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Sains Malaysiana
37(4): 389-394(2008) Size-controlled Synthesis and Characterization
of Fe3O4 Nanoparticles by Chemical Coprecipitation
Method (Sintesis Saiz Terkawal dan Pencirian Nanozarah Fe3O4
Melalui Kaedah Kepemendakan Kimia) Chia Chin Hua, Sarani Zakaria, R. Farahiyan, Liew Tze
Khong, Kien L. Nguyen,
Mustaffa Abdullah & Sahrim Ahmad School of Applied Physics, Faculty of Science
and Technology Universiti Kebangsaan Malaysia, 43600 Bangi,
Selangor, Malaysia Kien L. Nguyen Australian Pulp
and Paper Institute Department of
Chemical Engineering Monash University,
Clayton VIC 3800, Australia Received: 19 February 2008 / Accepted: 6 March 2008 ABSTRACT Magnetite (Fe3O4) nanoparticles
have been synthesized using the chemical coprecipitation method.
The Fe3O4 nanoparticles were likely formed
via dissolution-recrystallization process. During the precipitation
process, ferrihydrite and Fe(OH)2 particles formed
aggregates and followed by the formation of spherical Fe3O4
particles. The synthesized Fe3O4 nanoparticles exhibited
superparamagnetic behavior and in single crystal form. The synthesis
temperature and the degree of agitation during the precipitation
were found to be decisive in controlling the crystallite and
particle size of the produced Fe3O4 nanoparticles.
Lower temperature and higher degree of agitation were the favorable
conditions for producing smaller particle. The magnetic properties
(saturation magnetization and coercivity) of the Fe3O4
nanoparticles increased with the particle size. Keywords: Chemical coprecipitation; ferrite; magnetite;
nanoparticles ABSTRAK Nanozarah magnetit (Fe3O4)
telah disintesis dengan menggunakan kaedah pemendakan kimia.
Nanozarah Fe3O4 terbentuk melalui proses
pelarutan-penghabluran. Semasa proses pemendakan, zarah-zarah
ferihidrit dan Fe(OH)2 membentuk agregat and diikuti
dengan pembentukan zarah-zarah magnetit yang berbentuk sfera.
Nanozarah-nanozarah magnetit yang terbentuk menunjukkan sifat
superparamagnet dan berhablur tunggal. Suhu sintesis dan darjah
pengacauan semasa proses pemendakan memainkan peranan penting
dalam pengawalan saiz hablur dan saiz zarah nanozarah Fe3O4. Suhu rendah dan darjah pengacauan yang tinggi merupakan keadaan
yang sesuai untuk menghasilkan zarah dengan saiz yang kecil.
Sifat kemagnetan
tepu dan koersiviti bagi nanozarah Fe3O4
didapati meningkat dengan peningkatan saiz zarah. Kata kunci: Ferit; magnetit; nanozarah; kepemendakan kimia REFERENCES/RUJUKAN
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