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Spatial heterogeneity in a lyotropic liquid crystal with hexagonal phase.

David P Penaloza1, Koichiro Hori, Atsuomi Shundo

  • 1Department of Applied Chemistry, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan.

Physical Chemistry Chemical Physics : PCCP
|March 15, 2012
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Summary

Hexaethylene glycol (C(12)E(6)) surfactant solutions exhibit spatial heterogeneity. At 50 wt%, probe particles showed restricted diffusion, indicating distinct physical properties within hexagonal mesophases.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Non-ionic surfactants like hexaethylene glycol (C(12)E(6)) self-assemble in water to form various mesophases.
  • Understanding the physical properties and structural heterogeneity of these surfactant solutions is crucial for their applications.

Purpose of the Study:

  • To investigate the spatial heterogeneity in C(12)E(6)-water solutions.
  • To characterize the diffusion dynamics of probe particles within different mesophases, particularly the hexagonal phase.

Main Methods:

  • Utilized probe particle diffusion as a means to probe spatial heterogeneity.
  • Analyzed diffusion behavior in C(12)E(6)-water solutions at varying concentrations, focusing on the 50 wt% hexagonal mesophase.

Main Results:

  • Observed two distinct diffusion behaviors for probe particles in the 50 wt% C(12)E(6) hexagonal phase: normal diffusion and restricted diffusion.
  • The heterogeneous diffusion patterns suggest variations in the local physical properties within the mesophase.

Conclusions:

  • The hexagonal mesophase of C(12)E(6) in water is spatially heterogeneous.
  • This heterogeneity can be attributed to the coexistence of hexagonal domains and isotropic-like regions, influencing probe particle dynamics.