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    Periodic swelling and collapse of polyelectrolyte brushes driven by chemical oscillation

    Year: 2008

    Journal: J Phys Chem B. 2008 Aug 21;112(33):10137-41, 20100827

    Authors: Liu G, Zhang G.

    Last authors: Zhang G.

    Organizations: Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, China.

    Country: China

    Poly(acrylic acid) (PAA) chains exhibit conformational change in response to pH, whereas bromate-sulfite-ferrocyanide (BSF) solution shows pH oscillation between 3.2 and 6.6. By use of quartz crystal microbalance with dissipation (QCM-D), we have investigated the pH induced conformational change of PAA brushes under a continuous flow of BSF solution in real time. The changes in frequency and dissipation clearly indicate the periodic swelling and collapse of brushes with pH oscillation. The changes in thickness, viscosity, and elastic modulus further indicate the oscillation of the interface.