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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˚.
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.
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.
당지질계 미생물 계면활성제에 관한 연구 ( 제1보 ) Pseudomonas sp . 13에 의한 Rhamnolipid 의 생성에 있어 배지의 최적효과
이선주,남기대 ( Sun Ju Lee,Ki Dae Nam ) 한국공업화학회 1993 공업화학 Vol.4 No.1
N/A Recently we are interested in the biosurfactant. Biosurfactant have a low toxcity and easily biodegradable compound. Pseudomonas sp. 13 was isolated from soil. This microorganism produced biosurfactant that consists of glycolipid R-1 and R-2. A time course study of fermentation indicated that the appearance of glycolipid in the fermentation broth the commencement of the stationary phase with the respect to biomass. The effect of variation of the media components such as amount of glucose, nitrogen, phosphate and metal ions has been investigated The following values found to be optimum for biosurfactant production (glucose, 20 g/ℓ; carbon to nitrogen ratio, 40; carbon to phosphate, 18; FeSO₄·7H₂O 20 ㎎/ℓ).
이선주,남기대 ( S . J . Lee,K . D . Nam ) 한국공업화학회 1993 공업화학 Vol.4 No.1
Many different types of synthetic surfactant are being used, but it is important to devolop for a broad range of purposes in a large variety of different application. Biosurfactant are important because the present a much broader range of surfactant types and properties than the available synthetic surfactant. futhermore, they are easily biodegradab1e and low toxicity, which reduce the potential of pollution. This article discusses the structure and properties of the glycolipid biosurfactants, their production and isolation from fermentation broths, and their potential applications.
당류를 친수기로 한 비이온성 계면활성제의 점탄성 ( 제1보 ) - 슈크로오스 라우레이트 / 물 계에서의 유동성 -
이진희,남기대 ( Jin Hee Lee,Ki Dae Nam ) 한국공업화학회 1995 공업화학 Vol.6 No.1
당류를 친수기로 한 슈크로오스 라우레이트에 대한 수용액계에서의 유동성을 농도에 따라 조사하였다. 미셀 영역에서 액정영역에 이르기까지 계면활성제의 농도를 변화시키면서 온도 55℃에서 측정하였다. 1∼3wt%농도까지는 전단속도에 따라 정상상태에서의 겉보기 점도는 멱급수적으로 감소하였다. 5wt% 이상의 농도에서 유동곡선은 50∼100s^(-1)의 전단속도 전후에서 겉보기 점도의 변곡점이 나타났고 겉보기 점도를 캐로우 모델(Carreau model)에 적용하였다. 편광학적 방법에 의해 미셀영역, 미셀영역 내 액정상의 분산, 그리고 액정영역을 확인하였다. 미셀 영역은 약 20wt% 농도 범위였다. 또한 20∼50wt% 농도에서는 등방성 미셀에서 헥사고날형 액정영역까지의 혼합 분산영역임을 알았고, 약 55∼65wt% 농도에서는 라멜라 액정상이 형성되어 있음을 확인하였다. 변형스위프 실험에 의해 20wt% 농도까지 선형점탄성을 나타내었으며 그 이상의 농도에서는 비선형적 점탄성을 나타내었다. Flow behavior for aqueous solution of sucrose laurate was investigated at given concentrations. Ranging from micellar region up to the occurrence of liquid crystal phase with the variation of concentration were measured at given 55℃. As a result, systems from 1wt% up to 3wt% sucrose laurate exhibited a power law decrease in the steady-state apparent viscosity with shear rate. Flow curves also showed bent at about 50∼100s^(-1) shear rate above 5wt% concentration, so that the apparent viscosity fitted the Carreau model. Existence of three composition ranges is confirmed by polarized microscopy. As surfactant concentration rises, an increasingly hard micellar structure extended up to 20wt% concentration, and there showed some hexagonal liquid crystal dispersion in an isotropic micellar solution between about 20wt% and 50wt% system Oily-streaks structure in liquid crystal was formed at 55∼65wt% sucrose laurate. From the sweep measurement, linear viscoelastic properties were exhibited up to 20wt% concentration, and there showed nonlinear viscoelastic curves above 20wt%.