AFM study of micelle chaining in surface films of poly styrene-block-poly (ethylene oxide) stars at the air/water interface

Jennifer L. Logan, Pascal Masse, Brian Dorvel, Andrew M. Skolnik, Sergei S. Sheiko, Raju Francis, Daniel Taton, Yves Gnanou, Randolph S. Duran*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

A series of three-arm star block copolymers were examined using atomic force microscopy (AFM). These stars consisted of a polystyrene core composed of ca. 111 styrene units/branch with poly(ethylene oxide) (PEO) chains at the star periphery. Each star contained different amounts of PEO, varying from 107 to 415 ethylene oxide units/branch. The stars were spread as thin films at the air/water interface on a Langmuir trough and transferred onto mica at various surface pressures. Circular domains representing 2D micelle-like aggregated molecules were observed at low pressures. Upon further compression, these domains underwent additional aggregation in a systematic manner, including micellar chaining. At this point, domain area and the number of molecules/domain increased with increasing pressure. In addition, it was found that longer PEO chains led to greater intermolecular separation and less aggregation. These AFM results correspond to attributes seen in the surface pressure - area isotherms of the stars. In addition, they demonstrate the viability of AFM as a quantitative characterization technique.

Original languageEnglish (US)
Pages (from-to)3424-3431
Number of pages8
JournalLangmuir
Volume21
Issue number8
DOIs
StatePublished - Apr 12 2005

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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