Synthesis, non-isothermal crystallization and magnetic properties of Co0.75Zn0.25Fe2O4/poly(ethylene-co-vinyl alcohol) nanocomposite

Bulletin of materials science

Nasrallah M Deraz¹  Taieb Aouak¹  Abdullah S Alarifi¹ 

[1] Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia$$Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaChemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia$$

关键词: Co0.75Zn0.25Fe2O4;    poly(vinyl alcohol-co-ethylene);    nanocomposite;    non-isothermal crystallization;    magnetization.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The synthesis of Co_0.75Zn_0.25Fe₂O₄/poly(vinyl alcohol-co-ethylene) (ferrite/PEVA) nanocomposite was carried out through two steps: impregnation of the ferrite particules by PEVA and then mixing the ferrite/PEVA impregnated with PEVA solution. A non-isothermal study of the crystallization kinetic of ferrite/PEVA nanocomposite was carried out by differential scanning calorimetry (DSC), scanning electron microscope (SEM) and X-ray diffraction (XRD) techniques. It was observed that the Ozawa equation describes perfectly the primary process of non-isothermal crystallization of ferrite/PEVA system. There is a strong dependence of the ferrite/PEVA composition on the crystallization parameters. The crystallization activation energy (𝐸_a) calculated from the Xu and Uhlmann model increased by increasing the ferrite content in ferrite/PEVA nanocomposites between 3 and 7wt% and decreased dramatically beyond these values. The results revealed that the ferrite nanoparticles were uniformly distributed throughout the PEVA matrix. The percentage of magnetization of the composite decreases as the concentration of the ferrite increases.

【 授权许可】

Unknown