Mechanical properties of magnetic gels containing rod-like composite particles

Author:

Abrougui Mariem M.12,Lopez-Lopez Modesto T.3ORCID,Duran Juan D. G.3ORCID

Affiliation:

1. Centre National des Recherches en Sciences des Materiaux, Technopole Borej Cedria, BP 73, 8027 Soliman, Tunisia

2. Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunisie B.P. 94, Rommana 1068, Tunisia

3. Department of Applied Physics, Faculty of Sciences, University of Granada, 18071 Granada, Spain

Abstract

Magnetic gels (ferrogels) are heterogeneous systems structured at the nanoscale that contains magnetic particles dispersed in three-dimensional networks of polymer chains. In the present work, the magnetic particles were synthesized with a core–shell structure, consisting of sepiolite particles covered by magnetite nanoparticles. These composite particles had a rod-like shape with a high aspect ratio. The obtained sepiolite–magnetite particles showed a high enough susceptibility and saturation magnetization. The magneto-rheological (MR) properties, and the intensity of the MR effect, of aqueous suspensions of the synthesized particles were studied. The particles, functionalized by adsorption of alginate molecules, were imbedded in alginate hydrogels to get homogeneous soft materials. The particles were linked to the polymer chains as the knots in a network and dominated in a great extent the mechanical properties of the materials. After determining the optimal compositions of the ferrogels, their viscoelastic properties were measured in the absence/presence of magnetic fields. The results pointed out that the MR effect provided by the clay–magnetite particles was considerably more intense than those achieved in ferrogels that contain spherical magnetic microparticles. Therefore, the imbedding of rod-shaped magnetic particles in hydrogels allows controlling the mechanical properties in a wider range than in conventional ferrogels. This article is part of the theme issue ‘Heterogeneous materials: metastable and non-ergodic internal structures’.

Funder

Ministerio de Economía, Industria y Competitividad, MINECO, and Agencia Estatal de Investigación, AEI, Spain,

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

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