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Tetramethylammonium Bromide를 이용한 방향족 술폰산들의 액체크로마토그래피
오해범,Oh, Hae-Beom 대한화학회 1993 대한화학회지 Vol.37 No.9
$C_{18}$ 칼럼을 정지상으로 사용한 역상 액체크로마토그래피에서 수소성이 약한 tetramethylammonium bromide(TMAB)를 반대이온으로 사용하여 방향족 술폰산들의 머무름기구를 조사해 본 결과, 이온-쌍 모델이 우세하였다. 분석물질들의 용량인자는 반대이온의 종류와 농도, 메탄올과 co-anion의 농도, 분석물질속에 있는 작용기의 종류와 위치 및 이동상의 pH 등의 영향을 받았다. 최적 조건하에서 분석물질들의 혼합물을 효과적으로 분리할 수 있었다. Ion-pair model was predominated over ion-interaction model in the retention mechanism of analytes when tetramethylammonium bromide (TMAB) was used as a counter-ion in the investigation of aromatic sulfonic acids on the reversed-phase liquid chromatography by $C_{18}$ column as a stationary phase. The capacity factors of analytes were influenced by the type and concentration of counter-ions, concentrations of methanol and co-anion, types and position of functional group, and the pH mobile phase. Components of analyte mixture could be separated under the optimum conditions by this method.
역상계에서 방향족 카르복시산류의 이온-쌍 크로마토그래피
오해범,강삼우,이승석,Hae-Beom Oh,Sam-Woo Kang,Seung-Seok Lee 대한화학회 1986 대한화학회지 Vol.30 No.3
Dodecyltrimethylammonium bromide (DTAB) was examined as a counter-ion in the investigation of capacity factor and separation of aromatic carboxylic acids on alkyl-modified silica (ODS) column as a stationary phase by ion-pair chromatography on reversed-phase system. The capacity factor of samples was influenced by the several factors such as a concentration of counter-ion as well as kinds and concentration of electrolyte, concentration of methanol in mobile phase and kinds and position of functional group in sample molecule. Some mixtures of samples were able to be separated under optimum condition. 알킬 처리된 실리카(ODS)칼럼을 정지상으로하여 역상에서의 이온-쌍 크로마토그래피 법으로 방향족 카르복시산들의 크기 인자를 조사하고 분리하는데 반대 이온으로 브롬화 도데실트리메틸암모늄(DTAB)을 사용하였다. 시료의 크기 인자는 반대 이온의 농도, 메탄올의 농도, 전해질의 종류 및 농도, 시료 분자에 붙어 있는 다른 작용기의 종류 및 위치등에 따라 영향을 받았다. 최적 조건하에서 몇 가지 혼합 시료를 분리할 수 있었다.
비극성 합성수지를 이용한 방향족 화합물의 흡착에 관한 연구
오해범,정순량,홍성완 又石大學校 1984 論文集 Vol.6 No.-
This study describes liquid-solid extraction for the adsorption of organic compounds from aqueous solution by using XAD-2 resin. The adsorption behaviors of organic compounds on XAD-2 resin have been investigated. As a result, the following conclution have been obtained. 1. The adsorption behaviors of aromatic compounds on Amberlite XAD-2 are caused by van der waals attraction between the organic molecule and XAD-2 resin matrix. 2. The adsorption on XAD-2 are influenced by the following factors: 1) Shaking time, 2) Concentration of organic solvent added, 3) Polarity and position of substituted groups in an organic molecule, 4) Ionization constant of organic molecule, 5) Molecular weight of organic sample, 6) pH value of medium.
오해범,정순량,홍성완 우석대학교 부설 기초과학연구소 1996 기초과학연구소 논문집 Vol.1 No.-
C_18칼럼을 정지상으로 한 방향족카르복시산들의 역상액체크로마토그래피에서 teramethylmmonium bromide(TMAB)를 반대이온으로 사용하였을 때 반응메카니즘은 이온-쌍 모델이 우세하였다. 시료들의 용량인자값들은 반대이온의 종류와 농도, 이동상에 들어있는 메탄올과 공존음이온의 농도, pH에 많은 영향을 받았으며 시료에 치환되어 있는 작용기의 종류와 위치에 따라서도 영향을 받았다. 이 결과를 토대로 최적 조건하에서 몇가지 시료의 혼합물들을 효과적으로 분리할 수 있었다. Ion-pair model was predominated over ion-interaction model in the retention mechanism of analytes when tetramethylammonium bromide(TMAB) was used as a counter-ion in the investigation of aromatic polycarboxylic acids on the reversed-phase liquid chromatography by C_18 column as a stationary phase. The capacity factors of analytes were influnced by the type and concertation of counter-ions, concertrations of methanol and co-anion, type and position of functional group, and the PH in mobile phase. Components of analyte mixtuue could be separated under the optimum conditions by this method.
이온쌍 크로마토그래피에 의한 벤젠슬폰산과 그 유도체들의 분리
吳海範 又石大學校 1985 論文集 Vol.7 No.-
Dodecyltrimethylammonium bromide (DTAB) was examined as a counter-ion in the separation of aromatic sulfonic acids on alkylmodified silica (ODS) column by reversed-phase ion-pair chromatography. The capacity factor of acids was investigated and separation was attempted. The capacity factor of samples was influenced by the several factors such as a concentration of counter-ion, concentration of methanol, kinds and concentration of electrolyte in mobile phase as well as kind and position of functional group in samples, Some mixtures of samples were able to be separated under optimum condition.
간접 분광광도 검출법을 이용한 비발색 음이온들의 액체 크로마토그래피
吳海範,郭皇來,李承錫 又石大學校 1991 論文集 Vol.13 No.-
The separation of non-chromophoric anions were studied on the ion-cxchange chromatography method by HPLC.a-Naphthalenesulfonic acid(α-NS) was used as a visualization agent as well as ion-exchange agent in this experiments by indirect photometric detection method. Also, several factors affecting to the retention time and the separations of samples were investigated. And, the following results were obtained in this study. 1. These non-chromophoric anions were detected by the indirect photometric detection method at the 285nm for α-NS 2. The capacity factor of samples was influenced by the concentration of α-NS and the strength of organic solvent. 3. Some mixtures of samples were able to separated with good resolution and relatively high sensitivity providing detection limit of 0.1㎍ under optimum condition.
The Chemical Reactivity of Benzpyrene Calculated by the Frontier Electron and Perturbation Methods
Oh, Hae-Beom,Hong, Sung-Wan 又石大學校 1982 論文集 Vol.4 No.-
콘쥬게이트된 benzpyrene에 대한 전자 상태와 반응성을 조사하기 위하여 Hu¨ckel 분자궤도함수법을 이용하여 프론티어 궤도의 에너지 상태 및 Superdelocalizability 같은 반응성 차수 및 결합자수를 계산하였다. 화학적 반응성은 최고 점유분자 궤도와 최저 비점유 분자궤도의 차이 ΔEπ 값을 각각 비교함으로써 여기되기 쉬운 상태에 있으며, Superdelocaliability 값은 S_r(E)>S_r(R)>S_r(N) 순으로 나타났으며 친선지적 반응이 지배적으로 나타낼 수 있음을 알았다.
미셀-알콜수용액에서 Nitrobenzyl chloride의 전기화학적 환원
金日光,오해범 圓光大學校 基礎自然科學硏究所 1983 基礎科學硏究誌 Vol.2 No.1
The electrochemical reduction of nitrobenzyl chlorides in micelle-ethanol solution has been examined by polarography. The polarographic half-wave potential of nitrobenzy1 chlorides shown to be more negative shift in the anionic micelle(NaLS). o, p-nitrobenzy1 chlorides are initially an one-electron process which give the corresponding anion radical and the anion radical is rapidly decomposed to give the neutral radical. Those neutral radical dimerises as a major product although some o,p-nitrotoluene is also produced by hydrogen atom abstraction from the solvent. But m-nitrobenzy1 radical produced only m-nitrotoluene because of its steric effect.