چكيده به لاتين
Due to the superiority of the nanocrystalline materials properties of coarse material, in recent years much attention has been paid to produce this class of materials. The magnetic ferrite nanoparticles, due to their wide applications including data storage systems, medicine and magnetic fluids are highly regarded. Magnetic ferrite nanoparticles including medical applications, their use in cancer treatment and is destroy cancerous tumors using hyperthermia. If the particles are stable in a fluid and placed in an alternating magnetic field, causing overheating the environment. Many studies on a types of magnetic nanoparticles and methods of their synthesis with different coating and different ways to stabilize the fluid is executed.
In the present study calcium ferrite for the synthesis and coating by solvothermal method was selected because of low toxicity compared to the other ferrites. From a variety of analysis techniques such as XRD, SEM, VSM, EDX, FTIR was used to study the morphology and identification of nanoparticles. In this study, two types of water and ethylene glycol as solvent and with sodium hydroxide precipitating was used. Synthesized nanoparticles by water solvent had a very weak magnetization but synthesized nanoparticles by water solvent had emu/g 83 magnetization this led in the following study ethylene glycol solvent is applied. Then, the effects of reaction temperature and reaction time on the particle size was investigated and the results showed minimal changes in particle size. Particle size was reduced to 365 nm by changing the precipitating from Sodium hydroxide to the sodium acetate. The continued study, polyethylene glycol as a capping agent was used which resulted in particle size to 220 nm decline. Another part of the study, effect of zinc on calcium powder ferrite were investigated, the results showed an increase in magnetization by increasing the amount of zinc showed. At the end of the study the influence of magnetic field on nanofluids produced was investigated. The aim of this study is to provide the best conditions for the formation of calcium ferrite nanoparticles and coating them with polyethylene-glycol to achieve a magnetic and biocompatible combination.
Keywords: Calcium ferrite, Solvothermal, Nanofluid, Hyperthermia, polyethylene glycol, Calcium-zinc ferrite
