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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
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Self-assembly of gemini surfactants: a computer simulation study.

Jagannath Mondal1, Mahesh Mahanthappa, Arun Yethiraj

  • 1Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.

The Journal of Physical Chemistry. B
|September 13, 2012
PubMed
Summary
This summary is machine-generated.

Gemini surfactants self-assemble into various liquid crystal phases, including unique gyroid structures. Molecular dynamics simulations reveal electrostatic stabilization and counterion effects on these complex nanostructures.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Gemini surfactants, featuring two tails linked by a flexible hydrophobic chain, exhibit complex self-assembly in aqueous solutions.
  • These surfactants form various lyotropic liquid crystalline phases, such as hexagonal, gyroid, and lamellar morphologies, dependent on concentration.

Purpose of the Study:

  • To investigate the aqueous self-assembly behavior of gemini dicarboxylate disodium surfactants using molecular dynamics simulations.
  • To understand the factors influencing the formation and stability of different lyotropic phases, particularly the gyroid phase.

Main Methods:

  • United atom molecular dynamics simulations were employed for the surfactant molecules.
  • Fully atomistic models were used for counterions (Na+) and water molecules.
  • Conformational analysis and phase behavior studies were conducted at varying amphiphile concentrations.

Main Results:

  • Simulations successfully reproduced experimentally observed lyotropic phases (hexagonal, gyroid, lamellar) at comparable amphiphile concentrations.
  • The study confirmed the unusual ability of these gemini surfactants to form gyroid phases over wide concentration ranges.
  • Quantitative agreement was achieved between simulated and experimental domain spacings of the nanostructured materials.
  • Electrostatic interactions were identified as key to the stabilization of the gyroid phase over the lamellar phase.
  • The use of bulkier counterions (N(CH3)4+) was shown to promote gyroid phase formation from a lamellar precursor.
  • Decreasing headgroup charge via protonation reduced the order in the lamellar phase.

Conclusions:

  • Molecular dynamics simulations provide a powerful tool for understanding gemini surfactant self-assembly and predicting phase behavior.
  • Electrostatic interactions and counterion identity significantly influence the formation and stability of lyotropic phases, especially the gyroid morphology.
  • The translational diffusion of water and counterions is strongly hindered by correlations with surfactant headgroups in concentrated solutions.