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강용식,김원덕,주미숙 중앙대학교 기술과학연구소 1989 기술과학연구소 논문집 Vol.19 No.-
The silylation of sodium silicate, Water glass, for the preparation of new orqanic matters has been studied through silicic acid from commercial sodium silicate and organic silane. Sodium silicate was acidified by addition of diluted sulfuric acid carefully under prevention of gelation, and prepared silicic acid solution was extracted by tetrahydrofurane. finally trimethylsilylates was prepared by reaction of the silici acid and trimetylchlorosilane. The authers have investigated properties of the silylates through IR, ¹HNMR spectra, X-Ray diffraction, thermal analysis and gel chromatography. And it was clear that the molecular weight of the trimethylpolysiloxane 1000 to 1500, the decomposition temperature 390 to 410℃ and the melting point 80 to 150℃.
Transport Coefficients across Charged Mosaic Membrane
Yang, Wong-Kang Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.5
In previous studies, charged mosaic membranes having two different fixed charges in the membrane matrix indicated unique transport behavior such as preferential material transport. In this study, the composite charged mosaic membrane endurable to mechanical pressure in practical application was investigated from the same aspect of solute and solvent transport as before. Lp and ${\omega}$ estimated by taking account of active layer thickness were satisfactorily consistent with those in mosaic membrane without reinforcement. On the other hand, the reflection coefficient s indicated the negative value that suggests preferential material transport.
A Species of the Genus Parapyxidicerus Sawada, 1964 (Coleoptera: Staphylinidae) new to Korea
Ji-Wong Kang,Sun-Jae Park,A-Young Kim,Jong-Seok Park 한국응용곤충학회 2020 한국응용곤충학회지 Vol.59 No.4
개미사돈아과의 미기록종인 멧개미사돈(Parapyxidicerus carinatus Sawada, 1964)(신칭)을 한국에서 처음으로 보고하며 이들이 속한 한국 미기록족 Bythinoplectini에 대해 함께 보고한다. 털어잡기 방법으로 세 개체의 표본이 경기와 강원도의 물가에서 확보되었다. 정확한 동정을 위해 외형과 진단형질의 사진 그리고 분포지도를 함께 제공한다. The pselaphine beetle, tribe Bythinoplectini is recorded from Korea for the first time, represented by a single species, Parapyxidicerus carinatus Sawada, 1964 previously only known from Japan. Three specimens were collected in northern part of South Korea (Gyeonggi and Gangwon Provinces) by sifting leaf litter near stream. Illustrations of a habitus, diagnostic characteristics of the tribe, genus and species, and distributional map are provided.
Diffusion Coefficients and Membrane Potential within Carrier Membrane by Reverse Transport System
Yang, Wong-Kang,Jeong, Sung-Hyun,Lee, Won-Chul The Membrane Society of Korea 2002 Korean Membrane Journal Vol.4 No.1
The diffusion coefficients of ions in the reverse transport system using the carrier mediated membrane were estimated from the diffusional membrane permeabilities and the ion activity in membrane system. In the aqueous alkali metal ions-membrane system diffusional flux of alkali metal ions driven by coupled proton was analyzed. The aqueous phase I contained NaOH solution and the aqueous phase II also contained NaCl and HCl mixed solution. The concentration of Na ions of both phases were $10^{0},\;10^{-1},\;10^{-2},\;5{\times}10^{-1}\;and\;5{\times}10^{-2}\;mol{\cdot}dm^{-3}$ and the concentration of HCI in aqueous phase II was always kept at $1{\times}10^{-1}\;mol{\cdot}dm^{-3}$. Moreover, the carrier concentration in liquid membrane was $10^{-2}\;mol{\cdot}dm^{-3}$. The results indicated that the diffusion coefficients depend strongly on the concentration of both phases electrolyte solution equilibriated with the membrane. The points were interpreted in terms of the energy barrier theory. Furthermore, eliminating the potential terms from the membrane equation was derived.