Enhancement of Neel Relaxation at Magnetic Heating Performance of Iron Oxide Nanoparticles 

The study is based on understand the titanium (Ti) doping effect to enhance the Neel relaxation at magnetic heating performance of magnetite (Fe 3 O 4 ). Ti doped magnetite ((Fe 1-x ,Ti x ) 3 O 4 ; x= 0.02, 0.03 and 0.05) superparamagnetic nanoparticles were synthesized via sol-gel technique. The analyses were performed for (Fe 1-x ,Ti x ) 3 O 4 and core-shell (SiO 2 coated (Fe 1-x ,Ti x ) 3 O 4 ) nanoparticles in order to understand the influence of silica coating on the magnetic properties of nanoparticles. The target of study to enhance the Neel relaxation mechanism on magnetic heating. The interparticle spacing and Ti amount were two parameters that we focused on the study. The results provided that coating with SiO 2 has no specific effect on heating performance of (Fe 1-x ,Ti x ) 3 O 4 nanoparticles. While the increase in temperature (ΔT) under 150 kHz RF signal reached up to 22 o C in 10 minutes for SiO 2 coated (Fe 0.97 ,Ti 0.03 ) 3 O 4 nanoparticles, which was very close value of uncoated Fe 3 O 4 nanoparticles.