About: Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion

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Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1007/s10971-011-2559-8
Description	Pure maghemite nanopowders made up of nanocrystals with average size of 19 nm was prepared by a simple sol-gel self combustion process. The gel pH and the primer temperature turned out the key parameters for the obtaining of the maghemite phase, that often is accompanied by the most thermodynamically stable hematite. Pure maghemite was achieved only with a gel pH value of 7 and with a primer temperature between 290 and 325 A degrees C. XRD and IR pointed out the formation of maghemite with tetragonal structure and HRTEM indicated the high degree of crystallinity of the powder. Mossbauer measurements allowed to confirm the presence of maghemite phase with Fe(octa):Fe(tetra) ratio of 1.62 which is very close to the theoretical value and the presence spin canting strongly dependent on applied magnetic field. This picture is confirmed by dc magnetic measurements. Pure maghemite nanopowders made up of nanocrystals with average size of 19 nm was prepared by a simple sol-gel self combustion process. The gel pH and the primer temperature turned out the key parameters for the obtaining of the maghemite phase, that often is accompanied by the most thermodynamically stable hematite. Pure maghemite was achieved only with a gel pH value of 7 and with a primer temperature between 290 and 325 A degrees C. XRD and IR pointed out the formation of maghemite with tetragonal structure and HRTEM indicated the high degree of crystallinity of the powder. Mossbauer measurements allowed to confirm the presence of maghemite phase with Fe(octa):Fe(tetra) ratio of 1.62 which is very close to the theoretical value and the presence spin canting strongly dependent on applied magnetic field. This picture is confirmed by dc magnetic measurements. (en)
Title	Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion (en)
skos:prefLabel	Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion (en)
skos:notation	RIV/00216208:11310/11:10108461!RIV12-MSM-11310___
http://linked.open...avai/predkladatel	Přírodovědecká fakulta
http://linked.open...avai/riv/aktivita	I
http://linked.open...avai/riv/aktivity	I
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Nižňanský, Daniel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	229282
http://linked.open...ai/riv/idVysledku	RIV/00216208:11310/11:10108461
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	particles; autoignition; silica matrix; auto-combustion; cofe2o4 nanoparticles; magnetic-properties; citrate-nitrate gel; ferrite nanocrystalline powders; iron-oxide nanoparticles (en)
http://linked.open.../riv/klicoveSlovo	magnetic-properties auto-combustion autoignition citrate-nitrate gel cofe2o4 nanoparticles ferrite nanocrystalline powders silica matrix iron-oxide nanoparticles particles
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[6B1CFA5BFBA7]
http://linked.open...i/riv/nazevZdroje	Journal of Sol-Gel Science and Technology
http://linked.open...in/vavai/riv/obor	CA
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	60
http://linked.open...iv/tvurceVysledku	Nižňanský, Daniel Ardu, A. Cannas, C. Musinu, A. Peddis, D. Piccaluga, G.
http://linked.open...ain/vavai/riv/wos	000298012100008
issn	0928-0707
number of pages	9 (xsd:int)
http://bibframe.org/vocab/doi	10.1007/s10971-011-2559-8
http://localhost/t...ganizacniJednotka	11310
is http://linked.open...avai/riv/vysledek of	Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion Simple and fast preparation of pure maghemite nanopowders through sol-gel self-combustion

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