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Cloud point phenomena for POE-type nonionic surfactants in a model room temperature ionic liquid.

Tohru Inoue1, Takeshi Misono

  • 1Department of Chemistry, Faculty of Science, Fukuoka University, Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan. inouetr@fukuoka-u.ac.jp

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The cloud point of nonionic surfactants in ionic liquids depends on surfactant chain length, with longer polyoxyethylene chains increasing the cloud point and longer hydrocarbon chains decreasing it. This behavior differs significantly from aqueous systems.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surfactant Science

Background:

  • The cloud point phenomenon is crucial for understanding phase behavior in surfactant solutions.
  • Ionic liquids (ILs) offer unique solvent properties distinct from conventional solvents like water.
  • Polyoxyethylene (POE)-type nonionic surfactants exhibit temperature-dependent solubility.

Purpose of the Study:

  • Investigate the cloud point phenomenon of POE-type nonionic surfactants in a room temperature ionic liquid (RTIL).
  • Determine the influence of surfactant polyoxyethylene and hydrocarbon chain lengths on the cloud point in RTILs.
  • Compare the surfactant behavior in RTILs with that in aqueous systems.

Main Methods:

  • Cloud point measurements for various POE-type nonionic surfactants (C(12)E(5), C(12)E(6), C(12)E(7), C(10)E(6), C(14)E(6)) in 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF(4)).
  • Analysis of the dependence of cloud point (T(c)) on surfactant chain lengths.
  • Application of a Flory-Huggins-type model to analyze cloud point curves and phase separation.

Main Results:

  • Cloud point (T(c)) increases with polyoxyethylene chain length and decreases with hydrocarbon chain length.
  • Surfactant solvophilicity/solvophobicity in RTIL is attributed to POE/hydrocarbon chains, respectively.
  • Chain length dependence of T(c) is significantly greater in RTILs than in aqueous systems, especially for hydrocarbon chains.
  • Micellar growth observed in RTIL solvent as temperature approaches T(c), similar to aqueous systems.

Conclusions:

  • The study elucidates the distinct phase behavior of nonionic surfactants in ionic liquids compared to aqueous media.
  • The findings highlight the critical role of both polyoxyethylene and hydrocarbon chain lengths in dictating surfactant solubility in RTILs.
  • The observed phenomena can be modeled using polymer solution phase separation principles, adapted for surfactant-IL systems.