Abstract: In this work we report the preparation, characterization, thermal and luminescence properties of highly luminescent polycarbonate (PC) polymer films. The diaquatris(thenoyltrifluoroacetonate)europium(III) complex [Eu(tta)3(H2O)2] in doping concentration at 1, 2, 5, 7 weight % was incorporated in the PC polymer for PC-Eu TTA material. Thermogravimetry analysis (TGA) showed no weight loss in the range of 333–473 K for the polymeric systems confirming the interaction between the polymer matrix and the Eu3+-complex via replacing of the water molecules in the complex precursor by the carbonyl groups along the polymer backbone. Evaluation of the photophysics stability showed the influence of the UV wavelength exposition on doped polymer. Differential scanning calorimetry (DSC) showed no significant changes in Tm for the exposed film samples, however crystallinity is affected by non combined complex in the polymer chains. In the infrared spectra the peaks related to the H2O vibrational modes in the europium β-diketonate are not found in the PC systems, suggesting interaction between the carbonyl groups in PC and the Eu3+ ion by replacing of H2O molecules. The changes in the areas of fitted FTIR spectral curve for each component peak are gradually changed with the increase of doping concentration. The observation of characteristic emission bands arising from the 5D→7FJ transitions (J=0–4) dominated by the hypersensitive 5D→7F2 transition at around 614 nm of Eu3+ ion indicate the incorporation of the Eu3+ ions in the system. With the film of 5% doping concentration of the Eu3+ complexes showing the highest luminescence intensity among all samples.Luminescence quenching is observed in PC Eu TTA7%. During uv exposition the quantum efficiency increased up to 6h of exposition, while evidences in the FTIR spectra showed degradation of the polymer backbone.This suggests that chain scission of PC can recombine in new oxidativegroups and react with theEu3+-complex.

PARRA, DUCLERC F.; LIMA, VINICIUS da S.; FELINTO, MARIA C.F. da C.; FORSTER, PEDRO L. Highly luminescent polycarbonate films doped with diaquatris(thenoyltrifluoroacetonate)europate(III) complex - UV exposition effect. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... 2016. p. 766-766. Disponível em: http://repositorio.ipen.br/handle/123456789/27549. Acesso em: $DATA.

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Abstract: All polymers when exposed to the environment suffer diverses alterations due to the action of diverse factors such UV light, poluition, acid rain and others. In this study, the modified polypropylene by gamma irradiation (HMSPP – high melt strength polypropylene) was blended with Cloisite 20A to obtain HMSPP nanocomposite. The PP-g-MA, polypropylene graft maleic anhydride, was utilized as compatibilizant agent [1]. The samples were processed in twin-screw extruder and the dumbbell samples were obtained by thermopressing. The samples was exposed in environment by 6 months [1,2]. The chemical analysis was evaluate by Carbonyl Index (CI) and Melt Flow Index (MFI). With increase of time, the CI also increased, indicating the chain scission process, principally in the chain backbone, as observed in MFI, which value has increased very fast with increasing of time.

KOMATSU, LUIZ G.H.; OLIANI, WASHINGTON L.; LUGAO, ADEMAR B.; PARRA, DUCLERC F. Photo-oxidation of modified Polypropylene nanocomposite. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... 2016. p. 708-708. Disponível em: http://repositorio.ipen.br/handle/123456789/27547. Acesso em: $DATA.

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Abstract: The characterization of near-field couplings becomes an extremely important activity to optimize the best nominal performance of any electronic device in the presence of others. In order to handle the electromagnetic compatibility (EMC) problems at the initial design phase, a predictive method based on multipolar expansion in spherical harmonics has been developed. A new automatic measurement system has also been designed which allows the measurements of the magnetic field all around the device. In this paper, the impacts of the measurement uncertainties and the disturbances caused by the power wires are studied.

LI, Z.; TAVERNIER, F.; KRAHENBUHL, L.; VOYER, D.; SARTORI, C.; BREARD, A. Error analysis for near-field EMC problems based on multipolar expansion approach. In: BIENNIAL CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION, 17th, November 13-16, 2016, Miami, Florida, USA. Abstract... 2016. p. 1-1. Disponível em: http://repositorio.ipen.br/handle/123456789/27539. Acesso em: $DATA.

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Abstract: The number of motor vehicles has increased by 118% over the past decade in Brazil, which is transforming urban space regarding mobility, parking and disposal capacity of these vehicles. Impounded vehicle scrapyard overcrowding has become a challenge in many Brazilian regions. This now is considered a potential risk to soil quality, since vehicles are usually parked directly on the topsoil. The aim of this study was to evaluate topsoil samples from a scrapyard of impounded vehicles for Potentially Toxic Elements (PTEs), like As, Co, Cr, Cu, Mo, Ni, Pb, and Zn, and rare-earths. The area of study is in Ribeirão Pires, São Paulo, Brazil. For this purpose, forty samples were analysed by Instrumental Neutron Activation Analysis (INAA) and X-Ray Fluorescence Spectrometry (XRF). The obtained values were compared with literature data from Brazil and other regions around the world, as so with recommended values from environmental regulatory agencies. Some soil-geochemical variables [including pH, organic matter (OM), cation exchange capacity (CEC)], and texture (e.g. clay, silt and sand content) were used to interpret the behaviour of the studied elements in the soil. The PTEs contents ranged as follows: As (<3–15 mg kg–1), Co (2–30 mg kg–1), Cr (7–183 mg kg–1), Cu (3–73 mg kg–1), Mo (<1–6 mg kg–1), Ni (<3–38 mg kg–1), Pb (23–211 mg kg–1) and Zn (18–352 mg kg–1). In some hotspots, PTEs content exceeded continental crust and also international recommended values. The normalization of the rare-earth data by the Post-Archean Average Australian Shale (PAAS) indicated high anomalous values of Ce in some points that may suggest an anthropogenic source, such as vehicle exhaust catalysts (VEC). Total contents of PTEs rank in the following order: Cr>Zn>Pb>Cu>Ni>As>Co>Mo. This is the first study in scrapyards of impounded vehicles in Brazil. The results may be used to monitor soil contamination in these sites and for more effective environmental management.

LANGE, CAMILA N.; FIGUEIREDO, ANA M.G.; ENZWEILER, JACINTA. Soil trace element status in an impouded vehicle scrapyard. In: INTERNATIONAL CONFERENCE ON RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 1st, April 10-16, 2016, Budapest, Hungary. Abstract... 2016. p. 155-156. Disponível em: http://repositorio.ipen.br/handle/123456789/27536. Acesso em: $DATA.

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Abstract: O processo de conformação por prensagem é um dos mais utilizados na indústria cerâmica devido ao seu baixo custo e alta produtividade. O entendimento e controle dos diversos fatores que interferem neste processo são de fundamental importância, pois grande parte dos defeitos encontrados na peça final são originados nesta etapa. Partindo-se de pós processados em spray-dryer, de diferentes composições a base de alumina e contendo diferentes aditivos orgânicos, variaram-se parâmetros como distribuição de tamanho, umidade e temperatura de grânulos, e velocidade de compactação, avaliando-se as características dos corpos obtidos, por meio de curvas de compactação e microestrutura e propriedades mecânicas. As curvas de compactação foram interpretadas considerando-se diferentes modelos e equações empíricas disponíveis na literatura podendo-se determinar qual a equação que melhor descreve os dados experimentais. Constatou-se que os parâmetros variados interferem fortemente na densificação e microestrutura dos compactados, definindo em grande parte as características mecânicas do produto final.

SANTOS, A.A.; CHRISTIE, C.M.; MARUYAMA, N.H.; GENOVA, L.A. Variáveis de processo e curvas de compactação de cerâmicas a base de alumina secas em spray-dryer. In: CONGRESSO BRASILEIRO DE CERAMICA, 55., 29 de maio - 01 de junho, 2011, Porto de Galinhas, PE. Resumo... 2011. Disponível em: http://repositorio.ipen.br/handle/123456789/27485. Acesso em: $DATA.

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Abstract: A anemia falciforme (HbS) é uma das doenças genéticas mais comuns em todo o mundo, com incidências de predominância em descendentes africanos, mas já diagnosticada numa parcela expressiva da população branca. Atualmente é considerada uma doença de saúde pública no Brasil (ANVISA). O método desenvolvido neste projeto é o fluoroimunoensaio, baseado no uso de complexos de terras raras. O desenvolvimento destes nanomateriais luminescentes abre novas possibilidades para diversos experimentos para medicina diagnóstica. Devido ao potencial de aplicação no mercado o presente projeto está elaborando uma metodologia padronizada e acessível para detecção de HbS em amostras sanguíneas. Com o desenvolvimento desses nanomateriais, estão sendo avaliadas, suas propriedades luminescentes, sua capacidade de atuação como marcador de aminoácidos e a resposta do sistema estudado quando comparado com metodologias existentes. O projeto contribuirá originalmente para o desenvolvimento econômico, cultural e social, cujos resultados terão impacto no Estado de São Paulo e conseqüentemente no Brasil.

FELINTO, M.C.F.C.; SANTOS, E.G.; BRITO, M.E.F.; BRITO, H.F.; KODAIRA, C.A. Desenvolvimento de uma metodologia para determinação de Hemoglobina S (Anemia Falciforme) utilizando nanomarcadores. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 18., 24-28 de novembro, 2008, Porto de Galinhas, PE. Resumo... 2008. p. 4394-4394. Disponível em: http://repositorio.ipen.br/handle/123456789/27483. Acesso em: $DATA.

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Abstract: Nos últimos anos, o titânio e suas ligas vêm se mostrando como o principal material na confecção das partes endósseas de implantes cirúrgicos, por apresentarem excelente biocompatibilidade, elevada relação resistência mecânica/massa específica e boa resistência à corrosão. A liga Ti-13Nb-13Zr, obtida por fusão no início da década de 90, tem se destacado por possuir alta resistência mecânica, elevada biocompatibilidade e módulo de elasticidade mais próximo ao apresentado pelas estruturas ósseas. A busca por materiais que apresentem uma integração biológica estável ao longo dos anos tem sido foco de inúmeras pesquisas onde diversos tratamentos superficiais têm sido testados com o intuito de avaliar o contato osso-implante. Neste sentido, uma alternativa recentemente adotada tem sido o processamento desses materiais por metalurgia do pó (M/P), já que a introdução de poros na estrutura do material poderá proporcionar o crescimento de tecido ósseo no seu interior garantido sua manutenção e nutrição. Assim, o objetivo deste estudo foi avaliar “in vitro” a toxicidade de amostras da liga Ti-13Nb-13Zr, produzidas com diferentes níveis de porosidade. Para tanto, utilizando-se da mistura dos pós metálicos de Ti, Nb e Zr, produzidos por hidrogenação, foram preparadas amostras cilíndricas com diferentes níveis de porosidade a partir de prensagens uniaxial e isostática a frio com posterior sinterização em condições variáveis de temperatura e patamar. Para a aplicação segura da liga Ti-13Nb-13Zr produzida por M/P “in vivo” faz-se necessário a confirmação da sua biocompatibilidade. Após a obtenção das amostras estas foram esterilizadas e submetidas ao ensaio de citotoxicidade de acordo com as normas da ISO 10993-5, utilizando-se a linhagem de células de ovário de hamster chinês (CHO-K1). Diluições seriadas dos extratos das amostras foram expostas à cultura celular e o ensaio foi avaliado pela incorporação do corante vital MTS, que é diretamente proporcional ao número de células viáveis na cultura. O parâmetro de toxicidade é tomado como aquela concentração do extrato que produz uma redução de 50% na absorção do corante. Os resultados obtidos mostraram que as diferentes amostras testadas não são consideradas citotóxicas, nas condições analisadas, tornando-se possível o delineamento de experimentos “in vivo” para avaliação da integração óssea desse material.

BOTTINO, M.C.; HENRIQUES, V.A.R.; LORENZETTI, S.G.; HIGA, O.Z.; BRESSIANI, A.H.A.; BRESSIANI, J.C. Avaliação da citotoxicidade da liga Ti-13Nb-13Zr obtida por metalurgia do pó com diferentes níveis de porosidade. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 16., 28 de novembro - 02 de dezembro, 2004, Porto Alegre, RS. Resumo... 2004. Disponível em: http://repositorio.ipen.br/handle/123456789/27481. Acesso em: $DATA.

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Abstract: This article provides an in vitro biological approach of the so called radiation synthesized protein-based nanoparticles as the use of nanoparticles for biomedical purposes requires precise understanding of their properties and effects on the body before clinical may take place. This technique allows proper control of papain nanoparticles with preserved biological activity for drug delivery. Biocompatibility results revealed that papain nanoparticles, of approximately 8-9 nm, were found to be biosafe in PBMC cells at concentrations up to 0.4 mg.ml-1 for up to 72 hours period. The nanoparticles were able to specifically bind to anti-Carica papaya polyclonal antibody with higher intensity than native papain. The stimuli of mouse splenocytes by papain nanoparticles led to the production of high levels of IL2. No significant levels of IL6, IL10 and IFNγ were produced by the stimuli. At nanoparticle concentrations above the cytotoxic limit, the concentration of IL2 was totally suppressed indicating no pro- nor anti-inflammatory response by means of cytokine mediated pathways. These in vitro results suggest that papain nanoparticles crosslinked by gamma irradiation may be safely administered with low nor negligible toxicity, holding strong applications for drug loading.

VARCA, GUSTAVO; LIMA, MAYARA I.S.; ALVES, PATRICIA T.; MOHAMED, LINA B.; GRASSELLI, MARIANO; GOULART, LUIZ R.; LUGAO, ADEMAR B. Engineered papain nanoparticles by gamma irradiation: towards safe therapeutic applications. In: INTERNATIONAL MEETING ON RADIATION PROCESSING, 18th, November 07-11, 2016, Vancouver, BC, Canada. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27479. Acesso em: $DATA.

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Abstract: Over the last few years, there was a growth on the import level of fruits in Brazil. Lycium barbarum, also known as goji-berry, is a red berry fruit with oval shape found mainly in Tibet with high importing demands. This berry has a high antioxidant potential and it is sold in Brazil on the dried form to guarantee shelf-life extension and to avoid microbiological contamination. The aims of this study was to evaluate the goji-berry’s biocompounds by 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity and oxygen radical absorbance capacity ORAC assays analyzing the hydroalcoholic and the aqueous extracts processed by radiation. Total phenolics were also determined by the Folin-Ciocalteu assay. In addition, the samples were bought at the retail market in the city of São Paulo (Brazil) and irradiated by electron beam accelerator in the doses of 0, 2.5, 5.0, 7.5 e 10.0 kGy. Thus, an increase significantly in the doses of ionizing radiation in this case did not result in the goji-berry’s antioxidant activity.

SILVA, PAMELA G. da; KOIKE, AMANDA C.R.; ALENCAR, SEVERINO M. de; MANCINI FILHO, JORGE; RODRIGUES, FLAVIO T.; VILLAVICENCIO, ANNA L.C.H. Radiation influence on biocompounds in lycium barbarum. In: INTERNATIONAL MEETING ON RADIATION PROCESSING, 18th, November 07-11, 2016, Vancouver, BC, Canada. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27477. Acesso em: $DATA.

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Abstract: Salad dressings are oil-in-water emulsions and they have been investigated by several authors due to its importance in the choice of an adequate formulation, process conditions and quality control. Their composition may vary and imply in viscosity changes. As an alternative treatment to minimize the effects of heat processing, and increase the shelf life of products the irradiation can be a potential solution allied to the fact that can be applied in the final product package. Food irradiation can be employed to reduce microbial load and to enhance product quality. In this way, it has been applied in different types of food. The aim of this study was to verify the sensory evaluation and viscosity of salad dressings submitted to irradiation treatment at 3kGy and 5kGy. Sensory evaluation were performed with untrained panelist (n = 52) and color, flavor, odor and an overall appearance parameters were assessed. The measurements were made using a nine-point hedonic scale. The rheological behavior of each sample was carried out after temperature equilibrium (25ºC) was reached; using a Brookfield rheometer model LV-DVIII. Viscosity and rheological behavior were measured in triplicates. Rheological studies covered the rheograms for each salad dressing in function of irradiation doses. The studied salad dressings presented shearthinning behavior better explained by power law model. The irradiation treatment did not modify this behavior as well as their viscosities. Sensory evaluation showed no significant differences between irradiated and control samples (p<0.05).

SAGRETTI, JULIANA; SABATO, SUZY; FABBRI, ADRIANA D.T. Influence of gamma radiation on sensory and rheological properties of two comercial salad dressings. In: INTERNATIONAL MEETING ON RADIATION PROCESSING, 18th, November 07-11, 2016, Vancouver, BC, Canada. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27475. Acesso em: $DATA.

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Abstract: Atherosclerosis specific nanocarriers for molecular imaging and therapy depend on their capacity to interact with receptors expressed by target cells. We are interested in the design of nanocarriers composed of nanoparticles conjugated with peptides capable of selectively targeting atheroma. The main purpose of our work was to select phages displaying peptides able to bind to vascular markers present in human atheroma and validate their capacity to target the vascular markers in vitro and in low-density lipoprotein receptor knockout (LDLr-/-) mouse model of atherosclerosis. By performing peptide fingerprinting on human atherosclerotic tissues using in vitro biopanning, we selected and isolated peptides that bind to atherosclerotic lesions, which share significant similarity to known human proteins with prominent roles in the development of atherosclerosis. Among the collection of bound peptides in human atheroma, phages displaying four different peptide sequences were selected for further studies. The CTHRSSVVC-phage peptide displayed the strongest reactivity with human carotid atherosclerotic lesions, (P < 0.05), when compared to tissues from normal carotid arteries. In addition, this peptide sequence shares similarity to a sequence present in the cysteine-rich fifth domain of the scavenger receptor (SRCR), CD163, which appeared to bind to CD163. Moreover, the CTHRSSVVC-phage targets atherosclerotic lesions of a lowdensity lipoprotein receptor knockout (LDLr-/-) mice, in vivo, to high fat-diet group was reported as means ± SEM 45.50, ± S.D 13.97 versus control group. Our data shows that phage displaying the cyclic peptide sequence CTHRSSVVC binds to human atheroma and atherosclerotic lesions in LDLr-/- mice. DOTA-CTHRSSVVC-peptide was synthesized and labeled with 111InCl3 as propose of peptide validation, at radiochemical yield of > 95 % was determined by HPLC. In a pilot study to normal and high fat diet LDLr-/- mice to 1 year diet, preliminary pre-clinical images by SPECT with CTHRSSVVC peptide and 111InCl3 showed different patterns of uptake between arteries to each group. Thus considering the important role of CD163 in macrophages and its high expression levels in inflammation, CTHRSSVVC peptide may provide a remarkable sequence to the development of theranostics approaches and nanodevices composed of a nanoparticle conjugated with peptides capable of targeting selectively, which reinforce this potential offering stabi lity, sensitivity and signal amplification.

SILVA, R.A.; GIORDANO, R.J.; GUTIERREZ, P.S.; ABDALLA, D.S.; MENEGHETTI, J.C.; MARQUES, F.L.; KHOOBCHANDANI, M.; KATTI, K.V.; LUGAO, A.B.; KALIL, J. New peptide as targeting agent for molecular imaging of atherosclerosis by spect. In: CONGRESSO LATINO-AMERICANO DE ORGAOS ARTIFICIAIS E BIOMATERIAIS, 9; CONGRESSO DA SOCIEDADE LATINO AMERICANA DE BIOMATERIAIS, ORGAOS ARTIFICIAIS E ENGENHARIA DE TECIDOS, 13., 24-27 de agosto, 2016, Foz do Iguaçu, PR. Abstract... 2016. p. 39-39. Disponível em: http://repositorio.ipen.br/handle/123456789/27473. Acesso em: $DATA.

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Abstract: O nitreto de silício (Si3N4) é um material cerâmico que se mostra promissor para utilização em próteses ortopédicas e dentais, por apresentar elevadas propriedades mecânicas, capacidade de promover osteointegração, capacidade bactericida e características radiolucentes. Com o intuito de ampliar e otimizar a utilização desses materiais na área médica, novos biocompósitos densos de nitreto de silício, contendo uma fase bioativa livre de fósforo, foram obtidos por sinterização normal. No desenvolvimento de novos materiais, testes de biocompatibilidade necessitam ser realizados. Estes testes variam de análises físico-químicas a análises biológicas. Neste trabalho, o teste de citotoxicidade, considerado o teste padrão inicial para avaliação da biocompatibilidade por análise biológica, foi realizado em diferentes amostras densas de nitreto de silício com quantidades variadas de sílica e cálcia. O teste de citotoxicidade utilizado foi a análise indireta. Neste teste foi preparada a eluição do material em meio de cultura para cultivo de células, assim é possível avaliar a presença de componentes tóxicos que podem ser lixiviados do material e que apresentam potencial tóxico. Os eluentes são colocados em contato com uma camada confluente de células cultivadas aderidas e a viabilidade celular foi medida após 24 horas utilizando-se um corante vital, o MTS (que só reage com células vivas). Para todas as amostras analisadas, nenhuma delas apresentou citotoxicidade, variando a viabilidade celular dos eluídos de 94,7 a 104%.

RODAS, A.C.; GUEDES-SILVA, C.C.; FERREIRA, T.S.; HIGA, O.Z. Testes de citotoxicidade para avaliação in-vitro de biocompósitos de nitreto de sílicio. In: CONGRESSO LATINO-AMERICANO DE ORGAOS ARTIFICIAIS E BIOMATERIAIS, 9; CONGRESSO DA SOCIEDADE LATINO AMERICANA DE BIOMATERIAIS, ORGAOS ARTIFICIAIS E ENGENHARIA DE TECIDOS, 13., 24-27 de agosto, 2016, Foz do Iguaçu, PR. Resumo... 2016. p. 50-50. Disponível em: http://repositorio.ipen.br/handle/123456789/27471. Acesso em: $DATA.

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Abstract: Albumin is a natural drug nanocarrier as it has equivalent diameter of about 5 nm and has natural affinity for hydrophobic and hydrophilic drugs. They can be bound in a reversible way and the delivery controlled by endogenous mechanism. Albumin can be crosslinked by radiation alternatively to conventional systems, in such way that dialdehydes or toxic chemicals are avoided. On the theranostic side, radioactive ions are commonly employed for diagnostic and therapeutic applications. As an example, radioactive gold nanoparticles are currently employed in radiotherapy whether to increase local dose deposition in tissue during radiotherapy or as a local emitter of gamma and beta rays. The radioactive properties of gold include: 198Au (?max=0.96 MeV; t1/2 = 2.7 days) and 199Au (?max =0.46 MeV; t1/2 = 3.14 days), making it a strong candidate for theranostics . Conjugation of such materials with sugars, peptides, antibodies, proteins among others is routinely used nowadays for targeting. While radioactive nanoparticles can offer a much higher dose payload than ions for therapy and diagnostic, in addition to the the huge surface to bind targeting species presented by the nanoparticles, functionalization with proteins may potentially increases the particle uptake by tumors or tissues. The main purpose of this work was the development of one pot in situ synthesis of radioactive gold 198 nanoparticle encapsulated by albumin for application in cancer Theranostics. While crosslinked albumin may provide a nontoxic coating on AuNPs with a controllable hydrodynamic diameter, conventional AuNP can be activated by nuclear reactor to produce 198AuNP. The gamma or beta radiation originated from the gold nanoparticle was used to crosslink the Albumin layer. The use of a radioactive particle able to emit radiation for crosslinking of the Albumin layer and simultaneous theranostic application was tried for the first time. The elegant procedure and ease of produc¬tion combined with the properties of 198Au and the safety of HSA-198AuNP make this new particle an exciting advancement in cancer therapy and diagnosis. For such purpose, radioactive tetrachloroauric acid H198AuCl4 was produced from gold foils of high purity by neutron irradiation in IPEN research nuclear reactor. 198AuNP/BSA were synthesized by stirring aqueous solutions of BSA and radioactive tetrachloroauric acid H198AuCl4. The reaction mixtures were stirred continuously at 25 °C. The color of the mixture become purple-red from pale yellow within 15 minutes indicating the formation of gold nanoparticles. The reaction mixture was stirred for an additional 20 minutes. The 198AuNP/BSA formed were characterized by UV-Vis spectrophotometry, DLS and TEM analysis. The spectra were recorded at first day of preparation and after 1 month. Radioactive gold nanoparticle encapsulated by crosslinked Albumin was prepared in reproducible way. The gold nanoparticle core size measured by TEM was about 20 nm and about 60 to 70 nm with the albumin layer as measured by DLS. Bityrosine formation was measured by fluorescence and it was an evidence of intramolecular and intermolecular crosslinking. In conclusion the technique was suitable for the in situ production of the crosslinked albumin functionalized radioactive gold nanoparticles. Acknowledgements The authors would like to thank Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq) project number 402887/2013-1 and 401438/2014-7 and International Atomic Energy Agency (IAEA) (CRP code F22064 ) for financial support.

LUGAO, A.B.; GERALDES, A.N.; LEAL, J.; VARCA, G.H.C.; BATISTA, J.G.S.; GRASSELLI, M.; KATTI, K.; BARROS, J. Synthesis of radioactive gold 198 nanoparticle encapsulated by albumin as cancer theranostics agent. In: CONGRESSO LATINO-AMERICANO DE ORGAOS ARTIFICIAIS E BIOMATERIAIS, 9; CONGRESSO DA SOCIEDADE LATINO AMERICANA DE BIOMATERIAIS, ORGAOS ARTIFICIAIS E ENGENHARIA DE TECIDOS, 13., 24-27 de agosto, 2016, Foz do Iguaçu, PR. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27469. Acesso em: $DATA.

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Abstract: Ferritic stainless steels might be used for applications as biomaterials when their magnetic properties are useful for fixing prostheses by means of magnetic attachments. The AISI 444 stainless steel (SS) is a non-cytotoxic ferromagnetic stainless steel but its application as biomaterial has not been extensively investigated. In this study, the corrosion resistance and cytotoxicity of the AISI 444 ferritic stainless steel, with low nickel content, extra-low interstitial levels (C and N) and with the addition of Ti and Nb as stabilizers, were investigated to evaluate its potentiality for biomaterials fabrication.The corrosion resistance was studied by anodic polarization methods and electrochemical impedance spectroscopy (EIS), in a saline phosphate buffered solution (PBS) at 37 °C, naturally aerated. The results were compared to that of the ISO 5832 SS. This last steel is the most used metallic material for orthopedic prostheses fabrication. The electronic properties of the passive film formed on AISI 444 SS were evaluated by the Mott-Schottky approach. All tested materials showed passivity in the PBS medium and the passive oxide film presented a duplex nature. In aerated condition, the resistance to pitting corrosion associated to AISI 444 SS was similar to that of the ISO 5832 SS. The AISI 444 stainless steel showed a high potential for use as a biomaterial, especially for the manufacture of prosthetic components with magnetic attachment.

Palavras-Chave: stainless steels; ferromagnetic materials; corrosion; antimitotic drugs; toxic materials; toxicity; dentistry; prostheses; teeth; magnetic materials

COSTA, I.; ROGERO, S.; TERADA, M.; MARQUES, R.A.; BARBOSA, L.P. Corrosion investigation of a ferritic stainless steel for use as implantable dental devices with magnetic connections. In: CONGRESSO LATINO-AMERICANO DE ORGAOS ARTIFICIAIS E BIOMATERIAIS, 9; CONGRESSO DA SOCIEDADE LATINO AMERICANA DE BIOMATERIAIS, ORGAOS ARTIFICIAIS E ENGENHARIA DE TECIDOS, 13., 24-27 de agosto, 2016, Foz do Iguaçu, PR. Resumo... 2016. p. 1234-1234. Disponível em: http://repositorio.ipen.br/handle/123456789/27467. Acesso em: $DATA.

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Abstract: The active principle of the phytotherapics medicines are derived exclusively from herbal drugs. The use of phytotherapics has increased in the worldwide medicine, rendering important security issues in its development to final product. The pesticide residue is a factor that affects the quality of these medicines, due the absorption of pesticides and its metabolites in plants 1. The ANVISA (Agency of National Health Surveillance) regulates the quality medicine in Brazil. Recently this agency released the resolution - RDC n° 105 due to January 1st, 2018, where the pesticide residue analysis should be monitored in plant species used to phytotherapics 2. The two brands of commercial phytotherapic available in drug stores were evaluated in this project, both have passion flower as the active principle. These medicines are most commonly used as anxiolytic. Therefore, this work aims to perform a multiresidues screening analysis of pesticides (acids, phynylureas, organophophoric, triazines and carbamates) in phytotherapics. Samples will be prepared using QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) technique and analyzed by HPLC - MS/MS and GC/MS 3.

GIMENEZ, MAISE; MARQUES, JOYCE; OTOMO, JULIANA; LEBRE, DANIEL; VEGA, OSCAR; MARTINS, ELAINE. Multiresidue screening analysis of pesticides in phytotherapics by HPLC - MS/MS and GC/MS. In: IBERO AMERICAN CONFERENCE ON MASS SPECTROMETRY, 1st; CONFERENCE OF THE BRAZILIAN MASS SPECTROMETRY SOCIETY, 6th, December 10-14, 2016, Rio de Janeiro, RJ. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27465. Acesso em: $DATA.

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Abstract: The sudden disappearance of bees in colonies of several countries have attracted the attention of scientists, the public and the world press [1]. This phenomenon was called Colony Collapse Disorder (CCD) and is characterized by a rapid loss of adult bee population. In these colonies, the queen is still alive and accompanied by few adult bees although there are still pups and food in the hive [2]. There are several hypotheses about the causes of this phenomenon; one of them relates a bees exposure for a class of pesticides named neonicotinoids. These are a class of insecticides which began to be produced in 1985 and are based on the nicotine molecule [3]. These insecticides are used to control sucking and chewing insects because of its low toxicity to mammals, fishes and birds, and high toxicity to arthropods, especially insects and crustaceans [4]. The neonicotinoids used in this study are Clothianidin, Imidacloprid and Thiamethoxam. There is no legislation in Brazil to determine the residual limit in water to any of these pesticides, however, the EPA (United States Environmental Protection Agency) has a legislation with limits for each compound. The residual limit for chronic exposures in surface water is 2.1 μg L-1 for Clothianidin [5], 15.8 μg L-1 for Imidacloprid [6] and 0.6 μg L-1 for Thiamethoxam [7]. This study intends to develop and validate a methodology for neonicotinoids in surface water by high performance liquid chromatography with tandem mass spectrometry (HPLC-MS / MS). The samples for this study are surface water collected from a lake in the Bauru country in São Paulo state. The choice of this lake is because its proximity to sugar cane, orange, coffee and watermelon crops. These samples were filtered through a vacuum filtration system and passed through a sample preparation process using the solid phase extraction (SPE). Strata X cartridge was conditioned with methanol - dichloromethane (1:1) and ultrapure water. The water sample was eluted from the cartridge with an alkaline pH range between 9.90 to 10.10, and the analytes of interest were eluted with methanol - dichloromethane (1: 1). The analysis of HPLC-MS / MS used a High Performance Liquid Chromatograph 1100 series by Agilent with an API 2000 mass spectrometer from Sciex. The analysis performed on Multiple Reaction Monitoring (MRM) mode selecting a quantization and confirmation ion for each compound. The quantitation limits are between 1 - 2.5 μg L-1, and the linearity are between 0.991 – 0.997 in this method.

AMARAL, PRISCILA O.; GIMENEZ, MAISE P.; LEBRE, DANIEL T.; MARQUES, JOYCE R.; BUSTILLOS, OSCAR V. Quantitative analysis of neonicotinoid insecticide residues in surface water by HPLC-MS / MS. In: IBERO AMERICAN CONFERENCE ON MASS SPECTROMETRY, 1st; CONFERENCE OF THE BRAZILIAN MASS SPECTROMETRY SOCIETY, 6th, December 10-14, 2016, Rio de Janeiro, RJ. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27460. Acesso em: $DATA.

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Abstract: Rare earth (RE) ion doped phosphors have attracted great interest during the past several decades due to their unique physical and chemical properties. RE ions can display many meaningful properties in optics, electronics, and magnetics, originating from f-f electronic transitions within the 4f shell. Among these RE ions, the Nd3+ ion is an important activator that can emit in the near infrared, corresponding to the transition, while located in a noncentrosymmetric site. Molybdates are important inorganic compounds and display some excellent performance in the field of lasers, phosphors and ionic conductors. Thus, many materials doped with Nd3+ can be used as infrared emitting phosphors and have potential application like diagnostic, biomarker, image, therapy, etc. Neodimium compound Nd2(MoO4)3 nanoparticles was prepared by co-precipitation route using a dispersor to control the particle shape and size. X-ray diffraction (XRD),scaning eletronic microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectra (PL were applied to characterize the obtained samples. The XRD patterns reveal that as prepared sample is assigned to the scheelite-type tetragonal structure and this extructure change with the thermal treatment to a monoclinic phase. In addition, the as-synthesized Nd2(MoO4)3 particles are high purity well crystallized and with the crystalite size aproximately 21 nm. The possible formation process of Nd2(MoO4)3 nanoparticles have been discussed as well. Upon excitation by ultraviolet radiation, the as-synthesized Nd2(MoO4)3 nanoparticles exhibit the characteristic emission lines corresponding to Nd3+ ion spectra. It was observed the change in the structure with thermal treatment in the emission spectra. The luminescence spectra show the characteristic narrow bands assigned to 4f–4f transitions from the emitting 4 F3/2 level to the 4 I9/2 and, 4 I11/2 levels, centered around 915 and 1060 respectively.

FELINTO, M.C.F.C.; DIAS, C.L.; NAKAMURA, L.K.O.; BARBOSA, H.P.; RODRIGUES, L.C.; BRITO, H.F.; MALTA, O.M.L.; TEOTONIO, E.E.S. Synthesis, characterization and spectroscopic properties of Nd2(MoO4)3 microflowers. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27436. Acesso em: $DATA.

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Abstract: The luminescence of CaTiO3:Pr has been known since mid-90s [1, 2] and its persistent luminescence has been explained via InterValence Charge Transfer transitions. However, the trivalent dysprosium doped materials besides presenting white luminescence does not present any persistent luminescence. On the other hand, the expected red emission on materials doped with Eu3+ only occur when exciting in the forbidden 4f6-4f6 transitions. The objectives of this work are to show the synthesis and luminescence proprieties of CaTiO3:Dy3+ and CaTiO3:Dy3+,R3+ prepared with the sol-gel method [3, 4]. The excitation spectra of single Eu3+ or Dy3+ doped materials (Fig. left) show for Eu3+, only the 4f6-4f6 transitions while for Dy3+ both the 4f9-4f9 transitions as well as the O2-→TiIV charge transfer and the host absorption. The excitation spectrum for the Dy-Eu co-doped material monitoring the Eu3+ emission at 610 nm exhibit both the Eu3+ intraconfigurational transitions as well as the O2-→TiIV charge transfer and the host absorption. This result indicates that there is no direct energy transfer from Dy3+ to Eu3+, but Dy3+ acts as a sensitizer for Eu3+ to be excited by host transitions. Based on experimental data the energy level diagram was constructed (Fig. right) showing that Eu3+ is deep inside the valence band.

BEZZAN, OTAVIO P.; PEDROSO, CASSIO C.S.; CARVALHO, JOSE M.; FELINTO, MARIA C.F.C.; BRITO, HERMI F.; RODRIGUES, LUCAS C.V. Discovering new colors of luminescence in CaTiO3 with rare-earths doped through co-doping. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27434. Acesso em: $DATA.

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Abstract: Anhydrous solid electrolyte membranes with high proton conductivity at intermediate temperatures (150 – 250 °C T-range) are considered key materials for obtaining high power density output in direct alcohol fuel cells (DAFC) and direct methane fuel cells (DMEFC) [1]. High proton conductivity (~10-2 Scm-1) has been observed in solid acids (CSP) such as CsHSO4 at T > 140 °C. The use of such materials in PEFCs has simplified the water management and provided high current densities at intermediate temperatures. However, CSP thin films are fragile, water soluble, and the fabrication of low thickness films is a hard task [1]. On the other hand, polymer electrolytes such as Nafion are flexible and easily obtained in a broad range of thicknesses. However, in anhydrous conditions these polymeric membranes are electrical insulators. In this context, the fabrication of composite membranes based on the addition of CsHSO4 into Nafion matrix above the percolation threshold can substantially improve the proton conductivity at T > 140 °C. The composite membranes were prepared by the in situ incorporation of CsHSO4 by the evaporation/precipitation method. The prepared membranes were characterized by infrared spectroscopy (FTIR), X-ray diffraction (DRX), small angle X-ray scattering (SAXS) and proton conductivity under N2 flow. Highlystable proton conducting membranes based on Nafion-CSPs were obtained. The addition of CsHSO4 into Nafion at high loadings results in a pronounced increase of the proton conductivity at anhydrous condition. The proton conductivity of such composites is a result of the combination of the transport and physical properties of the host matrix and the inorganic filler.

MATOS, BRUNO R.; MORAES, LETICIA P.R. de; SANTIAGO, ELISABETE I.; FONSECA, FABIO C. Structural features and proton conductivity of Nafion-CsHSO4 composite membranes. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... 2016. p. 256-256. Disponível em: http://repositorio.ipen.br/handle/123456789/27428. Acesso em: $DATA.

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Abstract: Solid Oxide Fuel Cells are the most efficient devices known for the direct conversion of fuels into electric energy. Such devices have advanced steadily and are already available for specific applications such as portable power and residential stationary generation. The main objective of this work is the development of anodes for SOFC operating directly with renewable fuels, without the addition of water and using strategic fuels such as ethanol and natural gas. Specifically, a family of mixed ionic-electronic compounds has been investigated: the double perovskites with compositions Sr2(MgMo)1-xRuxO6 with x = 0; 1; 2; 5; 10 e 20 at.%. This material has been synthesized by polymeric precursor method. The resins were prepared by combining stoichiometric amounts of the starting solutions. The resulting solution was heated treated under magnetic stirring. The thermal decomposition of the polymeric resin was studied by means of simultaneous thermogravimetric and differential scanning calorimetry up to 1500 °C with heating and cooling rates of 10 °/min in Ar. The thermal decomposition result shows mass loss up to, approximately, 900 °C. However X-ray diffraction analyses of the powder heat treated at 900 °C and 1200 °C presents a considerable content of an undesiderate phase (SrMoO4). According to the literature for similar compounds a thermal treatment under reduction conditions could be necessary to obtain the double perovskites single phase. After this treatment the material will be characterized regarding its electrical properties. The expected results will contribute to advance both the understanding of the mixed ionic electronic ceramics and the SOFC technology using renewable fuels.

Palavras-Chave: anodes; calorimetry; ceramics; electrical properties; perovskites; solid oxide fuel cells; strontium; synthesis; thermal gravimetric analysis

BEZERRA, MATHEUS E.O.; FONSECA, FABIO C.; FLORIO, DANIEL Z. de. Preparation of Sr2(MgMo)1-xRuxO6 ceramics for use in a solid oxide fuel cell anode. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... 2016. p. 673-673. Disponível em: http://repositorio.ipen.br/handle/123456789/27426. Acesso em: $DATA.

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Abstract: Scandia-stabilized zirconia exhibits the highest ionic conductivity in zirconiabased solid electrolytes [1] and therefore is a candidate material for application in solid oxide fuel cell operating at intermediate temperatures (600–800 °C). However, the crystal structure of this system is complex [1] and several attempts have been made to stabilize the cubic (c) phase at room temperature. Recently, addition of minor amounts of Al2O3, CeO2, Ga2O3, HfO2 was investigated for that purpose [2,3]. In this work, the effects of 1 mol% additives (Dy2O3 and Nb2O5) on zirconia- 10 mol% scandia (10ScSZ) were investigated aiming to stabilize the cubic structure at room temperature and to suppress the characteristic cubic-torhombohedral β phase transformation. Compositions were prepared by the coprecipitation method. Consolidation of the solid electrolyte was accomplished by spark plasma sintering in the 1000–1400 °C range for 1 and 5 min at 65 MPa. The relative density for sintered samples was higher than 95% for temperatures of 1200 °C and higher. X-ray diffraction results show that full stabilization of the cubic phase was attained after sintering for both prepared compositions. Arrhenius plot of total ionic conductivity shows suppression of the reversible phase transformation. Activation energy for oxide ion conduction is approximately 0.80 eV in the high temperature range (>600 °C).

Palavras-Chave: additives; arrhenius equation; density; ionic conductivity; phase stability; plasma; scandium oxides; sintering; x-ray diffraction; zirconium oxides

GROSSO, ROBSON L.; TERTULIANO, ANA J.; MACHADO, IZABEL F.; MUCCILLO, ELIANA N. dos S. Phase stability and ionic conductivity of spark plasma sintered scandia-zirconia containing additives. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... 2016. p. 74-74. Disponível em: http://repositorio.ipen.br/handle/123456789/27424. Acesso em: $DATA.

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Abstract: O etanol, como combustível de células a combustível de etanol direto (DEFCs), tem sido considerado uma alternativa energética promissora devido à baixa toxicidade, elevada densidade energética teórica e ser renovável e amigável ao meio-ambiente. No entanto, problemas relacionados ao baixo desempenho, decorrente da incompleta oxidação e da contaminação catódica por álcoois, que permeiam o eletrólito polimérico, inviabilizam a comercialização desses dispositivos. O aumento da temperatura de operação é desejado, uma vez que as reações de eletro-oxidação são processos termoativados, contribuindo para o aumento global no desempenho das DEFCs. No entanto, a temperatura de operação imposta pelo Nafion (80 oC) é limitada pelo transporte protônico que, por sua vez, é fortemente dependente da água retida pela membrana polimérica [1]. Uma abordagem interessante para prevenir efeitos de perda de condutividade do Nafion, sobretudo em temperaturas superiores a 100°C, é a inserção de uma fase higroscópica, como SiO2 e TiO2, na matriz perfluorosulfonada ácida –fração condutora do Nafion– formando nanocompósitos híbridos [2]. Nesse contexto, o presente estudo tem como objetivo a combinação de ânodos e eletrólitos otimizados para operação em DEFC’s de temperaturas intermediárias (130 °C). Membranas híbridas baseadas em Nafion-SiO2 foram sintetizadas pela incorporação e produção do óxido de silício por rota sol-gel diretamente nos agregados iônicos de membranas de Nafion de diferentes espessuras (95, 125 e 175 μm) e conformações (casting e extrusão) [3]. Eletrocatalisadores de PtSn/C de diferentes composições foram sintetizados pelo método do poliol modificado a partir de dois redutores [4]. Ânodo e eletrólito otimizados foram avaliados em protótipos de DEFC nas temperaturas de operação de 80 e 130 °C. As células a combustível unitárias usando eletrocatalisadores PtSn/C (75:25) e Nafion 117 não-modificado, ambos comerciais, apresentaram uma densidade de potência máxima de 40 mW.cm-2 a 80 °C. A DEFC composta por ânodo e eletrólito otimizados, ou seja, ânodo de PtSn/C (70:30) produzido pelo método do poliol e eletrólito híbrido Nafion-SiO2 (13% em massa), apresentou uma densidade de potência máxima de 122 mW.cm-2, a 130 °C. O significativo aumento no desempenho das DEFCs é justificado pela aceleração da reação de oxidação do etanol (ROE), sem a diminuição da condutividade iônica do Nafion em temperaturas superiores a 100 °C.

DRESCH, M.A.; GODOI, D.R.M.; VILLULLAS, H.M.; FONSECA, F.C.; SANTIAGO, E.I. Híbridos Nafion-SiO2 combinados com anodos de PtSn/C para DEFC de temperatura intermediária de operação. In: SIMPÓSIO BRASILEIRO DE ELETROQUÍMICA E ELETROANALÍTICA, 20., 17-21 de agosto, 2015, Uberlândia, MG. Resumo... 2015. Disponível em: http://repositorio.ipen.br/handle/123456789/27420. Acesso em: $DATA.

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Abstract: We will present observed OH in the Amazon rain forest using a chemical ionization mass spectrometer (CIMS). The observation was conducted at the T3 site in Manacapuru, Amazonas Brazil. It had been accepted almost as an axiom that very low OH is expected in low NO environments such as a pristine rain forest. However, recent studies in the pristine rain forest environments consistently reported significantly higher than expected OH levels. This sparked extensive and intensive studies to explore any possibility of OH regeneration from isoprene photo-oxidation processes in the low NO condition. Four OH regeneration processes related with isoprene photochemistry have been proposed since 2008. However, the levels of the expected OH enhancement vary greatly among the proposed OH regeneration processes mediated by the isoprene oxidation processes. As all enhanced OH observations from the pristine areas with high isoprene conditions have used the laser induced fluorescence (LIF) technique, the possibilities of potential positive artifacts have also been explored. In this context, the first tropical forest CIMS OH dataset will be discussed in the context of 1) comparisons with previously reported OH using the LIF technique, 2) comparisons with box model calculated OH with different isoprene oxidation scenarios to reconcile measured and calculated OH, and 3) comparisons with regional model calculated OH. The CIMS observational dataset along with a comprehensive trace gas dataset provides a constraint to assess current uncertainty in oxidation capacity of the pristine forested region, which has tremendous implications towards global fates of short lived climate forcers.

KIM, SAEWUNG; SECO, ROGER; PARK, JEONG-HOO; SJOSTEDT, STEVEN J.; GUENTHER, ALEX B.; SMITH, JAMES N.; LIU, YINGJUN; BUSTILLOS, JOSE O.V.; SOUZA, RODRIGO A.F. de; TOTA, JULIO; MARTIN, SCOT T. OH observations in a tropical rain forest environment using a chemical ionization mass spectrometry technique during GOAmazon intensive campaigns. In: AMERICAN GEOPHYSICAL UNION FALL MEETING, December 14-18, 2015, San Francisco. Abstract... 2015. Disponível em: http://repositorio.ipen.br/handle/123456789/27413. Acesso em: $DATA.

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Abstract: Sol gel route was used to synthetize Dy-doped Ytrium disilicate (Dy- Y2Si2O7) powders. The well-defined composition was a concern of the precision of the synthesis process, which stoichiometrically controlled to attain single crystalline phase and obtain fine particles in order to use as raw material for prototyping of bioinspired matrix from Luffa Cylindrica (LCy). The surface of the LCy was carefully prepared by chemical attack and the rheological studies of the aqueous suspensions performed with the synthetized Dy-doped Ytrium disilicate was previously studied. The optimized conditions were used to obtain porous and homogeneous replicas. The pieces biomorphic structure shaped were sintered at 1500 °C / 7h. The prototype was tested as a device for illumination from the burning of biomass in flame and showed good yield. The disilicate emission thermoluminescence doped with dysprosium demonstrated enhance the lumen capacity of this device.

MELLO-CASTANHO, SONIA; SANTOS, SILAS C.; CAMPOS, L.L.; YAMAGATA, C. Synthesis and processing of yttrium dysprosium-doped silicate. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27400. Acesso em: $DATA.

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Abstract: Rare-earth apatite type materials (general formula A10-xM6O26±y; where A=rare earth, M=Si, Al, Ge or P) have been investigated as alternative solid electrolyte materials for SOFC (Solid Oxide Fuel Cells) [1]. This is because of their higher ionic conductivity than conventional zirconia electrolytes, at temperatures between 600ºC and 700ºC. Among apatite rare-earth silicates, the lanthanum silicates, exhibit the highest values of oxide ion conductivity at intermediate temperatures. Lanthanum silicates with general formula La9.33+x (SiO4)6 O2+1.5x (0 ≤ x ≤ 0.67) exhibit high ionic conductivity and low activation energy values at intermediate temperatures (500–700°C). Therefore, they are considered as promising electrolytes for intermediate temperature SOFCs (IT-SOFCs) [2]. Doping into La or Si sites can enhances the ion conductivity of apatite-type lanthanum silicates (ALS). It was observed, for example, to the Mg-doped lanthanum silicate, La9.533(Si 5.7Mg0.3)O26 [3]. The main effort to the actual application of ALS as IT-SOFC electrolyte remains in the difficulty to prepare dense ceramics. High temperatures (1600–1800 °C) and prolonged time are required to obtain a relative density of 90% for ALS prepared by conventional solid-state synthesis route. Secondary phases, such as LaSi2O5 and La2Si2O7 could also remain in the system. Those phases deteriorate the conductivity of the ceramic electrolyte. To synthesize powders with higher sinterability wet-chemical routes, such as, sol–gel, modified sol-gel, molten salts, freeze-drying, co-precipitation and acid citric methods has been practiced. In his work, pure lanthanum silicate La9,56(SiO4)6O2,34 and Mg-doped lanthanum silicate, La9,8Si5,7Mg0,3O26,4 were successfully synthesized by using the sol-gel followed by precipitation method. The crystalline apatite phase of La9,56(SiO4)6O2,34 and La9,8Si5,7Mg0,3O26,4 was obtained by calcination at 900ºC. The density measurements revealed that the samples have a density of higher than 90%.

YAMAGATA, CHIEKO; PAGANELLI, MARJORIE; SILVA, FERNANDO S.; CASTANHO, SONIA R.H. de M. Rare earth silicates powder synthesis for use as SOFC electrolyte. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27398. Acesso em: $DATA.

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Abstract: The bifunctional nanomaterials, co-assembling photonic and magnetic features into single entity nanostructures are remarkable for applications, such as biosensors for medical diagnosis and ionizing radiation scintillation. The preparation of these nanomaterials are accessible through facile methods, using iron oxide as core nanoparticles and RE3+ materials as luminescent center. The magnetic properties are usually due to the core Fe3O4 nanoparticles, however, the magnetic moments of the RE3+ ions are also contributed to the whole magnetization of these nanostructures. In addition, rare earth ions exhibit well-defined narrow emission bands in different spectral ranges from visible to near-infrared due to their 4f intraconfiguration transitions, giving the bifunctional nanomaterials efficient luminescent behavior. In the present work, the preparation strategy and characterizations of the bifunctional Fe3O4@Y2O3:Eu3+ Fe3O4@SiO2@Y2O3:Eu3+, Fe3O4@SiO2@Ag@Y2O3:Eu3+ and -Fe2O3@Y2O3:Eu3+ materials are discussed. The DC magnetic properties (MH and ZFC/FC curves) and photoluminescence behavior of the RE3+ composites based on the emission spectral data and luminescence decay curves are studied. The experimental intensity parameters (λ), lifetimes (), emission quantum efficiencies () as well as radiative (Arad) and non-radiative (Anrad) decay rates are calculated, in addition, based on these parameters iron oxide induced luminescence quenching of Eu3+ ion is studied.

KHAN, LATIF U.; ZAMBON, LUIS F.M.; BRITO, HERMI F.; FELINTO, MARIA C.F.C. Luminescent and magnetic composites: study of iron oxide induced luminescence quenching of Eu3+ ion. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Proceedings... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27396. Acesso em: $DATA.

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Abstract: The design of bifunctional magnetic luminescent nanomaterials containing Fe3O4 functionalized with rare earth ion complexes of calixarene and β-diketonate ligands is reported. Their preparation is accessible through a facile onepot method. These novel Fe3O4@calix-Eu(TTA) (TTA = thenoyltrifluoroacetonate) and Fe3O4@calix-Tb(ACAC) (ACAC = acetylacetonate) magnetic luminescent nanomaterials show interesting superparamagnetic and photonic properties. Besides, the preparation of bifunctional nanocomposites, co-assembling photonic (RE3+) and magnetic (Fe3O4) features into single entity nanostructures is reported through a facile method, using Fe3O4 as core nanoparticles, which were coated with SiO2 shell and further grafted with Eu3+ and Tb3+ complexes. The sophisticated structural features and morphologies of the core-shell Fe3O4@SiO2-(TTA-RE-L) nanomaterials were studied by SAXS analysis. The core mean size , shell thickness , cluster size ξ and fractal dimension DF were determined by fitting the experimental SAXS data, corroborating through Transmission Electron Microscopy images. The DC magnetic properties at temperatures of 2 and 300 K were explored in support to the structural conclusions from SAXS and TEM analyses. The magnetic contributions of the RE3+ ions to the magnetizations of the Eu3+ and Tb3+ nanocomposites were discussed. The photoluminescence properties of the Eu3+ and Tb3+ nanocomposites based on the emission spectral data and luminescence decay curves were studied (Fig.1). The experimental intensity parameters (), lifetimes (), emission quantum efficiencies () as well as radiative (Arad) and non-radiative (Anrad) decay rates were calculated and discussed, in addition, the structural conclusions from the values of the 4f-4f intensity parameters in the case of the Eu3+ ion. These novel Eu3+ and Tb3+ nanocomposites may act as red and green emitting layers for magnetic and light converting molecular devices.

KHAN, L.U.; MURACA, D.; BRITO, H.F.; MOSCOSO-LONDONO, O.; FELINTO, M.C.F.C.; PIROTA, K.R.; TEOTONIO, E.E.S.; MALTA, O.L. Bifunctional optical and magnetic nanocomposites containing Fe3O4 grafted inorganic matrices and functionalize with RE3+ complexes. In: INTERNATIONAL CONFERENCE ON EXCITED STATES OF TRANSITION ELEMENTS, 6th, August 21-26, 2016, Polanica Zdrój, Poland. Abstract... 2016. Disponível em: http://repositorio.ipen.br/handle/123456789/27394. Acesso em: $DATA.

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Abstract: The fabrication of bifunctional nanocomposites, co-assembling photonic (RE3+) and magnetic (Fe3O4) features into single entity nanostructures is reported through a facile method, using Fe3O4 as core nanoparticles, which were coated with SiO2 shell and further grafted with Eu3+ and Tb3+ complexes. The sophisticated structural features and morphologies of the core-shell Fe3O4@SiO2-(TTA-RE-L) nanomaterials were studied by Small-angle X-ray Scattering. The core mean size , shell thickness , cluster size ξ and fractal dimension DF were determined by fitting the experimental SAXS data, corroborating through Transmission Electron Microscopy images. The DC magnetic properties at temperatures of 2 and 300 K were explored in support to the structural conclusions from SAXS and TEM analyses. The magnetic contributions of the RE3+ ions to the magnetizations of the Eu3+ and Tb3+ nanocomposites were discussed. The photoluminescence properties of the Eu3+ and Tb3+ nanocomposites based on the emission spectral data and luminescence decay curves were studied (Fig.1). The experimental intensity parameters (), lifetimes (), emission quantum efficiencies () as well as radiative (Arad) and non-radiative (Anrad) decay rates were calculated and discussed, in addition, the structural conclusions from the values of the 4f-4f intensity parameters in the case of the Eu3+ ion. These novel Eu3+ and Tb3+ nanocomposites may act as red and green emitting layers for magnetic and light converting molecular devices.

KHAN, L.U.; MURACA, D.; BRITO, H.F.; MOSCOSO-LONDONO, O.; FELINTO, M.C.F.C.; PIROTA, K.R.; TEOTONIO, E.E.S.; MALTA, O.L. Optical and magnetic nanocomposites containing Fe3O4@SiO2 grafted with Eu3+ and Tb3+ complexes. In: INTERNATIONAL CONFERENCE ON EXCITED STATES OF TRANSITION ELEMENTS, 6th, August 21-26, 2016, Polanica Zdrój, Poland. Abstract... 2016. p. I-12. Disponível em: http://repositorio.ipen.br/handle/123456789/27392. Acesso em: $DATA.

Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.

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