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THE RATE OF NUCLEI FORMATION OF ZSM -5 ZEOLITE
Seo, Gon,Chung, Kyeong Hwan,Kim, Keun Shik 한국화학공학회 1992 Korean Journal of Chemical Engineering Vol.9 No.3
The crystallization processes of ZSM-5 zeolite from mixture of colloid silica, sodium aluminate, sodium hydroxide and tetrapropyl ammonium bromide at 150-195℃ were studied. As the temperature increases, crystallization time decreases, crystal size becomes smaller, and the distribution becomes narrower. The rate of nuclei formation is deduced from the size distribution of final product under the assumption that crystal is growing at constant rate from the nuclei formed during the induction period. The rate of nuclei formation is also accelerated with temperature increase. When the rate constants of the crystal growth axe 0.012-0.170 ㎛·min^(-1) at 150-195℃, the crystallization curves can be simulated with the rate equation of nuclei formation deduced from the crystal size distribution of the final product.
The prevalence of onychomycosis in patient with neurologic damage
( Seo Mi Gon Jeong ),( Chang Il Kwon ),( Young Bin Shin ),( Yun Sun Moon ),( Eui Chang Jung ),( Chi Yeon Kim ),( Tae Jin Yoon ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: The role of a number of inherited, acquired and environmental factors has been identified to increase the risk of onychomycosis. Objectives: In this study, we attempt to evaluate the frequency of onychomycosis and etiological factors in patients with neurologic impairment. Methods: We investigated the distribution of gender, age, clinical features and duration of disease for all patients. The studied group (n = 242) included 140 patients with nail abnormalities raising a clinical suspicion of nail onychomycosis (with no history of neurologic impairment) and 102 neurosurgery inpatients. The control group included 80 patients with clinically normal nails. The patients were classified into one of the five diagnostic subgroups with standard photographs as reference. The presence of fungi was confirmed in direct microscopy and culture. Results: The prevalence of onychomycosis did not differ significantly between inpatients with neurologic impair and patients with nail alterations. The characteristics of isolated fungal species is yeast (Candida albicans), dermatophyte (Trichophyton rubrum), and molds (Scopulariopsis brevicaulis). Conclusion: This study shows that significantly higher incidence of onychomycosis was observed in neurologic impair patients as well as in patients with clinically abnormal nails compared to controls. The studied group supports the hypothesis that the nuerologic damange is a risk factor for onychomycosis.
Gon Seo,김미영,Ki Won Lee,박정현,신채호,이재영 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
The catalytic decomposition of N2O was investigated over Fe-BEA zeolites treated with various methods such as reduction, steaming and dissolution with potassium nitrate and nitric acid solutions in order to deduce the essential components of the active sites for the decomposition. The iron species were characterized by XPS, XANES, ESR,NO adsorption, and linear sweep voltammetry. The reduction-treated Fe-BEA zeolite with the large amounts of Fe(II)and Fe(III) species showed the highest activity. On the contrary, the dissolution treatment with the potassium nitrate solution seriously deteriorated the catalytic activity of the Fe-BEA zeolite by agglomerating iron oxide clusters and interaction between iron and potassium atoms. The catalytic roles of Fe(II)/Fe(III) species and the negative effect of potassium on the catalytic activity of the Fe-BEA zeolites were discussed.