Navegação Eventos - Resumos por ano de publicação "2016"

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  • IPEN-DOC 22818

    SILVA, FLAVIA R. de O. ; LIMA, NELSON B. ; COURROL, LILIA C.; BRESSIANI, ANA H. de A. . The hydroxyapatite and beta- tricalcium phosphate ratio in europium-doped biphasic calcium phosphate controlled by ph value during the coprecipitation synthesis. In: CONGRESSO BRASILEIRO DE CERAMICA, 60., 15-18 de maio, 2016, Aguas de Lindóia, SP. Resumo... 2016.

    Abstract: Calcium phosphates are chemical compounds of special interest in medicine, since they are the major inorganic component of all mammalian calcified tissues. The most widely used synthetic calcium phosphate-based bioceramics are hydroxyapatite [HA, Ca10(PO4)6(OH)2] and beta-tricalcium phosphate [BTCP, Ca3(PO4)2]. HA is stable in a body fluid, while BTCP is rather soluble. Obtain a fluorescent HA and BTCP nanoparticles offer the attractive possibilities for continuous and nondestructive bioimaging observations, which is helpful for monitoring the implanted subject and the delivering progression of drug carriers. In particular, HA and BTCP can be used as luminescent materials when activated by Eu3+ ions in substitution of Ca2+ ions. Herein, the Eu3+ ions doped HA and BTCP nanoparticles were synthesized by co-precipitation method. The phase composition were analyzed by X-ray diffraction (XRD) using a Multiflex Rigaku diffractometer, transmission electronic microscopy (JEM 2010 –JEOL) and scanning electron microscopy (FEG, JSM 6701F – JEOL). Fluorescence spectroscopy was carried out, at room temperature, in a Fluorolog 3 Fluorimeter from Jobin Yvon in order to investigate the fluorescence emission of the HA-Eu, BTCP-Eu and biphasic compounds. The as-synthesized nanopowders have shown only the hexagonal phase of HA, for all samples. After the thermal treatment at 1000°C, the XRD shows the HA, BTCP and HA/BTCP patterns depending on the pH of the synthesis. Eu-doped HA exhibited a red-orange emission at 575 nm with several minor peaks at 610–640 nm, while Eu-doped BTCP had an unexpected strong red emission at 610-620 nm and a secondary band at 590–600 nm, almost 20-fold higher than HA. This efficient fluorescence of BTCP could be useful for the imaging with biomaterials for therapeutic and diagnostic applications. The biphasic one shows a mixture of the spectra, and the more the BTCP phase, the higher the red emission at 610-620nm.

    Palavras-Chave: apatites; calcium phosphates; europium compounds; ph value; coprecipitation; synthesis; europium ions; nanoparticles; x-ray diffraction; scanning electron microscopy; fluorescence spectroscopy

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  • IPEN-DOC 27064

    SAHYUN, ADELIA ; GHOBRIL, CARLOS N.; PEREZ, CLARICE F.; SORDI, GIAN M. . The evaluation of the real alpha value in Brazil and its projection until the year 2050. In: CLEMENT, CHRISTOPHER (Ed.); VALENTIN, JACK (Ed.); OGINO, HARUYUKI (Ed.); FOOTE, DEVON (Ed.); REYJAL, JULIE (Ed.); OMAR-NAZIR, LAILA (Ed.) INTERNATIONAL CONGRESS OF THE INTERNATIONAL RADIATION PROTECTION ASSOCIATION, 14th, May 9-13, 2016, Cape Town, South Africa. Abstract... The International Radiation Protection Association, 2016. p. 444-444.

    Abstract: The real evolution of the alpha value in Brazil has been performed three times in 1993 and 2000 making use of the procedure advised by ICRP and in 2004 making use of the procedure recommended by the IAEA. In both, the first two papers were made various projections for the coming years until 2025. Because of the great social and economic crisis in which the country (Brazil) is going, we decided to reassess the alpha value of our country and compare it with the projections of the two previous papers. Therefor e, we decided to make a dollar correction from that time to the current dollar, comparing the purchasing power from that time to the current. This procedure has shown us the great gap of value in use and that the actual value should be two to three times h igher. By GDP per capita, we could calculate the alpha value updated to various countries including the European Union and compare them with the official value currently in use. In conclusion, we believe that all countries that adopt an alpha value should upgrade it to the present day.

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  • IPEN-DOC 23394

    RIBEIRO, ALEXANDRE N.; KALLAS, CLAUDETE; SANTOS, GIVANILDO A. dos; NAKAMOTO, FRANCISCO Y.; MORO, JOAO R.; COUTO, ANTONIO A. ; MELO, HERCILIO G. de. The effect of the microstructure upon corrosion resistance of an Al-10wt% Si-2wt%Cu alloy. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 1062-1062.

    Abstract: In general, the corrosion behavior strongly depends on the structural morphology and chemical composition. The literature shows relationships between the corrosion behavior and the structural morphology of the secondary dendrite spacing [1]. The objective of this study is to investigate the influence of the microstructure of an Al-10wt%Si-2wt%Cu alloy in its corrosion resistance. In this work, an Al-10wt%Si-2wt%Cu alloy was solidified under upward unsteady state heat flow conditions. Heat was directionally extracted only through a watercooled bottom made of steel (SAE 1020). The aim of the present work is to investigate the influence of the microstructure of this alloy upon corrosion resistance. Experimental results include primary dendrite arm spacings (l1) and capacitances values (ZC P E ). The corrosion behavior was analysed by electrochemical impedance spectroscopy technique conducted in a 3% NaCl solution at room temperature. Coarser dendritic structures tend to improve the corrosion resistance of an Al-10wt%Si-2wt%Cu alloy.

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  • IPEN-DOC 23757

    CARDOSO, ELIZABETH C.L. ; SCAGLIUSI, SANDRA R. ; LUGAO, ADEMAR B. . The effect of gamma-radiation on biodegradability of synthetic PHB structural foams PP/HMSPP based. In: MEETING OF THE IONIZING RADIATION AND POLYMERS SYMPOSIUM, 12th, September 25-30, 2016, Peninsula of Giens, France. Abstract... 2016. p. 107-107.

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  • IPEN-DOC 23769

    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.

    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%.

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  • IPEN-DOC 27073

    SOUZA, E.R.L.B. de; ALVARENGA, L.H.; LEAL, C.R.L.; LEITE, C.G.; PEREIRA, T.R.; VIEIRA, D.C.; PRETTO, L. de ; FREITAS, A.Z. de ; FERNANDES, A.U.; PRATES, R.A.. Terapia fotodinâmica antimicrobiana combinada ao tratamento periodontal em ratos. In: VIEIRA NETO, HUGO (Ed.); SOARES, ALCIMAR B. (Ed.); FÉLIX, RODRIGO P.B. da C. (Ed.); VIEIRA NETO, HUGO (Org.); MAIA, JOAQUIM M. (Org.); PICHORIM, SÉRGIO F. (Org.); GAMBA, HUMBERTO R. (Org.); COSTA, EDUARDO T. (Org.) CONGRESSO BRASILEIRO DE ENGENHARIA BIOMÉDICA, 25., 17-20 de outubro, 2016, Foz do Iguaçu, PR. Resumo... Rio de Janeiro, RJ: Sociedade Brasileira de Engenharia Biomédica, 2016. p. 2332-2332.

    Abstract: Introdução: A Terapia Fotodinâmica antimicrobiana (aPDT) vem sendo utilizada como adjuvante ao tratamento da periodontite. Ela combina um fotossensibilizador (FS) e fonte de luz para produzir espécies reativas de oxigênio e matar células microbianas [1]. A PpNetNI é um derivado da protoporfirina, e tem um sítio de ligação química no biofilme e grande afinidade às células microbianas. Este estudo tem como objetivo investigar os efeitos da aPDT como adjuvante ao tratamento da periodontite. Materiais e Métodos: Este estudo (aprovado pelo Comitê de Ética da UNINOVE AN0029/2015) incluiu 18 ratos machos Wistar saudáveis (Rattus norvegicus). A periodontite foi induzida pela inserção de uma ligadura de algodão em posição subgengival no primeiro molar inferior. O primeiro molar inferior contralateral não recebeu a ligadura ou nenhum tipo de tratamento, e foi utilizado como controle. Após 7 dias, a ligadura foi removida e todos animais receberam raspagem e alisamento radicular (RAR) [2]. Os grupos (n=3) foram então divididos em: 1) grupo RAR (receberá RAR e irrigação com PpNetNI, 10 μM, sem irradiação) e 2) grupo PDT (irrigado com PpNetNI 10 μM seguido de irradiação com LED durante 90 s). Para irradiação foi utilizado um LED emitindo comprimento de onda de 630 nm com potência radiante de 400 mW (irradiância - 200 mW/cm2; exposição radiante - 18 J/cm2). As avaliações foram realizadas 24 h, 48 h e 7 dias após a intervenção e para isto, 3 animais de cada grupo foram eutanasiados em cada momento experimental. A área de perda óssea na região vestibular do primeiro molar inferior foi avaliada por Tomografia de Coerência Óptica (OCT, THORLABS LTD., Ely, UK). Os dados foram submetidos à análise estatística (teste Mann-Whitney, p˂0.05). Até o momento foram avaliados 6 animais, que foram tratados conforme descrito e eutanasiados 7 dias após o término do tratamento. Resultados: Dentre os animais que foram eutanasiados 7 dias após o término do tratamento, os animais do grupo PDT mostraram um ganho ósseo de aproximadamente 30% quando comparados ao grupo RAR. A OCT foi capaz de detectar a perda óssea nas amostras e foi um método não destrutivo para este modelo experimental. Conclusões: Com os dados obtidos até o momento e com os parâmetros utilizados neste estudo podemos concluir que a aPDT foi uma alternativa eficaz em garantir a saúde periodontal e foi capaz de regenerar os tecidos de suporte periodontal.

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  • IPEN-DOC 23646

    PESQUEIRA, E.I.O. ; ROSSI, J.L. ; POLITANO, R. ; RUIZ, E.E.S.; MACHADO, M.T.. Teoria da difusão aplicada à disseminação de conhecimento. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Resumo... 2016. p. 10163.

    Abstract: O objetivo deste estudo é identificar um modelo de pesquisa capaz de explicar os determinantes da difusão de conhecimento baseada nas mídias sociais, visando o gerenciamento da implementação e a aceleração da difusão na inovação de produtos. A transferência entre agentes realça a importância do conhecimento tácito e o papel fundamental da interação face a face. A maioria das indústrias tem uma rede informal bem estabelecida por meio do qual o conhecimento é negociado. O modelo capta efeitos das inovações incrementais, e sua difusão entre uma rede de agentes heterogêneos. O conhecimento como um vetor de tipos de conhecimento, ao contrário de muitos modelos em que o conhecimento é um escalar simples. O mecanismo e os pontos fortes de ligações entre agentes alteram à medida que ganham experiência com a rede, e a estrutura da rede deve emergir podendo evoluir.

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  • IPEN-DOC 23309

    KRYLOV, V.I. ; BOSCH-SANTOS, B. ; CABRERA-PASCA, G.A. ; CARBONARI, A.W. ; SAXENA, R.N. ; MESTNIK-FILHO, J. . Temperature anomalies of the hyperfine magnetic fields on 111Cd probe nuclei in ferro- and antiferromagnetic phases of the ordered FeRh alloys. In: TEMST, KRISTIAAN (Ed.); VANTOMME, ANDRE (Ed.); COTTENIER, STEFAAN (Ed.); PEREIRA, LINO (Ed.) INTERNATIONAL CONFERENCE ON HYPERFINE INTERACTIONS AND THEIR APPLICATIONS, July 3-8, 2016, Leuven, Belgium. Abstract... Leuven, Belgium: Instituut voor Kern- en Stralingsfysica, 2016.

    Abstract: FeRh ordered alloy crystallizes in the bcc B2 structure [1], presents first order phase transition from antiferromagnetic (AF) ordering at low temperature to ferromagnetic (F) state above 350 K [2], and shows significant magnetocaloric effect near RT [3]. Recently, FeRh alloy has also been considered as an interesting material for spintronics applications [4]. In the AF state, FeRh has compensated AFII-type magnetic structure with μFe=3.3 μB and μRh=0. In the F state of FeRh both Fe and Rh atoms have magnetic moments of μFe=3.2 μB and μRh=0.9 μB, respectively [5]. The Fe – Rh compounds were studied by Mössbauer spectroscopy (MS) on 57Fe [6, 7] and 119Sn probe nuclei [8]. In this work, we have, for the first time, investigated the HFs for 111Cd probe atoms in two FeRh samples of different composition by perturbed γ-γ angular correlation (PAC) spectroscopy in the range from 40 K to a temperature above the TC. The alloy Fe0.48Rh0.52 (A1 sample) is AF at low temperatures. At the temperature Tt = 345 K the first order phase transition is observed, and this compound becomes F at the temperatures lower than TC = 685 K. The alloy Fe0.52Rh0.48 (A2 sample) is only ferromagnetic below TC = 800 K. It was established that in both alloys 111Cd probes substitute only Fe ions. The HFs values extrapolated to 0 K were found to be B1(0) =8.70(5) T and B2(0) =5.53(5) T for AF and F ordering of A1 and A2 samples, respectively. The HF in the AF state is almost 60% higher than the HF in the F alloy. The dependences B1 (T) and B2 (T) show anomalous behavior. At Tt = 345 K, phase transition AF-F is accompanied by a sharp decrease in the HF at 111Cd probe nuclei. Earlier, an increase of the corresponding HFs was observed for 57Fe atoms and 119Sn impurity atoms in the region of AF-F transition by MS in [6] and [8]. Analysis of B1(T) and B2(T) has allowed to obtain the temperature dependences of the competing contributions BFe (T) and BRh (T) to the HFs on 111Cd probe nuclei in FeRh alloys.

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  • IPEN-DOC 23734

    TOMA, SERGIO H.; ALBERNAZ, MARTA de S.; BERNARDES, EMERSON S. ; SANTOS-OLIVEIRA, RALPH; ARAKI, KOITI. Targeted doubly labeled nanoparticles for tumor imaging. In: BRAZILIAN MEETING ON INORGANIC CHEMISTRY, 18th, September 25-30, 2016, São Pedro, SP. Abstract... 2016.

    Abstract: Diagnosing cancer tumors properly, with precision in the earliest as possible stages is fundamental to increase the success of the treatments and assure better and longer survival lifetime to the patients. In this direction the use of targeted nanoparticles, especially the ones decorated with monoclonal antibodies, has been the choice for the development of new more effective contrast agents, but the preparation method are generally cumbersome and inefficient. Described is in this report, 8 nm large SPIONs simultaneously conjugated with trastuzumabe and dtpa ligand. The antibody confers targeting properties while the chelating ligand the possibility of radiolabeling with 99mTc for SPECT imaging. Female Balb-c nude mice were xenografted with a breast cancer tumor model by subcutaneous injection of 2x106 MDA-MB-231 cells in the right flank and imaged with a gamma camera revealing high bioaccumulation of nanoparticles. No trombus and immune response leading to unwanted interaction and incorporation of nanoparticles by endothelium and organs, except by the kidneys, was observed in healthy mice. More than 80% of them is cleared by the renal pathway but the implanted tumor seems to increase the expression of HER2 receptors enhancing the uptake by all organs. However, even in this unfavorable situation the tumor concentrated much more radiolabeled SPIONs than the normal tissues giving a clear contrast, as expected for an efficient contrast agent for breast cancer imaging.

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  • IPEN-DOC 27010

    POTIENS JUNIOR, ADEMAR ; COSTA, NATHALIA ; CORREA, EDUARDO ; SANTOS, LUCAS ; VIVOLO, VITOR ; POTIENS, MARIA da P. . Tandem KAP meters calibration parameters by Monte Carlo Simulation using reference RQR radiation qualities. In: CLEMENT, CHRISTOPHER (Ed.); VALENTIN, JACK (Ed.); OGINO, HARUYUKI (Ed.); FOOTE, DEVON (Ed.); REYJAL, JULIE (Ed.); OMAR-NAZIR, LAILA (Ed.) INTERNATIONAL CONGRESS OF THE INTERNATIONAL RADIATION PROTECTION ASSOCIATION, 14th, May 9-13, 2016, Cape Town, South Africa. Abstract... The International Radiation Protection Association, 2016. p. 702-702.

    Abstract: The Kerma-area product quantity can be obtained by measurements carried out with a kerma-area product meter (KAP) with a plane-parallel transmission ionization chamber mounted on the X ray system. It is the integral of the air kerma over the area of the X ray beam in a plane perpendicular to the beam axis. This quantity has been important to establish the diagnostic reference levels (DRLs) all over the word. In this work the MCNP5 code was used to calculate the imparted energy in the air cavity of KAP meter and the spatial distribution of the air collision kerma in entrance plan of the KAP meter. From these data, the air kerma-area product (KAP) and the calibration coefficient for the KAP meter were calculated and compared with those obtained experimentally. The X-ray tube was easily modelled as well the complete tandem calibration set up was possible. The spectra of the diagnostic radiology RQR reference qualities measured were used as a source definition in the input card for the Monte Carlo simulation. The clinical KAP meter calibration coefficients were obtained experimentally and by Monte Carlo simulation. The differences between those values were about 2%, except for RQR 10 (5.45%). The uncertainties in Monte Carlo simulation were less than 0.5% in all cases and the FOM (Figure of Merit) was constant for a number of histories of 1 million.

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  • IPEN-DOC 23735

    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.

    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.

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  • IPEN-DOC 23767

    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.

    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.

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  • IPEN-DOC 23397

    TINTI, VICTOR B.; FONSECA, FABIO C. ; FLORIO, DANIEL Z. de. Synthesis of Ni nanoparticles in lanthanum chromite ceramic matrix. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 657-657.

    Abstract: Lanthanum chromite is a well-known interconnector for solid oxide fuel cells. It presents electronic conductivity at high temperatures. Moreover it is very stable in oxidizing and reducing atmospheres. Due to its high stability this material is a promising matrix to produce and stabilize nanoparticles by exothermal reaction. The objective of the present work is to synthesize and stabilize nickel nanoparticles in a stable ceramic matrix. Compounds of (La1-xSrx)a(Cr1-yNiy)O3 (x and y = 0, 0.1, and 0.2; a = 1, and 0.8) were synthesized by Pechini method. The powders were heat treated in air at 1300 °C and 1600°C in attempt to solubilize NiO in the matrix. Then the samples were exposed to a reducing treatment in H2(g) flux at 900°C per 8 hours. XRD measurements were made using a D8 Focus, Bruker AXS. The data was acquired in a range of 2θ from 20° to 90°, with a step of 0,02° per second. Magnetic properties were investigated utilizing a SQUIDVSM from Quantum Design. Magnetic moment at constant magnetic field (100 Oe and 1000 Oe) was measured in a range of 2K to 300K. Analyses with variable magnetic field were performed at 2K, 196K and 390K in a rage from -5 up to 5 T. Samples were observed using TEM technique. The XRD results showed that the stoichiometric samples achieved desiderate phase. Compounds without Sr and non-stoichiometric lanthanum site showed an incomplete nickel solid solution. The addition of 10% of Sr decreases the Néel temperature from 289 K to 285K. Ni doping created a stronger effect, lowering the temperature down to 267 K , in the sample with 10% of dopant. After reduction is possible to observe peaks of Ni in the XRD, indicating that nickel was exoluted form the matrix. Images of TEM confirm the presence of nanoparticles with an approximate diameter of 3 nm. The reducing treatment increased the magnetic response.

    Palavras-Chave: ceramics; chromium oxides; heat treatments; lanthanum oxides; magnetic properties; nanoparticles; nickel; synthesis; transmission electron microscopy; x-ray diffraction

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  • IPEN-DOC 27066

    MATOS, BRUNO R. ; MORAES, LETICIA P.R. ; SANTIAGO, ELISABETE I. ; FONSECA, FABIO C. . Synthesis and proton conductivity of Nafion with addition of CsHSO4. In: INTERNATIONAL CONFERENCE ON ADVANCED ENERGY MATERIALS, 1st; INTERNATIONAL CONFERENCE ON ADVANCED NANOMATERIALS, 8th; INTERNATIONAL CONFERENCE ON HYDROGEN ENERGY, 2nd, September 12-14, 2016, Guildford, England. Abstract... 2016. p. 53-53.

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  • IPEN-DOC 23700

    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.

    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.

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  • IPEN-DOC 23756

    PAZOS, ILEANA; AN, JUNG-CHUL; GRIMALD, NATASCIA; TAKINAMI, PATRICIA Y. ; POSTER, DIANNE; DISPENZA, CLELIA; DEL MASTRO, NELIDA ; VREELAND, WYATT; AL-SHEIKHLY, MOHAMAD. Synthesis and modification of functional polymer nanogels using pulsed-electron beam ionizing irradiation. In: MEETING OF THE IONIZING RADIATION AND POLYMERS SYMPOSIUM, 12th, September 25-30, 2016, Peninsula of Giens, France. Abstract... 2016. p. 55-55.

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  • IPEN-DOC 23804

    MITTANI, JUAN; GUGLIOTTI, CAROLINE ; MORIYA, KAREN; TATUMI, SONIA. Synthesis and luminescence studies of Mgo:Tb for use in radiation dosimetry. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 18th, July 03-08, 2016, Munich, Germany. Abstract... 2016.

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  • IPEN-DOC 23587

    SILVA, F.R.O. ; YOSHITO, W.K. ; COSENTINO, I.C. ; BRESSIANI, A.H.A. ; LIMA, N.B. . Synthesis and characterization of new crystalline mesoporous beta-tricalcium phosphate nanoparticles. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIENCIA DOS MATERIAIS, 22., 06-10 de novembro, 2016, Natal, RN. Resumo... 2016. p. 1699.

    Abstract: Calcium phosphates, including hydroxyapatite [HA, Ca10 (PO4)6(OH)2] and beta-tricalcium phosphate [B-TCP, Ca3(PO4)2], are the main mineral component of bone tissue and teeth. The synthetic calcium phosphates are of special interest in medicine because of their biocompatibility, bioactivity and non-toxicity. B-TCP is advantageous to HA for drug delivery system due to their high solubility and controllable bioresorption rate. To obtain B-TCP, the literature reports the transformation of calcium deficient hydroxyapatite (CDHA) to ?-TCP since it couldnot be synthesized directly in aqueous solution, until now. For the first time, B-TCP have been successfully synthesized by wet precipitation method at room temperature with a Ca/P molar ratio equal to 1.5 and pH at 6. The present work is concerned with the preparation of B-TCP and it characterization through XRD, BET and TEM analysis. The results showed well-characterized peaks of crystalline pure B-TCP (JCPDS 09-0169) for the dried powder, with a high BET surface area of 574 ± 7 (m2/g). The TEM micrographs exhibits mesoporous structure, which is suitable as a drug carrier.

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  • IPEN-DOC 23726

    MONTEIRO, NATALIA K. ; SILVA, GABRIEL A.C. da ; FONSECA, FABIO C. . Synthesis and characterization of a doubleperovskite anode for solid oxide fuel cells. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... 2016. p. 648-648.

    Abstract: Solid oxide fuel cells are one of the most efficient devices for the direct conversion of the chemical energy of a fuel into electricity. Nonetheless, standard solid oxide fuel cells (SOFC) with Ni/yttria-stabilized zirconia cermet anode have a serious decrease of their lifetime when fed with carbon-containing fuels due to coke formation. Ceramics with perovskite structure have been pointed out as good candidates to anodes. In this study, the Pr0.5Ba0.5MnO3 was used as the precursor phase of the double perovskite PrBaMn2O5+δ (PBMO), present at reducing conditions. The transport and catalytic properties were studied in the pristine compound and in Ru-doped samples Pr0.5Ba0.5Mn1-xRuxO3 (Ru-PBMO). Ru substitution at the B-site is expected to enhance the catalytic properties of the ceramic toward ethanol for SOFC’s running on such fuel. Simultaneous thermogravimetric and differential thermal analysis (TG/DTA) were used to monitor the thermal evolution of polymeric resins up to 1400 °C. Ceramic powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses. The electrical properties of sintered samples were evaluated by dc 4-probe technique, in the 25 - 800 °C temperature range. The TG/DTA and XRD data show mass loss stabilization and crystalline phase formation occurring at ~800°C. The evolution of the XRD pattern upon calcining temperature indicated the formation of single phase of Ru-PBMO samples at ~1100°C. The initial results suggest that PBMO and PBMO-Ru compounds are promising SOFC anodes for carbon containing fuels.

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  • IPEN-DOC 23393

    REIS, ADRIANO G. dos ; REIS, DANIELI A.P.; ABDALLA, ANTONIO J.; COUTO, ANTONIO A. ; SUGAHARA, TARCILA; OTUBO, JORGE. Surface characterization of plasma nitrided maraging 300 steel. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 865-865.

    Abstract: Maraging steels belong to a class of high strength steels with the combination of strength and toughness that are among the highest attainable in general engineering alloys. The term maraging is derived from martensite age hardening and denotes the age hardening of a low carbon, iron–nickel lath martensite matrix. These steels typically have very high nickel, cobalt and molybdenum and very low carbon content [1]. For aeronautical components requiring high strength and good wear resistance, such as, slat track, maraging steel possesses high strength, and good wear resistance can be achieved by plasma nitriding process, without sacrificing the strength of the bulk material [2]. In the present work, the surface of maraging 300 steel solution annealed and plasma nitrided was studied by atomic force microscopy (AFM) and microhardness. Samples were solution annealed at 820ºC for 1 h and then plasma nitrided by passing the gas mixture of H2 an N2 gases in the ratio of 3:1 under vacuum and it was carried out at 480ºC for 3 hours. 3D representation of nitrided and un-nitrided samples showed the nitrided samples with peak-valley structure, and the root mean square increase from 52 nm to 73 nm after superficial treatment. Plasma nitriding was effective to increase the microhardness from 331 HV to 1010 HV, and it is associated with the simultaneous aging and the iron nitrides formed.

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A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.

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O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.