Facile Method to Tune the Particle Size and Thermal Stability of Magnetite Nanoparticles

Journal of the Brazilian Chemical Society

Loushambam H. Singh¹  Sudhanshu S. Pati¹  Maria J. A. Sales¹  Edi M. Guimarães¹  Aderbal C. Oliveira¹  Vijayendra K. Garg¹ 

关键词: magnetite;    zeolite;    confined growth;    thermal stability;   

DOI  :  10.5935/0103-5053.20150207

来源: SciELO

【 摘 要 】

Nucleation and growth mechanism of iron oxide nanoparticles on zeolite template and their stability dependence are reported. Hyperfine field resulting from the variation of particle size indicates the effect of zeolite on particles growth; particle size decreases at lower concentration of zeolite. At higher concentration, a fraction of nano Fe3O4 experiences hyperfine field (45 and 49 T) similar to bulk particles. Effect of incubation and digestion time on the particles growth and the binding effect with zeolite are discussed. Annealing treatments show that the binding of nanoparticles with zeolite stabilizes the nanoparticles with regard to agglomeration and structural transformation. Thermogravimetry-differential thermal analysis (TG-DTA) shows that increase in dehydration temperature from 335.1 to 351.7 K results in zeolite content increasing from 0 to 1000 mg. Weight loss of the particles prepared in incubation time of 0.5 min is 9.46% and reaches 13.9% in 240 min. The weight loss remains practically constant at ca. 9% irrespective of the digestion method.

【 授权许可】

CC BY   
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