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Structural transitions of a semi-flexible polyampholyte.

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Polyelectrolytes called polyampholytes (PAs) change shape from coil to globule based on their charge sequence. Their dynamics vary with sequence and flexibility, revealing distinct behaviors like bundles and torus structures.

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Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Computational Chemistry

Background:

  • Polyampholytes (PAs) are polymers with both positive and negative charges.
  • Their conformation and dynamics depend on monomer sequence and chain flexibility.
  • Understanding PA behavior is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the structural and dynamical properties of flexible and semi-flexible polyampholytes.
  • To explore how charge sequence and bending rigidity influence PA conformations.
  • To characterize the dynamics of PAs under varying conditions, including hydrodynamic interactions.

Main Methods:

  • Coarse-grained molecular dynamics simulations were employed.
  • Analysis included mean-square displacement (MSD) and shape factor calculations.
  • The study systematically varied bending rigidity and electrostatic interaction strength (Γe).

Main Results:

  • Flexible PAs transition from coil to globule conformations based on charge sequence.
  • Distinct dynamics were observed for alternating and charge-segregated sequences, with varying exponents (β) in MSD power-law behavior.
  • Semi-flexible PAs exhibited globule, bundle, torus, circular, and hairpin-like conformations depending on rigidity and Γe.

Conclusions:

  • The charge sequence is a key determinant of flexible PA conformation and dynamics.
  • Hydrodynamic interactions significantly alter PA dynamics, especially for alternating sequences.
  • Bending rigidity and electrostatic interactions drive diverse conformational transitions in semi-flexible PAs, offering tunable material properties.