ISSN:
1435-1536
Keywords:
Key words Flow birefringence
;
shear flow
;
surfactant
;
stress optical rule
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The rheo-optical properties of different viscoelastic solutions of surfactant are investigated in order to gather experimental data which allow for the computation of the stress optical coefficient C. The surfactant which is the widely used cetyltrimethylammonium bromide (CTAB) is mixed with potassium bromide, in various amounts in order to vary the salinity of the solvent. Flow birefringence experiments and rheological measurements are performed on these solutions in order to study the dependence of the angle of extinction χ, of the birefringence intensity Δn and of the shear stress σ yx with the shear rate γ˙. These data are used to check the stress optical law which turns out to be valid in a wide range of shear rates. The stress optical coefficient C is then computed: it is found to vary with the concentration of surfactant and with the salinity of the solvent.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003960050224
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