Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
; Shandong Univ, State Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
The solubility of Ls-54 surfactant in supercritical CO2 was determined. It was found that the surfactant was highly soluble in SC CO2 and the water-in-CO2 microemulsions could be formed, despite it being a non-fluorous and non-siloxane nonionic surfactant. The main reasons for the high solubility and formation of the microemulsions may be that the surfactant has four CO2-philic groups (propylene oxide) and five hydrophilic groups (ethylene oxide) and its molecular weight are relatively low. The results of this work provide useful information for designing CO-soluble non-fluorous and non-siloxane surfactants. The phase behavior of the CO2/Ls-54/H2O system, solvatochromic probe study, and the UV spectrum of lysozyme proved the existence of water domains in the SC CO2 microemulsions. The method of synchrotron radiation small-angle X-ray scattering was used to obtain the structural information on the Ls-54 based water-in-CO2 reverse micelles. By using the Guinier plot (In I(q) versus q(2)) on the data sets in a defined small q range (0.022-0.040 Angstrom(-1)), the radii of the reverse micelles were obtained at different pressures and molar ratio of water to surfactant. W-0, which were in the range of 20.4-25.2 Angstrom.
Liu, JC,Han, BX,Zhang, HL,et al. Formation of water-in-CO2 microemulsions with non-fluorous surfactant Ls-54 and solubilization of biomacromolecules[J]. CHEMISTRY-A EUROPEAN JOURNAL,2002,8(6):1356-1360.
Liu, JC.,Han, BX.,Zhang, HL.,Li, GZ.,Zhang, XG.,...&董宝中.(2002).Formation of water-in-CO2 microemulsions with non-fluorous surfactant Ls-54 and solubilization of biomacromolecules.CHEMISTRY-A EUROPEAN JOURNAL,8(6),1356-1360.
Liu, JC,et al."Formation of water-in-CO2 microemulsions with non-fluorous surfactant Ls-54 and solubilization of biomacromolecules".CHEMISTRY-A EUROPEAN JOURNAL 8.6(2002):1356-1360.