ARAUJO, P. M. A. G.; http://lattes.cnpq.br/0844236806064113; ARAÚJO, Pascally Maria Aparecida Guerra de.
Resumo:
Given the current global need to develop materials that present new clinical
applications in medicine, especially in imaging, have given prominence by the
scientific community, the development of hybrid materials formed by combining
optimized properties between inorganic nanoparticles and a polymer matrix. Thus,
the surface of the inorganic nanoparticles of ZnAI204 and ZnAI19Euo,o504 were
modified with 3-aminopropyltrimethoxysilane silane agent to improve the interaction
among the inorganic/organic compound. Subsequently, the nanoparticles were used
as filler for the development of hybrid films of chitosan/ZnAI204 and chitosan/
ZnAh 9Eu0,05O4 obtained by the solvent evaporation method at concentrations of 1:1,
1:3 and 1:5, respectively. Both inorganic nanoparticles of ZnAI204 and
ZnAI1]9Eu0,05O4 as the hybrid films were characterized by XRD, SEM, FTIR;
TGA/DTA and excitation and emission Spectroscopy. By XRD diffractograms it was
observed that both nanoparticles (NPs) of ZnAI204 as luminescent nanoparticles
(NPLs) of ZnAI19Euo,o504 howed the phase of ZnAI204 . The hybrid films of
chitosan/ZnAI204 and chitosan/ZnAli,9Eu0,05O4 showed peaks associated with
ZnAI204 and bands relating to chitosan. The FTIR spectra of NPs of ZnAI204 and
NPLs of ZnAI19Eu0,05O4 revealed the presence of bands ZnAI204 . For the hybrid films
of chitosan/ZnAI204 and chitosan/ZnAh 9Eu0.05O4 it was observed the tendency for
the band that confirms the formation of ZnAI204 and bands of chitosan overlapping
bands of silane agent groups. By TGA/DTA curves it was seen that the addition of
nanoparticles of ZnAI204 and ZnAh 9Eu0,05O4 caused an increase in thermal stability
of the hybrid films of chitosan/ZnAI204 and chitosan/ZnAI19Eu0,05O4 as compared to
chitosan films. ZnAI204 and ZnAh 9Eu0,05O4. By SEM it was observed that
agglomerates and nanoparticles of ZnAI204 and s ZnAh,9Eu0,05O4 howed appearance
irregular shape and variable and the presence of a few pores. The hybrid films of
chitosan/ZnAI204 and chitosan/ZnAh 9Eu0,05O4 showed a protruding structure, with
clusters on the surface and encapsulated in chitosan. By means of the emission and
excitation Spectra was observed that the hybrid films of chitosan/ZnAI204 and
chitosan/ ZnAI1i9Eu0,05O4 presented promising luminescent properties for application
in the field. The optimized luminescence properties occurred due to the greater
intensity of transition of 5D0—>7F2 of the Europium with emission in the red region,
presenting thus promising properties for application as biological sensors in
biomedicine.