Simple-Complex Fluid Transition in Microemulsions

Autor:	Moez Guettari, Tahar Tajouri, Ghazi Kassab, Imen Ben Naceur
Rok vydání:	2012
Předmět:	Materials science Polymers and Plastics Thermodynamics Viscometer General Chemistry Apparent viscosity Condensed Matter Physics Shear rate Viscosity Rheology Materials Chemistry Shear stress Newtonian fluid Microemulsion
Zdroj:	Journal of Macromolecular Science, Part B. 51:2171-2182
ISSN:	1525-609X 0022-2348
DOI:	10.1080/00222348.2012.665781
Popis:	The aim of this work was to study the rheological behavior of water in-oil microemulsion formulated with AOT (sodium bis(2-ethylhexyl) sulfoccinate) in isooctane over a temperature range from 25°C to 55°C for the oil/AOT volume fraction φ m =0.1 and various AOT and H2O molar ratios, W0, ranging from 0 to 45. The apparent viscosity was measured vs. shear rate by a rotational concentric cylinder viscometer. It was shown that above s−1, the solutions utilized behaved as Newtonian liquids. The absolute viscosities were deduced from the shear stress- shear rate rheograms. For W0 17; the viscosity remained constant and then increased above a critical temperature, Tc, depending on W0. For the molar ratio W0,c = 17; the studied viscosity remained constant, η(W0,c) = (1.17 ± 0.04) cP, for the temperature range studied. Thus, a simple–complex fluid transition...
Databáze:	OpenAIRE
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