Viscous Flow Parameters of Mixed Nonionic Surfactants Microemulsions
- 19 September 2008
- journal article
- research article
- Published by Taylor & Francis in Journal of Dispersion Science and Technology
- Vol. 29 (9), 1257-1265
- https://doi.org/10.1080/01932690701857202
Abstract
The systems investigated were water/sucrose laurate/ethoxylated mono-di-glyceride/oil + ethanol. The oils were R (+)-limonene, isopropylmyristate and caprylic-capric triglyceride. The dynamic viscosity of the systems where the mixing ratio (w/w) of ethanol/oil and that of ethoxylated mono-di-glyceride/sucrose laurate equal unity were measured. Dynamic viscosity was measured as function of temperature at different water volume fractions. The measured viscosities for the samples in all of the systems decrease as the temperature increases. The thermodynamic parameters of viscous flow that include enthalpy, entropy, and Gibbs free energy were estimated. In all of the systems studied, the enthalpy of viscous flow remains constant as function of temperature and varies as the water content in the microemulsions vary. The entropy and the Gibbs free energy vary with both the temperature and the composition of the microemulsions. Linear relationships were observed between the enthalpy and entropy of viscous flow for the systems based on the three oils. The enthalpy-entropy compensation temperatures were determined and found to be 265, 349, and 322 K for the microemulsion systems based on R (+)-limonene, isopropylmyristate and caprylic-capric triglyceride, respectively.Keywords
This publication has 37 references indexed in Scilit:
- A study of the microstructure of four-component sucrose ester microemulsions by SAXS and NMRColloids and Surfaces A: Physicochemical and Engineering Aspects, 2001
- NMR in microemulsions. NMR translational diffusion studies of a model microemulsionColloids and Surfaces A: Physicochemical and Engineering Aspects, 1999
- MICROEMULSIONS: AN OVERVIEWJournal of Dispersion Science and Technology, 1997
- Development and characterization of microemulsions for ocular applicationEuropean Journal of Pharmaceutics and Biopharmaceutics, 1997
- Microemulsions — phase equilibria characterization, structures, applications and chemical reactionsAdvances in Colloid and Interface Science, 1996
- Electric conductivity in microemulsionsThe Journal of Chemical Physics, 1993
- Effect of alcohols on the phase behavior of microemulsionsThe Journal of Physical Chemistry, 1991
- A viscosity study on oil-in-water microemulsionsInternational Journal of Pharmaceutics, 1990
- How to study microemulsionsJournal of Colloid and Interface Science, 1987
- The viscosity of microemulsionsJournal of Colloid and Interface Science, 1969