Ni0.5Zn0.5Fe2O4 nanoparticles and their magnetic properties and adsorption of bovine serum albumin

✍ Scribed by Chengtao Jiang; Ruijiang Liu; Xiangqian Shen; Lin Zhu; Fuzhan Song

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 650 KB
• Volume: 211
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2011.03.039

✦ Synopsis

Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles were synthesized by the facile citrate-gel process and the preliminary measurement for adsorption of bovine serum albumin (BSA) protein on these nanoparticles was carried out. The gel precursor and resultant nanoparticles were characterized by TG-DSC, FTIR, XRD, TEM and VSM techniques and the BSA adsorption on the nanoparticles was analyzed by UV spectrophotometer at room temperature. The results show that the single phase of spinel Ni 0.5 Zn 0.5 Fe 2 O 4 is formed at 400 °C. With increasing calcination temperature from 400 to 700 °C, the average grain size increases from about 14 to 45 nm and consequently, the specific saturation magnetization of Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles increases from about 46 to 68 Am 2 /kg. The coercivity initially increases and then decreases with increasing calcination temperature, with a maximum value 9.2 kA/m at 500 °C. The as-prepared Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles exhibit a good adsorbing ability for BSA and the optimized adsorption is achieved for the Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles calcined at 500 °C with grain size about 24 nm.