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Li Z.,Chongqing University of Arts and Sciences | Li Z.,Chongqing Key Laboratory of Micro Nano Materials Engineering and Technology | Zhao H.,Chongqing University of Arts and Sciences
EPL | Year: 2015

We investigate the spatial Bloch-like oscillations in planar double-period silver waveguide arrays. Three types of oscillation modes are obtained in the sixth-generation double-period structure at different incident position, namely positive oscillation mode, negative oscillation mode and breathing-wave-like oscillation mode. The period of the three types of oscillation modes increases when the incident wavelength is redshifted, while the period of the up-oscillation and down-oscillation of the breathing-wave-like oscillation mode decreases and increases, respectively, in the gradient sixth-generation double-period system. © EPLA, 2015.

Yin Q.,East China Institute of Technology | Yin Q.,Chongqing Key Laboratory of Micro Nano Materials Engineering and Technology | Chen Q.,East China Institute of Technology | Liu Y.,East China Institute of Technology | And 3 more authors.
International Journal of Electrochemical Science | Year: 2011

In this work, a novel and sensitive spectrometric method for determination of copper was developed with carbon nanotubes (CNTs) as a toner. The optimum operating conditions regarding kind of CNTs, concentration of reagents and pH were established. The enhancing mechanism of CNTs was also investigated. Comparative experiments prove that the application of carboxyl CNTs has the optimum hyperchromic effect: the absorbance of the complex was increased by nearly 100% through optimizing the technological parameters. The coloration system showed maximum absorbance at 578nm with a molar absorptivity value of 2.75×105 l mol-1 cm-1; the calibration graph was linear over the range 0.1-11.0μg/25.0ml and the limit of detection was 158ng/25ml. The enhancing mechanism of CNTs is that the copper-PF complex can be closely absorbed onto the sidewall of CNTs to form a novel and structural stable complex, which can reduce the adverse effects caused by the hydrolysis reaction of copper, and improve the sensitivity of the coloration system. © 2011 by ESG.

Zhao X.Y.,Chongqing University of Arts and Sciences | Lei X.W.,Chongqing University of Arts and Sciences | Lei X.W.,Chongqing Key Laboratory of Micro Nano Materials Engineering and Technology
Indian Journal of Physics | Year: 2012

Critical behavior of the two-dimensional fully frustrated XY model has been investigated with Monte Carlo methods. Based on the dynamic scaling ansatz of the magnetization for temperatures above the transition temperature, the correlating time, spatial correlation length has been extracted. Fitting the correlation length to the exponential singularity assumed for the Kosterlitz-Thouless (KT) transition, the transition temperature T KT and the static exponent m have been determined. The T KT = 0.45065(3) is one percent or two higher than that estimated from simulations in equilibrium. Moreover, the exponent m = 0.089(2) is smaller than the theoretical value 0.5. © 2012 IACS.

Fu Z.,Chongqing Key Laboratory of Micro Nano Materials Engineering and Technology | Fu Z.,Chongqing University of Arts and Sciences | Jia L.,Chongqing University of Arts and Sciences | Sun X.,Lanzhou Jiaotong University | Chen Q.,CAEP - China Academy of Engineering Physics
High Energy Density Physics | Year: 2013

The electrical conductivity of warm dense tungsten plasma has been investigated successfully by a linear mixture rule considering various interactions of electrons with electrons, atoms, and ions. The plasma composition is calculated by the nonideal Saha equation. The interesting regime for tungsten plasma spans from weakly coupled and nondegenerate regime to strongly coupled and partial degenerate state. The electrical conductivity calculated is in reasonable agreement with the exploding wire experiments and other theoretical models. The present result demonstrates that the theoretical model is valid for the electrical conductivity of tungsten plasma in the warm dense matter regime. © 2013 Elsevier B.V.

Han Z.-X.,Huaihai Institute of Technology | Han Z.-X.,Chongqing Key Laboratory of Micro Nano Materials Engineering and Technology | Han Z.-X.,Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection | Zhu Z.,Huaihai Institute of Technology | And 3 more authors.
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2014

Natural sepiolite was used as an adsorbent for the investigation of the adsorption kinetics, isotherms, thermodynamic parameters of an acid blue 25 (AB25), methylene blue (MB) from aqueous solution at various pHs, temperatures, the kinetics, and thermodynamics for the removal of the two dyes onto natural sepiolite have also been investigated. The adsorbed amounts of AB25 increased with decreasing pH and the optimum pH value for the AB25 and MB were found to be 3.0 and 9.0. respectively. The adsorption capacity of AB25 onto natural sepiolite increased with the increasing temperature, indicating that AB25 and MB dye adsorption on the natural sepiolite was an endothermic process, the second-order model is found to be more suitable to describe the adsorption kinetic data than the first-order model for natural sepiolite on the AB25 and MB and the adsorption process of AB25 and MB are showing pseudo-second-order kinetic behavior, respectively. The adsorption of AB25 and MB on natural sepiolite may be followed by an intraparticle diffusion up to 60 and 90 min, respectively, and the Langmuir equation represents the adsorption process better. The fit of the data for AB25 and MB adsorption onto natural sepiolite suggests that the D-R model gave slightly closer fittings than those of Langmuir and Freundlich models. The adsorption of AB25 on natural sepiolite has a low potential barrier, which is also indicates a physical adsorption. The negative values of G0 and positive H0 which has been obtained indicates that the MB adsorption process is a spontaneous and endothermic. Copyright © Taylor &Francis Group, LLC.

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