Synthesis of magnetite nanoparticles by high energy ball milling

Abstract

We report on the preparation of magnetite nanoparticles, with size ranging from 12 nm to 20 nm, by high energy ball milling. The synthesis is made using stoichiometric amounts of distilled water and metallic iron powder. The milled powder samples were analyzed by Mossbauer spectroscopy (MS), Xray diffraction (XRD) and vibrating sample magnetometry (VSM). Our results indicate that the milling time is a key parameter of the synthesis. By increasing the milling time one achieves high purity magnetite samples. Also, the particle size decreases with the milling time. The sample milled during 10 h contained a fraction of 56 nm metallic Fe particles and 20 nm magnetite particles. By increasing the milling time to 96 h we have obtained a sample that is mainly composed of 12 nm magnetite particles. MS performed at room temperature showed a spectrum consisting of two sextets with hyperfine parameters related to iron ions occupying octahedral (A) and tetrahedral (B) sites. We have used a self-consistent method to investigate the impact of the dipolar interaction to drive the system to a magnetically blocked regime.

Mechano-synthesis, structural and magnetic characterization, and heat release of α-Fe nanoparticles embedded in a wüstite matrix

“…In the case of the FeM40h sample, the MS reveals a spectrum that can be modeled with five subspectra: a sextet related to the Fe, three doublets and a singlet related to the wüstite. The sextet has similar hyperfine parameters as the precursor material Fe powder sample, a result in agreement with the one verified for magnetically blocked α-Fe particles [9]. On the other hand, the wüstite is paramagnetic at room temperature and antiferromagnetically ordered at temperatures below 195 K [8].…”

Preparation and Performances of Hierarchical Structured HZSM‐5 Washcoating on Stainless‐Steel Substrates

“…Slurry composition applied for analysis is shown in the Table . For all samples, the PSD shifted to smaller districts as milling time prolonged due to the continuous mechanical strength . Hierarchical zeolites had the smaller and more concentrated PSD than parent zeolite [Fig.…”

Preparation and characterization of poly(ethylene glycol) stabilized nano silver particles by a mechanochemical assisted ball mill process

“…5,22,23 procedure. 20,[24][25][26] However, according to literature, there has been limited reports for the synthesis of nano sized silver particles by this process. 27 Poly(ethylene glycol) (PEG) is a synthetic polyether polymer frequently used medical applications, owing to its wide range of molecular weight, excellent solubility in aqueous medium, low toxicity, chain flexibility and its biocompatibility properties and in addition, it is biodegradable via its excretion from the body to form non-toxic metabolites.…”