Magnetic Properties and AC Losses in AFe2O4(A = Mn, Co, Ni, Zn) Nanoparticles Synthesized from Nonaqueous Solution

Oleksandr Yelenich,Alexandr Tovstolytkin,Taras Kolodiazhnyi,Anatolii Belous,Sergii Solopan,Yuliya Tykhonenko

doi:10.1155/2015/532198

Oleksandr Yelenich, Alexandr Tovstolytkin + Show 4 more

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https://doi.org/10.1155/2015/532198

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Abstract

Nanosized particles of AFe2O4(A = Mn, Co, Ni, or Zn) spinel ferrites were synthesized by coprecipitation from nonaqueous solutions using nitrate salts as starting reagents. The particles were characterized by X-ray diffraction, transmission electron microscopy, and magnetic measurements. Quasistatic magnetic measurements show superparamagnetic behavior with blocking temperature below room temperature for cobalt, nickel, and zinc spinel ferrite nanoparticles. Characteristic magnetic parameters of the particles including average magnetic moment of an individual nanoparticle and blocking temperature have been determined. The specific loss power which is released on the exposure of an ensemble of synthesized particles to a magnetic field is calculated and measured experimentally. It is shown that among all nanoferrites under study, the ZnFe2O4nanoparticles demonstrate the highest heating efficiency in AC magnetic fields. The key parameters responsible for the heating efficiency in AC magnetic field have been determined. The directions to enhance the SLP value have been outlined.

Highlights

Nanosized particles of AFe2O4 (A = Mn, Co, Ni, Zn) spinel ferrites are the subject of considerable scientific and practical interest
The directions related to the use of the NPs for drug delivery [5], as well as hyperthermia in the treatment of cancer [6, 7], have not been completely investigated and such works become more and more topical
For the calorimetric determination of specific loss power (SLP), the ferrofluids based on synthesized NPs were prepared using 0.1% aqueous agarose solutions [14] and placed into a coil (5 turns, 30 mm diameter) that provided the AC magnetic field with frequency 300 kHz and amplitudes up to 7.7 kA/m

Summary

Introduction

The directions related to the use of the NPs for drug delivery [5], as well as hyperthermia in the treatment of cancer [6, 7], have not been completely investigated and such works become more and more topical. For the use as hyperthermia agents, the NPs have to satisfy additional requirements: the ensemble of particles has to demonstrate high values of specific loss power (SLP) released upon exposure to AC magnetic field. Of AC losses in the ensemble of such NPs, and identify the ways to increase their heating efficiency

Experimental Section

Results and Discussion

Conclusions