On the pH-responsive, charge-selective, polymer-brush-mediated transport probed by traditional and scanning fluorescence correlation spectroscopy

C. R. Daniels, L. J. Tauzin, E. Foster, R. C. Advincula, C. F. Landes

研究成果: Article査読

16 被引用数 (Scopus)

抄録

The complete and reversible charge-selective sequestration of fluorophores by a weak polyelectrolyte brush, poly(2-(dimethylamino)ethylmethacrylate) (PDMAEMA) was demonstrated using fluorescence correlation spectroscopy (FCS). The chemistry and thickness of the weak polyelectrolyte PDMAEMA was tuned reversibly between neutral and cationic polymer forms. Thus, by switching the pH successively, the brush architecture was tuned to selectively trap and release anionic dye probes while continuously excluding cationic molecules. In addition, line-scan FCS was implemented and applied for the first time to a synthetic polymer system and used to identify a new, slower diffusion time on the order of seconds for the sequestered anionic probe under acidic conditions. These results, which quantify the selective sequestration properties of the PDMAEMA brush, are important because they enable a better understanding of transport in polymers and establish a spectroscopic means of evaluating materials with proposed applications in separations science, charge storage/release, and environmental remediation.

本文言語English
ページ(範囲)4284-4290
ページ数7
ジャーナルJournal of Physical Chemistry B
117
16
DOI
出版ステータスPublished - 2013 4 25
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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