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

Vikulina AS, Anissimov YG, Singh P, Prokopovic VZ, Uhlig K, Jaeger MS, Von Klitzing R, Duschl C, Volodkin D (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Physical Chemistry Chemical Physics Royal Society of Chemistry

Book Volume: 18

Pages Range: 7866-7874

Journal Issue: 11

DOI: 10.1039/c6cp00345a

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 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.

Authors with CRIS profile

Anna Vikulina

Involved external institutions

Technische Universität Berlin DE Germany (DE) Fraunhofer-Institut für Zelltherapie und Immunologie (IZI) DE Germany (DE) Griffith University AU Australia (AU) Nottingham Trent University GB United Kingdom (GB)

How to cite

APA:

Vikulina, A.S., Anissimov, Y.G., Singh, P., Prokopovic, V.Z., Uhlig, K., Jaeger, M.S.,... Volodkin, D. (2016). Temperature effect on the build-up of exponentially growing polyelectrolyte multilayers. An exponential-to-linear transition point. Physical Chemistry Chemical Physics, 18(11), 7866-7874. https://doi.org/10.1039/c6cp00345a

MLA:

Vikulina, Anna S., et al. "Temperature effect on the build-up of exponentially growing polyelectrolyte multilayers. An exponential-to-linear transition point." Physical Chemistry Chemical Physics 18.11 (2016): 7866-7874.

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