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  • Temperature effect on the build-up of exponentially growing polyelectrolyte multilayers. An exponential-to-linear transition point

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    Author(s)
    Vikulina, Anna S
    Anissimov, Yuri G
    Singh, Prateek
    Prokopovic, Vladimir Z
    Uhlig, Katja
    Jaeger, Magnus S
    von Klitzing, Regine
    Duschl, Claus
    Volodkin, Dmitry
    Griffith University Author(s)
    Anissimov, Yuri G.
    Year published
    2016
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    Abstract
    In this study, the effect of temperature on the build-up of exponentially growing polyelectrolyte multilayer films was investigated. It aims at understanding the multilayer growth mechanism as crucially important for the fabrication of tailor-made multilayer films. Model poly(L-lysine)/hyaluronic acid (PLL/HA) multilayers were assembled in the temperature range of 25–85 °C by layer-by-layer deposition using a dipping method. The film growth switches from the exponential to the linear regime at the transition point as a result of limited polymer diffusion into the film. With the increase of the build-up temperature the film ...
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    In this study, the effect of temperature on the build-up of exponentially growing polyelectrolyte multilayer films was investigated. It aims at understanding the multilayer growth mechanism as crucially important for the fabrication of tailor-made multilayer films. Model poly(L-lysine)/hyaluronic acid (PLL/HA) multilayers were assembled in the temperature range of 25–85 °C by layer-by-layer deposition using a dipping method. The film growth switches from the exponential to the linear regime at the transition point as a result of limited polymer diffusion into the film. With the increase of the build-up temperature the film growth rate is enhanced in both regimes; the position of the transition point shifts to a higher number of deposition steps confirming the diffusion-mediated growth mechanism. Not only the faster polymer diffusion into the film but also more porous/permeable film structure are responsible for faster film growth at higher preparation temperature. The latter mechanism is assumed from analysis of the film growth rate upon switching of the preparation temperature during the film growth. Interestingly, the as-prepared films are equilibrated and remain intact (no swelling or shrinking) during temperature variation in the range of 25–45 °C. The average activation energy for complexation between PLL and HA in the multilayers calculated from the Arrhenius plot has been found to be about 0.3 kJ mol−1 for monomers of PLL. Finally, the following processes known to be dependent on temperature are discussed with respect to the multilayer growth: (i) polymer diffusion, (ii) polymer conformational changes, and (iii) inter-polymer interactions.
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    Journal Title
    Physical Chemistry Chemical Physics
    Volume
    18
    Issue
    11
    DOI
    https://doi.org/10.1039/c6cp00345a
    Copyright Statement
    © The Author(s) 2016. This is an Open Access article distributed under the terms of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) License (https://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
    Subject
    Physical sciences
    Particle and high energy physics not elsewhere classified
    Chemical sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/142532
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    • Journal articles

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