KAJIAN SIFAT KEMAGNETAN NANOPARTIKEL COPPER FERRITE(CuFe2O4) YANG DIENKAPSULASI DENGAN POLYETHYLENE GLYCOL(PEG-4000) DAN SILIKA (SiO2); INVESTIGATION OF MAGNETIC PROPERTIES OF COPPER FERRITE (CuFe2O4) NANOPARTICLES COATED BY POLYETHYLENE GLYCOL (PEG-4000) AND SILICA (SiO2)

Pauzan, Muh, Edi Suharyadi

2015 | Disertasi | FMIPA

04141CuFe2O4 magnetic nanoparticles have been synthesized by coprecipitation method. Polyethylene glycol (PEG-4000) and silica(precursor: Na2SiO3)was used to encapsulate the nanoparticles. PEG-4000 was varied the concentration of CuFe2O4nanoparticles for 6variations such as25, 33, 50, 66, 75, and 80%.Na2SiO3concentration was varied in distilled water such as5, 10, 15, 20, 30, and 50%. Characterization by using X-Ray Diffractometer (XRD) showed that PEG encapsulated CuFe2O4formed ?-FeO(OH), which is antiferromagnetic and ?-FeO (OH) which isparamagnetic. Furthermore PEG and silica encapsulated CuFe2O4nanoparticles obtained samples with a higher degree of crystallinity, encapsulationinhibit oxidation on CuFe2O4surfaceas well. Fourier Transform Infrared Spectroscopy (FTIR) spectra confirmedthat the CuFe2O4nanoparticles successfully encapsulated by PEG-4000 and silica. Hysteresis loops obtained fromVibrating Sample Magnetometer (VSM) shows thatCuFe2O4response to the external magnetic field is reducedafter encapsulation with PEG and silica. Although PEG and silica have variation of concentrations, the coercivity (

Kata Kunci : CuFe2O4nanoparticles; encapsulation; PEG-4000; silica; magnetization; coercivity.