Novel Kinetic Effects in Vkcoelasttc Surfactant Solutions Under Shear

Autor: W.A. Hamilton, P.J. Kreke, Paul Butler, Linda J. Magid, B. Hammouda, John B. Hayter
Rok vydání: 1994
Předmět:
Zdroj: MRS Proceedings. 376
ISSN: 1946-4274
0272-9172
DOI: 10.1557/proc-376-309
Popis: Using small-angle neutron scattering (SANS), we have investigated the transient alignment and relaxation under Couette shear of viscoelastic aqueous micellar solutions of cetyltrimethylarmmonium 3,5-dichlorobenzoate (CTA3,5C1) and CTA3,5C1/CTAB mixtures at concentrations well above ф* (but below 1.0 wt. %). Time constants of the order of ten's of minutes are reported for alignment and relaxation, orders of magnitude slower than any previously observed in similar micellar systems. The collective properties of the network of entangled, threadlike micelles, rather than the individual micellar segments, dominate the alignment and relaxation behavior. At low micellar surface charge density (σ) (e.g., in pure CTA3,5C1), the first observation of alignment proceeding in two stages has been made. Increasing a decreases by an order of magnitude the shear rate required to reach full alignment and provides a comparable decrease in the rate constant for relaxation after cessation of shear.
Databáze: OpenAIRE
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