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Title:Priprava Co-feritnih nanodelcev z ozko porazdelitvijo velikosti z metodo termičnega razpada oleatov
Authors:ID Gyergyek, Sašo (Author)
ID Makovec, Darko (Author)
ID Drofenik, Mihael (Author)
ID Inštitut za kovinske materiale in tehnologije (Copyright holder)
Files:.pdf Materiali_in_Tehnologije_2008_Gyergyek,_Makovec,_Drofenik_Priprava_Co-feritnih_nanodelcev_z_ozko_porazdelitvijo_velikosti_z_metodo_termi.pdf (162,56 KB)
MD5: C417AB7345DA1469703FC581AD0DBBB2
PID: 20.500.12556/dkum/8cb41066-fecc-40cd-88ca-b108ef05f399
 
URL http://mit.imt.si/Revija/izvodi/mit086/gyergyek.pdf
 
Language:Slovenian
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:V prispevku opisujemo sintezo nanodelcev kobaltovega ferita z ozko porazdelitvijo velikosti z metodo termičnega razpada organskega kompleksa. Sinteza nanodelcev je potekala v dveh stopnjah. V prvi smo sintetizirali železov in kobaltov oleat z reakcijo kobaltovega (II) in železovega (III) klorida z natrijevim oleatom v mešanici topil. V drugi stopnji smo raztopino oleatov, ki smo ji dodali različne količine oleinske kisline, segreli do vrelišča topila (heksadeken 282 °C ali oktadeken 316 °C). Na povišani temperaturi oleati razpadejo in tvorijo oksidne nanodelce. Na nanodelce je vezan monomolekulski sloj oleinske kisline, ki omogoča dispergiranje nanodelcev v nepolarnih topilih. Povprečna velikost nanodelcev kobaltovega ferita je odvisna od temperature, časa siteze in količine dodane oleinske kisline. Sintetizirani nanodelci v območju velikosti med 9 nm in 20 nm izkazujejo ferimagnetno vedenje ter magnetne lastnosti, ki se spreminjajo s povprečno velikostjo nanodelcev. Predpostavili smo mehanizem nastanka nanodelcev kobaltovega ferita, ki vključuje koalescenco manjših nanodelcev in njihovo rekristalizacijo.
Keywords:kobaltov ferit, nanodelci, magnetni nanodelci
Publication status:Published
Publication version:Version of Record
Year of publishing:2008
Number of pages:str. 285-289
Numbering:Letn. 42, št. 6
PID:20.500.12556/DKUM-67029 New window
ISSN:1580-2949
UDC:54
ISSN on article:1580-2949
COBISS.SI-ID:22329895 New window
NUK URN:URN:SI:UM:DK:TSCRYCIO
Publication date in DKUM:27.07.2017
Views:1284
Downloads:133
Metadata:XML DC-XML DC-RDF
Categories:Misc.
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Secondary language

Language:English
Title:Preparation of Co-ferrite nanoparticles with a narrow size distribution by the thermal decomposition of oleates
Abstract:A synthesis method for the preparation of narrow-size-distribution Co-ferrite nanoparticles by thermal decomposition of oleates is presented. A two-step method was used to produce the nanoparticles. In the first step cobalt and iron oleates were synthesized by reacting iron (III) and cobalt (II) chlorides with sodium oleate in a mixture of solvents. In the second step the oleates solution, to which different amounts of oleic acid were added, was heated to the solvents’ boiling point (hexadecene 282 °C or oktadecene 316 °C). At elevated temperatures oleates decompose and oxide nanoparticles are formed. The nanoparticles are than coated with a mono-molecular layer of oleic acid, are hydrophobic and can be dispersed in non-polar organic solvents. The average size of the cobalt ferrite nanoparticles depends on the temperature, time of the synthesis and the concentration of oleic acid. In the size range between 9 nm and 20 nm the synthesized nanoparticles exhibited ferromagnetic behavior and size-dependent magnetic properties. A mechanism for the formation of cobalt ferrite nanoparticles with re-crystallization of nanoparticles composed of smaller nanoparticles is proposed.
Keywords:cobalt ferrite, nanoparticles, magnetic nanoparticles


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