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Growth behaviour and mechanical properties of PLL/HA multilayer films studied by AFM

Üzüm, Cagri ; Hellwig, Johannes ; Madaboosi, Narayanan ; Volodkin, Dmitry ; Klitzing, Regine von (2021):
Growth behaviour and mechanical properties of PLL/HA multilayer films studied by AFM. (Publisher's Version)
In: Beilstein Journal of Nanotechnology, 3, pp. 778-788. Beilstein-Institut, ISSN 2190-4286,
DOI: 10.26083/tuprints-00019041,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Growth behaviour and mechanical properties of PLL/HA multilayer films studied by AFM
Language: English
Abstract:

Scanning- and colloidal-probe atomic force microscopy were used to study the mechanical properties of poly(L-lysine)/hyaluronan (PLL/HA)n films as a function of indentation velocity and the number of polymer deposition steps n. The film thickness was determined by two independent AFM-based methods: scratch-and-scan and newly developed full-indentation. The advantages and disadvantages of both methods are highlighted, and error minimization techniques in elasticity measurements are addressed. It was found that the film thickness increases linearly with the bilayer number n, ranging between 400 and 7500 nm for n = 12 and 96, respectively. The apparent Young’s modulus E ranges between 15 and 40 kPa and does not depend on the indenter size or the film bilayer number n. Stress relaxation measurements show that PLL/HA films have a viscoelastic behaviour, regardless of their thickness. If indentation is performed several times at the same lateral position on the film, a viscous/plastic deformation takes place.

Journal or Publication Title: Beilstein Journal of Nanotechnology
Journal volume: 3
Publisher: Beilstein-Institut
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 03 Sep 2021 12:43
Last Modified: 03 Sep 2021 12:43
DOI: 10.26083/tuprints-00019041
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-190416
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19041
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