Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS
Satoshi Iwata
Departement of Quantum Engineering, Nagoya University, Furo-cho chikusa-ku, Nagoya, Japan
Astronomy Energy Materials Science & Nanotechnology Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Sintesis Nanopartikel Cobalt Ferrite (CoFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Sifat Kemagnetannya Setiadi, Eko Arief; Shabrina, Nanda; Budi Utami, Hesti Retno; Fahmi, Nur Fadhilah; Kato, Takeshi; Iwata, Satoshi; Suharyadi, Edi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 3, No 01 (2013): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v3i01.1216

Abstract

Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized by co-precipitation method with various synthesis temperature and concentration of NaOH. The structural characteristics and particle size of CoFe2O4 were determined by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM), its showed that nanoparticles well crystallized with various grain size which depend on synthesis parameters. The grain sizes estimated using the Scherrer formula were found that the grain size increased with increasing temperature synthesis and decreasing concentration of NaOH. Magnetic characterization of CoFe2O4 nanoparticles was investigated by using a Vibrating Sample Magnetometer (VSM). Sample with various concentration of NaOH showed that coercivity was decrease with the decrease of particle size. In other hand, samples with various synthesis temperature found that sample withsmallest grain size have high coersivity. The saturation magnetization increase when crystallinity increase. Based on the results, it can be concluded that magnetic characterization of CoFe2O4 was influenced by grain size and crystallinity.
Crystal Structures and Magnetic Properties of Polyethylene Glycol (PEG-4000) Encapsulated Co0.5Ni0.5Fe2O4 Magnetic Nanoparticles Suharyadi, Edi; Griyanika, Lintang; Utomo, Joko; Agustina, Ayu Kurnia; Kato, Takeshi; Iwata, Satoshi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 8, No 2 (2018): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (629.629 KB) | DOI: 10.13057/ijap.v8i2.22108

Abstract

Nanocrystalline mixed spinel ferrite of Co0.5Ni0.5Fe2O4 magnetic nanoparticles (MNPs) has been successfully synthesized by coprecipitation method and encapsulated by PEG-4000 with various concentrations. X-Ray Diffraction (XRD) patterns showed that nanoparticles contained Co0.5Ni0.5Fe2O4 spinel ferrite with crystallite size of 14.9 nm. After PEG-4000 encapsulation particles size decreased became 7.7 nm. Interaction Co0.5Ni0.5Fe2O4 nanoparticles with long chain PEG-4000 caused the crystal growth trap. Lattice parameter and X-Ray density have no significant difference after encapsulated PEG-4000. The coercivity (??) of Co0.5Ni0.5Fe2O4 was 214 Oe. The ?? decreased after PEG-4000 encapsulation became 127 Oe, which is due to the decrease of crystallite size. The maximum magnetization (Mmax) of Co0.5Ni0.5Fe2O4 was 12.0 emu/g, and decreased after PEG-4000 encapsulation to 11.7 emu/g, because PEG-4000 is paramagnetic. After the concentration of PEG-4000 increased, then the amount of paramagnetic material increase which lead maximum magnetization decrease.
Co-Authors Agustina, Ayu Kurnia Budi Utami, Hesti Retno Edi Suharyadi Eko Arief Setiadi, Eko Arief Fahmi, Nur Fadhilah Heri Kiswanto Joko Utomo Lintang Griyanika Shabrina, Nanda Takeshi Kato