Papers by Author: Shou Gang Chen

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Authors: Yan Chen, Hai Ying Zhu, Yan Hua Lei, Wei Wei Sun, Yun Ping Liu, Shou Gang Chen
Abstract: A 3, 4-dihydroxyphenethylamine (dopamine) polymer film has been prepared on copper surface from 2.0g/L dopamine solution in tris(hydroxymethyl)aminomethane hydrochloride (Tris-HCl) buffer solution at pH 8.5 by a simple solution-immersion method. The dopamine self-polymerized and adhered to the copper surface firmly in aqueous environment. The film surface was evaluated through SEM, EDS, XPS and contact angle measurement. The results have shown that the film was indeed formed on copper surface. And this research offers a versatile approach for the surface modification.
Authors: Hai Ying Zhu, Yan Chen, Yun Ping Liu, Wei Wei Sun, Shou Gang Chen
Abstract: The present work aims at studying the corrosion resistance of carbon steel substrates pre-treated with bis-[triethoxysilylpropyl] tetrasulfide (BTESPT) solutions. The corrosion behavior of the pre-treated substrates during immersion in seawater was assessed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The analytical characterization of the silane films was performed by scanning electron microscopy (SEM). The results show that the pre-treatments based on silanes provide good corrosion protection of carbon steel substrates and the bis-silane film has good adhesion properties.
Authors: Mei Yan Yu, Wan Xia Wang, Shou Gang Chen
Abstract: The bond length, average binding energy, magnetic moment per atom and the ionic potential of Nin (2-13) clusters were calculated in detail. The variations of magnetic moment per atom and the ionic potential agree well with experimental data. Theoretical results show that BPW91/Lanl2dz method is the best method and basis set for nickel clusters research, respectively. The ground state configurations and electronic structure properties of Nin (2-13) clusters were investigated using the BPW91/LanL2DZ level of DFT method. Through the molecular orbital, we could explain the paramagnetic and diamagnetic to the influence of the magnetic moment after different nickel cluster molecular hybridization.
Authors: Shou Gang Chen, Wei Wei Sun, Shuai Qin Yu, Xun Jun Yin, Yan Sheng Yin
Abstract: Theoretical study on the electronic structure of small FemAln(m+n=6) clusters has been carried out at the BPW91 level, and the electronic structures, binding energy and vertical ionization potential of clusters were evaluated. For the stable clusters, the iron atoms gather together and form a maximum of Fe-Fe bonds, and the aluminum atoms locate around Fe core with a maximum of Fe-Al bonds. The binding energy and vertical ionization potential show that the Fe5Al, Fe4Al2 and Fe3Al3 clusters have higher stability, which results provide insight into the properties of iron-aluminides can be obtained from a finite size cluster model.
Authors: Rui Ting Xue, Shou Gang Chen, Guan Hui Gao, Yan Sheng Yin
Abstract: The complex {1,1’-[ o-phenylenebis (nitrilomethylidyne) ] di-2-naphtholato} copper(II) was optimized by the DFT method at B3LYP/LANL2DZ level, and the frontier molecular orbitals, natural bond orbitals, nonlinear optical properties and Mülliken charge population of the optimized complex were exploited and analyzed. The calculated results show that the complex has stable structure and it keeps some potential applications in optic materials field.
Authors: Fen Zhang, Shou Gang Chen, Le Jiao Yang, Yan Sheng Yin
Abstract: The TiO2 nanotubes with a highly ordered structure on titanium were grown by a self-organized electrochemical anodization with viscous organic electrolytes containing small additions of fluorides as the supporting electrolyte. The structure and composition of the as-anodized nanotubes were characterized by field emission scanning electron microscopy. The formation mechanism of the nanotubes was discussed.
Authors: Ya Wen Wang, Shou Gang Chen, Lan Li, Yan Sheng Yin
Abstract: The lithium absorption energies and electronic structures of boron- or silicon-doped single-walled carbon nanotubes (SWCNT) were investigated using first-principles calculations based on the density-functional theory. As B and Si doping carbon nanotubes, the lithium atom adsorption energies decrease. The effects of B and Si doping are different on the lithium atomic adsorption. B-doping forms an electron-deficient structure in SWCNT. While the Si-doping forms a highly reactive center. The calculations suggest that boron- and silicon-doping in SWCNT will improve Li absorption performance.
Authors: Fen Zhang, Shou Gang Chen, Yan Sheng Yin, Chao Rui Xue, Chan Lin
Abstract: A novel, low-temperature two-step synthesis method for producing BaTiO3 thin films patterned in the form of nanotubes on Ti substrates is reported. Firstly, the Ti substrate is anodized to produce a surface layer of amorphous TiO2 nanotube arrays. Secondly, the anodized substrate is subjected to hydrothermal treatment in aqueous Ba(OH)2, where the nanotube arrays serve as templates for their hydrothermal conversion to single-crystal BaTiO3 thin film. This opens the possibility of tailoring the nanotube arrays and their combinations in the hydrothermal bath, to produce ordered, patterned thin film structures of various Ti containing ceramics.
Authors: Sha Cheng, Shou Gang Chen, Xue Ting Chang, Tao Liu, Yan Sheng Yin
Abstract: The microbially influenced corrosion of copper by marine bacterium Vibrio natriegens (V. natriegens) was investigated using surface analysis (atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS). AFM images corroborated the results from the EIS models which show biofilm attachment over time. The electrochemical results showed that the corrosion of copper was accelerated in the presence of V. natriegens based on the decrease in the resistance of the charge transfer resistance (Rct) obtained from EIS.
Authors: Xue Ting Chang, Shou Gang Chen, Yan Sheng Yin
Abstract: Electrochemical impedance spectrum (EIS) and potentiodynamic polarization curve were applied to invest the corrosive behavior of Fe3Al/ZrO2 composites with different components in marine microbial medium. The results indicated that the existence of microbiology negatively moved the open circle potential. When the composites contained 30% (wt %) ZrO2, the passive film on electrodes surface was the thickest one, even after 25 days the material was still protected. When the content of ZrO2 was 90%, Fe3Al was in the least content, after 25 days the passive film has disappeared, but the material was still not eroded because of the high hardness and corrosion-resistant properties of ZrO2. When the content of ZrO2 was 80%, the passive film was partly damaged, which could lead to more serious local corrosion.
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