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남기대(Nam Ki Dae)(南基大),이창섭(Lee Chang Seoup)(李昌燮),박관선(Park Kuan Sun)(朴寬善) 한국유화학회 1991 한국응용과학기술학회지 Vol.8 No.1
The thermodynamics of micellization of a new series of ionic surface-active agents, dimethyl alkyl-2-deoxy-2-epi-inosityi-ammonium chlorides, has been examined. A minimum in the critical micelle concentration versus temperature has been observed at 25℃ It has been found that the standard entropy of micellization is always positive showing that miceliization is governed by the gain in entropy associated with the removal of the monomer from an aqueous environment to the micelle over a 15℃ to 45℃ temperature while governed by enthalpy directed process below 25C˚.
Lee Seung Yeoll(李承烈),Kim Jin Heon(金珍顯),Nam Ki Dae(南基大) 한국유화학회 1989 한국응용과학기술학회지 Vol.6 No.2
A series of four sodium α-sulfo fatty acid allylester oligomers such as sodium α-sulfo lauric acid allylester oligomer, sodium α-sulfo myristic acid allyl ester oligomer, sodium α-sulfo palmitic acid allyl ester oligomer and sodum α-sulfo stearic acid allyl ester oligomer were examined for surface tension, defloculation effect and emulsifying power. Also critical micelle concentration (cmc) was evaluated. Consequently, these sodium allyl α-sulfo aliphatic carboxylate aligomers show o/w type emulsifying agent and dispersion effect in 1g/100ml soulution.
온배수 및 염배수의 근역혼합특성 분석을 통한 방류시스템의 최적설계
남기대(Ki-Dae Nam),이중우(Joong-Woo Lee),김강민(Kang-Min Kim),김기담(Ki-Dam Kim),김필성(Pill-Sung Kim) 한국항해항만학회 2008 한국항해항만학회지 Vol.32 No.8
해양방류시스템을 계획할 때 우선목표는 방류수의 초기희석을 극대화하는 것이다. 이를 효과적으로 달성하기 위해서는 방류수와 주변수의 혼합현상, 특히 초기혼합영역인 근역에 대한 특성분석이 선행되어야 한다. 최근까지 최적의 방류시스템(outfall system) 구현을 위하여 근역(NFR)에서의 온배수 방류에 관한 많은 연구가 이루어지고 있지만 온 배수(heat discharge)와 염배수(brine discharge)를 동시에 방류 할 경우를 고려한 성과물을 찾기는 어려운 실정이다. 이에 본 연구에서는 온수와 영수를 동시에 고려한 방류시스템의 최적석계를 위한 기초자료를 제공하기 위하여 방류수의 거동양상 특히, 근역에서의 혼합특성을 분석하였다. 수치실험은 표면방류, 단일확산관 방류, 다공확산관 방류를 해당해역의 법적 수질 기준에 부합하는지 여부를 주로 평가하였다. 그 결과 표면방류와 단일확산관 방류는 방류형식이 부적절하였고, 다공확산관의 경우 기하학적인 형상에 따라 결과가 조금 상이하였다. When planning outfall system, the first target of design is to maximize initial dilution of discharge effluent. To achieve the target effectively, the characteristics of mixing phenomenon between ambient and discharged water should be analyzed. Especially the analysis at the Near-Field-Region(VFR) as initial dilution zone should be preceded Usually, the initial behavior of effluent through outfall system is rising toward the surface due to mixing with ambient water lor heat discharge and sinking toward the bottom due to the difference of density for brine discharge. After mixed with eddies accompanied by the ambient water, the plumes are showing the same density and internal current pattern by advection and diffusion. Until recently. lots of studies are being carried out for the optimum design of outfall system but it is difficult to find any studies of heat and brine discharge at the same time. Therefore, this study is hoped to provide some basic data for optimum design of outfall system.
양쪽성 이온 계면활성제의 유도체합성 및 계면성에 관한 연구(제1보)
이진희(Lee J H),하정욱(Ha J W),박홍조(Park H J),노윤찬(No Y C),남기대(Nam K D) 한국유화학회 1994 한국응용과학기술학회지 Vol.11 No.1
In order to review industrial application of amphoteric surfactants, new types of hydroxy sulfobetaine, 3-(N, N-dimethyl N-dimethyl-N-alkylammonio)-2-hydroxy-1-propane sulfonate and 3-(N, N-dimethyl N-acylammonio)-2-hydroxy-1-propane sulfonate were prepared by the reaction of quaternized sodium 1-chloro-2-hydroxy-3-propane sulfonate with N, N-dimethyl-N-alkylamine and N, N-dimethyl N-acylamido propylamine that have a straight chain radical of 12, 18 carbon atoms respectively in the presence of alkali catalyst. All the reaction products could be separated by means of column and thin layer chromatography, and the yields of all products ranged in 85-90%, the structure of them could be confirmed from IR and ¹H-NMR spectra.