title: Surface activity of a fluorinated carbohydrate ester in water/carbon dioxide emulsions.
abstract: The water/carbon dioxide (W/CO2) interfacial activity and emulsifying capacity of hydrocarbon and fluorinated carbohydrate esters are investigated of the first time and compared to the performance of sodium-bis(2-ethylhexyl)sulfosuccinate (AOT). The reduction of the W/CO2 interfacial tension was measured using a pendant drop tensiometer equipped with a cell view pressurized with CO2 at 80 bar and 45°C. It was found that the interface stabilization improved in the order AOT<6-O-myristoyl mannose<6-O-(2H,2H,3H,3H-perfluoroundecanoyl)-D-mannose. In the latter case, a drastic reduction of the W/CO2 interfacial tension was observed (85% reduction, interfacial tension at the equilibrium=3.6 mN/m), which emphasizes the advantage of using a fluorinated CO2-philic tail and the potential of sugars as hydrophilic head. The formulation of stable W/CO2 emulsions was also achieved using the fluorinated mannose derivative. This study paves the way to the design of a novel class of competitive surface active agents for W/CO2 emulsions.
authors.affiliation: Center for Education and Research on Macromolecules (CERM), Chemistry Department, University of Liege (ULg), Sart-Tilman, Liege, Belgium.
authors.forename: Audrey
authors.initials: A
authors.lastname: Favrelle
authors.forename: Cédric
authors.initials: C
authors.lastname: Boyère
authors.forename: Kien My
authors.initials: KM
authors.lastname: Tran
authors.forename: David
authors.initials: D
authors.lastname: Alaimo
authors.forename: Brice
authors.initials: B
authors.lastname: Calvignac
authors.forename: Michel
authors.initials: M
authors.lastname: Paquot
authors.forename: Frank
authors.initials: F
authors.lastname: Boury
authors.forename: Christine
authors.initials: C
authors.lastname: Jérôme
authors.forename: Antoine
authors.initials: A
authors.lastname: Debuigne
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D004655:Emulsions; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D004655:Emulsions; D006845:Hydrocarbons, Fluorinated; D013501:Surface-Active Agents; D014867:Water; D002245:Carbon Dioxide