20.500.12556/DKUM-67029 Priprava Co-feritnih nanodelcev z ozko porazdelitvijo velikosti z metodo termičnega razpada oleatov Preparation of Co-ferrite nanoparticles with a narrow size distribution by the thermal decomposition of oleates 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. 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. kobaltov ferit nanodelci magnetni nanodelci cobalt ferrite nanoparticles magnetic nanoparticles true false true Slovenski jezik Angleški jezik Znanstveno delo 2017-07-27 11:07:29 2017-07-27 11:09:02 2022-08-01 13:27:49 2019-07-11 16:06:49 2008 0 0 str. 285-289 št. 6 Letn. 42 2008 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1580-2949 54 106193664 22329895 1580-2949 URN:SI:UM:DK:TSCRYCIO Materiali_in_Tehnologije_2008_Gyergyek,_Makovec,_Drofenik_Priprava_Co-feritnih_nanodelcev_z_ozko_porazdelitvijo_velikosti_z_metodo_termi.pdf Materiali_in_Tehnologije_2008_Gyergyek,_Makovec,_Drofenik_Priprava_Co-feritnih_nanodelcev_z_ozko_porazdelitvijo_velikosti_z_metodo_termi.pdf 1 C417AB7345DA1469703FC581AD0DBBB2 fd4b2d413b5eb08d85f714b935c4dd630ad01f819e25aa3548cc19e999da839c 73bd4a5e-7c0e-11eb-bb7a-00155d0001ca 20.500.12556/dkum/8cb41066-fecc-40cd-88ca-b108ef05f399 https://dk.um.si/Dokument.php?lang=slv&id=114569 http://mit.imt.si/Revija/izvodi/mit086/gyergyek.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=114568 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0