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Taishan University

Tai'an, China
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Zheng Z.-B.,Beijing Normal University | Zheng Z.-B.,Taishan University | Duan Z.-M.,Beijing Normal University | Ma Y.-Y.,Beijing Normal University | Wang K.-Z.,Beijing Normal University
Inorganic Chemistry | Year: 2013

The anion-interaction properties of a Ru(II) complex of [Ru(bpy) 2(Htppip)](ClO4)2·H2O· DMF (RuL) {bpy =2,2′-bipyridine and Htppip =2-(4-(2,6-di(pyridin-2-yl) pyridin-4-yl)phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline} were thoroughly investigated in CH3CN and CH3CN/H2O (50:1, v/v) solutions by UV-visible absorption, emission, and 1H NMR spectra. These analyses revealed that RuL acts as an efficient "turn on" emission sensor for H2PO4 -, and a "turn off" sensor for F- and OAc-; in addition, RuL exhibited slightly disturbed emission spectra in the presence of the other anions studied (Cl-, Br-, I-, NO 3 -, and ClO4 -). The cation-sensing properties of RuL were also studied in both neat CH3CN and aqueous 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid buffer (pH = 7.2)/CH 3CN (71/1, v/v) solutions. RuL was found to exhibit a colorimetric sensing ability that was highly selective for Fe2+, as evidenced by an obvious color change from pale yellow to light red-purple to the naked eye over the other cations studied (Na+, Mg2+, Ba 2+, Mn2+, Fe3+, Co2+, Ni 2+, Cu2+, Zn2+, Cd2+, Hg 2+, and Ag+). To obtain insights into the possible binding modes and the sensing mechanisms, 1H NMR spectral analysis, luminescence lifetime measurements, and density functional theoretical calculations were also performed. © 2013 American Chemical Society.

Liu Q.,Taishan University | Ai H.,Shandong University of Science and Technology | Li Z.,Taishan University
Ultrasonics Sonochemistry | Year: 2011

Potassium sorbate has been utilized as a novel, efficient and green catalyst for the Knoevenagel condensation of aromatic aldehydes with active methylene compounds to afford substituted ole-fins through the conventional stirring or under ultrasound irradiation. Improvements were observed by carrying out the reactions under ultrasound irradiation. The advantages of this procedure are mild reaction conditions, high yields, cleaner reaction profiles and operational simplicity. © 2010 Elsevier B.V.

Huang Y.F.,National Taiwan University | Chiueh P.T.,National Taiwan University | Kuan W.H.,Taishan University | Lo S.L.,National Taiwan University
Applied Energy | Year: 2013

A common way to research thermal conversion processes is through the analysis of chemical kinetics. In this article, a semi-quantitative method was established to calculate the chemical kinetics of biomass pyrolysis through differential and integral routes by using the thermal analysis-mass spectrometry (TA-MS) signals of pyrolytic products. The method can be applicable when there is a difficulty in quantitative analysis. Kinetic parameters calculated by the method were compared with those determined by thermogravimetric data. The accuracy and precision of the method may be improved by increasing the frequency of data recording or product sampling. The method should be widely applicable as long as the instrumental signals of products are sufficient and satisfactory. Therefore, various reactions can be comprehensively discussed and understood. © 2013.

Wang L.,CAS Changchun Institute of Applied Chemistry | Wang L.,University of Chinese Academy of Sciences | Zhuo L.,Taishan University | Zhang C.,CAS Changchun Institute of Applied Chemistry | Zhao F.,CAS Changchun Institute of Applied Chemistry
Chemistry - A European Journal | Year: 2014

A composite of highly dispersed Fe3O4 nanoparticles (NPs) anchored in three-dimensional hierarchical porous carbon networks (Fe 3O4/3DHPC) as an anode material for lithium-ion batteries (LIBs) was prepared by means of a deposition technique assisted by a supercritical carbon dioxide (scCO2)-expanded ethanol solution. The as-synthesized Fe3O4/3DHPC composite exhibits a bimodal porous 3D architecture with mutually connected 3.7 nm mesopores defined in the macroporous wall on which a layer of small and uniform Fe3O 4 NPs was closely coated. As an anode material for LIBs, the Fe 3O4/3DHPC composite with 79 wt % Fe3O 4 (Fe3O4/3DHPC-79) delivered a high reversible capacity of 1462 mA h g-1 after 100 cycles at a current density of 100 mA g-1, and maintained good high-rate performance (728, 507, and 239 mA h g-1 at 1, 2, and 5 C, respectively). Moreover, it showed excellent long-term cycling performance at high current densities, 1 and 2 A g-1. The enhanced lithium-storage behavior can be attributed to the synergistic effect of the porous support and the homogeneous Fe 3O4 NPs. More importantly, this straightforward, highly efficient, and green synthetic route will definitely enrich the methodologies for the fabrication of carbon-based transition-metal oxide composites, and provide great potential materials for additional applications in supercapacitors, sensors, and catalyses. Expansion plan: A simple, efficient, and green strategy for the synthesis of Fe3O4 nanoparticles anchored in three-dimensional hierarchical porous carbon networks with the assistance of CO2-expanded ethanol has been developed. The composites exhibited high reversible capacity, good long-term stability, and good rate capability for Li-ion batteries (see figure). © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

In this paper, we performed the design on the structure of white organic light-emitting diodes (WOLEDs). Use of a tandem structure based on lithium fluoride (LiF)-doped 4,7-diphenyl-1,10-phenanthroline (Bphen:LiF)/Al/molybdenum trioxide (MoO3) as an effective intermediate charge generation layer (CGL), which makes up for the deficiency of the color coordinates, yields relatively broadband white emission. Although single WOLEDs using 2,9-dimethyl-4,7-diphenyl-1,10-phenanthrolin (BCP) as hole blocking layer produced white light emission with Commission Internationale d'Eclairage (CIE) coordinates of (0.28, 0.39) at 10 mA/cm2, the optimized tandem WOLEDs demonstrated that the color coordinates were improved to (0.41, 0.42). The maximum efficiency was enhanced from 2.73 cd/A to 18.6 cd/A as well. © 2013 Elsevier B.V. All rights reserved.

Hou X.,Taishan University | Wang L.,Taishan University
Materials Letters | Year: 2014

Core/shell ZnO/CdS nanohybrids were fabricated via a simple sonochemical route using monodispersed ZnO nanorods as a starting reactant. The powder X-ray diffraction analysis of the ZnO/CdS hybrids showed additional diffraction peaks corresponding to the hexagonally structured CdS, apart from the signals from the wurtzite ZnO nanorods. The transmission electron microscopy image of the nanohybrids revealed that the ZnO nanorods were coated with hollow CdS nanospheres with typical diameters of approximately 20-30 nm. Compared with the uncoated ZnO nanorods, the charge transfer property of the ZnO/CdS nanohybrids was enhanced due to the sulfur doping and the additional electron injection from CdS shell into ZnO core. © 2014 Elsevier B.V.

Ma S.,Taishan University
International Journal of Modern Physics B | Year: 2015

The theoretical calculations indicate that the metal-doped boron nitride (BN) sheets are potential materials to store the hydrogen and tune the bandgap. It is all known that the BN sheet is a nonmagnetic wide-bandgap semiconductor. Using density function theory (DFT), the lattice parameters of Cr-doped BN sheets are optimized, which are still kept on two-dimensional (2D) planar geometry, and the bandgap and H2 storage are studied. The simulation results show that the H2 molecule can be easily absorbed by Cr-doped N in BN sheet. As the adsorption energy was greatly decreasing with the increasing number of Cr-doped N, B had an affinity for adsorption of H2. With the increase of Cr doping, the bandgap of Cr-doped BN sheet is decreasing. The bandgap decreases from 4.705 eV to 0.08 eV. So Cr-doped BN sheet is a promising material in storing H2 and tuning the bandgap. © 2015 World Scientific Publishing Company.

Chang P.-Y.,Taishan University
Advanced Materials Research | Year: 2012

In wafer plants, product will be manufactured through same process with different setups and specifications. This special manufacturing process is described as re-entrant flows. In photo process of wafer manufacturing, products is also restricted to be processed through same machine in each reentrance to improve quality. This phenomenon will cause scheduling in photo process being complicated and is proved to be a NP-hard problem. This research develops a mathematical model for photo process to minimize the makespan. A feasible solution is achieved using DBR (drum-buffer-rope) method. The results are compared to the optimal solution that is achieved using branch and bound algorithm. Our results show that DBR based method achieves a near optimal solution in shorter time. The results also indicate that DBR method can be useful in production scheduling with resource constraints. © (2012) Trans Tech Publications.

We reported a simple and convenient approach for the synthesis of high-yield ZnO/Ag nanocomposites by applying one-pot nonaqueous route. The products were characterized by X-ray diffraction, transmission electron microscopy, UV-vis spectroscopy and photoluminescence spectroscopy. The results showed that the products consisted of metallic Ag and ZnO components; Ag nanoparticles were attached to the ZnO nanorod cores; ZnO/Ag hybrid nanoarchitectures displayed tunable optical properties. Moreover, these ZnO/Ag heterostructured nanoassemblies possessed enhanced visible-light photocatalytic activity based on the unique ZnO-Ag interphase boundaries and synergetic effect between neighboring Ag nanoparticles and ZnO nanorods. © 2014 Elsevier B.V.

Cobblestone-like ZnO/Au nanocomposites have been synthesized via a simple and practical nonaqueous synthetic strategy at room temperature. The structure, composition, morphology, and optical properties were characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy, electron microscopy, and spectroscopic techniques. The results showed that the products were composed of metallic Au and ZnO components; spherical Au nanoparticles were attached to the ZnO supports; ZnO/Au hybrid nanostructures exhibited tunable optical properties. Moreover, these ZnO/Au nanohybrids were found to possess more efficient photocatalytic activity toward photodegradation of RhB than that of pure ZnO structure, which holds promise for applications in environmental remediation and water treatment. © 2014 Elsevier B.V. All rights reserved.

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