Single molecule spectroscopy reveals heterogeneous transport mechanisms for molecular ions in a polyelectrolyte polymer brush

Carmen Reznik, Nicel Estillore, Rigoberto C. Advincula, Christy F. Landes

研究成果: Article査読

28 被引用数 (Scopus)

抄録

Single molecule polarization and fluorescence correlation spectroscopy were used to evaluate heterogeneous transport mechanisms of molecular ions within supported polyelectrolyte brushes. Modes of diffusive transport include periods of significantly restricted rotational motion, often maintained over tens of milliseconds; periods of fast molecular rotation; and occasional adsorption of fluorescent probe molecules in the brush. The studies reveal rapid switching between orientational states during each observed mode of motion. Through quantitative analysis of state occupation times, the rate constants for transitions from weakly associated to strongly associated states were extracted. Additionally, the pH dependence of the ion transport rates in the brush exhibits an abrupt, rather than continuous, trend. These single molecule studies demonstrate the presence of dynamic anisotropic interactions between the charged molecular probe and the polymer brush and provide experimental evidence of stimuli responsive switchable transport functionality in the polyelectrolyte brush.

本文言語English
ページ(範囲)14611-14618
ページ数8
ジャーナルJournal of Physical Chemistry B
113
44
DOI
出版ステータスPublished - 2009 5月 11
外部発表はい

ASJC Scopus subject areas

  • 表面、皮膜および薄膜
  • 物理化学および理論化学
  • 材料化学

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