Visualization of Critical pH-Controlled Gating of a Porous Membrane Grafted with Polyelectrolyte Brushes

DOI Web Site 被引用文献3件
  • Yoshihiro Ito
    PRESTO, Japan Science and Technology Cooperation Department of Material Chemistry Graduate School of Enginering, Kyoto University Kyoto 606-01, Japan
  • Yong Soon Park
    PRESTO, Japan Science and Technology Cooperation Department of Material Chemistry Graduate School of Enginering, Kyoto University Kyoto 606-01, Japan
  • Yukio Imanishi
    PRESTO, Japan Science and Technology Cooperation Department of Material Chemistry Graduate School of Enginering, Kyoto University Kyoto 606-01, Japan

説明

In the present study, the extension and contraction of the polymer chains in `polyelectrolyte brushes` grafted on a nanoporous polymeric membrane were visualized using atomic force microscopy, which enables direct microscopic observation in water. Pore size was estimated by measuring the rate of water permeation through the membrane. The rate of water permeation through an ungrafted membrane was independent of pH. The rate of permeation through the grafted membrane was found to be less than that of the ungrafted membrane, but was dependent upon pH. The rate was high at low pH, but was nearly zero at neutral pH. These changes in permeation were repeatedly carried out by pH changes, because the polyelectrolyte brush was covalently grafted on the membrane. 19 refs., 1 fig.

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