Structural and optical features of ureasiloxane-polyethylene oxide hybrids containing CeO2 nanoparticles

Autor(es)

Truffault, L. ^[1] ; Magnani, M. ^[1] ; Hammer, P. ^[1] ; Santilli, C. V. ^[1] ; Pulcinelli, S. H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo State, Dept Phys Chem, Inst Chem, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS; v. 471, p. 73-80, APR 20 2015.
• Citações Web of Science: 2

Resumo

Ureasiloxane-polyethylene oxide 1900 hybrids loaded with CeO2 nanoparticles were prepared by the sol-gel method, and the effects of CeO2 incorporation on the structural and optical features of the hybrids were studied. The formation of a colloidal suspension of CeO2 nanoparticles, prepared by the sol-gel process, was monitored in situ by UV-vis spectroscopy. After separation from the colloidal suspension, the ceria powders were analyzed by transmission electron microscopy and X-ray diffraction, confirming the presence of nanoparticles about 3 nm in size, containing the fluorite phase. Three different ceria concentrations were then incorporated into the ureasiloxane-polyethylene oxide hybrid. The nanostructural properties of the loaded hybrids, studied by small angle X-ray scattering, showed that the mean distance between two siloxane nodes was slightly increased by the incorporation of Ce. X-ray photoelectron spectroscopy analysis revealed the presence of both Ce(IV) and Ce(III) in the loaded hybrids. The presence of Ce significantly increased the UVA/B absorption capacity of the ureasiloxane-polyethylene oxide 1900 matrix, while maintaining its transparency in the visible region. The production of transparent UVA/B absorbing matrices loaded with CeO2-based nanoparticles extends the potential applications of U-PEO hybrids in the biomedical and optical devices fields. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/12087-8 - Monitoring of UV filters uptake/release from polyether-ureasil hybrid materials
• Beneficiário: Laurianne Truffault
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado