http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
피부 미용에 있어서 자외선 차단제의 개발 및 유효 안전성
김상춘,남기대,이향우 ( S . C . Kim,K . D . Nam,H . W . Lee ) 한국유화학회 1995 한국응용과학기술학회지 Vol.12 No.2
The ultraviolet blocking agents used to skineare are largely classified ultraviolet scattering agent and ultraviolet absorbent agents. There are UVC, UVB, and UBA in ultraviolet ray(UV) showing shorter wavelength than visible light. Both visible light and UVA give rise to 1st dark-skinned phenomena. On exposure of the skin to UV, phenomena of skin variation are termed sunburn or suntan. There are chronic and acute adverse reactions in skin response to UV. The latter is caused by UVB, which has mainly effects on the skin. But lately due to destruction of ozone layer, UVA has more serious irritation on the skin than UVB. In this paper spectrometric properties of UV absorbent agents such as PABA, octyl-PABA, Urocanic acid, and 2-hydroxy-4-methoxy benzophenone in vitro have been investigate. As results, it was found that the three fomer were more suitable than the last. UV scattering measurements on the sample used inorganic pigments showed that pigments containing titanium dioxide had a better scattering effects than the inorganic pigments such as Fe_2O_3, Al_2O_3, etc.
노윤찬,남기대 ( Y . C . Ro,K . D . Nam ) 한국공업화학회 1994 공업화학 Vol.5 No.5
Imidazoline compounds have been developed in many industrial fields(eg. cosmetic, etc.). These materials can be used in almost all pH ranges and recently its use is successively increased because of nonirritative property. Since the concern of safety has enlarged at industrial application, naturaly the use of amphoteric surfactants with new special properties has more. We report general properties of chemical structures of imidazoline surfactants effect.
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.
양쪽성 계면활성제의 유도체 합성 및 계면성에 관한 연구 ( 제6보 ) - 양쪽성 계면활성제의 미셀 형성에 대한 열역학적 고찰
노윤찬,이선주,남기대 ( Y . C . Ro,S . J . Lee,K . D . Nam ) 한국공업화학회 1995 공업화학 Vol.6 No.4
합성한 카르복시화 아미드류 3종, 술폰화 또는 황산화 이미다졸린류 3종 그리고 술폰화 아미드류 3종 등 총 9종의 양쪽성 계면활성제에 대하여 15∼45℃의 온도 범위에서 임계미셀농도(cmc)를 결정하였다. 미셀 형성에 있어 자유 에너지 변화는 엔탈피 및 엔트로피의 변화로 전환될 수 있다. 즉 미셀화에 따른 표준자유에너지 변화 ΔG˚m는 열역학적으로 취급해서 cmc로 부터 산출하고 ΔG˚m를 ΔH˚m과 ΔS˚m으로 분리할 수 있다. 그리고 이들의 결과들은 이미 알려진 다른 문헌상의 값들과 비교하였다. 미셀 형성 과정은 전적으로 계면효과에 기인하는 결과를 얻었고 15∼45℃ 범위에서 온도와 관계없이 발열과정이며 ΔH˚m 값은 -1.2∼-2.3Kcal/㏖이었다. 이들 양쪽성 계면활성제의 친수성이 증가하면 계면효과는 감소한다. 15∼45℃ 범위에서 자발적으로 미셀 형성 과정이 진행되고, 엔트로피 조절 과정에 의하여 미셀 형성이 이루어지며 엔트로피는 증가한다. The critical micelle concentrations(cmc) was studied on nine kinds of amphoteric surfactants; three kinds of carboxylated amides, three kinds of sulfated or sulfonated imidazoline and three kinds of sulfonated amides at 15 to 45℃ range. The change of free energy about micelle formation can be converted into the change of enthalpy and entropy. The standard free energy change ΔG˚m of micellization was estimated from the cmc, by treating the formation of micelles as thermodynamics; the determination of the variation of cmc the enables ΔG˚m to be split into the correspondingΔH˚m and ΔS˚m. These results were examined by making a comparison between this results and the previously known values. The process of micelle formation obtained the result that perfactly was attributed to interface effect and the exothermic reaction which ΔH˚m values were -1.2∼-2.3Kcal/㏖ was not related with temperature at 15 to 45℃ range. The interface effect was decresed with the hydrophilic increase of the amphoteric surfatants. The process of micelle formation was proceeded spontaneously at 15 to 45℃ range and entrophy increased with consisting of micelle formation to control entrophy process.
긴사슬 알킬 우로칸에스테르의 합성 및 유기물질에서의 가용성
노윤찬,정환경,남기대,이진희 ( Y . C . Ro,H . K . Jeong,K . D . Nam,J . H . Lee ) 한국유화학회 1993 한국응용과학기술학회지 Vol.10 No.1
The syntheses of urocanic acid esters was optimized, starting from p-toluenesulfonic acid salt of this acid and long chain fatty alcohols in the organic solvent and extracting water from it by means of azeotropic Compound. The salts of these urocanic acid esters showed amphoteric properties, but their micellization enhances their rate of hydrolysis leading to the free amine. Nevertheless the long chain gives to the esters themselves an amphoteric character allowing their solubilization in micellar media and in microemulsions the result, yield could enhanced.
양쪽성계면활성제의 유도체합성 및 계면성에 관한 연구 ( 제7보 ) - 이미다졸린으로부터 유도된 양쪽성계면활성제의 세정성 -
노윤찬,김태영,남기대 ( Y . C . Ro,T . Y . Kim,K . D . Nam ) 한국유화학회 1995 한국응용과학기술학회지 Vol.12 No.1
Water pollution, which is caused by surfactants, is increased by insolubility and excessive uses of detergents. The detergency properties of nine kinds of amphoteric surfactants derived from imidazoline were investigated and compared with sodium jauryl suifats(SLS) of petrochemical surfactant by using detergent formulations. Several physico-chemical properties were measured to investigate the effective factors on detergency. From the comparision of these compounds with SLs, it was found that 1-(2-hydroxyethyl)-1-(3-sulfonatedpropyl)-2-undecyl-2-imidazolinum [Ⅳ] has the most outstanding characteristics of detergency as a nonpolluting detergent. Detergency process of surfactants were discussed in relation to physico-chemical treatments. Performance improvement on detergency is made work of adhesion to soil as small as possible. Therefore these results show that contamination is easily removed and industrial applications may be respected.