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손태철,박근호,김남석,이경구,주찬홍 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
아조벤젠기를 가진 지방산과 지방산 단분자막에서의 단점을 보안하기위해서 도입한 인지질의 혼합물 LB 막으로 ITO glass에 Langmuir-Blodgett법으로 누적하여 광이성질화 현상과 전기화학적 특성을 cyclic voltammetry으로 측정하였다. 지방산과 인지질의 혼합물 Langmuir-Blodgett막의 광이성화 현상은 360nm와 450nm 빛에 의해서 어떠한 변화가 일어나는지 UV/Vis spectrum으로써 조사하였고, 전기화학적 특성은 용액에서 cyclic voltammetry를 조사하였다. cyclic voltammetric measurement에 기준 전극으로는 Ag/AgCl, counter electrode에는 Pt wire를 사용하여 측정하였다. 전기적 특성이 용액에서 어떠한 현상이 나타내는지 조사하였고, 전해질(NaClO<sub>4</sub>)의 농도와 막 층수에 따라 어떤 경향을 보여주는지를 조사하였다. 그 결과 8A5H 단분자막과 인지질(DLPC)와의 혼합막에서는 비가역 산화반응만 나타내는 전기화학적 특성이 보여지며, 층수가 증가 하고, 전해질의 농도가 증가할수록 cyclic voltammetry에서 산화 전류가 증가 하였다.
손태철 ( Tae Chul Son ),김남석 ( Nam Seok Kim ),박근호 ( Keun Ho Park ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.2
N/A We studied electrochemical characteristics of Langmuir-Blodgett(LB) films by using cyclic voltammetry with a three-electrode system. An Ag/AgCI as a reference electrode, a platinum wire as a counter electroed and LB film-coated indium tin oxide(ITO) as a working electrode were used to study electrochemical characteristics at a various conaentration of NaCIO_4 solution. LB films were reduced from initial potential to -1350 mV, continuously oxidized to 1650mV and returned to the initial point. The scan rate was 100mV/s. The monolayer surface morphology of the LB film have been measured by Atomic Force Microscope(AFM).As a result, We comfirmed that the microscopic properties of LB film by AFM showed the good orientation of momolayer molecules and the thickness of monolayer was 3.5-4.1nm. The cyclic voltammograms(CV) of the ITO-coated glass showed the peak potentials for the reduction-oxidation reation. LB films of 4-octyl-4`-(5-carboxy-pentamethyleneoxy)azobenzene(8A5H) / a-phosphayidyl choline, dilauroyl(DLPC) seemed to be irreversible process caused by the oxidation current from the cyclic voltammogram. The current of oxidatation increased at cyclic voltammogram by increasing 8A5H density in LB films. The diffusivity(D) of LB films increased with increasing of a 8A5H amount and was inversely proportional to the concentration of NaCIO_4 solution.
손태철(Tae Chul Son),민창훈(Chang Hun Min),박근호(Keun Ho Park) 한국유화학회 2008 한국응용과학기술학회지 Vol.26 No.4
We carried out this experiment to observe an electrochemical properties for LB films of alkyl compounds by the cyclic voltammetry. Alkyl bromides was deposited by using the Langmuir- Blodgett method on the ITO glass. We measured to an electrochemical measurement by using cyclic voltammetry with a three-electrode system(an Ag/AgCl reference electrode, a platinum wire counter electrode and LB film-coated ITO working electrode) in 0.5, 1.0, 1.5 and 2.0 N NaClO4 solution. A measuring range was reduced from initial potential to -1350 mV, continuously oxidized to 1650 mV. The scan rate were 100 mV/s. As a result, an electrochemical properties of the LB films of alkyl bromides appeared irreversible process caused by only the oxidation current from the cyclic voltammogram. The diffusivity(D) effect of LB films decreased with increasing of alkyl compounds amount.
김남석,손태철,박근호,이경구,주찬흥,Kim, Joon 한국공업화학회 2002 응용화학 Vol.6 No.1
We have investgated the photoisomerization using light irradiation 8A5H-DLPC mixture(1:1) LB film accumulated by monolayer on an ITO. We determined electrochemical measurement by using cyclic voltammetry with a three-electrode system, An Ag/AgC1 reference electrode, a platinum wire counter electrode and LB film-coated ITO working electrode measured in NaC1O_4 solution at a variable concentration. The scan rate was 100mV/s.
Thermal Decomposition of Copolymers of Styrene and n-Butylmethacrylateobtained from CSTR
김남석,이경구,손태철,박근호,설수덕,김덕술 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
Thermal decomposition of the copolymer of styrene(St.) with n-butylmethacylate(BMA) were investigated. The copolymer were obtained in a continuous tank reactor(CSTR) using toluene and benzoylperoxide, as solvent and initiator, respectively, at 80°C. The volume was 0.3 liters and residence time 3hours. The thermal decomposition followed the second order kinetics for St./BMA copolymers. The activation energies of thermal decomposition were in the range of 24 ~ 47 kcal/mol for St. with BMA copolymer and a good additivity rule was observed against composition copolymer. The thermal decomposition followed the second order kinetics for St./BMA copolymers. The thermogravimetric trace curve agreed well with the theoretical calculation.
Thermal Decomposition of Copolymers of Styrene and n-Butylmethacrylate obtained from CSTR
Kim, Nam Seok,Lee, Kyung Gu,Sohn, Tae Cheol,Seul, Soo Duk,Kim, Duck Sook,Park, Keun Ho 한국공업화학회 2002 응용화학 Vol.6 No.1
Thermal decomposition of the copolymer of styrene(St.) with n-butylmethacylate(BMA) were investigated. The copolymer were obtained in a continuous tank reactor(CSTR) using toluene and benzoylperoxide, as solvent and initiator, respectively, at 80℃. The volume was 0.3 liters and residence time 3hours. The thermal decomposition followed the second order kinetics for St./BMA copolymers. The activation energies of thermal decomposition were in the range of 24 ~ 47 kca/mol for St. with BMA copolymer and a good additivity rule was observed against composition copolymer. The thermal decomposition followed the second order kinetics for St/BMA copolymers. The thermogravimetric trace curve agreed well with the theoretical calculation.