Abstract
This study elucidates the tunability of the magnetic properties of cobalt spinel ferrites embedded in a polyvinyl alcohol (PVA) hydrogel by changing the structure of the polymer network. We report on the preparation and characterization of sPS-CoFe2O4 ferrofluid and PVA/sulfonated polystyrene (sPS)-CoFe2O4 ferrogels obtained by submitting the samples to a different number of freezing–thawing (F–T) cycles. The magnetic properties were evaluated and interpreted as a function of the PVA/sPS-CoFe2O4 composition and final structure of the ferrogels.
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F.M. Winnik, A. Morneau, R.F. Ziolo, H.D.H. Stover W.H. Li: Template-controlled synthesis of superparamagnetic goethite within macroporous polymeric microspheres. Langmuir 11, 3660 1995
R.F. Ziolo, E.P. Giannelis, B.A. Weinstein, M.P. O’Horo, B.N. Ganguly, V. Mehrotra, M.W. Russell D.R. Huffman: Matrix-mediated synthesis of nanocrystalline γ-Fe2O3. A new optically transparent magnetic material. Science 257, 219 1992
R.F. Ziolo, E.P. Giannelis R.D. Shull: Matrix-mediated synthesis and properties of nanostructured materials. Nanostruct. Mater. 3, 85 1993
R. Sanz, C. Luna, M. Hernandez-Velez, M. Vazquez, D. Lopez C. Mijangos: A magnetopolymeric nanocomposite: Co80Ni20 nanoparticles in a PVC matrix. Nanotechnology 16, 278 2005
K-F. Arndt, T. Schmidt, A. Richter D. Kuckling: High response smart gels: Synthesis and application. Macromol. Symp. 207, 257 2004
M.E. Byrne, K. Park N.A. Peppas: Molecular imprinting within hydrogels. Adv. Drug Del. Rev. 54, 149 2002
K. Dusek: Responsive Gels: Volume Transitions 1. Advances in Polymer Science, Vol. 109, Springer-Verlag Berlin 1993
E.S. Matsuo T. Tanaka: Patterns in shrinking gels. Nature 358, 482 1992
M. Zrinyi, L. Barsi, D. Szabo H.G. Kilian: Direct observation of abrupt shape transition in ferrogels induced by nonuniform magnetic field. J. Chem. Phys. 106, 5685 1997
M. Zrinyi, D. Szabo L. Barsi: Magnetic field sensitive polymeric actuators. J. Intell. Mater. Syst. Struct. 9, 667 1999
J. Chatterjee, Y. Haik C.J. Chen: Biodegradable magnetic gel: Synthesis and characterization. Colloid Polym. Sci. 281, 892 2003
L.L. Lao R.V. Ramanujan: Magnetic and hydrogel composite materials for hyperthermia applications. J. Mater. Sci.: Mater. Med. 15, 1061 2004
C.A. Finch: Polyvinyl Alcohol; Properties and Applications Wiley London New York 1973 622
H. Lin, Y. Watanabe, M. Kimura, K. Hanabusa H. Shirai: Preparation of magnetic poly(vinyl alcohol) (PVA) materials by in situ synthesis of magnetite in a PVA matrix. J. Appl. Polym. Sci. 87, 1239 2003
D. Lopez, I. Cendoya, F. Torres, J. Tejada C. Mijangos: Preparation and characterization of poly(vinyl alcohol)-based magnetic nanocomposites. 1. Thermal and mechanical properties. J. Appl. Polym. Sci. 82, 3215 2001
R. Hernandez, A. Sarafian, D. Lopez C. Mijangos: Viscoelastic properties of poly(vinyl alcohol) hydrogels and ferrogels obtained through freezing-thawing cycles. Polymer 45, 5543 2004
I. Cendoya, D. Lopez, A. Alegria C. Mijangos: Dynamic mechanical and dielectrical properties of poly(vinyl alcohol) and poly(vinyl alcohol)-based nanocomposites. J. Polym. Sci. Part B: Polym. Phys. 39, 1968 2001
C.M. Hassan N.A. Peppas: Structure and applications of poly(vinyl alcohol) hydrogels produced by conventional crosslinking or by freezing/thawing methods. Adv. Polym. Sci. 153, 37 2000
R. Hernandez, D. Lopez, C. Mijangos J-M. Guenet: A reappraisal of the “thermoreversible” gelation of aqueous poly(vinyl alcohol) solutions through freezing-thawing cycles. Polymer 43, 5661 2002
L.S. Suresh: Osmotic deswelling of polymer gels. J. Polym. Sci. Part B: Polym. Phys. 36, 2525 1998
ACKNOWLEGDMENTS
The authors are grateful to the CICYT(MAT 2002-2978 and MAT 2005-1179) for financial support. This work has been performed in the frame of NoE Nanofun-Poly EU contract No. NMP3-CT-2004-500361. The authors thank Prof. R. Turcu for fruitful discussions.
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Hernández, R., López, G., López, D. et al. Magnetic characterization of polyvinyl alcohol ferrogels and films. Journal of Materials Research 22, 2211–2216 (2007). https://doi.org/10.1557/jmr.2007.0298
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DOI: https://doi.org/10.1557/jmr.2007.0298