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Phase separation in two-dimensional binary fluid mixtures: spontaneous pinning effect.

Yan-Li Tang1, Yu-Qiang Ma

  • 1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.

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|August 22, 2002
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Summary
This summary is machine-generated.

Phase separation dynamics in binary mixtures show composition-dependent domain growth. Asymmetric quenches reveal spontaneous pinning and pinning-depinning transitions, especially in polymer blends.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Physics

Background:

  • Phase separation is a fundamental process in binary mixtures.
  • Understanding domain growth dynamics is crucial for materials design.
  • Asymmetric quenches introduce complex behaviors in phase separation.

Purpose of the Study:

  • To investigate the dynamics of phase separation in binary mixtures under asymmetric quench conditions.
  • To explore the influence of relative composition on domain growth.
  • To identify and characterize pinning effects during phase separation.

Main Methods:

  • Molecular dynamics simulations were employed.
  • Two systems were studied: small molecular liquid mixtures and flexible chain blends.
  • Analysis focused on domain growth kinetics and structural transitions.

Main Results:

  • Domain growth is critically dependent on mixture composition.
  • A spontaneous pinning effect was observed near the critical value during percolation-to-cluster transitions.
  • Pinning-depinning transitions occurred with decreasing minority phase volume fraction due to correlated droplet motion.
  • Flexible polymer blends exhibited suppressed domain growth at late stages for asymmetric quenches, unlike small molecular systems.

Conclusions:

  • The study confirms composition-dependent domain growth dynamics in binary mixtures.
  • Intermittent or final pinning of phase separation is possible for isolated droplet structures.
  • Asymmetric quenches can lead to distinct late-stage growth behaviors in different material types.