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Physical-chemical properties of CG and CG β-alkylglucosides. Phase diagrams and aggregate size/structure

Langmuir, ISSN: 0743-7463, Vol: 14, Issue: 15, Page: 4050-4058
1998
  • 87
    Citations
  • 0
    Usage
  • 25
    Captures
  • 0
    Mentions
  • 0
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    87
    • Citation Indexes
      87
  • Captures
    25

Article Description

The temperature versus concentration phase diagrams of the n-nonyl β-glucoside/water and the n-decyl β-glucoside/water systems are presented. The micellar region of the n-nonyl β-glucoside has been studied using H NMR self-diffusion to obtain information about the micellar size. Nonspherical aggregates are formed at concentrations immediately above the cmc. Three different liquid crystalline phases are formed as the concentration of n-nonyl β-glucoside is increased, viz. a hexagonal, a bicontinuous cubic (of space group Ia3d), and a lamellar phase. H NMR self-diffusion measurements have also been performed across the phase boundary separating the micellar and the cubic regions. It was found that there is no discontinuity in the surfactant self-diffusion when crossing this phase boundary. A particular feature of the n-decyl β-glucoside is the occurrence of a phase separation into two liquid isotropic solutions in the (total) surfactant concentration interval from approximately 0.1 to 17 wt% surfactant. The dilute and concentrated solutions have been examined by means of time-resolved fluorescence quenching (TRFQ). It was found that, at the lower phase boundary, nonspherical discrete aggregates are formed, whereas at the upper phase boundary (17 wt%), the aggregates are large. At high surfactant concentration (> 65 wt%), a lamellar liquid crystalline phase is formed. The liquid crystalline phases present in the two binary phase diagrams have been characterized by small-angle X-ray scattering (SAXS). The results have been analyzed in terms of repetition distances and surfactant head-group areas. An important result from the SAXS analysis is that the head-group area is an almost invariant parameter in the different liquid crystalline phases.

Bibliographic Details

Frederik Nilsson; Olle Söderman; Per Hansson; Ingegärd Johansson

American Chemical Society (ACS)

Materials Science; Physics and Astronomy; Chemistry

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