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Effect of Polyoxyethylene Type Nonionic Surfactant and Polar Lipophilic Oil on Solubilization of Mixed Surfactant Microemulsion Systems
journal contribution
posted on 2016-02-18, 21:52 authored by Kaushik Kundu, Bidyut
K. PaulIn the present report, the water
solubilization capacity of water-in-oil
microemulsion systems comprising mixed surfactants, that is, anionic
sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and nonionic(s) [viz.,
polyoxyethylene (2) stearyl ether (Brij-72), polyoxyethylene (10)
stearyl ether (Brij-76), polyoxyethylene (20) stearyl ether (Brij-78),
polyoxyethylene (2) oleyl ether (Brij-92), polyoxyethylene (10) oleyl
ether (Brij-97), and polyoxyethylene (20) oleyl ether (Brij-98)] was
investigated in polar lipophilic oils [viz., ethyl myristate (EM),
isopropyl myristate (IPM), and isopropyl palmitate (IPP)] with varying
mole fractions of nonionic surfactant (Xnonionic) at a fixed surfactant concentration and 303 K. A maximum (i.e.,
synergism) in water solubilization (ω0,max) was observed
at an optimal value of mole fraction of nonionic surfactant (Xnonionic,max). The solubilization efficiency
parameter (SP*water) and the free energy of dissolution
(ΔG0s) were evaluated
for these mixed systems. All of the physicochemical parameters for
solubilization (viz., ω0,max, Xnonionic,max, and SP*water) were found to be dependent
on both nonionic surfactants and oils. A minimum in ΔG0s was observed at corresponding Xnonionic,max, where a maximum in SP*water was evidenced. The IPP-based system was found to be most efficient,
whereas the EM-based system was least efficient. An attempt was made
to correlate the interdependence of physicochemical (ω0,max or SP*water) and thermodynamic (ΔG0s) parameters.
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AOTΔ G 0smole fractionlipophilic oilsmole fractionsSPMixed Surfactant Microemulsion SystemsInIPMIPPphysicochemical parametersEMstearylsolubilization efficiency parametervizether303 KXnonionicwater solubilization capacityoleylBrijisopropyl palmitatepolyoxyethylenesurfactant concentrationmaxPolar Lipophilic OilPolyoxyethylene Type Nonionic Surfactant
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