Dispersion morphology diagrams for three-phase, [open quotes]microemulsion[close quotes] emulsions. 2. [open quotes]Disappearance[close quotes] of morphology-transition lines

Journal Article · Thu Nov 17 04:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100097a041· OSTI ID:6868047

Johnson, G K ^[1]; Dadyburjor, D B ^[2]; Smith, D H ^[3]

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1. Morgantown Energy Technology Center, WV (United States)
2. West Virginia Univ., Morgantown, WV (United States)
3. Morgantown Energy Technology Center, WV (United States) Univ. of Oklahoma, Norman, OK (United States)

The limits over which the oil-rich top phase (T), middle-phase microemulsion (M), or water-rich bottom phase (B) is the continuous phase in steady-state, three-phase macroemulsions have been determined by means of electrical conductivity measurements for the amphiphile/oil/[open quotes]water[close quotes] system C[sub 6]H[sub 13](OC[sub 2]H[sub 4])[sub 2]OH/n-tetradecane/aqueous 10 mM NaCl. Measurements were made at three different temperatures and apparent wettability conditions: (a) 45[degrees]C, wetting middle phase; (b) 25[degrees]C, no wetting phase; and (c) 12[degrees]C, wetting bottom phase. The results at 25[degrees]C were in accord with expectations from previous predictions and experiments; but for both two-phase and three-phase emulsions no abrupt, [open quotes]first-order[close quotes] transitions between M- and T-continuous emulsions at 45[degrees]C or between M- and B-continuous emulsions at 12[degrees]C were found. Instead, these changes of continuous phase appeared to occur smoothly and continuously between their respective single-phase and two-phase limits. It is not yet clear if the [open quotes]disappearance[close quotes] of first-order morphology transitions correlates with phase wettability transitions; the phenomenon suggests the possibility of bicontinuous two-phase and three-phase macroemulsions. 31 refs., 11 figs.

• OSTI ID: 6868047
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:46; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
99 GENERAL AND MISCELLANEOUS
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ALKALI METAL COMPOUNDS
ALKANES
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EMULSIONS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
MATHEMATICAL MODELS
MICROEMULSIONS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
SODIUM CHLORIDES
SODIUM COMPOUNDS
WATER
WETTABILITY