Synthesis of a Fe3O4/PAA-based magnetic fluid for faraday-rotation measurements
Sinteza magnetne tekočine na osnovi Fe3O4/PAA za meritve Faradayeve rotacije

english

2013

volume 47, issue 1

Inštitut za kovinske materiale in tehnologije
(Obvezni izvod spletne publikacije)

Highly water-soluble Fesub{3}Osub4/PAA (polyacrylic acid) nanoparticles (NPs) were synthesized with the high-temperature hydrolysis method. We report the first demonstration of Faraday rotation (FR) for a magnetic fluid (MF) synthesized with this novel method. The experiments were performed in the DC regime (0-6 . 10sup{-2} T) at room temperature for 14 concentrations from 1.8 mg/ml to 5 mg/ml. The maximum rotation was recorded as 0.96° cmsup-1 for 3.33 mg/ml and this is called the critical concentration (Csub{CRITICAL}). It was found that the rotation tends to decrease when the concentration is higher than Csub{CRITICAL}. The MF behavior for FR is discussed with respect to substructure interactions (particle-particle, chain-chain). This work provides a new insight for the FR investigations of MFs including highly water-soluble magnetic NPs.

09.05.2014