Geetha Basappa
Articles written in Pramana – Journal of Physics
Volume 53 Issue 1 July 1999 pp 223-235 Liquid Crystals And Other Soft Materials
Linear and nonlinear rheology of wormlike micelles
A K Sood Ranjini Bandyopadhyay Geetha Basappa
Several surfactant molecules self-assemble in solution to form long, cylindrical, flexible wormlike micelles. These micelles can be entangled with each other leading to viscoelastic phases. The rheological properties of such phases are very interesting and have been the subject of a large number of experimental and theoretical studies in recent years. We shall report our recent work on the macrorheology, microrheology and nonlinear flow behaviour of dilute aqueous solutions of a surfactant CTAT (Cetyltrimethylammonium Tosilate). This system forms elongated micelles and exhibits strong viscoelasticity at low concentrations (∼0.9 wt%) without the addition of electrolytes. Microrheology measurements of
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