potentials to describe Fe-Cr-Ni-based multicomponent alloys. Moreover, the average diffusivities in the unary, some binary and ternary alloys were simulated based on present potential. Good agreement is obtained in comparison with experimental data. © 2017 Elsevier Ltd

Li H.,Jiangsu University of Science and Technology | Li H.,Changzhou Institute of Technology | Zou J.,Jiangsu University of Science and Technology | Yao J.,Jiangsu ASWEMET Precision Technology Co. | Peng H.,Changzhou UniversityJiangsu
Journal of Alloys and Compounds | Year: 2017

2219 aluminum alloy was mainly used in the propellant tanks of domestic aerospace vehicles. Porosity was often observed during the VPTIG welding joint of the 2219 aluminum alloy. The new welding technology under condition of direct current electrode negative A-TIG (DCEN A-TIG) welding using a special active agent (AlF3, LiF, KF-AlF3, K2SiF6) had eliminated the welding porosity of 2219 aluminum alloy. DCEN A-TIG welding and VPTIG welding of 2219 aluminum alloy were performed. Compared with VPTIG welding, the current decrease of DCEN A-TIG welding had greatly reduced thermal effect on base metal and heat-affected zone. The DCEN A-TIG technology had prevented welding porosity, while VPTIG welding had contained numerous macro and micro porosity. The weakest part of the DCEN A-TIG welding joint was the fusion zone, however, the VPTIG joint mainly ruptured in the weld zone due to significant porosity defect. The grain sizes of the welding zone in VPTIG welding were coarser than those in DCEN A-TIG welding, which can reach the same mechanical performance index with VPTIG welding. © 2017 Elsevier B.V.

Jin C.,Changzhou UniversityJiangsu | Jin C.,Jilin University | Ma X.,Changzhou UniversityJiangsu | Zhang J.,Changzhou UniversityJiangsu | And 2 more authors.
Electrochimica Acta | Year: 2014

The surface modification of Pt/C catalyst with Ag and the electrocatalytic oxidation of ethanol on the Ag-modified Pt/C catalysts are investigated. The Ag-modified Pt/C catalysts are prepared by means of the potentiostatic deposition of Ag on the Pt nanoparticles loaded on carbon black and coated on glassy carbon (GC) electrodes. Instrumental analysis and electrochemical analysis show that the metal nanoparticles are well distributed on carbon black and the surface of the Pt nanoparticles is partially covered by Ag. Cyclic voltammetric (CV) results display that the deposition of Ag leads to a significant improvement in the activity of Pt/C for ethanol oxidation in alkaline solution. In a wide range of Ag loadings, the Ag-modified Pt/C catalysts show more negative onset oxidation potential and much higher peak current density than the Pt/C catalyst, though Ag has no catalytic activity for ethanol oxidation. © 2014 Elsevier Ltd. All rights reserved.

Jin C.,Changzhou UniversityJiangsu | Jin C.,Jilin University | Zhu J.,Changzhou UniversityJiangsu | Dong R.,Changzhou UniversityJiangsu | Huo Q.,Jilin University
Electrochimica Acta | Year: 2016

The partial surface modification of reduced graphene oxide-supported Pt nanoparticles with a small amount of Au and the electrooxidation of ethylene glycol and glycerol on Au-modified Pt nanoparticles/reduced graphene oxide (Au/Pt/RGO) catalysts have been investigated. The deposition of Au on Pt/RGO was performed electrochemically, and Au/Pt/RGO catalysts with the Au:Pt atomic ratio of 1:74, 1:41 and 1:20 were prepared. The characterization of catalysts showed the coverage from 4 to 17% of the Pt surfaces by Au adatoms. The Au/Pt/RGO catalysts have the property reflecting the features of both Pt and Au, but behave more similar to Pt/RGO in ethylene glycol oxidation and to Au/RGO in glycerol oxidation. Furthermore, the Au/Pt/RGO catalysts exhibit higher activity than Pt/RGO and Au/RGO in the two reactions. The significant change in the activity of Pt/RGO by the surface modification with a small amount of Au and the different performances of Au/Pt/RGO in the oxidation of ethylene glycol and glycerol are of significance for practical application and theoretical investigation. © 2016 Elsevier Ltd. All rights reserved.

Ma J.,Changzhou UniversityJiangsu | Ma J.,Pennsylvania State University | Huang D.,Changzhou UniversityJiangsu | Zhang W.,Changzhou UniversityJiangsu | And 4 more authors.
Chemosphere | Year: 2016

Novel visible-light-driven heterojunction photocatalyst comprising exfoliated bentonite, g-C3N4 and Ag3PO4 (EB/g-C3N4/Ag3PO4) was synthesized by a facile and green method. The composites EB/g-C3N4/Ag3PO4 were characterized by X-ray diffraction, Transmission electron microscopy, Fourier transform infrared spectroscopy, UV–Vis diffuse reflectance spectroscopy and the Brunauer, Emmett, and Teller (BET) surface area method. Under visible light irradiation, EB/g-C3N4/Ag3PO4 composites displayed much higher photocatalytic activity than that of either pure g-C3N4 or pure Ag3PO4 in the degradation of Rhodamine B (RhB). Among the hybrid photocatalysts, EB/g-C3N4/Ag3PO4 composite containing 20 wt% Ag3PO4 exhibited the highest photocatalytic activity for the decolorization of RhB. Under the visible-light irradiation, the RhB dye was completely decolorized in less than 60 min. The enhanced photocatalytic performance is attributed to the stable structure, enlarged surface area, strong adsorbability, strong light absorption ability, and high-efficiency separation rate of photoinduced electron-hole pairs. Our finding paves a way to design highly efficient and stable visible-light-induced photocatalysts for practical applications in wastewater treatment. © 2016 Elsevier Ltd

Zhai B.-G.,Changzhou UniversityJiangsu | Ma Q.-L.,Changzhou UniversityJiangsu | Ma Q.-L.,Nantong University | Xiong R.,Wuhan UniversityHubei | And 2 more authors.
Materials Research Bulletin | Year: 2016

Dy3+ doped barium aluminate (BaAl2O4:Dy3+) phosphors were prepared via the sol-gel combustion route at the ignition temperature of 600 °C. The phosphors were characterized with X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, photoluminescence spectroscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Regardless of the absence of Eu2+ luminescent centers, broadband blue-green afterglow with its peak at about 490 nm was recorded in the BaAl2O4:Dy3+ phosphors. The decay profile of the blue-green afterglow can be best fitted into a two-component exponential function with the two lifetime decay constants to be 8.81 and 45.25 s, respectively. The observation of blue-green afterglow from BaAl2O4:Dy3+ in the absence of Eu2+ provides unique opportunity in unveiling the afterglow mechanisms of rare-earth doped alkaline-metal aluminates. Possible mechanisms on the blue-green afterglow in BaAl2O4:Dy3+ phosphors are discussed in terms of the Dy3+ ions introduced trap centers as well as luminescent centers in the crystal lattice. © 2015 Elsevier Ltd.

Huang W.,Changzhou University | Huang W.,Pennsylvania State University | Komarneni S.,Pennsylvania State University | Aref A.R.,Pennsylvania State University | And 6 more authors.
Chemical Communications | Year: 2015

Herein, we report a unique tin phosphate that is remarkably selective to 137Cs+ from extremly acidic solutions because of its special layered structure with an unusually large interlayer space. This acidic exchanger is superior to other existing materials in terms of its selectivity and capacity for 137Cs+ from acidic solutions. © The Royal Society of Chemistry.

Han C.-M.,Changzhou UniversityJiangsu | Zhou X.-Y.,Capital Medical University | Cao J.,Changzhou UniversityJiangsu | Zhang X.-Y.,Capital Medical University | Chen X.,Changzhou UniversityJiangsu
Bioorganic Chemistry | Year: 2015

In the presence of K2CO3/Cs2CO3 (molar ratio 10:1), garcinol was subjected to methylation by reaction with iodomethane at room temperature to afford 13,14-dimethoxy garcinol. The methylated garcinol derivative was screened against oral cancer cell line SCC15 for cell proliferation and apoptosis. 13,14-Dimethoxy garcinol showed weaker inhibitory activity on SCC15 cell growth than garcinol, and had little effect on cell cycle and apoptosis of SCC15, whereas garcinol effectively induced cell cycle arrest and cell apoptosis. Meanwhile, the ELISA data showed that the inhibitory effect of garcinol on 5-Lox pathway was more potent than 13,14-dimethoxy garcinol (P < 0.05). All these results have confirmed the important role of 13,14-dihydroxy groups for anti-cancer effects of garcinol. © 2015; Elsevier Inc. All rights reserved.

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