Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Effects of Temperature on the Rheology of Lecithin/CaCl2 Organogels

Lecithin/CaCl2 유기젤의 온도 영향에 대한 유변학적 연구

  • Jung, Yeon-Geon (Department of Chemical Engineering, The Kumoh National Institute of Technology) ;
  • Lee, Hee-Young (Department of Chemical Engineering, The Kumoh National Institute of Technology)
  • 정연건 (금오공과대학교 화학공학과) ;
  • 이희영 (금오공과대학교 화학공학과)
  • Received : 2018.02.23
  • Accepted : 2018.03.09
  • Published : 2018.04.10
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Abstract

Lecithin, a zwitterionic phospholipid, forms spherical reverse micelles in organic solvents such as decane. The addition of multivalent ions like calcium chloride to lecithin organosols induces the transformation of organosols into organogels. A variety of applications of such organogels were found in gelation of fuels, food processing and drug delivery. Here, we investigated the effect of temperature on their rheological properties. In particular, the organogels showed a distinct melting temperature (${\sim}95^{\circ}C$) and their elastic properties decreased with increasing temperature. This is maybe due to the fact that the electrostatic interaction between lecithin and calcium chloride could be weaken with increasing temperature.

쌍성이온 인지질의 한 종류인 lecithin은 decane과 같은 유기용매상에서 구 모양의 역마이셀을 만든다. 이러한 lecithin을 포함하고 있는 유기졸에 염화칼슘과 같은 다원자가의 이온을 첨가하면 유기젤이 형성된다. 이러한 유기젤은 연료의 젤화, 음식 준비, 약물전달 등에 다양하게 활용될 수 있다. 본 연구에서는 이러한 젤의 온도 영향을 유변학적 관점에서 조사하였다. 유기젤의 유변학 연구를 통하여 유기젤의 녹는점(${\sim}95^{\circ}C$)과 온도가 증가하면서 젤의 고체와 같은 성질이 줄어듦을 확인하였다. 온도가 증가함에 따라서 유기젤의 고체와 같은 성질이 줄어드는 이유는 lecithin과 염화칼슘 사이의 정전기적 상호작용이 약해지기 때문으로 판단된다.

Keywords

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