Charge induced pattern formation on surfaces

Segregation in cylindrical micelles of cationic-anionic peptide-amphiphiles

F. J. Solis, Samuel I Stupp, M. Olvera De La Cruz

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Micelles, vesicles, and films composed of two species of incompatible heterogenous molecules exhibit full internal segregation of the component species. This macroscopic segregation can be inhibited by oppositely charging the two different molecular species. The degree of compatibility achieved by the charges leads to either fully homogenous mixtures or to local segregation and the possible formation of regular patterns. We investigate the induction of periodic surface patterns by the presence of opposite charges in flat films and cylindrical micelles. In the strong segregation limit the incompatibility between species can be described by a line tension parameter γ. The size of the patterns formed is of the order of a characteristic size L∼(γ/σ 2) 1/2, where σ is the surface charge density. The pattern symmetry on flat surfaces is function only of the fraction of area covered by the components, f: lamellar for 0.34

Original languageEnglish
Article number054905
JournalJournal of Chemical Physics
Volume122
Issue number5
DOIs
Publication statusPublished - 2005

Fingerprint

Surface segregation
Amphiphiles
Micelles
peptides
micelles
Peptides
Surface charge
Charge density
incompatibility
Molecules
compatibility
charging
flat surfaces
induction
symmetry
molecules

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Charge induced pattern formation on surfaces : Segregation in cylindrical micelles of cationic-anionic peptide-amphiphiles. / Solis, F. J.; Stupp, Samuel I; De La Cruz, M. Olvera.

In: Journal of Chemical Physics, Vol. 122, No. 5, 054905, 2005.

Research output: Contribution to journalArticle

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