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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.
In: Beilstein Journal of Nanotechnology, 2012, 3
doi: 10.26083/tuprints-00019041
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Growth behaviour and mechanical properties of PLL/HA multilayer films studied by AFM
Language: English
Date: 2021
Place of Publication: Darmstadt
Year of primary publication: 2012
Publisher: Beilstein-Institut
Journal or Publication Title: Beilstein Journal of Nanotechnology
Volume of the journal: 3
DOI: 10.26083/tuprints-00019041
Corresponding Links:
Origin: Secondary publication service
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.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-190416
Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 03 Sep 2021 12:43
Last Modified: 15 Feb 2023 08:56
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19041
PPN: 504728652
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