Core@shell magnetic nanoparticles: multifunctional materials with tunable properties for technological applications

• Grant number: 10/20546-0
• Support Opportunities: Regular Research Grants
• Start date: January 01, 2012
• End date: December 31, 2013
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Miguel Jafelicci Junior
• Grantee: Miguel Jafelicci Junior
• Host Institution: Instituto de Química (IQ). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil
• Associated researchers: Marian Rosaly Davolos

Abstract

The research proposal aims to investigate materials preparation method from colloidal systems mainly to have metals, alloys, single and mixed valence oxides, as well as nanostructured systems. Synthesis of Fe, Co, Ni, FeCo magnetic nanoparticles (NPs) throught modified poliol method is proposed emphasizing the reactional medium, solvent and precursors influences by changing and protecting magnetic nanoparticles with noble metals (Au, Ag, Pt e Pd), giving core@shell type nanostructures. Core@shell NPs surface functionalization is carried out by reacting interfacial chemical groups and then changing the surface for instance by thermosensitive polymers or molecules with specific activities, such as luminescent complexes. Colloidal stability of functionalized NPs in aqueous médium strongly depends on the surface features and changes with parameters such as, pH, ionic strength, particles concentration, and medium composition. Stability ratio (w) of colloidal dispersions of metallic NPs is carried out by absorbance measurement of colloids as a function of electrolyte solutions addition to calculate the stability ratio. Expected results on metallic NPs knowledgement shall be published in scientific periodics, in dissertations and doctoral thesis. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

NUNES, ELOIZA DA SILVA; VIALI, WESLEY RENATO; DA SILVA, SEBASTIAO WILLIAM; HUAMANI COAQUIRA, JOSE ANTONIO; GARG, VIJAYENDRA KUMAR; DE OLIVEIRA, ADERBAL CARLOS; MORAIS, PAULO CESAR; JAFELICCI JUNIOR, MIGUEL. Characterization of tetraethylene glycol passivated iron nanoparticles. Applied Surface Science, v. 315, p. 337-345, OCT 1 2014. (10/20546-0)

BARUD, H. S.; TERCJAK, A.; GUTIERREZ, J.; VIALI, W. R.; NUNES, E. S.; RIBEIRO, S. J. L.; JAFELLICI, M.; NALIN, M.; MARQUES, R. F. C.. Biocellulose-based flexible magnetic paper. Journal of Applied Physics, v. 117, n. 17, MAY 7 2015. (10/20546-0, 13/07793-6)

VIALI, WESLEY RENATO; NUNES, ELOIZA DA SILVA; DOS SANTOS, CAIO CARVALHO; DA SILVA, SEBASTIAO WILLIAM; ARAGON, FERMIN HERRERA; HUAMANI COAQUIRA, JOSE ANTONIO; MORAIS, PAULO CESAR; JAFELICCI, JR., MIGUEL. PEGylation of SPIONs by polycondensation reactions: a new strategy to improve colloidal stability in biological media. JOURNAL OF NANOPARTICLE RESEARCH, v. 15, n. 8, AUG 2013. (10/20546-0)