Magnetic and Mossbauer studies of magnetite-loaded polyvinyl alcohol hydrogels

Dénes Szabó, Ilona Czakó-Nagy, Miklós Zrínyi, Attila Vértes

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Materials producing strain in a magnetic field are known as magnetoelastic or magnetostrictive materials. A new type of material that is able to produce giant strain in a nonhomogeneous magnetic field has been developed. In these magnetic-field-sensitive gels (ferrogels) fine colloidal particles having superparamagnetic behavior are incorporated into a highly swollen elastic polymer network. Magnetic properties of ferrogels have been investigated using electron microscopy, static magnetization measurements, and Mossbauer spectroscopy. Analysis of the data yielded information on the superparamagnetic behavior of ferrogels and made it possible to estimate the size distribution of the magnetic cores of magnetite particles made by chemical precipitation and built into a chemically cross-linked polyvinyl alcohol matrix. The results are interpreted on the basis of a core-shell model. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)166-172
Number of pages7
JournalJournal of colloid and interface science
Volume221
Issue number2
DOIs
Publication statusPublished - Jan 15 2000

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Keywords

  • Ferrogels
  • Filled hydrogels
  • Magnetic nanoparticles
  • Surface magnetism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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