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Received April 22, 2003
Accepted January 5, 2004
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Sodium Salt of Bis (2,2,3,3,4,4,5,5-octafluoro-1-pentanol) Sulfosuccinate를 이용한 초임계 CO2+ 물 계의 마이크로에멀젼
Water-in-Supercritical CO2 Microemulsion with Sodium Salt of Bis(2,2,3,3,4,4,5,5-octafluoro-1-pentanol) Sulfosuccinate
한국과학기술연구원 초임계유체연구실, 136-791 서울시 성북구 하월곡동 39-1 1경희대학교 화학과, 449-701 경기도 용인시 기흥읍 서천리 1 2서울대학교 응용화학부, 151-742 서울시 관악구 신림동 산 56-1 3서강대학교 화공생명학과, 121-742 서울시 마포구 신수동 1
Supercritical Fluids Research Lab., Korea Institute of Science and Technology, 39-1, Hawolgok-dong, Sungbuk-gu, Seoul, 136-791, Korea 1Department of Chemistry, Kyung Hee University, 1, Seocheon-ri, kiheung-up, Yongin, Gyeonggi 449-701, Korea 2Department of Chemical Engineering, Seoul National University, San 56-1, Shilim-dong, Gwanak-gu, Seoul 151-742, Korea 3Department of Chemical and Biomolecular Engineering, Sogang University, 1, Sinsu-dong, Mapo-gu, Seoul 121-742, Korea
limjs@sogang.ac.kr
Korean Chemical Engineering Research, April 2004, 42(2), 175-180(6), NONE Epub 14 May 2004
Abstract
대부분의 촉매, 이온, 단백질같이 비휘발성이고 친수성인 물질들은 초임계 이산화탄소에서는 잘 용해되지 않는 단점을 가지고 있다. 이는 이산화탄소가 무극성이며, 극성인 물에 대해 용해력이 매우 낮기 때문이다. 본 연구에서는 이러한 한계를 극복하기 위한 방법으로, 물과 이산화탄소의 마이크로에멀젼 형성에 관한 연구를 실시하였다. 물과 이산화탄소의 에멀젼을 형성시키기 위하여 친수기와 친이산화탄소기를 동시에 지닌 hydrocarbon-fluorocarbon hybrid 계면활성제인 sodium salt of bis(2,2,3,3,4,4,5,5-octafluo-ro-1-pentanol) sulfosuccinate(F-AOT)를 합성하였다. 기초 데이터로 초임계 이산화탄소내에서 계면활성제의 용해도를 알아보기 위해 variable volume cell을 이용하여 계면활성제의 농도에 따른 cloud point를 측정하였고, 또한, 물+계면활성제+이산화탄소계의 cloud point측정을 통하여 마이크로에멀젼이 안정적으로 형성되는 '마이크로에멀젼 안정 영역'을 구하였다. 초임계 CO2+물 계의 마이크로에멀젼은 온도 308.34에서 368.25 K까지, 압력 14.06에서 63.41 MPa까지의 조건에서 안정적으로 형성되었다.
Non-volatile hydrophilic substances such as ions, proteins, and catalysts have disadvantage that they are insoluble in liquid or supercritical CO2 because of its very low dielectric constant and polarizability per volume. To overcome this disadvantage, we investigated the formation of the water-in-CO2 microemulsion that nano size water droplets were dispersed into CO2. In order to form this microemulsion, the fluorocarbon-hydrocarbon hybrid surfactant, that is, the sodium salt of bis (2,2,3,3,4,4,5,5-octafluoro-1-pentanol) sulfosuccinate (F-AOT) which has CO2 philic chains and hydrophilic head group simultaneously was synthesized. To investigate the solubility of this surfactant in CO2, the cloud point was measured with its various concentrations. And "the stability region of microemulsion" was also obtained by measuring the cloud point of water-in-CO2 microemulsion. It was found that the water-in-CO2 microemulsion was stably formed in the temperature range from 308.34 to 368.25 K, and in the pressure range from 14.06 to 63.41 MPa.
Keywords
References
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Eastoe J, Cazelles BMH, Steytler DC, Holmes JD, Pitt AR, Wear TJ, Heenan RK, Langmuir, 13(26), 6980 (1997)
Liu ZT, Erkey C, Langmuir, 17(2), 274 (2001)
Eastoe J, Nave S, Downer A, Paul A, Rankin A, Tribe K, Penfold J, Langmuir, 16(10), 4511 (2000)
Kim HW, Jin YW, Park KH, Kim HD, Yoon BH, Wai CM, "Metal Nanoparticle Synthesis and its Catalytic Organic Reactions in Water-in-CO2 Microemulsion using Fluorinated AOT," Proceedings of 1st International Symposium on Supercritical Fluid Technology for Energy and Environment Applications, 383-388 (2002)
Park JY, Jin HS, Lee YW, Lim JS, "Interfacial Tension bewteen scCO2 and Nickel-Plating Solution with Anionic Surfactant," Proceedings of 1st International Symposium on Supercritical Fluid Technology for Energy and Environment Applications, 251-255 (2002)
