Characterization of Water/Sucrose Laurate/n-Propanol/ Allylbenzene Microemulsions

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Date
2012-03-22Author
Fanun, Monzer
Ayad, Ziad
Mudalal, Samer
Dahoah, Shirel
Meltzer, Diana
Schwarze, Michael
Schoma¨cker, Reinhard
Blum, Jochanan
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Water/n-propanol/sucrose laurate/allylbenzene
micellar systems were formulated and applied in the
isomerization of allylbenzene in the presence of heterogenized
derivatives of some platinum group catalysts. The
ratio (w/w) of n-propanol/surfactant studied herewith was
2/1. Temperature insensitive microemulsions were found.
The microemulsions were characterized by the volumetric
parameters, density, excess volume, ultrasonic velocity,
and isentropic compressibility. The densities increase with
increases in the water volume fraction. Excess volumes of
the microemulsions decrease for water volume fractions
below 0.2, level off for water volume fractions between 0.2
and 0.6 then increase for water volume fractions above 0.6.
Excess volumes of the studied micellar systems increase
with temperature. Isentropic compressibilities increase
with temperature for water volume fractions below 0.8 and
decrease for water volume fractions above 0.8. Structural
transitions from water-in-oil to bicontinuous to oil-in-water
occur along the microemulsion phase. The particle hydrodynamic
diameter of the oil-in-water microemulsions at the
0.95 water volume fraction was found to decrease with
temperature.