print small

Participating Countries:

Australia

Austria

Belgium

Bulgaria

Canada

Cyprus

Czech Republic

Denmark

European Commission

France

Germany

Greece

Hungary

Ireland

Israel

Italy

Norway

Poland

Portugal

Romania

Russian Federation

Serbia

Slovakia

Slovenia

Spain

Sweden

Switzerland

Turkey

Ukraine

United Kingdom

United States of America

COST is supported by the EU Framework Programme Horizon 2020
This website is supported by COST

Ivan Stijepović

Early stage researcher* (ESR)/ Early Career Investigator (ECI)
PhD student
Period of mission: March 7-13 2016
Host institution: Jožef Stefan Institute, Ljubljana, Slovenia

Home institution:

Faculty of Technology, University of Novi Sad, Novi Sad, Serbia

Aim of the STSM was to use facilities and available equipment at the Institute Jožef Stefan to investigate ferrite and silica coated ferrite particles synthesised at the Faculty of Technology, Novi Sad, in order to determine their structural and functional properties. Nickel and zinc ferrite nanoparticles were synthesised using co-precipitation method and stabilised with citric acid (CA), poly(diallyl dimethylammonium)chloride (PDDA) and tetramethylammonium hydroxide. Then core/shell structure was made by adjusting zeta potential of as-synthesised particles by choosing appropriate stabilization compound. The other method was to synthesise nickel ferrite and then add zinc and iron nitrate salts in the reaction mixture and continue the synthesis. In this way, zinc ferrite shell would form on the core particles of nickel ferrite. Additionally, ferrite core particles with silica layer on top of them were obtained using Stöber process. All together, 16 different samples were used for magnetic measurements using vibrating sample magnetometry (VSM). Magnetization was measured in the range from -16 kG to 16 kG. Five samples were used for TEM investigations to determine structural characteristics of the synthesised nanoparticles. TEM results showed that samples mainly consisted of non-crystalline nickel ferrite with the presence of FeOOH secondary phase. This was consistent with magnetic measurements which showed that as-synthesised samples were paramagnetic. On the contrary, sample with NiFe2O4 core/ZnFe2O4 shell showed superparagnetic S-curve of magnetization. This indicates that prolonged synthesis time enables crystallization of NiFe2O4. All samples with silica shell were also paramagnetic.


Founding Members

Project Office

STSM



Subscribe to newsletter