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Gels 2016, 2(4), 30; doi:10.3390/gels2040030

Surface Morphology at the Microscopic Scale, Swelling/Deswelling, and the Magnetic Properties of PNIPAM/CMC and PNIPAM/CMC/Fe3O4 Hydrogels

1,2
and
1,2,*
1
Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, Via A. Moro 2, 53100 Siena, Italy
2
CRISMA, Via. Matteotti 15 Colle di Val d’Elsa, 53034 Siena, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Dirk Kuckling and David Díaz Díaz
Received: 19 September 2016 / Revised: 29 November 2016 / Accepted: 5 December 2016 / Published: 13 December 2016
(This article belongs to the Special Issue Stimuli-Responsive Gels)
View Full-Text   |   Download PDF [20022 KB, uploaded 13 December 2016]   |  

Abstract

Poly(N-isopropylacrylamide) (PNIPAM) hydrogels containing carboxymethylcellulose (CMC) and CMC/Fe3O4 nanoparticles were prepared. Free-radical polymerization with BIS as cross-linker was used to synthesize the hydrogels. The morphology at the microscopic scale of these materials was investigated using field emission scanning electron microscopy (FESEM). The images show that CMC in the PNIPAM hydrogels induces the formation of a honeycomb structure. This surface morphology was not observed for pure PNIPAM hydrogels prepared under similar conditions. The equilibrium swelling degree of the PNIPAM/CMC hydrogels (5200%) is much larger than that of the pure PNIPAM hydrogels (2500%). The water retention of PNIPAM/CMC hydrogels above the volume phase transition temperature is strongly reduced compared to that of pure PNIPAM hydrogel. Both PNIPAM/Fe3O4 and PNIPAM/CMC/Fe3O4 hydrogels exhibit a superparamagnetic behavior, but the blocking temperature (104 K) of the former is higher than that of the latter (83 K). View Full-Text
Keywords: hydrogels; thermoresponsive materials; magnetic nanoparticles; poly(N-isopropylacrylamide) (PNIPAM); field emission scanning electron microscopy (FESEM) hydrogels; thermoresponsive materials; magnetic nanoparticles; poly(N-isopropylacrylamide) (PNIPAM); field emission scanning electron microscopy (FESEM)
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MDPI and ACS Style

Uva, M.; Atrei, A. Surface Morphology at the Microscopic Scale, Swelling/Deswelling, and the Magnetic Properties of PNIPAM/CMC and PNIPAM/CMC/Fe3O4 Hydrogels. Gels 2016, 2, 30.

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