Universität zu Köln

Roeder, Lisa, Bender, Philipp ORCID: 0000-0002-2492-3956, Tschoepe, Andreas, Birringer, Rainer and Schmidt, Annette M. (2012). Shear modulus determination in model hydrogels by means of elongated magnetic nanoprobes. J. Polym. Sci. Pt. B-Polym. Phys., 50 (24). S. 1772 - 1782. HOBOKEN: WILEY. ISSN 1099-0488

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Abstract

The mechanical characterization of complex soft matter by quasi-static magnetometry using nanoscopic magnetic probes is demonstrated for model hydrogels doped with two types of elongated magnetic nanoparticles. Chemically crosslinked poly(acrylamide) (PAAm) hydrogels serve as the matrix in which nickel nanorods or weakly magnetized hematite (a-Fe2O3) ellipsoids are embedded as local probes. We investigated the swelling behavior of the ferrogels in order to verify that their equilibrium swelling degree in water is not influenced by the probes, shows a good correlation with the FrenkelFloryRehner model. The proposed magnetomechanical method relies on a correlation between the shear modulus of the PAAm hydrogel matrix and the coercive fields of the corresponding isotropic ferrogels. By extending the StonerWohlfarth model for single-domain blocked magnetic particles by a term for particle rotation in an elastic matrix, information on the shear modulus of the matrix can be obtained. Comparison of the results with the expected relation from rubber elasticity theory illustrates both the general potential as well as the limits of the approach. (c) 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Roeder, Lisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Bender, Philipp UNSPECIFIED orcid.org/0000-0002-2492-3956 UNSPECIFIED Tschoepe, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Birringer, Rainer UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, Annette M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-478047
DOI:	10.1002/polb.23202
Journal or Publication Title:	J. Polym. Sci. Pt. B-Polym. Phys.
Volume:	50
Number:	24
Page Range:	S. 1772 - 1782
Date:	2012
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1099-0488
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLYACRYLAMIDE-GELS; POLYMER NETWORKS; COBALT FERRITE; MACROMOLECULES; MICRORHEOLOGY; MECHANICS; ALUMINA Multiple languages Polymer Science Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47804