Microemulsions in supercritical hydrochlorofluorocarbons

Journal Article · Wed Oct 30 04:00:00 EST 1996 · Langmuir

DOI:https://doi.org/10.1021/la960210i· OSTI ID:420715

Jackson, K; Fulton, J L ^[1]

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1. Pacific Northwest National Lab., Richland, WA (United States)

We report the properties of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) microemulsions formed in supercritical hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons, and flourocarbons. The fluids used in this study include compounds that are of low toxicity and flammability and that are expected to remain environmentally acceptable well into the next century (e.g., 1,1,1, 2-tetrafluoroethane (R134a) and chlorodifluoromethane (R22)). We show that it is possible to form a water-in-oil type of microemulsion in a low molecular weight HCFC (R22). In addition to these HCFCs, We also review the ability to form microemulsions in 14 other fluids (ethane, propene, propane, n-butane, n-pentane, n-haxane, isobutane, isooctane, difluoromethane, trifluoromethane, hexafluoroethane, sulfur haxafluoride, xenon, and carbon dioxide) at conditions just above or below the critical point (0.75 < T/T{sub c} <1.1) of the solvent. We report extensively the phase behavior of AOT and didodecyldimethylammonium bromide microemulsions formed in a supercritical HCFC, R22. We show that microemulsions in HCFCs are practical alternatives to other fluids, such as supercritical carbon dioxide. 56 refs., 7 figs., 1 tab.

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 420715
• Journal Information: Langmuir, Journal Name: Langmuir Journal Issue: 22 Vol. 12; ISSN 0743-7463; ISSN LANGD5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
66 PHYSICS
DIELECTRIC PROPERTIES
HYDROCARBONS
MICELLAR SYSTEMS
MICROEMULSIONS
MOLECULAR WEIGHT
NUMERICAL DATA
PHASE DIAGRAMS
PROTEINS
SOLUBILITY
SOLVENTS
SUPERCRITICAL STATE
SYNTHESIS