Abstract
A series of Zn ferrite nanoparticles was prepared by varying the concentration of precipitating agent (NaOH) in the range of 1 � 5 M. Carboxymethylcellulose (CMC) was used as capping agent for stabilizing the particles and to prevent agglomeration. The synthesis done at low temperature was followed by a thermal treatment at 500ºC for 6 h in air. The crystallite size determined using Scherer formula ranged between 8 - 10 nm while the nanoparticles average size observed by Transmission Electron Microscopy varied in between 7-10 nm showing that the increase of coprecipitation agent concentration influences the particles growth. Vibrating sample magnetometry confirmed the strong influence that nanoparticles morphology and size play on superparamagnetic properties of Zn ferrite.
Highlights
A series of Zn ferrite nanoparticles was prepared by varying the concentration of precipitating agent (NaOH) in the range of 1 – 5 MS at kOe (Ms)
All annealed samples exhibit Bragg reflections peaks perfectly indexed to the cubic spinel structure (Fd-3m) indicating the formation of the single-phase ZnFe2O4 spinel ferrites [35, 49], but a slight contribution appears at the lowest NaOH concentration corresponding to an impurity phase such as Fe2O3, which dominates over (400) plane once the concentration is increased
In conclusion, nanocrystalline zinc ferrite was successfully synthesized by coprecipitation method changing the condition reactions by varying the concentration of precipitation agent
Summary
A series of Zn ferrite nanoparticles was prepared by varying the concentration of precipitating agent (NaOH) in the range of 1 – 5 M. In the last years Zn ferrite nanoparticles were reconsidered for different application such as hyperthermia [1], contrast agents [2 - 5], drug delivery [6], theranostic [7] due to their biocompatibility This material is being used for industrial application as waste water treatment [8], environmental protection [9] as well as gas sensing [10] and the list of possible application can continue. Magnetic properties of spinel ferrite nanoparticles are different from those of bulk materials and substantially depend on the particle size [12], [13]. Depending on the synthesis media, aqueous or not, on the coprecipitation agent concentration or the pH of the solution or of the subsequent thermal treatment different grade of inversion is realized. The main goal of our study was to prepare ZnFe2O4 capped nanoparticles by simple aqueous coprecipitation of zinc (II) chloride and ferric (III) chloride solutions using NaOH as alkali and carboxymethylcellulose (CMC) as surfactant [34, 37]. The variations in particle size and shape induced predominant changes in the magnetic behaviour of zinc ferrite powders
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