CLAUDIA AKEMI KODAIRA GOES
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Artigo IPEN-doc 12562 Síntese e caracterização de trocadores iônicos inorgânicos a base de óxidos mistos estanho-titânio2006 - PAGANINI, P.P.; GOES, C.A.K.; FELINTO, M.C.F.C.; BRITO, H.F.; TEOTONIO, E.E.S.Este trabalho apresenta a síntese de dois trocadores iônicos inorgânicos visando sua utilização na recuperação de metais em efluentes aquosos. Os trocadores são à base de óxidos mistos de estanho-titânio sendo um dos trocadores dopado com európio. Foram caracterizados através das técnicas de espectroscopia de infravermelho, difração de raios-X, espectroscopia de luminescência, análise térmica e microscopia eletrônica de varredura. Os trocadores apresentaram-se na forma de aglomerados de superfície homogênea, com uma distribuição granulométrica heterogênea e em sua maioria com diâmetros menores que 20 µm. As análises de difratogramas de raios-X mostram picos largos o que indicam que os trocadores apresentam tamanhos de cristalitos nanométricos (~5nm).Artigo IPEN-doc 15132 Using lanthanide chelates and uranyl compounds for diagnostic by fluoroimmunoassays2009 - SANTOS, ELEN G.; TOMIYAMA, CLAUDIA S.; KODAIRA, CLAUDIA A.; LOURENCO, ANA V.S.; FELINTO, MARIA C.F.C.; BRITO, HERMI F.; BRITO, MARIA E.F.The importance of the luminescence of lanthanide ions and UO2 2+ is related to its peculiar characteristics, e.g. long lifetime and line-like emission bands in the visible, which make these ions unique among the species that are known to luminescence. Recent developments in the field of supramolecular chemistry have allowed the design of ligands capable of encapsulating lanthanide ions, thus forming kinetically inert complexes. By introduction of chromophoric groups in these ligands, an intense luminescence of the ion can be obtained via the "antenna effect", defined as a light conversion process involving distinct absorbing (ligand) and emitting (metal ion) components. In such a process, the quantities that contribute to the luminescence intensity are (i) the efficiency of the absorption, (ii) the efficiency of the ligand-metal energy transfer, and (iii) the efficiency of the metal luminescence. Encapsulation of lanthanide ions with suitable ligands may therefore give rise to "molecular devices" capable to emit strong, long-lived luminescence. Besides the intrinsic interest in their excited state properties, compounds of lanthanide ions, in particular of the Eu3+ and Tb3+ ions, and now UO2 2+ are important for their potential use as luminescent labels for biological species in fluoroimmunoassays (FIAs). This is most interesting because fluorimetric labeling represents an alternative method to the use of radioactive labels, which has long been the most common way of quantifying immunoreactions. In this article we report information about luminescent materials, which gave a good signal to quantify biological molecules by TR-FIA, DELFIA , DSLFIA, RIA and FRET.Artigo IPEN-doc 09522 Luminescence investigation of Eusup(3+) ion in the REsub(2)(WOsub(4))sub(3) matrix (RE=La and Gd) produced using the Pechini method2002 - KODAIRA, C.A.; BRITO, H.F.; FELINTO, M.C.F.C.Artigo IPEN-doc 15069 Inorganic ion exchanger based on tin/titanium mixed oxide doped with europium to be used in radioactive waste2009 - PAGANINI, PAULA P.; FELINTO, MARIA C.F.C.; KODAIRA, CLAUDIA A.; BRITO, HERMI F.Artigo IPEN-doc 15201 Study of quantum dota based on tin/yttrium mixed oxide doped with terbium to be used as biomarker2009 - PAGANINI, PAULA P.; FELINTO, MARIA C.F.C.; KODAIRA, CLAUDIA A.; BRITO, HERMI F.; NUNES, LUIZ A.O.