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A Rheological Approach to Viscoelastic Worm‐Like Micelles of Tunable Properties
Author(s) -
Parathakkatt Sudheesh,
George Jinu,
Sajeev Moothandassery Sankarakutty,
Sreejith Lisa
Publication year - 2009
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-009-1114-x
Subject(s) - viscoelasticity , rheology , chemistry , pulmonary surfactant , micelle , ammonium bromide , viscosity , chemical engineering , cationic polymerization , thermodynamics , polymer chemistry , organic chemistry , composite material , aqueous solution , materials science , biochemistry , physics , engineering
The rheological behavior of micellar solutions of cationic surfactant, cetyl trimethyl ammonium bromide in the presence of a salt (KBr) and a co‐surfactant ( n ‐octanol) were analyzed. Shear viscosity and shear moduli were measured as a function of concentrations of the co‐surfactant and additive. When these concentrations attained a certain critical threshold value, the micellar solution was found to exhibit a nonlinear viscoelastic behavior. It is due to the formation of supramolecular structures, which has been described by the Maxwell model of a viscoelastic fluid typical of worm‐like micelles. The rheological behavior was also analyzed using Carreau and Carreau–Gahleitner models which were found to be in good agreement with the experimental results.