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아세토니트릴 용매 중에서 Copper-1,5,9,13-Tetrathiacyclohexadecane 착물의 전기화학적 거동과 그 분석적 응용
徐戊龍,李富永,崔明子,裵俊雄,朴泰明 慶尙大學校 기초과학연구소 1992 基礎科學硏究所報 Vol.8 No.-
비수용매인 아세토니트릴 중에서 Cu(Ⅱ)dhk 1,5,9,13-tetrathiacyclohexadecane[16-ane-S_4]의 착물에 대한 전기화학적 거동으로서 직류폴라로그램과 미분펄스폴라로그램으로부터 환원전류의 유형과 가역성을 조사하고, 이들 화합물의 분석적 응용으로서 수용액에 있는 Cu(Ⅱ) 이온을 염석추출법으로 정량하였다. 또한 아세토니트릴 용매 중에서 착물의 안정도상수를 구하고, 분석적 응용으로 수용액 중의 Cu(Ⅱ)를 염석추출법으로 정량하기 위하여 추출 조건 곧 킬레이트와 염석제의 효과, pH 범위를 구하고 또한 Cu(Ⅱ)이온을 정량하는데 있어서의 검량성과 공존이온 효과를 조사하였다. 실험결과로부터 환원 과정은 비가역적이었으며 환원전류는 확산지배적임을 알았다. 또한 아세토닐트릴 용매 중에서 착물의 log K_f 값은 3.51이었으며 Cu(Ⅱ) 이온을 정량하는데 있어서 공존하는 이온의 영향을 별로 받지 않아 선택성이 좋았으며 본 실험방법에 의한 정량한계는 60ppb 이었다. The electrochemical behaviors and analytical application of copper-1,5,9,13-tetrathiacyc-lohexadecane[16-ane-S_4] complex in acetonitrile(AN) solution have been investigated by the use of Dc polarogaphy and differential pulse polarography. Thus the formation constant of copper complex was 10^3.51. Copper (Ⅱ) ion was found to form complex of 1-to-1 composition with [16-ane-S_4]. In addition, reduction step was irreversible and the reduction current was diffusin controlled. And the effect of concentration of the salting-out reagent and chelating agent and pH of aqueous phase on the determination of copper(Ⅱ) was investigated and diverse ion effect was discussed. By salting-out extraction technique, we can be determined until the concentration of cooper (Ⅱ) of 60 ppb.
GaN light-emitting diodes on glass substrates with enhanced electroluminescence
Choi, Jun Hee,Ahn, Ho Young,Lee, Yun Sung,Park, Kyungwoo,Kim, Tae-Ho,Cho, Kyung Sang,Baik, Chan Wook,Kim, Sun Il,Yoo, Hyobin,Lee, Eun Hong,Choi, Byoung Lyong,Kim, Sung-Dae,Kim, Young-Woon,Kim, Miyoung The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.43
<P>We report the enhanced electroluminescence (EL) of GaN light-emitting diodes (LEDs) on glass substrates by controlling GaN crystal morphology, crystallinity, and device fabrication. Depending on the degree of epitaxy, we studied three different GaN morphologies; randomly oriented GaN polycrystals, nearly single-crystalline pyramid arrays, and fully single-crystalline pyramid arrays, which were fabricated by controlling the epitaxial relationship with the substrates. At proper growth temperature, GaN crystallinity was improved with increasing GaN crystal size irrespective of the GaN crystallographic orientation, as determined by spatially resolved cathodoluminescent spectroscopy. All the different GaN morphologies were further fabricated into LEDs to investigate their EL characteristics. The optimized GaN LEDs on glass composed of the nearly single-crystalline GaN pyramid arrays exhibited excellent microscopic EL uniformity and luminance values of about 2700 and 1150 cd m<SUP>−2</SUP> at peak wavelengths of 537 and 480 nm, respectively.</P> <P>Graphic Abstract</P><P>GaN LEDs on glass exhibiting excellent microscopic and macroscopic uniformities by optimizing GaN pyramid crystallinity and related process. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm34405j'> </P>
Full-colour quantum dot displays fabricated by transfer printing
Kim, Tae-Ho,Cho, Kyung-Sang,Lee, Eun Kyung,Lee, Sang Jin,Chae, Jungseok,Kim, Jung Woo,Kim, Do Hwan,Kwon, Jang-Yeon,Amaratunga, Gehan,Lee, Sang Yoon,Choi, Byoung Lyong,Kuk, Young,Kim, Jong Min,Kim, Kin Springer Science and Business Media LLC 2011 Nature photonics Vol.5 No.3
Kim, Tae Ho,Jung, Jong Hwa,Choi, Jung Kyu,Choi, Yun Hee,Lee, Soo Jin,Seo, Moo Lyong,Kim, Jong Seung The Chemical Society of Japan 2007 Chemistry letters Vol.36 No.3
<P>Functionalized silica nanotube (FSNT) possessing a calix[4]arene moiety as a fluorescent receptor is fabricated by sol–gel reaction. The FSNT suspension in water selectively adsorbs 98% of Pb<SUP>2+</SUP> over other metal ions (Li<SUP>+</SUP>, Na<SUP>+</SUP>, K<SUP>+</SUP>, Cs<SUP>+</SUP>, Mg<SUP>2+</SUP>, Ca<SUP>2+</SUP>, Ba<SUP>2+</SUP>, Zn<SUP>2+</SUP>, and Ag<SUP>+</SUP>) and shows quenched fluorescence emission in both pyrene monomer and excimer bands.</P>
박우룡,모양우,최주호,유영태 順天大學校 1992 論文集 Vol.11 No.1
The characteristic of the pressure distributions are studied theoretically and experimentally for the laminar steady flow and the laminar pulsating flow generated by the butterfly valve in the coiled pipes with the curvature ratios of 7 and 30. The pressure gredient ratios affact with Wormersley numbers, Dean numbers, velocity amplitude ratios and time averaged Reynolds numbers. The pressure gredient ratios of oscillatory components increase according to increasing the Wormersley number and the velocity amplitude ratio.
아세토니트릴 용매 중에서 Copper-1,5,9,13-Tetrathiacyclohexadecane착물의 전기화학적 거동과 그 분석적 응용
서무룡,이부영,최명자,배준웅,박태명,Moo-Lyong Seo,Bu-Yong Lee,Myung-Ja Choi,Bae Jun Ung,Park Tae Myeong 대한화학회 1992 대한화학회지 Vol.36 No.3
비수용매인 아세토니트릴 중에서 Cu(Ⅱ)와 1,5,9,13-tetrathiacyclohexadecane[16-ane-$S_4$]의 착물에 대한 전기화학적 거동으로서 직류폴라로그램과 미분펄스폴라로그램으로부터 환원전류의 유형과 가역성을 조사하고, 이들 화합물의 분석적 응용으로서 수용액에 있는 Cu(Ⅱ) 이온을 염석추출법으로 정량하였다. 또한 아세토니트릴 용매 중에서 착물의 안정도 상수를 구하고, 분석적 응용으로 수용액 중의 Cu(Ⅱ)를 염석추출법으로 정량하기 위하여 추출조건, 곧 킬레이트와 염석제의 효과, pH 범위를 구하고 또한 Cu(Ⅱ) 이온을 정량하는데 있어서의 검량성과 공존이온 효과를 조사하였다. 실험결과로부터 환원 과정은 비가역적이었으며 환원전류는 확산지배적임을 알았다. 또한 아세토닐트릴 용매 중에서 착물의 log $K_f$의 값은 3.51이었으며 Cu(Ⅱ) 이온을 정량하는데 있어 공존하는 이온의 영향을 별로 받지 않아 선택성이 좋았으며 본 실험방법에 의한 정량한계는 60ppb 이었다. The electrochemical behaviors and analytical application of copper-1,5,9,13-tetrathiacyclohexadecane[16-ane-$S_4$] complex in acetonitrile(AN) solution have been investigated by the use of DC polarography and differential pulse polarography. Thus the formation constant of copper complex was $10^{3.51}$. Copper (Ⅱ) ion was found to form complex of 1-to-1 composition with [16-ane-$S_4$]. In addition, reduction step was irreversible and the reduction current was diffusion controlled. And the effect of concentration of the salting-out reagent and chelating agent and pH of aqueous phase on the determination of copper (Ⅱ) was investigated and diverse ion effect was discussed. By salting-out extraction technique, we can be determined until the concentration of copper (Ⅱ) of 60 ppb.