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Study on Anharmonic Effect of the Unimolecular Reaction of CH2(D2)FO
Jingjun Zhong,Qian Li,Ji Luo,Wenwen Xia,Li Yao,S. H. Lin 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.12
Study on the unimolecular reaction for CH2FO and CD2FO is carried out. The structures, energy barriers and zero point energy of the three channels in the title unimolecular reactions are computed with the MP2/6- 311++G(3df, 3pd) method. RRKM theory is used to calculate the rate constants of canonical case at temperature range of 500–5000 K and microcanonical system at total energy of 19.05–71.68 kcal/mol. The results indicate that the anharmonic effect and isotope effect are very small for the three channels, and the anharmonic rate constants, around 109–1011 s−1, are close to the experimental prediction reasonably.
Wang, X L,Dou, S X,Ren, Zhi-An,Yi, Wei,Li, Zheng-Cai,Zhao, Zhong-Xian,Lee, Sung-IK IOP Pub 2009 Journal of physics, an Institute of Physics journa Vol.21 No.20
<P>We measured the initial <I>M</I>–<I>H</I> curves for a sample of the newly discovered superconductor NdFeAsO<SUB>0.82</SUB>Fe<SUB>0.18</SUB>, which had a critical temperature, <I>T</I><SUB>c</SUB>, of 51 K and was fabricated at the high pressure of 6 GPa. The lower critical field, <I>H</I><SUB>c1</SUB>, was extracted from the deviation point of the Meissner linearity in the <I>M</I>–<I>H</I> curves, which show linear temperature dependence in the low temperature region down to 5 K. The <I>H</I><SUB>c1</SUB>(<I>T</I>) indicates no s-wave superconductivity, but rather an unconventional superconductivity with a nodal gap structure. Furthermore, the linearity of <I>H</I><SUB>c1</SUB> at low temperature does not hold at high temperature, but shows other characteristics, indicating that this superconductor might have multi-gap features. Based on the low temperature nodal gap structure, we estimate that the maximum gap magnitude Δ<SUB>0</SUB> = (1.6 ± 0.2) <I>k</I><SUB>B</SUB><I>T</I><SUB>c</SUB>.</P>
Wafer-scale synthesis of monolayer two-dimensional porphyrin polymers for hybrid superlattices
Zhong, Yu,Cheng, Baorui,Park, Chibeom,Ray, Ariana,Brown, Sarah,Mujid, Fauzia,Lee, Jae-Ung,Zhou, Hua,Suh, Joonki,Lee, Kan-Heng,Mannix, Andrew J.,Kang, Kibum,Sibener, S. J.,Muller, David A.,Park, Jiwoon American Association for the Advancement of Scienc 2019 Science Vol.366 No.6471
<P><B>Single-layer porphyrin polymerization</B></P><P>Two-dimensional polymers can be made as monolayer sheets through controlled synthesis at an interface. However, it is often difficult to create intact sheets over large areas that can be transferred onto substrates. Zhong <I>et al.</I> polymerized derivatized porphyrin molecules during laminar flow at a sharp pentane-water interface to form sheets that are 5 centimeters in diameter (see the Perspective by MacLean and Rosei). The authors used electron microscopy and spectroscopy to confirm that they had produced intact monolayers. These films were then transferred onto monolayer sheets of molybdenum disulfide to form superlattices for use as capacitors.</P><P><I>Science</I>, this issue p. 1379; see also p. 1308</P><P>The large-scale synthesis of high-quality thin films with extensive tunability derived from molecular building blocks will advance the development of artificial solids with designed functionalities. We report the synthesis of two-dimensional (2D) porphyrin polymer films with wafer-scale homogeneity in the ultimate limit of monolayer thickness by growing films at a sharp pentane/water interface, which allows the fabrication of their hybrid superlattices. Laminar assembly polymerization of porphyrin monomers could form monolayers of metal-organic frameworks with Cu<SUP>2+</SUP> linkers or covalent organic frameworks with terephthalaldehyde linkers. Both the lattice structures and optical properties of these 2D films were directly controlled by the molecular monomers and polymerization chemistries. The 2D polymers were used to fabricate arrays of hybrid superlattices with molybdenum disulfide that could be used in electrical capacitors.</P>
Coordination polymer nanospheres: Preparation, upconversion properties and cytotoxicity study
Zhong, S.,Ji, Y.,Xie, Q.,Wang, L.,Li, Y.,Jeong, J.H. North-Holland 2013 Materials Letters Vol. No.
Coordination polymer (CP) nanospheres with diameters of 100-200nm have been successfully synthesized via a simple solvothermal approach employing glycol both as solvent and ligand in the presence of asparagine. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductive coupled plasma (ICP), thermogravimetric (TG) and differential thermal (DTA) analysis were used to characterize the products. Upconversion emission centering at about 676nm is realized in the coordination polymer spheres when excited with 980nm laser. Cytotoxicity study reveals that the coordination polymer nanospheres are biocompatible.
Study on Anharmonic Effect of the Unimolecular Reaction of CH<sub>2</sub>(D<sub>2</sub>)FO
Zhong, Jingjun,Li, Qian,Luo, Ji,Xia, Wenwen,Yao, Li,Lin, S.H. Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.12
Study on the unimolecular reaction for $CH_2FO$ and $CD_2FO$ is carried out. The structures, energy barriers and zero point energy of the three channels in the title unimolecular reactions are computed with the MP2/6-311++G(3df, 3pd) method. RRKM theory is used to calculate the rate constants of canonical case at temperature range of 500-5000 K and microcanonical system at total energy of 19.05-71.68 kcal/mol. The results indicate that the anharmonic effect and isotope effect are very small for the three channels, and the anharmonic rate constants, around $10^9-10^{11}s^{-1}$, are close to the experimental prediction reasonably.
Spectral tomographic analysis of Bremsstrahlung X-rays generated in a laser-produced plasma
Rhee, Y.J.,Nam, S.M.,Peebles, J.,Sawada, H.,Wei, M.,Vaisseau, X.,Sasaki, T.,Giuffrida, L.,Hulin, S.,Vauzour, B.,Santos, J.J.,Batani, D.,McLean, H.S.,Patel, P.K.,Li, Y.T.,Yuan, D.W.,Zhang, K.,Zhong, J. Cambridge University Press 2016 Laser and particle beams Vol.34 No.4
<B>Abstract</B><P>A new approach is proposed to analyze Bremsstrahlung X-rays that are emitted from laser-produced plasmas (LPP) and are measured by a stack type spectrometer. This new method is based on a spectral tomographic reconstruction concept with the variational principle for optimization, without referring to the electron energy distribution of a plasma. This approach is applied to the analysis of some experimental data obtained at a few major laser facilities to demonstrate the applicability of the method. Slope temperatures of X-rays from LPP are determined with a two-temperature model, showing different spectral characteristics of X-rays depending on laser properties used in the experiments.</P>
Lim, H. T.,Zhong, T.,Cho, I. C.,Seo, B. Y.,Kim, J. H.,Lee, S. S.,Ko, M. S.,Park, H. B.,Kim, B. W.,Lee, J. H.,Jeon, J. T. Blackwell Publishing Ltd 2011 Animal genetics Vol.42 No.4
<P><B>Summary</B></P><P>The <I>KIT</I> locus has been suggested to be a strong candidate region linked with whole‐body roan in the F<SUB>2</SUB> population produced by intercrosses between Landrace and Korean Native pigs. In this manuscript, we report the finding of a novel alternative splicing event in the porcine <I>KIT</I> gene that results in the skipping of exon 5 in the <I>I</I><SUP><I>Rn</I></SUP> allele. <I>KIT</I> mRNAs that lack exon 5 were identified in the large intestine and skin, suggesting that the mechanism responsible for the skipping of exon 5 may be tissue specific. A U<SUB>26</SUB> repeat in intron 5 showed complete linkage (LOD = 11.8) with the roan phenotype and absolute association with the black phenotype of the Korean Native pig (KNP) population samples, inferring that the repeat pattern may alter the complementary base‐pairing‐mediated looping‐out of introns 4 and 5, which may mediate the exon 5‐skipping event. Although the sample size in our study was relatively small, we speculate that the <I>R3</I> allele containing the U<SUB>26</SUB> repeat is a causative element for the roan phenotype via alternative control of the exon skipping in our roan pedigree.</P>
CO₂ Reforming of Methane over Ni on MgO-Precoated Al₂O₃
Zhong-Wen Liu,Hyun-Seong Roh,전기원,H. S. Potdar,Min Ji 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5
The effects of MgO loading and calcination temperature of the catalysts on the carbon dioxide reforming of methane (CDR) have been extensively investigated over Ni/MgO/Al2O3 catalysts in a fixed-bed reactor system. Results indicate that the activity and stability of the catalysts were significantly influenced by both MgO loading and calcination temperature, i.e., higher calcination temperature and higher MgO loading are essential for high activity and stability of the catalyst. Characterization results indicate that mixed spinel phase composed of MgAl2O4 and NiAl2O4 is effective to produce active and stable Ni species having strong Ni to support interaction resulting in active and stable catalytic performance in CDR.