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Simultaneous measurement of the Young's modulus and the Poisson ratio of thin elastic layers

Titelangaben

Gross, Wolfgang ; Kress, Holger:
Simultaneous measurement of the Young's modulus and the Poisson ratio of thin elastic layers.
In: Soft Matter. Bd. 13 (2017) . - S. 1048-1055.
ISSN 1744-6848
DOI: https://doi.org/10.1039/C6SM02470J

Volltext

Link zum Volltext (externe URL): Volltext

Abstract

The behavior of cells and tissue is greatly influenced by the mechanical properties of their environment. For studies on the interactions between cells and soft matrices, especially those applying traction force microscopy the characterization of the mechanical properties of thin substrate layers is essential. Various techniques to measure the elastic modulus are available. Methods to accurately measure the Poisson ratio of such substrates are rare and often imply either a combination of multiple techniques or additional equipment which is not needed for the actual biological studies. Here we describe a novel technique to measure both parameters, the Youngs's modulus and the Poisson ratio in a single experiment. The technique requires only a standard inverted epifluorescence microscope. As a model system, we chose cross-linked polyacrylamide and poly-N-isopropylacrylamide hydrogels which are known to obey Hooke's law. We place millimeter-sized steel spheres on the substrates which indent the surface. The data are evaluated using a previously published model which takes finite thickness effects of the substrate layer into account. We demonstrate experimentally for the first time that the application of the model allows the simultaneous determination of both the Young's modulus and the Poisson ratio. Since the method is easy to adapt and comes without the need of special equipment, we envision the technique to become a standard tool for the characterization of substrates for a wide range of investigations of cell and tissue behavior in various mechanical environments as well as other samples, including biological materials.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Professur Experimentalphysik VI - Biologische Physik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Professur Experimentalphysik VI - Biologische Physik > Professur Experimentalphysik VI - Biologische Physik - Univ.-Prof. Dr. Holger Kreß
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Profilfelder
Profilfelder > Advanced Fields
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 570 Biowissenschaften; Biologie
Eingestellt am: 26 Feb 2021 10:05
Letzte Änderung: 21 Jul 2023 06:22
URI: https://eref.uni-bayreuth.de/id/eprint/63457