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Issue 13, 2009
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Static and dynamic structural probing of swollen polyacrylamide ferrogels

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Abstract

The local structure of hybrid ferrogels resulting from the incorporation of γ-Fe2O3 nanoparticles into a polyacrylamide polymeric network is probed from a static and a dynamic point of view, under various synthesis conditions and at swelling equilibrium. Relaxation of magneto-optical birefringence and small-angle neutron scattering measurements show adsorption of the nanoparticles onto the polymer, which is ascribed to H-bonding. These measurements allow one to identify the conditions leading either to a homogeneous scaffold reinforced by the nanoparticles, or to a nano-structured composite with 2D nanoparticle decoration on the walls of percolating pockets, initially filled by the ferrofluid during the synthesis and leaking out during the swelling. Two parameters rule the structure and the properties of these ferrogels – the osmotic pressure ratio RΠ (ratio of the osmotic pressure of the initial ferrofluid to that of the hydrogel) and the steric parameter RS (ratio of the nanoparticle volume to the mesh volume of the polymeric hydrogel).

Graphical abstract: Static and dynamic structural probing of swollen polyacrylamide ferrogels

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Supplementary files

Article information


Submitted
30 Oct 2008
Accepted
03 Apr 2009
First published
15 May 2009

Soft Matter, 2009,5, 2614-2624
Article type
Paper

Static and dynamic structural probing of swollen polyacrylamide ferrogels

J. A. Galicia, F. Cousin, E. Dubois, O. Sandre, V. Cabuil and R. Perzynski, Soft Matter, 2009, 5, 2614
DOI: 10.1039/B819189A

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