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Mechanical Properties of Freestanding Polyelectrolyte Capsules : a Quantitative Approach Based on Shell Theory

Title data

Elsner, Nils ; Dubreuil, Frederic ; Weinkamer, Richard ; Wasicek, M. ; Fischer, F. D. ; Fery, Andreas:
Mechanical Properties of Freestanding Polyelectrolyte Capsules : a Quantitative Approach Based on Shell Theory.
In: Grundke, Karina ; Stamm, Manfred ; Adler, Hans-Jürgen (Hrsg.): Characterization of Polymer Surfaces and Thin Films. - Berlin : Springer-Verlag , 2006 . - pp. 117-123 . - (Progress in Colloid and Polymer Science ; 132 )
ISBN 978-3-540-35070-5
DOI: https://doi.org/10.1007/2882_022

Official URL: Volltext

Abstract in another language

In this paper we report on AFM force spectroscopy measure- ments on hollow polymeric spheres of colloidal dimensions made from polyelectrolyte multilayers of polyal- lylamine and polystyrenesulfonate in water. We find that the shells show a linear force-deformation characteristic for deformations of the order of the shell wall thickness. This experimental outcome is discussed in terms of analytical results of con- tinuum mechanics, in particular the scaling behaviour of the shell spring constant with wall thickness, shell radius and speed of the deformation is analysed. The experimental results agree well with the predictions of Reissner for thin shells and allow us to rescale our stiffness data such that a master curve of shell stiffness is obtained. The result of Reissner is strictly valid only for point like loading situations, while in our experiments a more extended plate like load is applied. Experimentally we find indeed little influence of the probe geometry on the shell spring constant. This result agrees well with finite element (FE) calculations that show that the Reissner result is a good approximation also for non point like loading situations, as long as small deformations are considered.

Further data

Item Type: Article in a book
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Physical Chemistry II - Univ.-Prof. Dr. Andreas Fery
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT: No
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 09 Dec 2014 07:38
Last Modified: 11 Feb 2015 09:31
URI: https://eref.uni-bayreuth.de/id/eprint/4031