Structure of cubic phases in ternary systems Glucopone/water/hydrocarbon

M. A. Siddig, Shahidan Radiman, S. V. Muniandy, L. S. Jan

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Phase diagrams for the ternary systems of Glucopone, water and several hydrocarbons are reported. Four different types of hydrocarbon are used namely; heptane, octane, dodecane and tetradecane. Small angle X-ray scattering (SAXS) and polarizing microscope are used for phase identification and structure characterization. The ternary systems are shown to form different liquid crystalline phases with the increase of concentration in the following order - cubic, hexagonal, and lamellar. The liquid crystalline phases present in the ternary phase diagrams have been characterized by SAXS and further analyzed in terms of lattice parameters and area per surfactant head-group. An optical isotropic gel phase with strong elastic properties is found in these systems and identified as cubic phase. The cubic phase is optically isotropic, transparent and highly viscous phase with three-dimensional structure. The cubic samples showed several diffraction peaks and can be assigned to the Ia3d space group. The rheological study on the cubic phase is performed. All cubic samples behave as solid-like material with storage modulus G′∼0.7×10 6Pa typical of cubic lyotropic materials. The effect of the oil concentration and oil types on the storage and loss moduli for the cubic liquid crystalline phases is examined. For all systems, the elastic modulus and the complex viscosity are found to increase with oil concentration while decrease with increasing the length of hydrocarbon chain. Tetradecane ternary system shows completely opposite behaviors. The elastic modulus decreased when the oil content is increased. The effect of temperature on the dynamic moduli of the systems is also studied. The systems show very sharp melting transition. Both, storage and loss modulus are found to decrease as the temperature increased. It was possible to deduce the influence of the alkane chain lengths in the phase and rheological behaviors of the Glucopone surfactant. Generally, the ternary systems show similar rheological behaviors except for tetradecane system, which found to show completely opposite behaviors. The cubic phase region is found to shift to higher oil content with the increase in the alkane chain length of hydrocarbon. Finally, it is worth to mention that no cubic phases are found with toluene and cyclohexane as oil phase.

Original languageEnglish
Pages (from-to)57-67
Number of pages11
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume236
Issue number1-3
DOIs
Publication statusPublished - 1 Apr 2004

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Ternary systems
Hydrocarbons
ternary systems
Oils
hydrocarbons
oils
Water
water
Alkanes
Elastic moduli
Crystalline materials
X ray scattering
Chain length
Surface-Active Agents
Paraffins
alkanes
Phase diagrams
modulus of elasticity
Liquids
Surface active agents

Keywords

  • Alkyl polyglucosides
  • Bicontinuous cubic phase
  • Phase behavior
  • Rheology
  • Small angle X-ray scattering

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Structure of cubic phases in ternary systems Glucopone/water/hydrocarbon. / Siddig, M. A.; Radiman, Shahidan; Muniandy, S. V.; Jan, L. S.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 236, No. 1-3, 01.04.2004, p. 57-67.

Research output: Contribution to journalArticle

Siddig, M. A. ; Radiman, Shahidan ; Muniandy, S. V. ; Jan, L. S. / Structure of cubic phases in ternary systems Glucopone/water/hydrocarbon. In: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2004 ; Vol. 236, No. 1-3. pp. 57-67.
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