Sj. Candau et al., RHEOLOGICAL BEHAVIOR OF WORM-LIKE MICELLES - EFFECT OF ELECTROSTATIC INTERACTIONS, Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 16(9), 1994, pp. 1401-1410
Both linear and non-linear viscoelasticity experiments have been perfo
rmed in semi-dilute micellar aqueous solutions of ethanediyl-alpha,ome
ga-bis (dodecylmethylammonium bromide) as a function of solution chlor
ide (NaCl) concentration. The results suggest that both linear and non
-linear properties are affected by the electrostatic interactions. In
particular, the plateau modulus GI and the ratio sigma(m)/G(infinity)(
'), where sigma(m) represents the plateau value in a stress-shear rate
experiment, are enhanced as the electrostatic interactions are screen
ed by addition of salt. The zero-shear viscosity is lowered upon addit
ion of NaCl, due Likely to an exchange of the Cl- ions with the Br- co
unterions.