Título:	Facile method to tune the particle size and thermal stability of magnetite nanoparticles
Autor(es):	Singh, Loushambam H. Pati, Sudhanshu Shekhar Sales, Maria José Araújo Guimarães, Edi Mendes Oliveira, Aderbal Carlos de Garg, Vijayendra Kumar
Assunto:	Magnetita Crescimento Estabilidade
Data de publicação:	Nov-2015
Editora:	Sociedade Brasileira de Química
Referência:	SINGH, Loushambam H. et al. Facile method to tune the particle size and thermal stability of magnetite nanoparticles. Journal of the Brazilian Chemical Society, São Paulo, v. 26, n. 11, p. 2214-2223, nov. 2015. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015001102214&lng=en&nrm=iso>. Acesso em: 16 abr. 2018. doi: http://dx.doi.org/10.5935/0103-5053.20150207.
Abstract:	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.
Unidade Acadêmica:	Instituto de Física (IF) Instituto de Química (IQ) Instituto de Geociências (IG)
Licença:	Journal of the Brazilian Chemical Society - This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0). Fonte: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015001102214&lng=en&nrm=iso. Acesso em: 16 abr. 2018.
DOI:	http://dx.doi.org/10.5935/0103-5053.20150207
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