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Compositionally modulated phase in crystalline n-alkane mixtures.

E B Sirota1

  • 1Corporate Strategic Research, ExxonMobil Research and Engineering Company, Route 22 East, Annandale, New Jersey 08801, USA. Eric.B.Sirota@ExxonMobil.com

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 12, 2001
PubMed
Summary

Binary n-alkane mixtures form a unique microphase separated state (muPSS). This ordered structure, achieved via quenching, reveals alternating pure and mixed layers, potentially stabilized by molecular displacement entropy.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Physical Chemistry

Background:

  • Binary n-alkane mixtures can exhibit complex phase behaviors.
  • Microphase separation is a critical phenomenon in understanding material properties.

Purpose of the Study:

  • To investigate the structure of the compositionally modulated microphase separated state (muPSS) in binary n-alkane mixtures.
  • To elucidate the thermodynamic stability mechanism of the muPSS.

Main Methods:

  • X-ray scattering techniques were employed to study the muPSS.
  • A quenching method was utilized to obtain ordered reflections.

Main Results:

  • Sharp lamellar and superlattice reflections were observed, indicating a highly ordered superstructure.

Related Experiment Videos

  • The muPSS consists of alternating layers: pure C23H48 and C28H58-rich layers with some C23H48 and voids.
  • A regular arrangement of a monolayer of the minority component with one or more layers of the majority component was identified.

    • Conclusions:

    • The study provides detailed structural insights into the muPSS of n-alkane mixtures.
    • Thermodynamic stability of the muPSS may be linked to entropy from molecular longitudinal displacements.