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- 저자 : 김연주(Kim Yeon Ju) (검색결과 140 건)
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Tialite계 세라믹 안료의 합성 및 유약에서의 발색
김연주,이병하,Kim, Yeon-Ju,Lee, Byung-Ha 한국재료학회 2011 한국재료학회지 Vol.21 No.8
[ $Al_2TiO_5$ ]has a high refractive index and good solubility of the chromophore in the $Al_2TiO_5$ lattice, which allows this structure to be a good candidate for the development of new ceramic pigments. However, pure $Al_2TiO_5$ is well known to decompose on firing at $900{\sim}1100^{\circ}C$. However, this process can be inhibited by the incorporation of certain metal cations into its crystalline lattice. In this study, the synthesis of gray ceramic pigment was performed by doping cobalt on the $Al_2TiO_5$ crystal structure. The $Al_2TiO_5$ was synthesized using $Al_2O_3$ and $TiO_2$, and doped with $Co_3O_4$ as a chromophore material. In order to prevent the thermal decomposition during the cooling procedure, MgO was added to samples by 0.05 mole, 0.1 mole, and 0.15 mole as a stabilizer. The samples were fired at $1500^{\circ}C$ for 2 hours and cooled naturally. The crystal structure, solubility limit, and color of the synthesized pigment were analyzed using XRD, Raman spectroscopy, UV, and UV-vis. $Al_2O_3$ was available for the formation of $CoAl_2O_4$, which should also be considered in order to explain the small amount of this phase detected in the sample with the higher $Co^{2+}$ content (${\geq}$ 0.03 mole). It was found that the solubility limit of $Co^{2+}$ in the $Al_2TiO_5$ crystal was 0.02 mole% through an analysis of Raman spectroscopy. Through the addition of a pigment with 0.02 mole% of $Co^{2+}$ to lime-barium glaze, stabilized gray color pigments with 66.54, -2.35, and 4.68 as CIE-$L^*a^*b^*$ were synthesized.
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김연주,이병하,Kim, Yeon-Ju,Lee, Byung-Ha 한국재료학회 2011 한국재료학회지 Vol.21 No.9
The purpose of this study was to determine the optimal firing condition and composition for $Al_2TiO_5$ crystal, which is suitable for stable coloration in glazes at high temperatures, using $Cr_2O_3$ as chromophore for the synthesis of $Al_2TiO_5$ system pigments. $Al_2TiO_5$ has a high refractive index and good solubility of chromophore in the $Al_2TiO_5$ lattice, making this structure a good candidate for the development of new ceramic pigments. Pigments were synthesized by using $Al_2O_3$ and $TiO_2$ mainly. Various amounts of $Cr_2O_3$ such as 0.01, 0.02, 0.03, 0.04 and 0.05 mole were also added. Each compound was synthesized at $1300^{\circ}C$, $1400^{\circ}C$, and $1500^{\circ}C$ for 2 hours and cooled naturally. The crystal structure, solubility limit, and color of the synthesized pigments were analyzed by XRD, SEM, Raman spectroscopy, UV and UV-vis. The changes in color as the result of applying 6 wt% of the synthesized pigments to lime barium glaze were expressed as CIE-L*a*b* values. A $Cr_2O_3$ 0.03 mole doped $Al_2TiO_5$ brown pigment was successfully synthesize at $1400^{\circ}C$, and the values of CIE-L*a*b* parameters were L* = 44.62, a* = 3.10, and b* = 17.25. In the case of the pigment synthesized at $1500^{\circ}C$, the brown color was obtained at 0.01 mole and 0.02 mole $Cr_2O_3$, and the CIE-L*a*b* values were 55.34, 1.73, 28.64, and 49.39, 0.51, 21.33, respectively. At $1500^{\circ}C$, the maximum limit of solid solution was 0.03 mole $Cr_2O_3$. The glazed sample showed green color, and the values of the CIEL* a*b* parameters were L* = 45.69, a* = -0.98, and b* = 20.38.
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흡연과 위암 발생의 관련성에 관한 지역사회 기반의 코호트 연구
김연주,신애선,곽진,전재관,박수경,강대희,신해림,장성훈,유근영,Kim, Yeon-Ju,Shin, Ae-Sun,Gwack, Jin,Jun, Jae-Kwan,Park, Sue-Kyung,Kang, Dae-Hee,Shin, Hai-Rim,Chang, Soung-Hoon,Yoo, Keun-Young 대한예방의학회 2007 예방의학회지 Vol.40 No.6
Objectives : Gastric cancer is the most common incident cancer in Korea. Although Helicobacter pylori infection is the most important risk factor for the development of gastric cancer, cigarette smoking has also been suggested to play an important role in the development of gastric cancer. The objective of this study is to evaluate the relationship between cigarette smoking and gastric cancer risk in a Korean population. Methods : The study population consisted of 13,785 subjects who had been enrolled in the Korean Multi-Center Career Cohort between 1993 and 2002. As of December 2002, 139 incident gastric cancer cases were ascertained through the Korea Central Cancer Registry and the National Death Certificate Database. Relative risks (RR) and 95% confidence intervals (CI) for gastric cancer were estimated using Cox#s proportional hazard model adjusted for age, education, alcohol drinking status and history of gastritis or ulcer. Results : Significant dose-response relationships were observed between the duration of smoking and the risk of gastric cancer among the male subjects in comparison to non-smokers: men who smoked for 20-39 years had a 2.09-fold (95% CI 1.00-4.38) increase, and those who smoked for more than 40 years had a 3.13-fold (95% CI 1.59-6.17) increase in the risk of gastric cancer ($P_{trend}<0.01$). Conclusions : This study suggests that a longer duration of cigarette smoking may increase the risk of gastric cancer development in a dose-response manner in Korean men. The association between smoking and gastric cancer risk in women should be verified in future studies with a larger number of cases.
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100% 면경편포의 정련, 표백 및 반응성염료 염색성에 관한 연구
김연주,신철봉,조현태,Kim, Yeon-Ju,Sin, Cheol-Bong,Jo, Hyeon-Tae 한국섬유공학회 1981 한국섬유공학회지 Vol.18 No.3
Effects of pH and temperature on shrinkage of grey knits (slip) and effects of scouring renditions on shrinkage, reflectance, handle and reactive dyeing Properties of loon cotton warp knits were studied. The results are as follows. In solution of room temperature and pH 71-13 the maximum area shrinkage was about 20%, pH has no effect on area shrinkage but on linear shrinkage. Three dimensional the loop which caused a knit to shrink was caused by the twist of yarn. Temperature has no effect on area shrinkage of grey knits. In mixed solution of sodium hydroxide and soda ash, the decrease of concentration ratio of soda ash made the reflectance decrease and the softness increase. Equilibrium adsorption was decreased as the pH of dye bath increased but the maximum fixation was obtained at pH 10. Scouring conditions have some effect on the rate of adsorption but a few effect on the rate of fixation.
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