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최슬기,심일운 중앙대학교 기초과학연구소 2000 基礎科學硏究所 論文集 Vol.14 No.-
Iron complexes have been incorporated into cellulose acetate (CA) films as a dispersion medium using tetrahydrofubran(THF). The resulting light brown-colored homogeneous films of 10∼30 wt.% Fe metal complex concentration are found to be thermally stable up to 150℃ and the relatively electron rich oxygen atoms of acyl groups in cellulose acetate(CA) molecules are assumed to interact with Fe complexes on the basis of their infrared spectroscopic and thermal analysis. The reaction chemistry of Fe in CA has been investigated by reacting Fe sites with small gaseous molecules such as CO, H2, O2, NO and olefins in the temperature range of 25∼150℃. Various Fe-carbonyls, -hydride, -nitrosyl and -dioxygen species formed in CA films are characterized by infrared spectroscopy. The treatment of Fe-containing CA film with H2 gas at 120℃ produces small Fe metal particles of about 20∼120Å in diameter in CA, which showed various catalytic reactivity such as CO oxidation, NO reduction, and hydrogenation of olefins.
Spectral and Thermal Studies of Transition Metal PSSA Ionomers
Shim, Il-Wun,Risen, William M. Jr. Korean Chemical Society 1988 Bulletin of the Korean Chemical Society Vol.9 No.6
Transition metal PSSA ionomers containing Co(II), Ni(II), Cr(III), Ru(III), and Rh(III) are investigated by IR, Far-IR, UV-Vis and DSC. Reliable IR Spectroscopic criteria are established for assessing the degree of ion-exchange of PSSA ionomers and the local structures around metal cations in them. In the hydrated transition metal PSSA ionomers, the ionic groups are solvated by water molecules and there is no significant interactions between sulfonate group and metal cations. The visible spectra indicated that metal cations are present as [M$(H_2O)_6$]$^{n+}$ with Oh symmetry. Their $T_g$ values increase as the extent of ionic site concentration increases, but there is no direct dependence of $T_g$ on the nature of metal cations or their oxidation states. Thus, the water content in PSSA ionomer is found to have dominant influence on $T_g$ of hydrated transition metal PSSA ionomers. Dehydration of the hydrated transition metal PSSA ionomers results in direct interaction between ionic groups and significant color changes of the ionomers due to the changes of the local structures around metal cations. On the base of spectral data, their local structures are discussed. In case of dehydrated 12.8 and 15.8 mol % transition metal PSSA ionomers, no glass transition is observed in 25-$250^{\circ}C$ region and this is believed to arise from the formation of highly crosslinked structures caused by direct coordination of sulfonate groups of metal cations. In the 6.9 mol % transition metal PSSA ionomers, the glass transition is always observed whether they are hydrated or dehydrated and this is though to be caused by the sufficient segmental mobility of the polymer backbone.
The Chemistry of Rhodium in Polysulfone: Reactions with Various Small Gas Molecules
Il-Wun Shim,Jin-Si Kim,Seok-Jong Oh,Yong-Sik Yang,Hwan-Kyu Suh,Sang-Kyu Lee Korean Chemical Society 1994 Bulletin of the Korean Chemical Society Vol.15 No.2
RhCl [P($C_6H_5)_3]_3$ complexes have been incorporated in polysulfone (PS) as a dispersion medium using cosolvent (THF). The interactions between Rh(Ⅰ) complexes and polysulfone polymer molecules are examined by infrared spectroscopy and thermal analysis. The chemical reactivity of Rh in PS films has been investigated by reacting Rh sites with CO, $H_2,\;D_2,\;O_2\;NO,\;C_2H_2\;and\;C_2H_4$ in the temperature range $25-200^{\circ}C$. Various Rh-carbonyl, -hydride and -nitrosyl species formed in PS films are characterized by their infrared spectra. Rh complexes in PS film show interesting catalytic reactivities in the reactions such as hydrogenation of $C_2H_2\;and\;C_2H_4$, oxidation of CO, and reduction of NO by CO or $H_2$ gas under relatively mild conditions.
Shim, Il-Wun,Noh, Won-Tae,Kwon, Ji-Woon,Jo, Jung-Young,Kim, Kyung-Soo,Kang, Dong-Hee Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.4
Copper complexes have been directly incorporated into cellulose acetate (CA) and the resulting light blue colored homogeneous films of 5-20 wt.% copper acetate complex concentrations are found to be thermally stable up to 200 $^{\circ}C$. The reaction chem istry of Cu in CA has been investigated by reacting them with small gas molecules such as CO, H2, D2, O2, NO, and olefins in the temperature range of 25-160 $^{\circ}C$, and various Cu-hydride, -carbonyl, -nitrosyl, and olefin species coordinated to Cu sites in CA are characterized by IR and UV/Vis spectroscopic study. The reduction of Cu(II) complexes by reacting with H2 gas at the described conditions results in the formation of Cu2O and copper metal nanoparticles in CA, and their sizes in 30-120 nm range are found to be controlled by adjusting metal complex concentration in CA and/or the reduction reaction conditions. These small copper metal particles show various catalytic reactivity in hydrogenation of olefins and CH3CN; CO oxidation; and NO reduction reactions under relatively mild conditions.
프살로 시아닌 철을 포함하는 1차원 폴리 - 인 고분자 화합물의 합성 및 분광학적 연구
심일운 中央大學校 自然科學硏究所 1988 自然科學硏究所 論文集 Vol.2 No.-
Phthalocyanine Iron이 p-diethynyl benzo 그룹에 의한 다리결합을 통해 1차원적인 구조를 갖는 고분자 화합물이 dichlorophthalocyaninato Iron 및 p-diethynyl benzene의 Na 염과의 염 제거 반응에 의해 합성되었으며, 여러가지 분광학적 방법에 의해 분석 되었다. 이 무기고분자 화합물은 320℃까지 매우 안정 하였으며 전기적으로 부도체였다. 또한 이 고분자화합물과 Br₂를 에테르 용액에서 반응 시켰을 때 Doping, 또는 부가 반응은 일어나지 않았으며 PcFe 및 PcFeBr₂를 포함하는 호합물로 분해되었다.
Shim, Ui Jae,Lee, Il-Seok,Kang, Ho Won,Kim, Jayoung,Kim, Won Tae,Kim, Isaac Yi,Ryu, Keun Ho,Choi, Yung Hyun,Moon, Sung-Kwon,Kim, Yong-June,Yun, Seok-Joong,Lee, Sang-Cheol,Kim, Wun-Jae The Korean Urological Association 2013 Korean Journal of Urology Vol.54 No.9
<P><B>Purpose</B></P><P>The deleted in bladder cancer 1 (<I>DBC1</I>) gene is located within chromosome 9 (9q32-33), a chromosomal region that frequently shows loss of heterozygosity in bladder cancer (BC). It is suspected that it acts as a tumor suppressor gene, but its prognostic value remains unclear. The aim of the present study was to investigate the value of <I>DBC1</I> as a prognostic marker in BC.</P><P><B>Materials and Methods</B></P><P>The expression of <I>DBC1</I> was determined by real-time polymerase chain reaction analysis in 344 patients with BC (220 non-muscle-invasive BC [NMIBC] and 124 muscle-invasive BC [MIBC]) and in 34 patients with normal bladder mucosa. The results were compared with clinicopathologic parameters, and the prognostic value of <I>DBC1</I> was evaluated by Kaplan-Meier analysis and a multivariate Cox regression model.</P><P><B>Results</B></P><P><I>DBC1</I> expression was significantly decreased in patients with MIBC compared with those diagnosed with NMIBC (p=0.010). Patients with aggressive tumor characteristics had lower <I>DBC1</I> expression levels in NMIBC (each, p<0.05). By multivariate Cox regression analysis, low <I>DBC1</I> expression was a predictor of progression to MIBC (hazard ratio, 7.104; p=0.013). Kaplan-Meier estimates revealed a significant difference in tumor recurrence, progression to MIBC, and cancer-specific survival depending on the level of <I>DBC1</I> expression in NMIBC (log-rank test, each, p<0.05).</P><P><B>Conclusions</B></P><P>The expression of <I>DBC1</I> was associated with tumor aggressiveness, progression to MIBC, and survival in NMIBC. Our results suggest that <I>DBC1</I> expression can be a useful prognostic marker for patients with NMIBC.</P>
An Archaeochemical Microstructural Study on Koryo Inlaid Celadon
Ham, Seung-Wook,Shim, Il-wun,Lee, Young-Eun,Kang, Ji-Yoon,Koh, Kyong-Shin Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.11
With the invention of the inlaying technique for celadon in the latter half of the 12th century, the Koryo potters reached a new height of artistic and scientific achievement in ceramics chemical technology. Inlaid celadon shards, collected in 1991 during the surface investigation of Kangjin kilns found on the southwestern shore of South Korea, were imbedded in epoxy resin and polished for cross-section examination. Backscattered electron images were taken with an electron microprobe equipped with an energy dispersive spectrometer. The spectrometer was also used to determine the composition of micro-areas. Porcelain stone, weathered rock of quartz, mica, and feldspar composition were found to be the raw material for the body and important components in the glaze and white inlay. The close similarity between glaze and black inlay in the microstructure suggests that the glaze material was modified by adding clay with high iron content, such as biotite, for use as black inlay. The deep soft translucent quality of celadon glaze is brought about by its microstructure of bubbles, remnant and devitrified minerals, and the schlieren effect.