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Competition between interchain and intrachain phase segregation.

T Iwaki1, K Yoshikawa

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2003
PubMed
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Giant DNA molecules can transition between coil and globule states. This study explores conditions for intrachain phase segregation in polyelectrolytes, revealing stable states under specific electrostatic screening and interaction conditions.

Area of Science:

  • * Biophysics and Polymer Science
  • * Statistical Mechanics of Polymers

Background:

  • * Single-molecule studies reveal giant DNA transitions between elongated coil and compact globule states.
  • * Interchain phase segregation (coexistence of coil and globule states) is influenced by external factors like salt concentration and temperature.
  • * Recent findings indicate intrachain phase segregation (coexistence within a single chain) under specific conditions.

Purpose of the Study:

  • * To investigate general conditions promoting intrachain phase segregation in single polyelectrolyte molecules.
  • * To analyze the influence of condensed counterions and charged coiled regions on phase behavior.
  • * To establish the thermodynamic stability of intrachain phase segregation.

Main Methods:

  • * Development and application of a simple statistical model for polyelectrolyte behavior.

Related Experiment Videos

  • * Consideration of electrostatic interactions, including counterion condensation.
  • * Analysis of free energy to determine stable conformational states.

    • Main Results:

    • * Intrachain phase segregation is found to be thermodynamically stable within specific parameter ranges.
    • * Conditions favoring intrachain phase segregation include negligible electrostatic screening or strong screening with attractive segment interactions.
    • * The model provides insights into the interplay between molecular architecture and environmental factors.

    Conclusions:

    • * Intrachain phase segregation in polyelectrolytes is a general phenomenon achievable under defined conditions.
    • * Electrostatic screening strength and inter-segment interactions are critical determinants of phase behavior.
    • * This work advances the understanding of conformational transitions in single polymer chains.