非水溶媒 Dimethylformamide中에서 구리(Ⅱ)-α-Benzoinoxime錯物의 電氣化學的還元

李興洛,李在洙 慶北大學校 1978 論文集 Vol.25-26 No.-

The electrochemical reduction of copper(Ⅱ)-α-benzoinoxime complex in N,N-dimethylformamide as a non-aqueous solvent has been studied by polarography and chronopotentiometry. The copper(Ⅱ)-α-benzoinoxime complex was reduced to Cu(Hg) via two step involving two electrons as a whole. And the copper(Ⅱ) complex showed irreversible polarograms at a dropping mercury electrode and chronopotentiograms at a platinum electrode, which were all diffusion controlled. The half-wave potentials for the polarographic reduction of the copper(Ⅱ) complex were +0.15 and -0.22 volts versus a saturated calomel electrode. The quater potentials for the chronopotentiometric reduction of the copper(Ⅱ) complex were -0.66 and -1.73 volts versus the saturated calomel electrode.

FET형 반도체 마이크로센서 개발(Ⅲ)

손병기,이흥락,박이순,조진호,이성필,최평,서화일,박재윤,송경은,김창수 경북대학교 센서기술연구소 1995 연차보고서 Vol.1995 No.-

현재 의료진단, 화학공정의 모니터링이나 환경공학적 감시 및 제어 등의 분야에서 사용되고 있는 기존의 센서는 고가이며 용적이 클 뿐만 아니라 분석시간이 길고 사용하기 까다로운 것 등 여러 가지 문제점이 있다. 또한 측정환경에 영향을 주지 않을 만큼 충분히 작으며 빠른 분석시간을 가진 센서를 필요로 하고 있다. 본 연구에서는 기존의 센서들의 난점을 극복할 수 있는 새로운 형태의 FET형 전해질(electrolyte : H^+, K^+, Ca^2+, Na^+)센서소자 및 분석 시스템, 용존가스(O_2, CO_2)센서의 개발을 중점적으로 추진하였으며, FET형 압력센서, 습도센서 둥의 개별 FET형 센서에 관한 기초연구도 병행하였다. The conventional sensors have many problems such as high cost, large dimension, long analysis time and troublesome handling to apply to the fields of medical diagnosis, monitoring of chemical process and environmental monitoring/control. The main objects of this research are to develope a new FET type electrolyte(H^+, K^+, Ca^2+, Na^+)sensors, analysis system, and dissoved gas(O_2, CO_2)senors that can overcome the problems of the conventional sensors, and parallel basic researches on FET. type sensors such as pressure and humidity are also in progress.

FET형 반도체 마이크로센서 개발(Ⅱ)

손병기,이흥락,박이순,조진호,이성필,최평,서화일,고성택,박재윤,서장수,김창수 경북대학교 센서기술연구소 1994 연차보고서 Vol.1994 No.-

현재 의료진단, 화학공정의 모니터링이나 환경공학적 감시 및 제어 등의 분야에서 사용되고 있는 기존의 센서는 고가이며 용적이 클 뿐만 아니라 분석시간이 길고 사용하기 까다로운 것 등 여러 가지 문제점이 있다. 또한 측정환경에 영향을 주지 않을 만큼 충분히 작으며 빠른 분석시간을 가진 센서를 필요로 하고 있다. 본 연구에서는 기존의 센서들의 난점을 극복할 수 있는 새로운 형태의 FET형 전해질(electrolyte : H^+, K^+, Ca^2+, Na^+)분석 시스템, 용존가스(O_2, CO_2)분석 시스템의 개발을 중점적으로 추진하며, FET형 압력센서, 습도센서, 방사형 온도센서 등의 개별 FET형 센서에 관한 연구도 병행하고자 한다. Recently various kinds of sensors have been developed, being applicated to their own purpose. There are lots of difficulties to apply them to measurements in which the real-time monitoring is required without disturbing the surrounding environment. FET type semiconductor sensors, fabricated by the semiconductor integration technologies, have many advantages for their miniaturization, standardization, mass-production and in vivo/in situ monitoring. They also hold a very proper configuration for multi-functional sensors or integrated smart sensors, and wide availability by forming various kinds of physical or chemical sensing materials onto their sensing gates.

Acetonitrile內에서의 錯物 Mg-Eriochrome Black T의 組成에 關한 硏究

朴斗元,李興洛,黃金小 慶北大學校 1971 論文集 Vol.15 No.-

A complex of the metal indicator Eriochrome Black T with the alkaline earth metal magnesium in acetonitrile is studied by the method of continuous variations and mole-ratio. Previous literatures on the subject have described 1 to 1,2 to 1, or 3 to 1 complexes for magnesium in aqueous solvent. In agreement with the finding of Schwarzenbach in water, the dye Eriochrome Black T forms only 1 to 1 complex with magnesium in acetonitrile solvent.

폴리에스테르 섬유 감량시스템용 프로세서 타이트레이터 개발

조진호,이흥락,이종현,김명남,구성모,김무영,진경찬,유병희,강민수,김국진 경북대학교 센서기술연구소 1993 연차보고서 Vol.1993 No.-

폴리에스테르 섬유 감량시스템의 제어를 위해서는 처리조 내에서 감량되는 섬유가 목표 감량치에 도달했는지를 판단해 주는 장치가 필요하다. 본 연구에서는 가성소다용액의 초농도 및 섬유 감량 정도의 정확한 측정과 감량 종료시간의 산출 및 이에 따른 종료신호를 발생할 수 있는 폴리에스테르 섬유 감량기 전용의 자동적정장치를 개발하였다. To control caustic soda treatment system for the polyester fabric reduction, we need the device to determine that the fabric has been arrived target reduction value. In this study, we develope an automatic process titrator for the caustic soda treatment system. Major functions of the target titrating system are accurate measurements of the caustic soda concentration and then producing the end point signal for caustic soda treatment system.

海水로부터 우라늄의 濃縮分離

黃正儀,鄭倧在,李興洛 慶北大學校 文理科大學 1978 文理學叢 Vol.5 No.-

The present demand for all civil and military purpose exceeds a Korean surplus of uranium resources. Natural sea water is known to contain uranium in the mean concentration of about 3.3 ㎍ U/㎏ in the from of UO_2(CO_3)_3^4- solution. Though sea water has its trace quantity of uranium, its recovery by extraction method and untilization as energy sources at present is very remarkable in many nations. In this paper it was surveyed systematically the present world status in the extraction studies of uranium from sea water. Only a simple batch technique is described here, which permits an extraction of uranium from artificial and natural sea water. The basis of the technique is adsorption of the uranyl ion (UO_2(CO_3)_3^4- on solid adsorbent. The adsorbents were five kinds of activated TiO_2·H_2O series, titanium trihydroxy phosphate, zirconyl pyrophosphate, and zirconyl hydroxide. Of these adsorbents the most active material was TiO_2·H_O precipitated from the dissolved K_2TiF_6·H_2O in the 1 : 4 H_SO_4 aqueous solution by adding (NH_4)_2CO_3 solid until the pH of the filtered solution became 5.2. This extraction technique was successful to applying to the Korean beach sea water at Bizindo, Hansan-myun, Tongyung-gun, Kyungsangnam-do.

The Amperometric Determination of Cholesterol Using New Enzyme Reactors

Lee, Heung Lark,Lee, Eun Suk 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1

The continuous amperometric assay for determining total cholesterol in human serum was based on incorporating cholesterol ester hydrolase, cholesterol oxidase and peroxidase in enzyme reactors. The enzyme reactors were prepared by colvalent bonding of enzyme using glutaraldehyde to the long chain alkylamine silanized controlled-pore glass support. The hydrogen peroxide coupled with ferrocyanide ion in the presence of peroxidase was oxidized to produce ferricyanide ion that was detected at a glassy carbon working electrode with applied potential of -50 mV vs. Ag/AgCl reference electrode. The ferricyanide ion was stoichiometrically related to the total cholesterol concentration. The optimal conditions were as follows; flow rate of carrier solution(3.0 x 1O^(-2) M K_(4)Fe(CN)_(6) + Triton X-100 2.0% + 0.10 M phosphate buffer of pH 7.3), 0.30 ml/min; injection volume of sample solution, 20 μl.

관형 PVC 막 pH 전극을 이용한 시안화이온의 연속ㆍ자동화 정량

이홍락(Heung Lark Lee),양승태(Seung Tae Yang) 한국분석과학회 1989 분석과학 Vol.2 No.1

[논문(화학)]완충용액과 효소고정화막의 조성에 따른 pH-ISFET 포도당센서의 감응특성

이흥락(Heung Lark Lee),양승태(Seung Tae Yang),정동숙(Dong Sook Jung),김창수(Chang Soo Kim),손병기(Byung Ki Sohn) 한국분석과학회 1992 분석과학 Vol.5 No.2

물 및 디메틸포름아마이드中에서 4-(2-Pyridylazo)-resorcinol의 分光電氣化學的 環元

李興洛,裵俊雄,李在鶴,吳相協 慶北大學校 1988 論文集 Vol.45 No.-

Spectroelectrochemistry involve the combination of an electrochemical technique with a spectroscopic techinque so that the two measurements may be performed simultaneously in an electrochemical cell. One of the most generally useful spectroelectrochemical technique involves spectral observation of a thin layer of solution. Thin-layer spectroelectrochemistry at the optically transparent thin-layer electrode(OTTLE) takes advantage of the rapid electrolysis (30∼60 sec.) and small volume features of thin-layer electrochemistry. This study has used controlled potential as the excitation signal. Potential control provides a facile means of presicely adjusting the redox potential of the thin solution layer as determined by the Nernst equation for reversible systems: E_applied=E^0'+0.059/n log (O)/(R) In experiment, the slopes of Nernstian plot were 28.3mV in aqeous solution and 53mV in N, N-dimethylformamide(DMF) solution. The results of this study showed that the reduction mechanisms of 4-(2-pyridylazo)-resorcinol(PAR) were one two-electron step in aqueous solution and two one-electrons steps in DMF solution. The formal reduction potentials(E^0') of the PAR were -0.574 volts vs. S.C.E. in aqueous soltion and -0.74 volts vs. Ag/AgClO_4 in DMF solution. These results were generally similar to the reduction mechanism of the other cyclic hydrocarbons in the aprotic solvent. In aprotic solvent, the product of the first electron transfer is expected to be a relatively stable anion radical. In this experiment tetraethylammonium perchlorate was used as a supporting electrolyte of the DMF solution.