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RISS 인기검색어
- 검색키워드
- 저자 : Fuan Yan (검색결과 3 건)
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Congliang, Zhang,Yan, Wang,Fuan, Wang Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.7
A shake-flask method was used to determine the n-octanol/water partition coefficients of sulfamethazine, sulfadimethoxine, sulfamethoxydiazine, sulfamonomethoxine, sulfamethoxazole, sulfaquinoxaline and sulfachloropyrazine from (298.15 to 333.15) K. The results showed that the n-octanol/water partition coefficient of each sulfonamide decreased with the increase of temperature. Based on the fluid phase equilibrium theory, the thermodynamic relationship of n-octanol/water partition coefficient depending on the temperature is proposed, and the changes of enthalpy, entropy, and the Gibbs free energy function for sulfonamides partitioning in n-octanol/ water are determined, respectively. Sulfonamides molecules partitioning in n-octanol/water is mainly an enthalpy driving process, during which the order degrees of system increased. The temperature effect coefficient of n-octanol/water partition coefficient is discussed. The results show that its magnitude is the same as that of values in the literature.
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Yong Zhou,Fuan Yan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
The purpose of this work was to reveal the initiation mechanism of grain boundary dissolution (GBD) forcarbon steels in acidic electrolytes containing NO2 – . For Q235 carbon steel in a HNO3-NaNO2 solution withpH 4, the electrochemical methods of potentiodynamic polarization and scanning Kelvin probe forcemicroscope (SKPFM) were applied to explore electrochemical behavior, and the surface methods of scanningelectron microscope (SEM), electron back-scatter diffraction (EBSD) and scanning tunneling microscope(STM) were applied to explore surface microstructure and composition. Q235 carbon steelpresented the electrochemical behavior of activation-passivation-transpassivation in pH 4 HNO3-NaNO2 solution, GBD occurred on steel surface during anodic polarization. GBD initiation, which showeda selective characteristic, was found at the grain boundaries of relatively high Si and Mn contents (highSi-Mn grain boundary) when Q235 carbon steel was polarized to active–passive transition potential. Thegrain boundary segregations of Si and Mn played a critical role in the initiation of GBD, and an electrochemicalmicro-couple (EMC) mechanism based on the Si and Mn segregations was proposed to revealGBD initiation. EMC potential difference between high Si-Mn grain boundary and grain interior wasgreater than that between low Si-Mn grain boundary and grain interior, resulting in that GBD initiatedat high Si-Mn grain boundary. The detailed EMC mechanism of GBD initiation was discussed in this work.
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Zhang Congliang*,Wang Yan,Wang Fuan 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.7
A shake-flask method was used to determine the n-octanol/water partition coefficients of sulfamethazine, sulfadimethoxine, sulfamethoxydiazine, sulfamonomethoxine, sulfamethoxazole, sulfaquinoxaline and sulfachloropyrazine from (298.15 to 333.15) K. The results showed that the n-octanol/water partition coefficient of each sulfonamide decreased with the increase of temperature. Based on the fluid phase equilibrium theory, the thermodynamic relationship of n-octanol/water partition coefficient depending on the temperature is proposed, and the changes of enthalpy, entropy, and the Gibbs free energy function for sulfonamides partitioning in n-octanol/water are determined, respectively. Sulfonamides molecules partitioning in n-octanol/water is mainly an enthalpy driving process, during which the order degrees of system increased. The temperature effect coefficient of n-octanol/water partition coefficient is discussed. The results show that its magnitude is the same as that of values in the literature.
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