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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Multiple interfaces in diffusional phase transitions in binary mesogen-nonmesogen mixtures undergoing metastable

Ezequiel R Soulé1, Cyrille Lavigne, Linda Reven

  • 1Institute of Materials Science and Technology, INTEMA, University of Mar del Plata and National Research Council, CONICET, JB Justo 4302, 7600 Mar del Plata, Argentina.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

This study reveals a new mechanism for phase ordering in materials, where chemical demixing drives the transformation from a disordered to an ordered state via a double front. This finding is crucial for understanding complex fluid behavior.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Soft Matter Physics

Background:

  • Phase separation and ordering are fundamental processes in materials science.
  • Understanding the interplay between chemical demixing and phase ordering is key to controlling material properties.
  • Metastable states and their transitions are critical in complex systems.

Purpose of the Study:

  • To investigate simultaneous chemical demixing and phase ordering in a mixed order parameter system.
  • To explore a novel thermodynamically driven mechanism for phase transformation via a double front.
  • To analyze different kinetic regimes and their dependence on system parameters.

Main Methods:

  • Theoretical modeling of phase transitions.
  • Computer simulations of mixed order parameter systems.
  • Analysis of concentration profiles and kinetic regimes.

Main Results:

  • A previously unreported mechanism of phase ordering driven by chemical demixing via a double front was identified.
  • Different kinetic regimes were observed, influenced by initial conditions and mobility ratios.
  • Deviations from Fickian diffusion were linked to strong deviations from ideality due to coupled concentration and nematic ordering.

Conclusions:

  • The discovered double-front mechanism offers new insights into phase transitions in metastable systems.
  • The findings are relevant for liquid-crystalline nanocomposites and other mixtures exhibiting order-disorder transitions.
  • Couplings between concentration and ordering significantly impact mixture behavior and diffusion.