Title :
Magnetic probing of tunable Eu3+ local site in organic-inorganic nanohybrids
Author :
Amaral, V.S. ; Carlos, L.D. ; de Zea Bermudez, V.
Author_Institution :
Dept. de Fisica, Aveiro Univ., Portugal
fDate :
7/1/2001 12:00:00 AM
Abstract :
The magnetic properties of sol-gel derived Eu3+-doped organic/inorganic hybrid nanocomposites were studied. These hybrids consist of poly(oxyethylene)-based chains of variable length grafted onto siloxane nanodomains by urea cross-linkages. Results are presented for two chain length series, for which the local environment of Eu3+ ions and the urea-urea interactions induce distinct magnetic behaviors. For high Eu3+ content strong thermal irreversibility effects are found, due to the presence of Eu3+ magnetic interactions in the nanodomains
Keywords :
composite materials; crystal field interactions; europium; magnetic susceptibility; nanostructured materials; sol-gel processing; Eu3+-doped organic/inorganic hybrid nanocomposite; crystal field; di-ureasil; dipolar interaction; magnetic properties; poly(oxyethylene) chain length; siloxane nanodomain; sol-gel synthesis; thermal irreversibility; tunable local site; urea cross-linkage; urea-urea interaction; Biological materials; Magnetic domains; Magnetic materials; Magnetic properties; Magnetosphere; Nanobioscience; Nanocomposites; Optical materials; Polymers; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
