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Yoshihiro Sugi,Yukio Hasegawa,Hiroshi Tamada,Kenichi Komura,Yoshihiro Kubota,김종호 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
Isopropylation of naphthalene (NP) was examined over H-mordenite (MOR), H-Y zeolite (FAU), and HBeta zeolite (BEA) in order to elucidate roles of isopropylnaphthalene (IPN) isomers during the catalysis. 2-IPN was the predominant isomer over MOR and works as a precursor for the selective formation of β,β-DIPN, particularly, 2,6-DIPN. In contrast, 1-IPN was predominant (with 2-IPN as a minor isomer) over FAU and BEA at low temperatures;dialkylation accompanied by the consumption of 1- and 2-IPN led to predominant formation of α,α- and α,β-DIPN. The formation of β,β-DIPN from 2-IPN was enhanced at higher temperatures. Bulky transition states of 1-IPN in IPN isomers and α,α- and α,β-DIPN among DIPN isomers were hindered by the interaction with MOR channels, resulting in the selective formation of β,β-DIPN, particularly 2,6-DIPN through the less bulky 2-IPN. FAU and BEA allow the formation of α,α- and α,β-DIPN from both of 1- and 2-IPN isomers because their channels are too large to exclude bulky transition states. The catalysis over FAU and BEA occurred under kinetic control at lower temperatures, and thermodynamic control also participates at higher temperatures.
Takahisa Shiraishi,Hiro Einishi,Shintaro Yasui,Hiroshi Funakubo,Tomohito Hasegawa,Minoru Kurosawa,Mutsuo Ishikawa,Hiroshi Uchida,Yukio Sakashita,김상수,송태권,도달현,김명호 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
(K0.88Na0.12)NbO3 (KNN) thick films with various thicknesses were prepared on Ni-based metal substrates by hydrothermal method. Although the deposition of KNN films was hardly observed directly on metal substrates until 12 h, the amount of KNN films deposited on both SrRuO3/LaNiO3- and SrRuO3-covered Ni based metal substrates increased to about 5 μm with increasing deposition time above 3 h. X-ray diffraction studies confirmed the formation of {100}c- and randomly-oriented KNN films on SrRuO3/LaNiO3- and SrRuO3-covered metal substrates, respectively. Ferroelecctric property studies revealed an improved remanent polarization and an improved piezoelectric response of {100}c-oriented KNN films over the randomly-oriented KNN films. In addition, the values for {100}c-oriented KNN films were similar to those of {100}c-oriented epitaxial KNN films prepared on (100)cSrRuO3//SrTiO3 substrates.