The Effect of Temperature on Synthesis and Stability of Superparamagnetic Maghemite Nanoparticles Suspension

Irwan Nurdin,&Nbsp Satriananda,&Nbsp Ridwan

doi:10.4236/msce.2016.43005

Irwan Nurdin, &Nbsp Satriananda + Show 1 more

Open Access

https://doi.org/10.4236/msce.2016.43005

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Abstract

Maghemite (γ-Fe2O3) nanoparticles have been synthesized using chemical co-precipitation at a different temperature. Characterizations of the sample were performed by X-ray diffraction (XRD), transmission electron microscopy (TEM), alternating gradient magnetometry (AGM) and thermogravimetryanalysis (TGA). The stability of the maghemite nanoparticles suspension was studied at different pH and time of storage by dynamic light scattering (DLS) and zeta potential measurements. The XRD patterns confirmed that the particles were maghemite. TEM observation showed that the particles have spherical morphology with narrow particle size distribution. The particles showed superparamagnetic behavior with good thermal stability. The increasing of temperature in the synthesis of maghemite nanoparticles produced smaller size particles, lower magnetization, better thermal stability and more stable maghemite nanoparticle suspension.

Highlights

Due to their unique behaviors, many researchers have been interested in magnetic nanoparticles in recent years
It is shown that the crystallite sizes of nanoparticles are gradually reduced if the temperature is rises
Stable maghemite nanoparticles have been successfully synthesized by co-precipitation method at various temperatures

Summary

Introduction

Due to their unique behaviors, many researchers have been interested in magnetic nanoparticles in recent years They are using in a broad range of applications including electronic, mechanical engineering, aerospace, environmental and bioengineering [1]-[3]. Some of the particular applications of these magnetic nanoparticles are in fields of micro-electronics as the audio speaker, energy supply, HVAC, magnetic seal in motors, magnetic ink for banking cheques. Mainly magnetite (Fe3O4) and maghemite (γ-Fe2O3), are favorable magnetic materials that are intensively explored due to their specific magnetic properties [9]. The suspensions of these magnetic nanoparticles in a liquid medium generate a new class of liquid called “magnetic fluids.”

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