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- W791366271 abstract "MSU-4 type mesoporous silica has been synthesized with polyoxyethylenesorbitan monolaurate (Tween 20) as structure-directing agent (MTS) as a template and tetraethyl orthosilicate Si(OEt)4 (TEOS) as silica source. The mesoporous structures have a wide application in the luminescence study because of their organization, large surface area, and size of pores. In this work, MSU-4 mesoporous silica was functionalized with 3-amino-propyl-triethoxysilane (APTES) for luminescence applications. Mesoporous silica and amino-functionalized silica was characterized by small-angle X-ray scattering (SAXS), infrared spectroscopy (FT-IR) and nitrogen adsorption/desorption isotherms at 77 K (BET). A luminescent material was prepared by formation of the complex Eu(tta)3 in methanolic medium within the channels of MSU-4 type ordered mesoporous silica. Using simple wet impregnation methods, the europium ion was first encapsulated followed by ligand 2-thenoyltrifluoracetonate (tta) addition. This process it was done for washed, calcined and functionalized mesoporous silica. Analogous one sample of functionalized silica was impregnated with the complex already ready. All samples were characterized by photoluminescence spectroscopy. The spectroscopy studies in room temperature showed the energy absorption of the ligand range ultraviolet in excitation spectra. The emission spectra this materials displayed the typical Eu intra-4f6 lines ascribed to transitions between the D0,1 excited states and the ground multiplet (F0-4). Negligible emission from the organic part of the encapsulated species was observed, indicating that energy transfer from the ligands to the Eu ion was quite efficient. The hypersensitive D0 F2 line showed the mesoporous silica effect in luminescence europium chelate." @default.
- W791366271 created "2016-06-24" @default.
- W791366271 creator A5088849916 @default.
- W791366271 date "2009-03-06" @default.
- W791366271 modified "2023-09-24" @default.
- W791366271 title "Interação do complexo luminescente [Eu(tta)3] com sílica mesoporosa" @default.
- W791366271 hasPublicationYear "2009" @default.
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