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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Low-radii transitions in co-assembled cationic-anionic cylindrical aggregates.

Marc Michael Del Rosario Lim1, Yuri S Velichko, Monica Olvera de la Cruz

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.

The Journal of Physical Chemistry. B
|April 9, 2008
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Summary

Charged patterns on cylindrical micelles form due to competing forces. The Bjerrum length controls transitions between helical, ring, and isotropic patterns, revealing a critical surface for phase changes.

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Area of Science:

  • Supramolecular chemistry
  • Colloid and interface science
  • Computational physics

Background:

  • Cylindrical micelles formed from co-assembled cationic and anionic amphiphiles exhibit complex surface charge patterns.
  • The interplay between molecular incompatibility (chi) and electrostatic interactions dictates pattern formation, preventing macroscopic phase separation.

Purpose of the Study:

  • To investigate the formation of charged surface patterns on cylindrical micelles.
  • To analyze the influence of the Bjerrum length (lB) on pattern transitions (helical, ring, isotropic).
  • To identify critical parameters governing these phase transitions.

Main Methods:

  • Monte Carlo simulations were employed to study micelle surface domains at thermal equilibrium.
  • The study systematically varied the Bjerrum length (lB), cylinder radius (R), and incompatibility parameter (chi).

Main Results:

  • A critical surface in the parameter space (lB, R, chi) was identified, separating helical, ring, and isotropic patterns.
  • The transition between these patterns was shown to correspond to a first-order phase transition.
  • The Bjerrum length (lB) was confirmed as a key parameter controlling the helical-ring transition.

Conclusions:

  • The Bjerrum length significantly influences the type of charged pattern formed on cylindrical micelles.
  • Ring patterns are associated with short-range forces, while helical patterns arise from dominant long-range electrostatic interactions.
  • Understanding these parameters is crucial for controlling self-assembly in complex fluid systems.