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Mori, Hirotaka,Suzuki, Masaaki,Kim, Woojae,Lim, Jong Min,Kim, Dongho,Osuka, Atsuhiro Royal Society of Chemistry 2015 Chemical science Vol.6 No.3
<▼1><P>A series of [26]hexaphyrins(1.1.1.1.1.1) bearing two α-oligothienyl substituents at 5,20-positions have been synthesised and are shown to have a dumbbell hexaphyrin conformation, to which the α-oligothienyl groups are linked to form an acyclic helix-like conjugated network.</P></▼1><▼2><P>A series of [26]hexaphyrins(1.1.1.1.1.1) bearing two α-oligothienyl substituents at 5,20-positions have been synthesised and are shown to have a dumbbell hexaphyrin conformation, to which the α-oligothienyl groups are linked with small dihedral angles to form an acyclic helix-like conjugated network. While their distinct diatropic ring currents and four reversible reduction waves characteristic of aromatic [26]hexaphyrins indicate that the [26]hexaphyrin aromatic circuits are viable, the absorption spectra and excited state dynamics are significantly perturbed, which becomes increasingly evident with elongation of the oligothienyl substituents. DFT calculations of these hexaphyrins indicated that the LUMO and LUMO + 1 are localised on the hexaphyrin circuit and the HOMO and HOMO – 1 are spread over the acyclic helix-like conjugation network, which can explain the perturbed absorption spectra.</P></▼2>
Visible-light photocatalytic activity of TiO2-x by heat treatment and plasma-heat treatment
YoonKeun Chae,박진원,Shinsuke Mori,Masaaki Suzuki 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
The partial reduction of TiO2 was attempted by heat treatment and plasma-heat treatment and it was carried out to investigate the photocatalytic characteristics of partially reduced TiO2 (TiO2x) in the visible-light region. As a result, the plasma-heat treatment shows significantly stronger than the heat treatment for the visible-light photocatalytic activity of TiO2. The red-shifted absorption bands in the visible-light region of TiO2-x by plasma-heat treatment gave broader than one by heat treatment. The TiO2-x by heat treatment and plasma-heat treatment was changed white to beige color, and white to navy, respectively.
Photocatalytic effects of plasma-heated TiO2−x particles under visible light irradiation
YoonKeun Chae,박진원,Shinsuke Mori,Masaaki Suzuki 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
The photocatalytic characteristics of partially reduced TiO2 (TiO2−x) by plasma treatment and plasma-heated treatment were investigated in the visible-light region. For the visible-light photocatalytic activity of TiO2−x, plasmaheated treatment shows stronger than plasma treatment significantly. The TiO2−x by plasma-heated treatment shows broader red-shifted absorption bands than one by plasma treatment in the visible-light region. The surface color of TiO2−x by plasma treatment and plasma-heated treatment changed from white to sky blue, and to navy, respectively. After exposure to air, the surface color of TiO2−x changed from sky blue to white for plasma treatment and from navy to beige for plasma-heated treatment.
Correlation between Ti2O3 and oxygen absorption property of partially reduced TiO2 (TiO2-x)
YoonKeun Chae,JinWon Park,Shinsuke Mori,Masaaki Suzuki 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
The partial reduction of TiO2 was investigated by hydrogen plasma treatment and it was performed to examine the oxygen absorption property of partially reduced TiO2 (TiO2-x). In this experiment, TiO2-x was analyzed by X-ray diffraction (XRD) and oxygen absorption of partially reduced TiO2 was measured by gas chromatography (GC). Consequently, it was shown that hydrogen plasma treatment can partially reduce TiO2 by plasma effects and TiO2-x can adsorb oxygen. The H2O formation and the oxygen absorption were found to be dependent on the heating temperature. The oxygen absorption property was attributed to the formation of Ti2O3.
AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHT WATER REACTOR ANALYSES
Yamamoto, Akio,Endo, Tomohiro,Tabuchi, Masato,Sugimura, Naoki,Ushio, Tadashi,Mori, Masaaki,Tatsumi, Masahiro,Ohoka, Yasunori Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculation models and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objective of the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysis code, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validation efforts related to the AEGIS code.
AEGIS: AN ADVANCED LATTICE PHYSICS CODE FOR LIGHTWATER REACTOR ANALYSES
AKIO YAMAMOTO,TOMOHIRO ENDO,MASATO TABUCHI,NAOKI SUGIMURA,TADASHI USHIO,MASAAKI MORI,MASAHIRO TATSUMI,YASUNORI OHOKA 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.5
AEGIS is a lattice physics code incorporating the latest advances in lattice physics computation, innovative calculationmodels and efficient numerical algorithms and is mainly used for light water reactor analyses. Though the primary objectiveof the AEGIS code is the preparation of a cross section set for SCOPE2 that is a three-dimensional pin-by-pin core analysiscode, the AEGIS code can handle not only a fuel assembly but also multi-assemblies and a whole core geometry in two-dimensional geometry. The present paper summarizes the major calculation models and part of the verification/validationefforts related to the AEGIS code.