| Full text | |
| Author(s): |
Daniel B. Fumis
[1]
;
Maria L.D.C Silveira
[2]
;
Caroline Gaglieri
[3]
;
Laura T. Ferreira
[4]
;
Rodrigo F.C. Marques
[5]
;
Aroldo G. Magdalena
[6]
Total Authors: 6
|
| Affiliation: | [1] Universidade Estadual Paulista. Faculdade de Ciência, Departamento de Química - Brasil
[2] Universidade Estadual Paulista. Faculdade de Ciência, Departamento de Química - Brasil
[3] Universidade Estadual Paulista. Faculdade de Ciência, Departamento de Química - Brasil
[4] Universidade Estadual Paulista. Departamento de Química Analítica. Físico-Química e Inorgânica do Instituto de Química - Brasil
[5] Universidade Estadual Paulista. Departamento de Química Analítica. Físico-Química e Inorgânica do Instituto de Química - Brasil
[6] Universidade Estadual Paulista. Faculdade de Ciência, Departamento de Química - Brasil
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 25, 2022-10-28. |
| Abstract | |
Abstract The surface of Fe3O4 nanoparticles is very reactive and can oxidize to γ-Fe2O3 (maghemite) and α-Fe2O3 (hematite) structures. Based on this, the oxidation process of Fe3O4 nanoparticles must be prevented, and one of the strategies is surface functionalization with organic or inorganic molecules. Thus, this study analyzed the thermal behavior of Fe3O4 and Fe3O4-EDTA nanoparticles using X-ray diffraction (XRD), simultaneous thermogravimetry-differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC). Results showed that γ- Fe2O3 was obtained as an intermediate in Fe3O4 and Fe3O4-EDTA decomposition, as confirmed by TG-DTA and DSC curves. Moreover, Fe3O4-EDTA exhibited a temperature peak (Tp = 573.5°C) of phase transformation (γ-Fe2O3 → α-Fe2O3) higher than that of Fe3O4 (Tp = 533.0°C), confirming that EDTA molecules stabilized the nanoparticles efficiently. The kinetic behavior of samples changed, and the activation energy for functionalized samples decreased. (AU) | |
| FAPESP's process: | 16/01599-1 - Studies about the use of NbCl5 in multicomponent reactions for the synthesis of organic dyes |
| Grantee: | Luiz Carlos da Silva Filho |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 15/00615-0 - Studies on the synthesis and photochemical and photophysical characterization of quinoline derivatives with donor-p-acceptor structure for use as sensitizing dyes in organic electronic devices |
| Grantee: | Giovanny Carvalho dos Santos |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 13/09022-7 - Thermoanalytical studies, synthesis and characterization of the solid co-crystals of antibiotics (fluoroquinolones) with some co-formers |
| Grantee: | Massao Ionashiro |
| Support Opportunities: | Regular Research Grants |