Journal of the Society of Cosmetic Scientists of Korea (대한화장품학회지)

Society of Cosmetic Scientists of Korea (대한화장품학회)
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Study of Nano-emulsion Formation by Different Dilution Method

희석 방법에 따른 나노에멀젼 형성 연구

  • Cho, Wan-Goo (College of Alternative Medicine, Jeonju University) ;
  • Han, Sang-Gil (Industry Academy Cooperation Foundation, Soonchunhyang University)
  • 조완구 (전주대학교 대체의학대학 기초의과학과) ;
  • 한상길 (순천향대학교 산학협력단)
  • Received : 2012.05.16
  • Accepted : 2012.08.20
  • Published : 2012.09.30
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Abstract

The influence of different dilution procedures on the properties of oil-in-water (O/W) nano-emulsions obtained by dilution of oil-in-ethanol (O/E) microemulsions with water has been studied. The system water/ethanol/nonionic surfactant/silicone oil with ethanol was chosen as model system. The dilution procedures consisted of adding water (or microemulsion) stepwise. By mixing O/E microemulsions into water, nano-emulsions with droplet diameters of 30 nm were obtained. In contrast, by mixing water into O/E microemulsion, emulsions with diameter of 400 nm were obtained The dilution methods were shown to be a key factor determining the properties of the emulsions. There were no change in diameters of nanoemulsion droplets against time, however sizes of droplets in the emulsion with larger droplets were increased with time and the mechanism of unstability was thought to be Ostwald ripening.

Oil-in-ethanol (O/E) 마이크로에멀젼을 물에 희석하여 얻은 O/W 나노에멀젼의 성질에 대하여 다른 희석 과정의 영향을 연구하였다. 물/에탄올/비이온성계면활성제/실리콘 오일 계를 모델 계로 선택하였다. 희석과정은 물(또는 마이크로에멀젼)을 마이크로에멀젼(또는 물)에 단계별로 첨가하는 방법으로 구성되었다. O/E 마이크로에멀젼을 물에 첨가하여 혼합하면 30 nm 정도의 입경을 가진 나노에멀젼을 얻을 수 있었다. 반면에 물을 O/E 마이크로에멀젼에 첨가하면 400 nm의 입경을 가진 에멀젼을 얻을 수 있다. 희석 방법이 얻어지는 에멀젼의 성질에 중요한 역할을 하였다. 시간에 따른 나노에멀젼의 입자 변화는 관찰되지 않았으나 입자가 큰 에멀젼은 시간에 따라 입경이 증가하였으며 불안정화 기작은 오스트왈드 라이퍼닝으로 추정되었다.

Keywords

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