FABRIKASI DAN KARAKTERISASI STRUKTUR KRISTAL DAN SIFAT KEMAGNETAN NANOPARTIKEL COBALT FERRITE (CoFe2O4) BESERTA PROSES FUNGSIONALISASINYA DENGAN PEG-4000

• Main Authors: , Eko Arief Setiadi, , Dr. Edi Suharyadi M.Eng.
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2013
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/122997/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=63106
• Institution: Universitas Gadjah Mada

Magnetic nanoparticles of Cobalt Ferrite (CoFe2O4) have been synthesized by co-precipitation method with various synthesis temperatures, concentration of NaOH and stirring duration. The structural characteristics and particle�s size of CoFe2O4 were determined by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM), it showed that nanoparticles well crystallized with various grain size which depend on those synthesis parameters. The grains size estimated using the Scherrer formula were found that the grain size increased with increasing synthesis temperature, decreasing concentration of NaOH and decreasing stirring duration. Magnetic properties of CoFe2O4 nanoparticles analized by Vibrating Sample Magnetometer (VSM) showed that coercive field was decrease with the decreasing of particle size. But it is not for sample 8,844 and 8,898 nm because of agglomeration effect. The saturation and remanent magnetization increased with the increasing degree of crystallinity. But it also depends on presence of α-Fe2O3 phases and their grain size. Based on magnetic characterization analysis sample have been chosen with temperature 80°C, concentration of NaOH 5 M and stirring duration 120 minutes to modified with PEG-4000. XRD and TEM analysis showed that modification with PEG- 4000 given increasing degree of crystallinity, decreasing agglomeration and controlled shape to more spherical. VSM analysis showed that modification with PEG-4000 given decreasing saturation was predicted because of α-FeO(OH) and γ-FeO(OH) phases from bonds at interface of CoFe2O4 with PEG-4000 which shown at XRD and Furrier Transform Infra Red (FTIR) analysis.