Low-radii transitions in co-assembled cationic-anionic cylindrical aggregates

Marc Michael Del Rosario Lim, Yuri S. Velichko, Monica Olvera De La Cruz, Graziano Vernizzi*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We investigate the formation of charged patterns on the surface of cylindrical micelles from co-assembled cationic and anionic amphiphiles. The competition between the net incompatibility χ (which arises from the different chemical nature of oppositely charged molecules) and electrostatic interactions (which prevent macroscopic segregation) results in the formation of surface domains. We employ Monte Carlo simulations to study the domains at thermal equilibrium. Our results extend previous work by studying the effect of the Bjerrum length lB at different values of the cylinder's radius R and χ and analyze how it affects the transition between helical, ring, and isotropic patterns. A critical surface in the space (lB, R, χ) separating these three phases is found, and we show how it corresponds to a first-order phase transition. This confirms that the Bjerrum length l B is a significant parameter in the control of the helical-ring transition; the ring pattern is strongly associated with short-range forces, whereas the helical pattern develops from dominant long-range electrostatic interactions.

Original languageEnglish (US)
Pages (from-to)5423-5427
Number of pages5
JournalJournal of Physical Chemistry B
Volume112
Issue number17
DOIs
StatePublished - May 1 2008

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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