Effect of nitric acid concentrations on synthesis and stability of maghemite nanoparticles suspension

Nurdin, Irwan and Johan, Mohd Rafie and Yaacob, Iskandar Idris and Ang, Beechin (2014) Effect of nitric acid concentrations on synthesis and stability of maghemite nanoparticles suspension. The Scientific World Journal, 2014. pp. 1-7. ISSN 2356-6140 E-ISSN 1537-744X

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Abstract

Maghemite (γ-Fe2O3) nanoparticles have been synthesized using a chemical coprecipitation method at different nitric acid concentrations as an oxidizing agent. Characterization of all samples performed by several techniques including X-ray diffraction (XRD), transmission electron microscopy (TEM), alternating gradient magnetometry (AGM), thermogravimetric analysis (TGA), dynamic light scattering (DLS), and zeta potential. The XRD patterns confirmed that the particles were maghemite. The crystallite size of all samples decreases with the increasing concentration of nitric acid. TEM observation showed that the particles have spherical morphology with narrow particle size distribution. The particles showed superparamagnetic behavior with decreased magnetization values at the increasing concentration of nitric acid. TGA measurement showed that the stability temperature decreases with the increasing concentration of nitric acid. DLS measurement showed that the hydrodynamic particle sizes decrease with the increasing concentration of nitric acid. Zeta potential values show a decrease with the increasing concentration of nitric acid. The increasing concentration of nitric acid in synthesis of maghemite nanoparticles produced smaller size particles, lower magnetization, better thermal stability, and more stable maghemite nanoparticles suspension.

Item Type:	Article (Journal)
Additional Information:	6524/58399
Uncontrolled Keywords:	maghemite nanoparticle; magnetic nanoparticle; nitric acid; unclassified drug; ferric ion; ferric oxide;nanoparticle;nitric acid
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TD Environmental technology. Sanitary engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof. Dr. Iskandar Idris Yaacob
Date Deposited:	19 Sep 2017 11:00
Last Modified:	23 Feb 2018 08:37
URI:	http://irep.iium.edu.my/id/eprint/58399

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