Investigation of Nonionic Surfactant Dynol-604 Based Reverse Microemulsions Formed in Supercritical Carbon Dioxide

• Published in: Langmuir Vol. 17; no. 26; pp. 8040 - 8043
• Main Authors: Liu, Juncheng, Han, Buxing, Li, Ganzuo, Zhang, Xiaogang, He, Jun, Liu, Zhimin
• Format: Journal Article
• Language: English
• Published: American Chemical Society 25.12.2001
• ISSN: 0743-7463; 1520-5827
• DOI: 10.1021/la010743d

The solubility of Dynol-604 (a surfactant) in supercritical (SC) CO2 and the phase behavior of the CO2/water/Dynol-604 system were studied at different temperatures and pressures. The results showed that the solubility of the surfactant in SC CO2 is high and one-phase water-in-CO2 microemulsions could be formed although Dynol-604 is a nonfluorous and nonsiloxane nonionic surfactant. The solvatochromic probe studies and the UV spectrum of lysozyme in the supercritical CO2/water/Dynol-604 system further proved the existence of a water domain in the supercritical CO2 microemulsions.