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Viscoelastic properties of sodium dodecyl sulfate with aluminum salt in aqueous solution

Angelescu, Daniel LU ; Khan, Ali LU and Caldararu, H (2003) In Langmuir 19(22). p.9155-9161
Abstract
The rheological properties of wormlike micellar solutions formed by the pseudo-ternary system sodium dodecyl sulfate (SDS)-Al(NO3)(3)-H2O have been studied at a fixed molar ratio Al(NO3)(3):SDS = 5.92:1 as a function of surfactant concentration. The linear data show that solutions behave as a Maxwell fluid and there are two well-defined domains characterized by scaling laws for surfactant concentration, with a maximum in the viscosity-surfactant concentration curve. Prior to the maximum, the system consists of linear micelles, and eta(0) (zero-shear rate viscosity) and tau(R) (relaxation time) are found to scale with surfactant concentration with exponents higher than those predicted by the theory of Cates. The results in the second domain... (More)
The rheological properties of wormlike micellar solutions formed by the pseudo-ternary system sodium dodecyl sulfate (SDS)-Al(NO3)(3)-H2O have been studied at a fixed molar ratio Al(NO3)(3):SDS = 5.92:1 as a function of surfactant concentration. The linear data show that solutions behave as a Maxwell fluid and there are two well-defined domains characterized by scaling laws for surfactant concentration, with a maximum in the viscosity-surfactant concentration curve. Prior to the maximum, the system consists of linear micelles, and eta(0) (zero-shear rate viscosity) and tau(R) (relaxation time) are found to scale with surfactant concentration with exponents higher than those predicted by the theory of Cates. The results in the second domain are not reflected by the dynamic behavior of entangled wormlike micelles, and they are interpreted in terms of formation of connected micelles. The nonlinear rheology is governed by the shear banding effect occurring for viscous entangled wormlike micellar solutions and branched micelles, and the properties identified by reduced stress sigma(p)/G(0) and the Weissenberg number, y(c)tauR, are compared to the values predicted on the basis of the theoretical model. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
19
issue
22
pages
9155 - 9161
publisher
The American Chemical Society
external identifiers
  • wos:000186177200012
  • scopus:0242492526
ISSN
0743-7463
DOI
10.1021/la034770a
language
English
LU publication?
yes
id
140d4516-3bf1-43e3-8113-cb5a18293e48 (old id 297129)
date added to LUP
2007-08-22 12:46:34
date last changed
2018-10-03 09:30:36
@article{140d4516-3bf1-43e3-8113-cb5a18293e48,
  abstract     = {The rheological properties of wormlike micellar solutions formed by the pseudo-ternary system sodium dodecyl sulfate (SDS)-Al(NO3)(3)-H2O have been studied at a fixed molar ratio Al(NO3)(3):SDS = 5.92:1 as a function of surfactant concentration. The linear data show that solutions behave as a Maxwell fluid and there are two well-defined domains characterized by scaling laws for surfactant concentration, with a maximum in the viscosity-surfactant concentration curve. Prior to the maximum, the system consists of linear micelles, and eta(0) (zero-shear rate viscosity) and tau(R) (relaxation time) are found to scale with surfactant concentration with exponents higher than those predicted by the theory of Cates. The results in the second domain are not reflected by the dynamic behavior of entangled wormlike micelles, and they are interpreted in terms of formation of connected micelles. The nonlinear rheology is governed by the shear banding effect occurring for viscous entangled wormlike micellar solutions and branched micelles, and the properties identified by reduced stress sigma(p)/G(0) and the Weissenberg number, y(c)tauR, are compared to the values predicted on the basis of the theoretical model.},
  author       = {Angelescu, Daniel and Khan, Ali and Caldararu, H},
  issn         = {0743-7463},
  language     = {eng},
  number       = {22},
  pages        = {9155--9161},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Viscoelastic properties of sodium dodecyl sulfate with aluminum salt in aqueous solution},
  url          = {http://dx.doi.org/10.1021/la034770a},
  volume       = {19},
  year         = {2003},
}