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Self-assembly in linker-modified microemulsions.

Edgar J Acosta1, Jeffrey H Harwell, David A Sabatini

  • 1Chemical Engineering and Materials Science Department, Sarkeys Energy Center, University of Oklahoma, 100 East Boyd, room T-334, Norman, OK 73019, USA.

Journal of Colloid and Interface Science
|May 18, 2004
PubMed
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Combining lipophilic and hydrophilic linkers forms self-assembled surfactants in microemulsions. Middle phase microemulsions require a critical surfactant concentration, demonstrating their essential role in linker self-assembly.

Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Linker molecules enhance interactions in microemulsion systems.
  • Lipophilic and hydrophilic linkers may self-assemble at the oil/water interface.

Purpose of the Study:

  • Investigate linker self-assembly in microemulsions.
  • Determine the influence of surfactant, linker, and electrolyte concentrations on this phenomenon.

Main Methods:

  • Studied microemulsion systems with varying concentrations of surfactant (sodium dihexyl sulfosuccinate - SDHS), lipophilic linker (dodecanol), and hydrophilic linker (sodium mono- and dimethyl naphthalene sulfonate - SMDNS).
  • Measured critical micelle concentration (CMC) and critical middle phase microemulsion concentration (CmicroC).
  • Analyzed dodecanol adsorption behavior.

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Main Results:

  • Middle phase microemulsions form above a critical concentration (CmicroC), higher than the CMC.
  • Equimolar dodecanol and SMDNS required higher SDHS concentrations for middle phase formation compared to SDHS alone.
  • Dodecanol adsorption near surfactant tails followed Langmuir-type behavior, unaffected by electrolyte concentration but reduced near CmicroC.

Conclusions:

  • Self-assembly of hydrophilic and lipophilic linkers into middle phase microemulsions necessitates a minimum surfactant concentration.
  • Surfactant concentration plays a critical role in the formation and stability of these self-assembled systems.