Rheological study of ternary cubic phases

Shahidan Radiman, C. Toprakcioglu

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

We have studied the rheology of bicontinuous ternary cubic phases formed by the system didodecyldimethylammonium bromide (DDAB)/D2O/octane. The cubic samples have the appearance and texture of optically clear, isotropic, highly viscous gels. The microstructure of these cubic phases is such that the surfactant bilayer containing the paraffinic tails and the oil may be visualized as decorating a minimal surface so that the latter constitutes the mid-surface bisecting the bilayer. Linear rheology confirms that the dissipation becomes low at high acoustic frequencies and is consistent with the phenomenon of ″ringing″ in which underdamped shear modes in the gel couple to sound via the gel surface. The frequency-dependent rheology also reveals a universal scaling form at the melting transition of the cubic phase, with the dynamical scaling observed at this point reminiscent of a percolation transition. Nonlinear rheological response is consistent with the formation of dislocation or slip-planes in the cubic structure, parallel to the direction of shear. The experimental observations are related to the dynamics of the water/surfactant/oil interface, and theoretical ideas are presented to account for the observed behavior. Our results suggest that frequency dependent rheology is a useful structural probe of the dynamics of ternary cubic phases.

Original languageEnglish
Pages (from-to)61-67
Number of pages7
JournalLangmuir
Volume10
Issue number1
Publication statusPublished - Jan 1994
Externally publishedYes

Fingerprint

Rheology
rheology
Gels
gels
Surface-Active Agents
Oils
Surface active agents
oils
surfactants
shear
minimal surfaces
scaling
acoustic frequencies
octanes
bromides
Melting
slip
dissipation
textures
Textures

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Radiman, S., & Toprakcioglu, C. (1994). Rheological study of ternary cubic phases. Langmuir, 10(1), 61-67.

Rheological study of ternary cubic phases. / Radiman, Shahidan; Toprakcioglu, C.

In: Langmuir, Vol. 10, No. 1, 01.1994, p. 61-67.

Research output: Contribution to journalArticle

Radiman, S & Toprakcioglu, C 1994, 'Rheological study of ternary cubic phases', Langmuir, vol. 10, no. 1, pp. 61-67.
Radiman S, Toprakcioglu C. Rheological study of ternary cubic phases. Langmuir. 1994 Jan;10(1):61-67.
Radiman, Shahidan ; Toprakcioglu, C. / Rheological study of ternary cubic phases. In: Langmuir. 1994 ; Vol. 10, No. 1. pp. 61-67.
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