Oleate-based hydrothermal preparation of CoFe2O4 nanoparticles, and their magnetic properties with respect to particle size and surface coating

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F15%3A10296221" target="_blank" >RIV/00216208:11310/15:10296221 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/15:00448155 RIV/61389013:_____/15:00448155

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jmmm.2015.04.090" target="_blank" >http://dx.doi.org/10.1016/j.jmmm.2015.04.090</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmmm.2015.04.090" target="_blank" >10.1016/j.jmmm.2015.04.090</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Oleate-based hydrothermal preparation of CoFe2O4 nanoparticles, and their magnetic properties with respect to particle size and surface coating

Popis výsledku v původním jazyce

We present a facile and high yield synthesis of cobalt ferrite nanoparticles by hydrothermal hydrolysis of Co-Fe oleate in the presence of pentanol/octanol/toluene and water at 180 or 220 degrees C. The particle size (610 nm) was controlled by the composition of the organic solvent and temperature. Magnetic properties were then investigated with respect to the particle size and surface modification with citric acid or titanium dioxide (leading to hydrophilic particles). The as prepared hydrophobic nanoparticles (coated by oleic acid) had a minimum inter-particle distance of 2.5 nm. Their apparent blocking temperature (estimated as a maximum of the zero-field-cooled magnetization) was 180 K, 280 K and 330 K for the particles with size of 6,0 and 10.5 nm, respectively. Replacement of oleic acid on the surface by citric acid decreased inter particle distance to less than 1 nm, and increased blocking temperature by ca. 10 K. On the other hand, coating with Uranium dioxide, supported by nit

Název v anglickém jazyce

Oleate-based hydrothermal preparation of CoFe2O4 nanoparticles, and their magnetic properties with respect to particle size and surface coating

Popis výsledku anglicky

We present a facile and high yield synthesis of cobalt ferrite nanoparticles by hydrothermal hydrolysis of Co-Fe oleate in the presence of pentanol/octanol/toluene and water at 180 or 220 degrees C. The particle size (610 nm) was controlled by the composition of the organic solvent and temperature. Magnetic properties were then investigated with respect to the particle size and surface modification with citric acid or titanium dioxide (leading to hydrophilic particles). The as prepared hydrophobic nanoparticles (coated by oleic acid) had a minimum inter-particle distance of 2.5 nm. Their apparent blocking temperature (estimated as a maximum of the zero-field-cooled magnetization) was 180 K, 280 K and 330 K for the particles with size of 6,0 and 10.5 nm, respectively. Replacement of oleic acid on the surface by citric acid decreased inter particle distance to less than 1 nm, and increased blocking temperature by ca. 10 K. On the other hand, coating with Uranium dioxide, supported by nit

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Magnetism and Magnetic Materials

ISSN

0304-8853

e-ISSN

—

Svazek periodika

390

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

142-151

Kód UT WoS článku

000355141200024

EID výsledku v databázi Scopus

2-s2.0-84928682112