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Gadolinium-benzoate 착물의 열역학적, 적외선 및 자기적 성질에 관한 연구
金永仁,朴興才,崔星洛,尹錫丞 부산대학교 기초과학연구소 1992 부산대학교 기초과학연구소 연구논문집 Vol.12 No.-
수용액내에서 gadolinium-벤조산 착물형성 반응의 열역학적 함수값들을 이온상수 0.1M NaClO₄, 25℃ 조건하에서 구하였다. gadolinium-벤조산 착물의 안정도는 여분의 엔트로피 효과에 기인하는 것으로 판단되며, 벤조산 리간드의 경우 한 자리 리간드에 비해 높은 안정도 상수값을 나타내었다. 이러한 높은 안정도는 리간드내의 벤젠고리의 공액효과로 예측되었다. 합성된 Gd(ben)₃의 고채 IR 스펙트럼 결과, 벤조산 리간드가 두 자리 리간드로 작용하여 킬레이트를 형성하였으며, 80-300K 온도 범위에서의 자화율 데이터는 Curie-Weiss법칙에 잘 적용됨을 알 수 있었다. The thermodynamic parameters for the formation of gadolinium benzoate have been determined in the ionic medium of 0.1 M NaCl₄at 25℃ n aqueous solution. The thermodynamic results indicate that the complex is stabilized by the excess entropy effect caused by the dehydration of reacting ions. The especially high stability of Gd(Ⅲ)-benzoate compared to the monodentate ligand complexes might be ascribed to the conjugation effect of the benzene ring in the benzoate-ligand. IR Spectra show that benzoate anion acts as a bidentate ligand toward Gd^(3+) to form a chelate ring in solid state. Magnetic susceptibility data of the compound were also obtained and well described by Curie-Weiss law in the temperature range 80-300K.
충격관내에서의 n-핵산-산소 혼합물의 점화지연에 관한 연구
박종회,최기영,윤석승,최성락 충남대학교 자연과학연구소 1984 忠南科學硏究誌 Vol.11 No.1
The ignition delay of n-hexane-oxygen mixture in a shock tube has been theoretically calculated adapting the ignition reaction model of the H_2-O_2 fuel system at pre-ignition step. It has been presumed that the reaction model for the oxidation of n-butane, which was proposed previously, would be safely applied for the oxidation of n-hexane.
Sung-Min Lee,Chung Sock Choi,Cheol Jang,Kyung Cheol Choi IEEE 2010 IEEE transactions on electron devices Vol.57 No.1
<P>New pulse waveforms applied to an alternating-current plasma display panel (ac PDP) with an auxiliary electrode are investigated for the purpose of improving the panel's operating voltage margin and luminous efficacy. In the proposed pulse waveforms with reciprocal sustain pulses, a pair of positive and negative sustain pulses is applied to the sustain electrodes simultaneously and alternately. A positive auxiliary pulse is applied to the auxiliary electrode immediately after reciprocal sustain pulses. The voltage margin becomes wider, and the luminous efficacy is improved because of the suppression of the discharge toward the address electrode. In the another proposed pulse waveforms with reciprocal sustain and auxiliary pulses, a negative pulse, which is the same as the negative pulse of reciprocal sustain pulses, is additionally applied to the auxiliary electrode when reciprocal sustain pulses are applied. This negative auxiliary pulse can maintain a high level of luminous efficacy because it supports the effect of the auxiliary pulses. The measurement results show that the operating voltage margin is about twice wider than that of the typical pulse waveforms for an ac PDP with an auxiliary electrode; furthermore, the maximum luminous efficacy is able to reach 3.14 lm/W in terms of the measurement of the discharge in a 50-in XGA resolution (0.27 mm × 0.81 mm) panel with a white cell and a gas mixture of Ne+20%Xe.</P>
Effects of Auxiliary Electrode Width in AC Plasma Display Panels With Auxiliary Electrodes
Sung-Min Lee,Chung Sock Choi,Kyung Cheol Choi IEEE 2010 Journal of display technology Vol.6 No.12
<P>We investigated the effects of changing the width of the auxiliary electrode in an ac plasma display panel including centrally located auxiliary electrodes between the sustain electrodes, based on analyses of the discharge mode. A panel with auxiliary electrodes was driven by pulse waveforms that included auxiliary pulses applied to the auxiliary electrode immediately after every sustain pulse. The discharge modes are changed consecutively from mode 1 to mode 3-2 when the sustain or auxiliary pulse voltages are increased, which can be characterized as follows: 1) only the sustain pulse discharges are generated in mode 1; 2) one of a pair of the auxiliary pulse discharges is additionally generated in mode 2; and 3) the other auxiliary pulse discharge is also generated in mode 3-1 and mode 3-2. Distribution of the discharge mode changes in accordance with the width of the auxiliary electrode (the focus is on modes 1 and 2 because these modes are effective modes); as the auxiliary electrode is narrowed, the range of mode 1 becomes wide and the range of mode 2 becomes narrow. The wide range of mode 1 is attributed to the fact that the discharge of the auxiliary pulse is suppressed due to a longer gap between the sustain and auxiliary electrodes. The narrow range of mode 2 is caused by the discharge of the auxiliary pulse less affecting the discharge of the sustain pulse. Since the auxiliary electrode provides less of a decrease in the number of wall charges on the sustain electrodes, the voltage margin is improved for the case of the narrow auxiliary electrode. The luminous efficacy is mostly improved in mode 1 for the case of the narrow auxiliary electrode due to the auxiliary pulse with a higher voltage generating a larger number of space charges, as well as in mode 2 for the case of the wide auxiliary electrode due to a short electrode gap rendering a great number of wall charges decreasing.</P>
Sock-Sung Yun,Sung Kwon Kang*,Hong-Ryol Suh,Hyung-Sock Suh,Eun Kwang Lee,Jae-Kyung Kim,Chong-Hyeak Kim 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.8
The Ln(III) complexes with picrate ligand, [Sm(Pic)2(H2O)6]Pic•6H2O, 1, and [Ho(Pic)(H2O)7](Pic)2•3H2O, 2, have been synthesized and their crystal structures are analyzed by X-ray diffraction methods. Complex 1, crystallizes in the monoclinic P21/n space group and complex 2 in the triclinic P-1 space group. In complex 1, two picrate ligands coordinate to the Sm(III) ion, one of them in the bidentate fashion. There are one picrate anion and six water molecules in the crystal lattice. The nine-coordinated Sm(III) ion forms a slightly distorted tricapped trigonal prism. In complex 2, only one picrate ligand coordinates to the metal ion as a monodentate. There are two picrate anions and three water molecules in the crystal lattice. The eight-coordinated Ho(III) ion forms a distorted bicapped trigonal prism. Based on the results of the TG-DTG and DSC thermal analysis, it was analyzed that the lanthanide picrate complexes 1 and 2 are thermally decomposed in three distinctive stages, the dehydration, the picrate decomposition, and the formation of the metal oxide.
Kinetics of Complexation of Alkali Earth Metal Ions with 18-Crown-6-Ether in Methanol
Yun, Sock Sung,Kim, Seong Heon,Yang, Joon-Mook,Choi, Ki Young 충남대학교 기초과학연구소 1989 연구논문집 Vol.9 No.-
The rates of complexation of the 18-C-6(1,4,7,10,13,16-hexaoxacyclooctadecane) with K^+, Ca^2+, Sr^2+, and Ba^2+ in methanol solution have been determined at 25℃ by a pressure-jump technique. The Eigen Winkler mechanism has been applied to interprete the kinetic data. The results suggest that the rate determining step of the complexation in methanol is the rearrangement of the ligand in the outer sphere ion-dipolespair to form a stable encapsulated complex of the metal ion by the crown ether.
Stability Constants of Some Lanthanide Anthranilates
Yun, Sock Sung,Kim, Inn Hoe 충남대학교 자연과학연구소 1981 忠南科學硏究誌 Vol.8 No.2
수용액에서 Lanthanide-Anthranilate (1:1) 착화합물의 안정도 상수를 전위차 적정법에 의해서 구하였다. 측정은 25℃와 이온강도가 1M NaClO_4인 용액에서 이루어졌다. 실험결과들을 다른 유사한 착화합물의 안정도 상수와 비교 검토 하므로서 Anthranilate의 Amino기가 결합에 관여하는 가를 고찰하여 보았다.