Surface Modified Ni Nanoparticles Produced by the Electrical Explosion of Wire

A.P Safronov,I Orue,A Larrañaga,S.M Bhagat,I.V Beketov,A.M Murzakaev,Galina V Kurlyandskaya

doi:10.4028/www.scientific.net/ssp.233-234.513

Abstract

Spherical nickel nanoparticles were prepared by the electrical explosion of wire. The as-prepared nanoparticles were modified immediately after fabrication at room temperature in order to provide tunable surface properties with focus on the development of composites filled with nanoparticles. Following liquid modificators were used: hexane, toluene and the solution of polystyrene in toluene. In one case the surface modification by carbon was made in gas phase as a result of hydrocarbon injection. The average size of the nanoparticles was about 50 nm and unit cell parameters were close to 0.351 nm. Detailed characterization was done by X-ray diffraction, transmission electron microscopy, and magnetization measurements. Sphericity was also checked using microwave resonant absorption.

Highlights

Separated magnetic nanoparticles (MNPs) are being intensely studied with focus on technological applications [1,2,3]
At room temperature the magnetization curves are close to saturation at reasonably low magnetic fields: for all MNPs the magnetization in the field of 18 kOe insured the 0.98 value of the saturation magnetization
Using the saturation magnetization approach for Ni-II MNPs we obtained Ms ≈ 49 emu/g for T = 300 K, which is very close to the one obtained directly from the experimental M(H) dependence and only about 5% lower than the expected for bulk fcc Ni value Ms ≈ 55 emu/g [4]

Summary

Introduction

Separated magnetic nanoparticles (MNPs) are being intensely studied with focus on technological applications [1,2,3]. Chemical surface properties of MNP strongly depend on the fabrication technology. In this work we have prepared nickel MNPs by the EEW technique. The as-prepared MNPs were surface modified in order to provide tunable surface properties.

Results

Conclusion