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Liu B.-T.,Dalian Polytechnic University | Liu B.-T.,Liaoning Research Institute of Light Industry | Luo B.,Liaoning Research Institute of Light Industry | Xu Z.-Z.,Liaoning Research Institute of Light Industry | Liu G.-S.,Dalian Polytechnic University
Gongneng Cailiao/Journal of Functional Materials | Year: 2011

The porous alumina ceramics was prepared by freezing the slurry system, which was constituted of camphene, alumina powder and Texaphor 963, then induced by temperature gradient, followed by drying and firing. The resultant porous ceramics had unique directional pore channels structure, high porosity and high compressive strength. The scanning electron microscope was used to observe its internal structure. The porosity, compressive strength and shrinkage of the porous ceramics were tested respectively. The results show that the solid loading of the slurry and sintering temperature have remarkable effects on porosity, compressive strength and shrinkage of porous alumina ceramics, freezing temperature and sintering temperature have greater influence on pore size distribution and fracture microstructure of porous alumina ceramics. The porous ceramics with directional pore channels structure can be prepared by a camphene-based freeze-casting technique, by adjusting process parameters to control the pore structure and properties of porous ceramics, in order to meet different needs of the user.

Liu X.,Dalian Polytechnic University | Shen Q.,Dalian Polytechnic University | Lin H.,Dalian Polytechnic University | Yang D.,Liaoning Research Institute of Light Industry
Advanced Materials Research | Year: 2011

In Er3+/Yb3+ codoped Na2O-ZnO-PbO-GeO 2-TeO2 (NZPGT) glasses, effective ∼1.5μm infrared (IR) emission was investigated under 980nm excitation. Judd-Ofelt intensity parameters ωt (t = 2, 4, 6) had been calculated to be 6.78×10-20, 1.54×10-20, and 1.17×10 -20cm2, respectively. The IR emission full width at half maximum (FWHM) is 73nm, and the maximum stimulated emission cross-section (σe) is derived to be 7.53×10-21cm2. A figure of merit (FOM) as the product FWHM× σe is adopted to evaluate the gain bandwidth. The comparison of FOM in different glasses indicated that Er3+/Yb3+ codoped NZPGT glasses were potential materials in developing broadband optical amplifier. © (2011) Trans Tech Publications, Switzerland.

Sun L.,China Academy of Engineering Physics | Sun L.,Liaoning Research Institute of Light Industry | Luo X.,China Academy of Engineering Physics | Chen S.,China Academy of Engineering Physics | And 5 more authors.
Journal of Macromolecular Science, Part B: Physics | Year: 2015

The optical properties of several carbazole-based photorefractive polymers which we prepared were determined. Through analysis of the UV-vis spectrum, the ratio of the azo nitrobenzene was adjusted to control the content of azo chromophore functional components. The solid transient fluorescence emission spectra of the photorefractive polymers were tested with a 325 nm emission wavelength. The results showed that the J-aggregates and several large closed-loop structures formed in the photorefractive polymers resulted in a long lifetime of their transient fluorescence. Spin-orbit coupling among the molecules increased the intersystem crossing rate, and induced delayed fluorescence. Copyright © Taylor & Francis Group, LLC 2015.

Ding L.,Ningxia University | Li L.,Liaoning Research Institute of Light Industry | You W.,Ningxia University | Gao Z.-N.,Ningxia University | Yang T.-L.,Ningxia University
Croatica Chemica Acta | Year: 2015

The electrocatalytic oxidation of venlafaxine (VEN) was investigated at a glassy carbon electrode (GCE), the modified electrode by a gel containing multiwall carbon nanotubes (MWCNTs) and a room-temperature ionic liquid (RTIL), 1-butyl-3-methylimidazolium hexafluorophate (BMIMPF6) in 0.10 mol L-1 phosphate buffer solution (PBS, pH 6.8). It was found that an irreversible anodic oxidation peak of VEN with the peak potential (Epa) as 0.780 V appeared at MWCNTs-RTIL/GCE. The electrode reaction process was a diffusion-controlled one and the electrochemical oxidation involved two electrons transferring and two protons participation. Furthermore, the charge-transfer coefficient (α), and the electrode reaction rate constant (kf) of VEN were found to be 0.91 and 3.04×10-2 s-1, respectively. Under the optimized conditions, the electrocatalytic oxidation peak currents were linearly dependent on the concentration of VEN in the concentration range from 2.0×10-6 mol L-1-2.0×10-3 mol L-1 with the limit of detection (S/N = 3) as 1.69×10-6 mol L-1. The proposed method has been successfully applied in the electrochemical quantitative determination of VEN content in commercial venlafaxine hydrochloride capsules and the determination results could meet the requirement of the quantitative determination. © 2015, Croatian Chemical Society. All rights reserved.

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