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Related Experiment Videos

Kinetic pathway to double-gyroid structure.

M Imai1, K Sakai, M Kikuchi

  • 1Department of Physics, Faculty of Science, Ochanomizu University, Otsuka, Bunkyo, Tokyo 112-8610, Japan. imai@phys.ocha.ac.jp

The Journal of Chemical Physics
|June 25, 2005
PubMed
Summary
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Investigating surfactant/water systems reveals the double-gyroid phase transition pathways. The hexagonal perforated lamellar structure (HPLABC) acts as a crucial intermediate, guiding transitions despite topological challenges.

Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Supramolecular Chemistry

Background:

  • Nonionic surfactant/water systems exhibit complex phase behavior.
  • Understanding order-order transitions is key to controlling mesophase formation.
  • The double-gyroid (DG) phase is a complex, highly ordered structure.

Purpose of the Study:

  • To elucidate the structural pathways during order-order transitions to the double-gyroid (DG) phase.
  • To identify intermediate structures in surfactant/water systems.
  • To analyze the role of stacking sequences in phase transitions.

Main Methods:

  • Utilizing two-dimensional small-angle X-ray scattering (2D SAXS).
  • Analyzing highly oriented, ordered mesophases.

Related Experiment Videos

  • Investigating transitions from lamellar (L) and hexagonal cylinder (H) phases.

    • Main Results:

    • The lamellar (L) to DG transition involves fluctuating perforated layer (ABAB) and hexagonal perforated lamellar (HPLABC) structures.
    • The HPLABC structure is a common intermediate for both L to DG and H to DG transitions.
    • Transition from HPL to DG involves rotation of dihedral angles; HPLAB to DG is direct, while HPLABC to DG requires significant deformation.

    Conclusions:

    • The HPLABC structure serves as a critical entrance structure for the DG phase.
    • Kinetic pathways to the DG phase can involve intermediate structures like HPLABC, despite topological constraints.
    • Structural intermediates provide insights into the mechanisms of complex phase transitions in soft matter.