Viscosity Peak due to Shape Transition from Wormlike
to Disklike Micelles: Effect of Dodecanoic Acid
Version 3 2018-04-27, 17:19
Version 2 2018-04-13, 18:53
Version 1 2018-04-13, 18:50
Posted on 2018-04-27 - 17:19
Here, we have investigated the synergistic growth of long wormlike micelles
and their transformation into disklike micelles, which occurs in three-component
solutions composed of sodium lauryl ether sulfate (SLES; anionic),
cocamidopropyl betaine (CAPB; zwitterionic), and dodecanoic acid (HC12;
nonionic). The solution rheology is characterized in terms of zero-shear
viscosities and characteristic times for micellar breaking and reptation.
Furthermore, the microstructure evolution, leading to the observed
rheological behavior, is revealed by cryo-transmission electron microscopy
(TEM) micrographs. In all cases, the CAPB-to-SLES ratio is fixed,
whereas the fatty acid concentration is varied. At a certain HC12
concentration, the solution viscosity passes through a maximum. The
cryo-TEM imaging indicates that wormlike micelles appear before the
peak, grow further up to the peak, and finally transform into disklike
aggregates (a very rare micellar structure) after the peak. The transformation
of worms into disks leads to a drop in viscosity because the length-to-thickness
aspect ratio of the disks is significantly lower than that of the
worms. In this article, we elucidate the structure–rheology
relations in micellar solutions that might be applied for the design
of personal-care and household formulations.
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Anachkov, Svetoslav
E.; Georgieva, Gergana S.; Abezgauz, Ludmila; Danino, Dganit; Kralchevsky, Peter A. (2018). Viscosity Peak due to Shape Transition from Wormlike
to Disklike Micelles: Effect of Dodecanoic Acid. ACS Publications. Collection. https://doi.org/10.1021/acs.langmuir.8b00421
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AUTHORS (5)
SA
Svetoslav
E. Anachkov
GG
Gergana S. Georgieva
LA
Ludmila Abezgauz
DD
Dganit Danino
PK
Peter A. Kralchevsky