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|Title:||Rheology of Lyotropic Liquid Crystals of Aerosol OT. II. High Concentration Regime|
|Abstract:||Dynamic and steady-shear rheological measurements of the AOT/water lamellar liquid crystalline phase are reported as a function of surfactant concentration. Dynamical measurements indicate that the AOT/water lamellar phase behaves as a weak gel; i.e., both the elastic and the loss moduli, G′ and G″ are nearly independent of frequency (ω) and G′ is an order of magnitude greater than G″ in the range 10-2 to 102 s-1. Complex and dynamic viscosities decrease with frequency as ω-1. Steady shear measurements demonstrate a shear thinning behavior with η ∝ γ-1 but η does not tend to a Newtonian plateau at low shear rates. The measured material functions (G′, η*, and η) go through a minimum at around 50 wt% AOT. This minimum is explained in terms of attractive and repulsive colloidal forces in the bilayers and in terms of interactions among the liquid crystalline microdomains. © 1993 Academic Press. All rights reserved.|
|Appears in Collections:||Producción científica UdeG (prueba)|
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