http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
팔라디움-은합금의 반복주조시 도재와 금속간의 화학적 결합에 관한 실험적 연구
김태균,이선형,양재호,정헌영,Kim, Tae-Kyun,Lee, Sun-Hyung,Yang, Jae-Ho,Chong, Hun-Young 대한치과보철학회 1989 대한치과보철학회지 Vol.27 No.1
The purpose of this study was to evaluate the chemical bond strength of successively recast Pd-Ag ceramic alloys with porcelain and to investigate changes of quantity of trace elements at the metal-porcelain interface. Porcelain was fired as usual manner on the each successively recast specimen. Rectangular planar shear test was performed and bond strength was measured by Instron universal testing machine. Diffusion of trace elements at the each interface was observed by ESCA (Electron Spectroscopy for Chemical Analysis). The obtained results were as follows : 1. Chemical bond strength was significantly decreased after second recasting. But in case of first recasting, there was no significant decrease of bond strength statistically (p<0.05). 2. Bond strength was not significantly decreased in each generation, when fifty percents new alloy was added (p<0.05). 3. Ag, Sn and In were observed at the porcelain interface. But Pd was not observed. 4. The quantity of Ag, In ions were progressively increased at the metal-porcelain interface as the casting was repeated. Silver ion was most significantly increased.
겔화제의 농도와 온도 변화에 따른 키토산 졸의 겔화 특성
김태영,오찬권,문희,양재호 ( Tae Young Kim,Chan Kwon Oh,Hee Moon,Jai Ho Yang ) 한국공업화학회 1995 공업화학 Vol.6 No.4
키틴을 알칼리 수용액으로 처리하여 제조한 키토산을 2wt% 초산수용액에 용해시킨 키토산 colloid 용액의 겔화 특성을 겔화제의 농도와 온도 그리고 키토산 용액의 농도 변화에 대해 조사하였다. 실험에 사용한 키토산의 평균 분자량은 약 5.17×10^5이며, 탈아세틸화도는 약 85%였다. 겔화제로 NaOH를 사용했으며 겔화 현상을 설명하기 위하여 간단한 확산모델을 이용하였다. 겔화제의 농도와 온도 그리고 키토산 용액의 농도가 증가함에 따라 키토산겔 내부에서 겔화제의 확산계수는 증가했다. Gelation of colloidal chitosan solution was investigated experimentally. The chitosan solution was prepared by dissolving chitosan converted from alkali-treated chitin into 2wt% acetic acid aqueous solution. Characteristics of chitosan gelation was investigated in terms of concentration variation of gelation agent, temperature and concentration of the chitosan solution. The average molecular weight and the degree of deacetylation of the chitosan used here were determined to be 5.17×10^5 and 85%, respectively. Sodium hydroxide solutions were used as gelation agents. A simple diffusion model was applied to study the gelation rate of the chitosan solution. The diffusion coefficient of the gelation agent in the chitosan gel increased with increasing its concentration of the casting solution, temperature and concentration of the chitosan solution.
김태영,문희,양재호 全南大學校 觸媒硏究所 1998 觸媒硏究 論文集 Vol.20 No.-
Chitosan are made by treating chitin with 2N NaOH solution. The chitosan solution was prepared by dissolving chitosan into 2wt% aqueous acetic acid solution and th chitosan beads were made by sol-gel method. The average molecular weight and the degree of deacetylation of the chitosan used here were determined to be ?? and 85%, respectively. Chitosan beads were highly porous which was confirmed by SEM photography and BET. Adsorption equilibrium of ?? porous chitosan beads could be represented by Sips equation. The diffusion of cadmium ions in the chitosan beads could be explained by pore and surface diffusion mechanisms. Adsorption dynamics of ?? in fixed-bed could be simulated by LDFA (linear driving force approximation)
키토산과 활성탄이 혼합된 CAC 비드를 이용한 유기물과 무기물의 흡착
김미희,허준섭,김태영,문희,양재호 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.1
평균분자량이 4.5×10 exp(5), 탈아세틸화도가 91%인 키토산과 PAC(powder activated-carbon)를 혼합하여 이를 2wt% 초산수용액에 용해시킨 후 CAC(mixed chitosan with powder activated-carbon) Beads를 제조하였다. 유기물과 무기물을 동시에 제거하기 위하여 CAC Beads의 흡착 효율에 대하여 조사하였다. CAC Beads에 의한 구리와 페놀의 흡착평형은 Sips식으로 잘 묘사할 수 있었으며, Beads 내부에서의 확산과정은 세공확산모델로 설명할 수 있었다. 결과적으로, CAC Beads는 폐수로부터 유기물과 무기물을 동시에 제거할 수 있는 새로운 흡착제로 사용될 수 있을 것이다. Simultaneous adsorption of phenol and copper ions on CAC beads were investigated. The chitosan solution was prepared by dissolving chitosan power and PAC into 2 wt% aqueous acetic acid solution. Then CAC beads were made by this chitosan solution. The average molecular weight and the degree of deacetylation of the chitosan used here were determined to be 4.5×10 exp(5) and 91%, respectively. Adsorption equilibrium of copper ions and phenol on CAC beads could be represented by Sips equation. The diffusion mechanism could be explained by pore diffusion model. Consequently, CAC beads could be used as a adsorbent for simultaneous removal and separation of phenol and copper ions from aqueous effluents.