니켈(Ⅱ)-거대고리 착물과 폴리 우레탄으로 변성한 이중 전극에서 에피네피린의 전기화학적 정량

배준웅,Guang-Ri Xu,조형화,권수경,이상학 한국전기화학회 2007 한국전기화학회지 Vol.10 No.3

PSCF3737(Pr0.3Sr0.7Co0.3Fe0.7O3) is a good candidate cathode material for IT-SOFC(intermediate tempera-ture solid oxide fuel cel) because of high MIEC(mixed ionic electronic conductor) conductivity. In this study, thecharacteristics of PSCF3737 was investigated and optimizations of sintering temperature and thickness forPSCF3737(Pr0.3Sr0.7Co0.3Fe0.7O3) was carried out. Impedance responses were divided into two parts by frequencyregion. Middle frequency part (~102 Hz) was concerned with oxygen reduction reaction on surface and low frequencypart (~101 Hz) was related with oxygen diffusion. The reasonable sintering temperature and thickness of cathodewere 1200oC and about 27m with regard to EIS(electrochemical impedance spectroscopy). ASR(areas specific resis-tance) of optimized cathode is 0.15Ω.cm2 at 700oC.

구리의 전압전류법적 파라미터에 미치는 압력의 영향

배준웅,이흥락,박홍순,Zun Ung Bae,Heung Lark Lee,Hong Soon Park 대한화학회 1989 대한화학회지 Vol.33 No.4

Cu(II)의 환원반응의 전압전류법적 파라미터에 미치는 압력의 영향을 0.5 M KCl 수용액 중에서 조사하였다. 미소백금전극, 표준칼로멜전극 및 나선형 백금선을 작업전극, 기준전극 및 보조전극으로 사용하였다. 압력을 1기압에서 1800기압까지 증가시킴에 따라 제 1환원파의 반파전위는 음전위쪽으로 많이 이동하였다. 그리고 제 1환원파와 제 2환원파의 확산전류는 1기압에서 약 1,000기압까지는 증가하였으나, 1,000기압 이상에서는 조금씩 감소하였다. 전 실험 압력범위($1{\sim}1800$기압)에서 제 1환원파의 확산 전류와 Cu(II)의 농도 사이에는 좋은 선형관계가 성립하였다. 각 환원반응의 가역성은 압력증가에 영향을 받지 않았다. The dependence of voltammetric parameters on the pressure for the reduction of Cu(II) in 0.5M KCl aqueous solution has been studied. In this system micro platinum electrode, standard calomel electrode and a helix type of platinum wire were used as the working, the reference and the auxilary electrode, respectively. With increasing the pressure from 1 to 1,800 bars, the half wave potentials of first reduction wave are shifted to the more negative potentials. And the diffusion currents of first and second reduction wave become considerably larger with increase in pressure from 1 to about 1,000 bars but are getting smaller beyond 1,000 bars. The good linear relationships between diffusion current and the concentrations of Cu(II) are established over all pressure range($1{\sim}1,800$ bars). The reversibility of the each reduction step is not changed with increasing pressure.

4-(2-Thiazolylazo)-resorcinol 을 킬레이트제로 사용한 Ni(Ⅱ)의 鹽析抽出定量

裵俊雄,李興洛,張惠榮,徐戊龍 경북대학교 1987 論文集 Vol.43 No.-

As a part of analytical application of 4-(2-thiazolylazo)-resorcinol(TAR), the extraction method with salting-out technique was applied to the determination of nickel(Ⅱ) ion in aqueous solution. After nickel(Ⅱ) was extracted from the buffered aqueous solution into accetonitrile layer as a Ni(Ⅱ)-TAR chelate by salting-out technique, the visible absorption spectrum was recorded. In this experiment ammonium sulfate was used as a salting-out reagent. The effects of amount of ammonium sulfate and extracting reagent TAR on the extractability, the relationship between pH of the aqueous phase and the extractability of Ni(Ⅱ)-TAR chelate, and the calibration curve for the determination of Ni(Ⅱ) by spectrophotometry has been evaluated. And the effects of diverse ion on the determination of Ni(Ⅱ) by this method have been investigated.

아세토니트릴 溶媒중에서 1-(2-Thiazolylazo)-2-naphthol 의 폴라로그래프적 거동

배준웅,서무룡,Zun Ung Bae,Moo Lyong Seo 대한화학회 1988 대한화학회지 Vol.32 No.1

반양성자성 용매인 아세토니트릴 중에서 1-(2-thiazolylazo)-2-naphthol (이하 TAN으로 줄임)의 폴라로그래프적 성질을 조사하였다. 직류폴라로그램으로부터 환원전류의 유형과 양성자 주게 인물의 첨가에 따른 영향을 검토하였다. 그리고 환원반응에 관여한 전자수는 정전위분해법으로 구하였다. 또 일정전위전해생성물의 UV-Vis Spectrum과 IR-Spectrum으로부터 전해생성물을 확인하였다. 이상의 실험결과로부터 아세토니트릴 용매중에서 TAN은 1전자 4단계의 환원과정을 거쳐 최종적으로 아민화합물이 됨을 알았다. 또 각 환원과정은 모두 가역적이었으며, 각 단계의 환원전류는 확산지배적이었다. The Polarographic behavior of 1-(2-thiazolylazo)-2-naphthol (TAN) in acetonitrile solution was studied. From the DC polarograms of TAN in acetonitrile solution, the type of reduction current and the effect of proton donor such as water have been investigated. In order to explain the reduction mechanism, the number of the electrons for each reduction step was measured by controlled potential coulometric technique and the electrolysis products were identified by UV-Vis spectroscopy and IR spectroscopy. The results were shown that the reduction of TAN in acetonitrile solution occurred with four-one electron steps. In addition, each reduction step was considerably reversible and the reduction current was diffusion controlled.

금호강 수질의 장기변동에 관한 연구(II)

배준웅,이상학,이성호,Bae, Zun Ung,Lee, Sang Hak,Lee, Sung Ho 대한화학회 2001 대한화학회지 Vol.45 No.1

금호강 하천수의 수질오염 현황을 종합적으로 조사하기 위해 1993년 9월부터 1999년 8월까지 6년간 18회에 걸쳐 13개 지점에서 pH, BOD, COD, DO, SS, 전기전도도, 유지류, ABS와 페놀 등 총 9개 항목의 수질을 측정하였다. 6년간의 자료값은 분포가 넓으므로 각 3년 간 즉 1993. 9월부터 1996.8월까지(이하 Part Ⅰ기간으로 "2차 연구"라 한다.)와 1996. 9월부터 1999. 8월까지(이하 Part Ⅱ 기간으로 "3차 연구"라 한다. )자료로 세분화하였으며, 다음과 같은 결론을 얻었다. 전 조사지점에 대한 각 항목의 "2차 연구"와 "3차 연구"의 각 3년간의 평균값은 각각 다음과 같다. pH는 7.9, 8.0; BOD는 4.88ppm, 2.86ppm; COD는 9.66ppm, 7.40ppm; DO는 9.0ppm, 8.94ppm; SS는 6.9ppm, 6.0ppm; 전기전도도는 618.0umho/cm, 541.0umho/cm; 유지류는 2.63ppm, 5.43pm; ABS는 3.57ppm, 0.94ppm; Phenol은 0.98ppm과 0.01ppm이었다. 조사 기간 중인 "2차 연구"의 평균값을 기준으로 "3차연구" 결과에서 오염량의 변화는 다음과 같았다. BOD, COD, SS 전기전도도, ABS 와 페놀은 각각 1/1.71, 1/1.31, 1/4.15, 1/3.80 과 1/98로 감소하였으며, 수온, pH와 DO는 큰 변화가 없었다. 그러나 유지류는 2.06배의 오염증가를 보였다. In order to study the long-term change of water quality, water analysis for 9 items was conducted at 13 sites surrounding the Kumho river system for 18 times from September 1993 to August 1999. Analytical items for the study of water quality are as follows; water temperature, pH, BOD, COD, DO, SS, electrical conductivity, oil and grease, ABS and phenol. The six year term was divided into Part I(second study) and Part Ⅱ(third study), which covers the term from September 1993 to August 1996 and the term from September 1996 to August 1999, respectively. The mean values obtained for three years for water temperature, pH, BOD, COD, DO, SS, electrical conductivity, oil and grease, ABS and phenol for the Part I period showed 18.4$^{\circ}C$, 7.9, 4.88 ppm, 9.66 ppm, 9.0 ppm, 618.0 umho/cm, 6.9 ppm, 2.63 ppm, 3.57 ppm and 0.98 ppm, respectively. The mean values obtained for water temperature, pH, BOD, COD, DO, SS, electrical conductivity, oil and grease, ABS and phenol for the Part Ⅱ period showed 18.0$^{\circ}C$, 8.0, 2.86 ppm, 7.40 ppm, 8.94 ppm, 541.0 umho/cm, 6.0 ppm, 5.43 ppm, 0.94 ppm and 0.01 ppm respectively. The values of BOD, COD, SS, electrical conductivity, ABS and phenol in the second period were found to be decreased by 1/1.71, 1/1.31, 1/4.15, 1/3.80 and 1/98, respectively. The values of water temperature, pH and DO were nearly constant. However, the concentrations of oil and grease were found to be increased about 2.06 times in the second period.

정상전단유동의 급개시에 따른 폴리에틸렌옥사이드 수용액의 응력성장거동

배준웅,이지석,송기원,Bae, Jun-Woong,Lee, Ji-Seok,Song, Ki-Won 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.5

The objective of this study is to systematically elucidate the transient rheological behavior of viscoelastic polymer solutions at start-up of steady shear flow. Using a strain-controlled rheometer [Advanced Rheometric Expansion System (ARES)], the stress overshoot behavior of concentrated aqueous poly(ethylene oxide) [PEO] solutions has been thoroughly investigated with applying a number of shear rates to these polymer solutions. In this article, the typical stress growth behavior of aqueous PEO solutions was firstly presented on the basis of experimentally obtained data and nextly the effects of shear rate, molecular weight, and concentration on this behavior were discussed in depth. In order to theoretically predict the stress growth behavior, the Wagner constitutive equation (a time-strain separable constitutive equation) and the Bird-Leider model were employed and the applicability of these models was examined in detail. The main findings obtained from this study can be summarized as follows: (1) At the inception of low shear rates, the stress overshoot behavior is not observed but the shear stress progressively increases with time until the steady state stress value is reached. As the shear rate is increased, however, aqueous PEO solutions exhibit a pronounced stress overshoot followed by a stress decay to reach the steady state flow condition. (2) The maximum shear stress increases linearly with an increase in shear rate in a double logarithmic scale and becomes larger with an increase in concentration. (3) The time at which the maximum shear stress occurs, $t_{max}$, shows a linear relationship with the inverse of shear rate in a double logarithmic scale, regardless of molecular weight and concentration. (4) When the Wagner constitutive equation is used, the Wagner damping function exhibits superior performance to the Soskey-Winter damping function in predicting the transient stress growth behavior of aqueous PEO solutions. (5) The Bird-Leider empirical model can be successfully used for predicting the transient stress growth behavior of aqueous PEO solutions. This model is especially effective for expressing the maximum shear stress as well as the time at which this maximum stress is observed.

Bilirubin의 전압전류법적 파라미터에 미치는 압력의 영향

배준웅,이흥락,김경호,박태명,Bae, Jun Ung,Lee, Heung Rak,Kim, Gyeong Ho,Park, Tae Myeong 대한화학회 1990 대한화학회지 Vol.34 No.4

미소 백금전극을 작업전극으로 사용하여 0.1 M TEAP-DMSO 용액 중에서 Bilirubin(BR)의 산화반응의 전압전류법적 파라미터에 미치는 압력의 영향을 조사하였다. 1기압에서 1,800기압까지 압력을 증가함에 따라 산화파의 봉우리 전위는 양전위쪽으로 이동하였다. 또 압력의 증가에 따라 봉우리 전류는 계속적으로 감소하였다. BR의 산화전류는 확산지배적인 전류임을 알 수 있었다. 압력증가에 따라서 산화반응의 가역성은 거의 영향을 받지 않았다. 또한 실험 압력범위내(1~1,800기압)에서 산화파의 봉우리 전류와 Bilirubin의 농도 사이에는 좋은 직선성이 성립하였다. The pressure effect of voltammetric parameters for the oxidation of Bilirubin in 0.1 M TEAP-DMSO solution at micro Pt electrode has been investigated. With increasing the pressure from 1 to 1,800 bars, the peak potential of oxidation wave shifted to the more positive potential. The peak current becomes considerably smaller with increasing the pressure. The oxidation currents of Bilirubin was found to be diffusion controlled over all pressure ranges. The reversibility of oxidation step did not change with increasing pressure. The linear relationships were observed over all pressure ranges (1-1,800 bars).

금호강 수질의 장기 변동에 관한 연구

배준웅 경북대학교 환경과학연구소 1995 環境科學論文集 Vol.9 No.1

N,N-Dimethylformamide 용매 중에서 Biliverdin의 전기화학적 거동

배준웅,이흥락,박태명,Zun Ung Bae,Heung Lark Lee,Tae Myeong Park 대한화학회 1993 대한화학회지 Vol.37 No.8

비양성자성 용매인 N,N-dimethylformamide(DMF) 중에서 Biliverdin(BV)의 전기화학적인 환원거동을 직류폴라로그래프법, 순환전압전류법 및 정전위 전기량법으로 조사하였다. 또한 BV의 최종 환원생성물을 UV-Vis spectroscopy로 조사하였다. DMF 용매 중에서 BV는 -0.71 V vs. Ag/Ag$^+$와 -0.91 V vs. Ag/Ag$^+$ 에서 2개의 환원파를 보였다. 각 환원파의 전류유형은 제 1환원파는 확산지배적인 전류였으며, 제 2환원파는 반응성 전류가 약간 포함된 확산전류이었다. 그리고 제 1단계의 환원과정은 비가역적이었다. 각 환원단계에 관여하는 전자수는 1개씩 이었으며, BV은 DMF 용액 중에서 1전자 2단계의 환원과정을 거쳐서 Bilirubin으로 환원되었다. The electrochemical reduction behavior or Biliverdin (BV) in N,N-dimethylformamide solvent was studied by DC polarography, cyclic voltammetry and the controlled potential coulometry. The reduced product was indentified by UV-Vis spectroscopy. In DC polarogram, two reduction waves of BV were founded. The half wave potentials of two reduction waves were -0.71 and -0.91 V vs. Ag/Ag$^+$ respectively. The current type of the 1st reduction wave was diffusion-controlled and the 2nd was diffusion current containing a little kinetic current. The 1st electrochemical reduction process was irreversible and BV reduced to Bilirubin.

N,N-Dimethylformamide 용액 중에서 Zn(II)-Bilirubin 착물의 전기화학적 거동

배준웅,이흥락,박태명,서무룡,Zun-Ung Bae,Heung-Lark Lee,Tae-Myung Park,Moo-Lyong Seo 대한화학회 1993 대한화학회지 Vol.37 No.7

DMF 용액 중에서 zinc(II) 이온과 copper(II) 이온의 bilirubin과의 착물형성 여부를 조사하고 Zn(II)-bilirubin(이하 Zn(II)-BR로 줄임) 착물의 전기화학적 성질을 여러가지 전기화학적인 방법으로 조사하였다. Zn(II)는 DMF 용액 중에서 bilirubin과 착물을 형성하였으나, Cu(II)는 bilirubin과 착물을 형성하지 않고 오히려 bilirubin의 산화를 촉진시켰다. Zn-BR 착물은 3단계의 환원과정을 거치며, 제1파와 제2파의 환원전류는 반응성 전류가 약간 포함된 환산전류이었으며, 제3파의 환원전류는 확산지배적인 전류이었다. The complexation of bilirubin with zinc(II) and copper(II) ions was studied spectrophotometrically. In the zinc(II)-bilirubin (Zn-BR) system, complex is formed, but the copper(II) ion oxidizes bilirubin to biliverdin and then to the further oxidation products. The electrochemical reduction behavior of ZN-BR complex has been investigated with DC polarography and cyclic voltammetry. The three polarographic waves were obtained for the reduction of ZN-BR complex in DMF solution. Thde reduction current of the third wave was diffusion current, but that of the first and the second waves contained a little kinetic current.