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    Chemical Oscillation Induced Periodic Swelling and Shrinking of a Polymeric Multilayer Investigated with a Quartz Crystal Microbalance

    Year: 2008

    Journal: Langmuir, 24 (16), 8929–8933, 2008, 20100827

    Authors: Tang Y., Liu G., Yu C., Wei X., Zhang G *

    Last authors: Guangzhao Zhang

    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-co-3-azidopropyl acrylate) and poly(acrylic acid-co-propargyl acrylate) have been alternately fabricated into a multilayer via the click reaction. The layer-by-layer deposition was monitored with a quartz crystal microbalance with dissipation (QCM-D) in real time. The response of the multilayer under continuous flow of a bromate−sulfite−ferrocyanide solution with pH oscillation has also been investigated by use of QCM-D. As the pH oscillates between 3.1 and 6.6, either the frequency shift (Δf) or the dissipation shift (ΔD) periodically varies with a constant amplitude, clearly indicating that the multilayer swells and shrinks oscillatedly. The changes of thickness, shear viscosity, and elastic shear modulus further indicate the oscillation.