Effect of shear on a lyotropic lamellar phase
نویسندگان
چکیده
منابع مشابه
Shear-induced collapse in a lyotropic lamellar phase.
An entropically stabilized cetylpyridinium chloride, hexanol, and heavy brine lyotropic lamellar phase subjected to shear flow has been observed here by small angle neutron scattering to undergo collapse of smectic order above a threshold shear rate. The results are compared with theories predicting that such a lamellar phase sheared above a critical rate should lose its stability by a loss of ...
متن کاملOscillating viscosity in a lyotropic lamellar phase under shear flow.
We report some time-dependent behavior of lyotropic lamellar phase under shear flow. At fixed stress, near a layering instability, the system presents an oscillating shear rate. We build up a new stress versus shear rate diagram that includes temporal behavior. This diagram is made of two distinct branches of stationary states which correspond, respectively, to disordered and ordered multilamel...
متن کاملThe effect of shear flow on the Helfrich interaction in lyotropic lamellar systems.
We study the effect of shear flow on the entropic Helfrich interaction in lyotropic surfactant smectic fluids. Arguing that flow induces an effective anisotropic surface tension in bilayers due to a combination of intermonolayer friction, bilayer collisions and convection, we calculate the reduction in fluctuations and hence the renormalised change in effective compression modulus and steady-st...
متن کاملAnisotropic Small Angle Light and Neutron Scattering from a Lyotropic Lamellar Phase under Shear
The influence of shear on the lamellar phase of a semi-dilute solution (36il (w /w) of tetra ethylenglycol dodecylether (CH3[CH2]11 [OCH2CH2]40H, C12E4) in water was investigated by Small Angle Light Scattering (SALS), Small Angle Neutron Scattering (SANS) and rheology. A plateau modulus was determined by low amplitude oscillatory shear experiments. A strong scattering peak perpendicular to the...
متن کاملSupplemental Information for Dynamic orientation transition of lyotropic lamellar phase at high shear rate
Typical SAXS profiles and lamellar spacing d as a function of shear rate for the system with B/H=0.30 at T=25◦C are shown in fig. 1. This systems shows the orientation transition at γ̇c/a=300s −1 (see Fig. 6 in the main text). Lamellar spacing d at B/H=0.30 slightly decreases with increase in the shear rate, while at B/H=0.32 it slightly reduces at low shear rate and stays almost constant at hig...
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ژورنال
عنوان ژورنال: Journal de Physique II
سال: 1993
ISSN: 1155-4312,1286-4870
DOI: 10.1051/jp2:1993211