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Effects of ratio of mixed gases on the surface roughness and nano-hardness of a-C:H films
Haiyang Dai,Hui Jiang,Changyong Zhan,Ningkang Huang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.-
Methane-argon mixed gases were used for assistance in growing hydrogenated amorphous-carbon a-C:H) films. a-C:H films on p-type (100) silicon wafers were produced by middle frequency unbalanced magnetron sputtering technique at different ratios of the methane-argon gases. These films were characterized by atomic-force microscopy, nanoindentation, and Raman spectroscopy. The experimental results reveal that the nano-hardness and surface roughness of the films increase with increasing Ar concentration from 17% to 50%, while they decreased when the Ar concentration was above 50\%. The sp³/sp² ratio increases with increasing Ar concentration from 17% to 50%, but it decreased when the Ar concentration exceeded 50%, based on the results of the measurements of Raman spectroscopy. Methane-argon mixed gases were used for assistance in growing hydrogenated amorphous-carbon a-C:H) films. a-C:H films on p-type (100) silicon wafers were produced by middle frequency unbalanced magnetron sputtering technique at different ratios of the methane-argon gases. These films were characterized by atomic-force microscopy, nanoindentation, and Raman spectroscopy. The experimental results reveal that the nano-hardness and surface roughness of the films increase with increasing Ar concentration from 17% to 50%, while they decreased when the Ar concentration was above 50\%. The sp³/sp² ratio increases with increasing Ar concentration from 17% to 50%, but it decreased when the Ar concentration exceeded 50%, based on the results of the measurements of Raman spectroscopy.
Activated carbon supported VN, Mo2N, and W2N as catalysts for acetylene hydrochlorination
Hui Dai,Mingyuan Zhu,Haiyang Zhang,Feng Yu,Chao Wang,Bin Dai 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-
The development of green catalysts for the calcium carbide acetylene method synthesis of vinyl chloridemonomer (VCM), is essential material to industrial polyvinyl chloride production. The original catalystHgCl2 easy to volatile during the reaction lead to environmental pollution. Here we present threedifferent transition metal nitride load into activated carbon (AC): VN/AC, Mo2N/AC, and W2N/AC as novelcatalysts. W2N/AC and Mo2N/AC was a relatively stable catalyst to compared with VN/AC. All of themVCM selectivity can maintain 98%. More HCl ratio for Mo2N/AC lead its acetylene conversion reach 80%. The former two catalysts are promising candidates for acetylene hydrochlorination.
The PP6 Phosphatase Regulates ABI5 Phosphorylation and Abscisic Acid Signaling in <i>Arabidopsis</i>
Dai, Mingqiu,Xue, Qin,Mccray, Tyra,Margavage, Kathryn,Chen, Fang,Lee, Jae-Hoon,Nezames, Cynthia D.,Guo, Liquan,Terzaghi, William,Wan, Jianmin,Deng, Xing Wang,Wang, Haiyang American Society of Plant Biologists 2013 The Plant cell Vol.25 No.2
<P>This study shows that two catalytic subunits of <I>Arabidopsis</I> protein phosphatase 6 (i.e., FyPP1 and FyPP3) negatively regulate abscisic acid responses through direct interaction with and dephosphorylation of ABI5, which subsequently regulates ABI5 stability and activity, seed germination, and postgermination seedling growth in <I>Arabidopsis</I>.</P>
Hydrochlorination of acetylene to vinyl chloride monomer over bimetallic Au–La/SAC catalysts
Haiyang Zhang,Xugen Wang,Longlong Xu,Mingyuan Zhu,Bin Dai 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Gold and gold-based bimetallic catalysts for acetylene hydrochlorination were prepared with HAuCl44H2O and LaCl37H2O as precursors and analyzed by the characterization methods of BET,XRD, SEM, TG and ICP-AES. The results indicate that pitch-based spherical activated carbon SAC is the optimal carrier; Au/C catalyst deactivates easily for coke deposition and the valence change of Au in the reaction, the addition of lanthanum to gold can weaken the occurrence of coke deposition and inhibit the valence change of gold to improve the stability of the catalyst; Under the reaction conditions of temperature 423 K, C2H2 hourly space velocity (GHSV) 360 h1, feed volume ratio V (HCl)/V (C2H2) = 1.15and Au loading of 1 wt%, the optimal atomic ratio of Au, La (a/a) was 1:3, the conversion of acetylene was up to 98% and the selectivity to VCM was more than 99.8%.
Ningkang Huang,Yu Zou,Ding Ren,Changyong Zhan,Haiyang Dai 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4
Diamond-like carbon (DLC) films were prepared by using the middle frequency pulsed unbalanced magnetron sputtering technique (MFPUMST) at different Ar pressures. The structural and the mechanical properties of the films were characterized using Raman spectra and nano-indentation tests. The Raman spectra showed that the sp3 fraction in the DLC films decreases with increasing gas pressure from 0.27 to 1.60 Pa. The mechanical properties, like the nano-hardness and the elastic recovery, for these films under different gas pressures showed the same tendency in that the nano-hardness and the elastic recovery decreased with increasing gas pressure from 0.27 to 1.60Pa. The variations in the nano-hardness and the elastic recovery could be interpreted by using the different sp3 fraction in the prepared DLC films. Also, the gas pressure had a strong influence on the bonding properties of the deposited DLC films. The mechanism for the effect of gas pressure on the sp3 fraction is discussed in this paper.