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기능성 전극의 전기촉매로의 응용 - Poly - MePMP+BF4- / Ferri - ferrocyanide / Ascorbic Acid 계
장동훈,오승모 ( Dong Hun Chang,Seung Mo Oh ) 한국공업화학회 1992 공업화학 Vol.3 No.1
기능성 전극(chemically modified electrodes)을 이용한 전기촉매반응을 조사하였다. 고분자 지지체로서 음이온 교환이 가능한 poly-[1-methyl-3-(pyrrol-1-ylmethyl) pyridinium]을 사용하였는데 이는 정전류 방법으로 직접 전극표면에 중합시켰다. 전극표면에 코팅되는 필름의 두께는 중합시 전체 전하량으로 조절하였으며, SEM을 이용하여 두께를 측정하였고, 필름의 두께와 전하량과의 직선관계를 조사하였다. 전기촉매반응에 활성을 갖는 ferro/ferricyanide 이온은 빠른 속도로 이온교환이 가능하였으며, 이온교환되는 양은 cyclic voltammetry 실험 결과 1.2∼1.3M이었다. 필름내에 존재하는 ferro/ferricyanide 이온이 ascorbic acid 산화반응의 매개체임을 cyclic votammetry 실험을 통하여 알 수 있었고, RDE 실험을 통하여 반응속도론적 파라미터를 규명하였는데 본 실험의 조건에서 Saveant 등의 모델 중 ER+S에 해당됨을 알 수 있었다. 이상적인 모델인 R+S가 되기 위하여 기능성 전극이 갖추어야 할 조건을 제시하였다. Chemically-modified electrodes were fabricated and their electrocatalytic behaviors have been investigated. As a modifying layer, poly-[1-methyl-3-(pyrrol-1-ylmethyl) pyridinium] was electropolymerized onto Pt electrodes under constant current. The thickness of the polymer film was controlled by means of total charge consumed during the electropolymerization. SEM was used to measure the thickness. There was a linear relationship between the passed charge and the film thickness. Ferro/ferricyanide, used as an electron mediator in this study, was rapidly ion-exchanged into the polymer layer with its concentration of 1.2∼1.3M. It was found that electrooxidation of ascorbic acid is catalyzed by incorporated ferri/ferrocyanide couple. Kinetic parameters for elecrooxidation were determined by RDE experiments. The results indicate that the present system corresponds to ER+S case based on the Saveant theory. Improving methods have been proposed to be R+S case which is ideal for electrocatalysis.
시·도 교육청별 중·고등학교의 시설기준과 충북지역 현상설계 학교의 스페이스프로그램 비교 연구
장동훈,정진주,Chang, Dong-Hoon,Jung, Jin-Ju 한국교육시설학회 2015 敎育施設 Vol.22 No.3
Under the establishment and operating regulations of school presented only minimum standard for the founding of the school. Therefore, It is intended to suggest the reasonable space standard of the school facility, through comparison & analysis of facility standard in each city and provincial education office. Especially, The facilities standard of Chungcheongbuk-do Office Of Education has been exceeded standardization of architectural space which is proposed the Ministry of Education, and they has made the various learning space reflected creative ideas by designing all of the new school competition since 2000. In order to deal with reacting the changing method of studying like as the examples of Middle & High school in Chungcheongbuk-do, they need to set aside the enough required area for a head of students and the common space which is more than 40% in the total area according to the various learning space, securing the supporting facilities, and break & movement of the students. Moreover, Each of the city and provincial education offices are needed to establish the standardization of proper area for space organization of the planned school throughout upcoming competition.
장동훈,오승모,Chang, Dong-Hun,Oh, Seung-Mo 한국공업화학회 1992 공업화학 Vol.3 No.1
Chemically-modified electrodes were fabricated and their electrocatalytic behaviors have been investigated. As a modifying layer, poly-[1-methyl-3-(pyrrol-1-ylmethyl) pyridinium] was electropolymerized onto Pt electrodes under constant current. The thickness of the polymer film was controlled by means of total charge consumed during the electropolymerization. SEM was used to measure the thickness. There was a linear relationship between the passed charge and the film thickness. Ferro/ferricyanide, used as an electron mediator in this study, was rapidly ion-exchanged into the polymer layer with its concentration of 1.2~1.3M. It was found that electrooxidation of ascorbic acid is catalyzed by incorporated ferri/ferrocyanide couple. Kinetic parameters for electrooxidation were determined by RDE experiments. The results indicate that the present system corresponds to ER+S case based on the Saveant theory. Improving methods have been proposed to be R+S case which is ideal for electrocatalysis. 기능성 전극(chemically modified electrodes)을 이용한 전기촉매반응을 조사하였다. 고분자 지지체로서 음이온 교환이 가능한 poly-[1-methyl-3-(pyrrol-1-ylmethyl) pyridinium]을 사용하였는데 이는 정전류 방법으로 직접 전극표면에 중합시켰다. 전극표면에 코팅되는 필름의 두께는 중합시 전체 전하량으로 조절하였으며, SEM을 이용하여 두께를 측정하였고, 필름의 두께와 전하량과의 직선관계를 조사하였다. 전기촉매반응에 활성을 갖는 ferro/ferricyanide 이온은 빠른속도로 이온교환이 가능하였으며, 이온교환되는 양은 cyclic voltammetry 실험 결과 1.2~1.3M이었다. 필름내에 존재하는 ferro/ferricyanide 이온이 ascorbic acid 산화반응의 매개체임을 cyclic votammetry 실험을 통하여 알 수 있었고, RDE 실험을 통하여 반응속도론적 파라미터를 규명하였는데 본 실험의 조건에서 Saveant 등의 모델 중 ER+S에 해당됨을 알 수 있었다. 이상적인 모델인 R+S가 되기 위하여 기능성 전극이 갖추어야 할 조건을 제시하였다.
전계인가 진공 증착법으로 제작된$\beta$ -PVDF (Poly(vinylidene fluoride)) 박막의 초전 특성
장동훈,강성준,윤영섭,Chang, Dong-Hoon,Kang, Seong-Jun,Yoon, Yung-Sup 대한전자공학회 2002 電子工學會論文誌-SD (Semiconductor and devices) Vol.39 No.5
전계인가 진공증착법으로 β상을 가지는 PVDF (Polyvinylidene Fluoride) 박막을 제작한 후, dynamic 방법으로 초전 특성을 측정하여 초전형 적외선 센서의 응용가능성에 대하여 조사하였다. PVDF 박막의 응답특성이 저주파와 고주파 영역에 따른 변조 주파수의 주파수 분산 (dispersion)으로 고려되었고, 그에 따른 초전 특성의 주파수 의존성을 관찰하였다. 저주파 (2∼100㎐) 영역에서 분역의 재배향 (reorientation) 되는 속도는 변조주파수의 속도보다 빠르므로 분극의 변화량이 증가하여 최대 값을 나타낸다. 반면에 고주파 (100∼1000㎐) 영역에서 분역의 재배향은 주파수 증가에 따라 방해를 받아 분극의 변화량이 억제되어 초전 응답이 감소하는 것을 알 수 있다. 초전계수와 전압감도 및 비검출능을 위한 재료평가지수는 각각 3.2×10/sup -10/C/㎠·K, 2.34×10/sup -10/C·cm/J 1.32×10/sup -9/C·cm/J이었고, 잡음등가전력과 비검출능은 각각 1.66×10/sup -7/W/㎐/sup ½/, 6.03×10/sup 5/cm·㎐/sup ½/W로 나타났다. The PVDF (Polyvinylidene Fluoride) thin film having P phase is prepared by the vacuum deposition with applying the electric field and its pyroelectric properties are studied by using a dynamic method to examine the possibility of the application to the pyroelectric IR sensor. The pyroelectric responses of the PVDF thin film are characterized as the frequency dispersion in both low and high modulation frequency regions, and their frequency dependences are observed. In the low frequency region (2~10Hzz), the polarization can easily rotate with the increase of modulation frequency and show the maximum since the reorientation rate of domains is higher than the modulation frequency. On the other hand, in the high frequency region (100~1000Hz), the pyroelectric response decreases as the frequency increases, because the reorienatation rate of domains is suppressed and thus, the change of polarization decreases. Pyroelectric coefficient, figure of merits for noise equivalent power and detectivity of the PVDF thin film are measured as 3.2$\times$10$^{-10}$ C/$\textrm{cm}^2$.K, 2.34$\times$10$^{-10}$ C.cm/J and 1.32$\times$10$^{-9}$ C.cm/J, respectively. Also, the noise equivalent and the detectivity are 1.66$\times$10$^{-7}$ W/H $z^{$\sfrac{1}{2}$}$, 6.03$\times$10$^{5}$ cm.H $z^{$\sfrac{1}{2}$}$W, respectively.
시·도 교육청별 중·고등학교의 시설기준과 충북지역 현상설계 학교의 스페이스프로그램 비교 연구
장동훈(Chang, Dong-Hoon),정진주(Jung, Jin-Ju) 한국교육시설학회 2015 敎育施設 Vol.22 No.3
Under the establishment and operating regulations of school presented only minimum standard for the founding of the school. Therefore, It is intended to suggest the reasonable space standard of the school facility, through comparison & analysis of facility standard in each city and provincial education office. Especially, The facilities standard of Chungcheongbuk-do Office Of Education has been exceeded standardization of architectural space which is proposed the Ministry of Education, and they has made the various learning space reflected creative ideas by designing all of the new school competition since 2000. In order to deal with reacting the changing method of studying like as the examples of Middle & High school in Chungcheongbuk-do, they need to set aside the enough required area for a head of students and the common space which is more than 40% in the total area according to the various learning space, securing the supporting facilities, and break & movement of the students. Moreover, Each of the city and provincial education offices are needed to establish the standardization of proper area for space organization of the planned school throughout upcoming competition.