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Related Experiment Videos

Dynamics of pattern coarsening in a two-dimensional smectic system.

Christopher Harrison1, Zhengdong Cheng, Srinivasan Sethuraman

  • 1Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 21, 2002
PubMed
Summary

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We studied how block copolymer microdomains coarsen in thin films. Disclination dynamics, observed via microscopy, revealed power-law growth and annihilation mechanisms, offering insights into pattern formation in various systems.

Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Polymer Science

Background:

  • Block copolymer thin films exhibit complex microdomain structures.
  • Coarsening dynamics are crucial for understanding pattern evolution and stability.
  • Two-dimensional smectic systems provide a model for studying defect-driven coarsening.

Purpose of the Study:

  • To investigate the coarsening dynamics of cylindrical block copolymer microdomains in a single layer.
  • To quantify the growth of the orientational correlation length.
  • To identify and characterize the mechanisms of disclination annihilation.

Main Methods:

  • Utilized scanning electron microscopy (SEM) to measure orientational correlation length.
  • Employed time-lapse atomic force microscopy (AFM) to track disclination behavior during annealing.

Related Experiment Videos

  • Analyzed power-law relationships between correlation length and time.

    • Main Results:

    • Observed orientational correlation length growth following a power law, xi2(t) ~ t(1/4).
    • Identified dominant disclination annihilation mechanisms involving tripoles and quadrupoles.
    • Demonstrated that multi-disclination annihilation events lead to reduced kinetic exponents.

    Conclusions:

    • The coarsening dynamics of block copolymer microdomains are governed by defect annihilation processes.
    • The observed power-law scaling and annihilation mechanisms are relevant to other systems with striped patterns.
    • This study provides a fundamental understanding of pattern formation and evolution in soft materials.