Navegação Eventos - Resumos por ano de publicação "2022"

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  • IPEN-DOC 29432

    BASTOS, V.M. ; LIERMANN, C.; DALMAZO, R.; LARA, J.A. ; JESUS, E.R.; MUCSI, C.S. ; ROSSI, J.L. . The clinching and spot welding of advanced high strengths dual-phase steel. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... 2022.

    Abstract: In lightweight construction, the lowest use of raw materials is a reality. In the automotive sector, the objective is the production of vehicle bodies following the concept of light construction and at the same time suitably rigid and resistant to collisions. In addition, the assumptions of reducing fuel consumption and the volume of vehicle emissions must be met. The materials for the automotive sector, the use of advanced dual-phase steel of 1.3 GPa of mechanical strengths, whose ferrite/martensite microstructure gives ultra-high tensile strength, can be spot welded by resistance and/or joined by clinching. The application of this steel, up to 1.50 mm thick, proves to be attractive to replace components obtained by hot stamping in the automotive sector, reducing the cost of industrializing components such as side protection bars, floor reinforcements and other relevant components in the system of vehicle collision management. The present work aimed to correlate aspects of clinching and resistance spot welding joints, regarding tensile strength. Changes in the clinching anchor region and in the heat-affected zone in the spot weld were evaluated in microstructural and microhardness terms. The loads observed during the peeling tests with clinching with complete neck rupture were higher than when the mechanical union uncoupling took place. As for spot welding, despite the drop in microhardness in the heat-affected zone and the shear in this region in the peeling test, the mechanical strength was still about twice as high as in clinching. Even though, the results allow one to conclude that, under the experimental conditions of the present work, clinching is feasible for ultra-high strength materials.

    Palavras-Chave: welded joints; resistance welding; tensile properties

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  • IPEN-DOC 28958

    D'AGOSTINO, GIANCARLO; BLAAUW, MENNO; DUNG, HO M.; LUZIO, MARCO di; JACIMOVIC, RADOJKO; DIAS, MAURO da S. ; SEMMLER, RENATO ; SLUIJS, ROBBERT van; BARRADAS, NUNO P.. The 2021 IAEA software intercomparison for k0-INAA. In: INTERNATIONAL k0-USERS’ WORKSHOP, 8th, June 6-10, 2022, Ljubljana, Slovenia. Abstract... Ljubljana, Slovenia: Institut "Jožef Stefan", 2022. p. 17-17.

    Abstract: In order to establish the variation between results due to software implementation in mass fractions as measured by the k0-method for INAA, the IAEA has organized a software intercomparison. A complete set of test spectra and associated information was assembled. Efficiency curves, neutron spectrum parameters, correction factors and mass fractions were calculated with the participating programs (list of program names here) using identical peak areas. In this paper, we report on the observed discrepancies, causes, remedies and future software developments. The test data, as well as expected and certified mass fractions of the BCR-320R channel sediment sample material will be made available to all.

    Palavras-Chave: neutron spectra; neutron activation analysis; computer codes; comparative evaluations

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  • IPEN-DOC 29173

    AYLLON, R.M. ; FURLAN, M.R.; EL HAJJ, T.M.; SILVA, P.S.C. . Th-232 radiological aspects of carbonate niobium mining waste use as agricultural amendment. In: LIMA, FERNANDO de A. (Org.); DANTAS, BERNARDO M. (Org.); LEVY, DENISE (Org.) INTERNATIONAL JOINT CONFERENCE RADIO, 6th; CONGRESSO INTERNACIONAL DE RADIOPROTEÇÃO INDUSTRIAL, 9th; CONGRESSO DE PROTEÇÃO CONTRA AS RADIAÇÕES DOS PAÍSES DE LÍNGUA PORTUGUESA, 8th; CONGRESSO BRASILEIRO DE PROTEÇÃO RADIOLÓGICA, 7th; ENCONTRO NACIONAL DE MULHERES DO SETOR NUCLEAR, 1st, August 15-19, 2022, Poços de Caldas, MG. Abstract... 2022. p. 252-253.

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  • IPEN-DOC 29999

    SILVA, CAMILA R. ; RIBEIRO, MARTHA S. . Terapia fotodinâmica associada à quimioterapia em células de câncer de mama triplo-negativo. In: RIBEIRO, MARTHA S. (Ed.) FORUM ON-LINE DE TECNOLOGIAS DA LUZ NA SAUDE, 3., 26-28 de maio, 2022, São Paulo, SP. Resumo... 2022. p. 25-25.

    Abstract: INTRODUÇÃO: O câncer de mama triplo-negativo (TNBC) representa 20% das incidências de câncer de mama com uma mortalidade estimada em 40%. As principais características desse tipo de câncer seriam o seu alto poder de metástase e resistência aos tratamentos convencionais como a quimioterapia. Diante disso, há uma crescente busca por terapias adjuvantes para auxiliar o tratamento do TNBC. Nesse contexto, a terapia fotodinâmica (TFD) têm se mostrado promissora no tratamento de diversos tipos de câncer e recentemente a literatura descreve o seu uso em associação com os tratamentos convencionais para auxiliar no combate ao câncer. OBJETIVO: Associar a TFD com quimioterapia no tratamento de células TNBC. METODOLOGIA: Células TNBC, células de câncer de mama responsivas à quimioterapia (MCF-7) e células não tumorais de mama (MCF-10A) foram cultivadas, semeadas (2 x 104 células) e após a TFD usando a porfirina TMPyP (30 μM) e luz vermelha (λ= 660 ± 11 nm) com as fluências de 20 J/cm² e 50 J/cm² receberam doxorrubicina (DOX) na concentração de 5 μg/mL. Após 24-h da quimioterapia, a atividade mitocondrial foi avaliada para todos os grupos experimentais (n=6). RESULTADOS: As células MCF-7 e MCF-10A usadas como controle apresentaram redução significativa na atividade mitocondrial quando expostas à DOX. Por outro lado, as células TNBC não apresentaram redução estatisticamente significativa quando submetidas ao mesmo protocolo. No entanto, na associação da TFD+DOX, as células TNBC apresentaram redução significativa na atividade mitocondrial, independente da fluência usada. CONCLUSÃO: A associação da TFD com doxorrubicina apresentou menor atividade mitocondrial para as células TNBC.

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  • IPEN-DOC 29394

    RIBEIRO, E.P. ; COUTO, A.A. ; OLIVEIRA, R.R. ; VICENTE, J.G.. Tensões residuais induzidas no aço inoxidável austenítico F138 após tratamento superficial de shot peening e nitretação a plasma. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... 2022.

    Abstract: O tratamento mecânico superficial de shot peening, comumente utilizado para aprimorar propriedades mecânicas de superfície em materiais, como aumentar a resistência a fadiga e ao desgaste, induz deformações na rede cristalina do material, caracterizadas pela presença de tensões. Adicionalmente, a nitretação a plasma outro tratamento superficial utilizado para minimizar falhas em aços inoxidáveis austeníticos, pode produzir camadas superficiais resistentes, compostas pelo alojamento de átomos intersticiais na estrutura austenítica, elevando a dureza da camada. Dessa forma, o presente trabalho teve como objetivo estudar a tensão residual e a camada formada na superfície do aço inoxidável austenítico F138, após diferentes condições de tratamento. Foram abordadas diferenças relacionadas à aplicação de nitretação a plasma após tratamento mecânico de shot peening. Para a verificação da tensão residual foi utilizada difração de raios-x usando método senˆ2(psi). Com intuito de analisar a morfologia da superfície e da camada formada, as amostras foram analisadas por microscopia eletrônica de varredura e difração de raios-x. O tratamento de shot peening prévio à nitretação a plasma promove formação de camada menos homogênea com presença de microtrincas e aumento da tensão residual induzida. A nitretação a plasma ocasionou a formação de nitretos de ferro e austenita expandida. Com a efetiva indução de tensão residual na superfície, os tratamentos de shot peening e nitretação a plasma são métodos eficientes para aprimoramento das propriedades do material.

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  • IPEN-DOC 29592

    SANTOS, SIMEI T.S.; BRITO, HERMI F.; TEOTONIO, HERCULES E.S.; FELINTO, MARIA C.F.C. ; MALTA, OSCAR L.. Synthesis, modification surface and characterization of tungstate/molybdate of zinc, doped with lanthanide ions [ Zn1-xREx(WO4)y(MoO4)z] (y or z = 0, 0.5, 1). In: SILVA, FERNANDO de C. da (Org.) REUNIAO ANUAL DA SBQ, 45., 31 de maio - 3 de junho, 2022, Maceió, AL. Resumo... São Carlos, SP: Aptor Software, 2022. p. 535-535.

    Abstract: A class of materials with the general formulation of MIMIII(XO4)2 (MI=Alkali metal, MIII = trivalente metal and X = W or Mo) with structural importance and diferente properties exposed to the attention of researchers, especially when doped with rare earth ions, which give the material luminescent properties. These properties can make the material promisingly important for diverse applications, such as solar cells, light converting devices and sensors, depending only on the changes in its structure and surface. This work was synthesized using co-precipitation method from aqueous solutions tungstates and molybdates of zinc doped with rare earth íons (Scheme 1a [Zn0.95Eu0.05WO4],1b [Zn0.95Eu0.05(WO4)0.5(MoO4)0.5],1c [Zn0.95Eu0.025Tb0.025WO4]) and coated with a thin layer of sílica (scheme 1d) using the hydrolysis and condensation of tetraethoxysilane (TEOS). For the phenantroline ligand functionalization, 3- (chloropropyl)triethoxy-silane (CPES) was grafted onto the particle surfaces in their aqueous suspensions, and bound to modified phenanthroline. For the synthesis of doped tungstates and molybdates, equivalent amounts of zinc, terbium, and europium chlorides were added under stirring at 70 °C for 1h. After drying, the material was ground with TEOS, water, ethanol and remained (with catalyze acid) for 3h at 70 °C under constant agitation. The 1,10- Phenantroline (scheme 1e) has been nitrated (H2SO4/HNO3) (scheme 1f) and reduced (Sn/HCl) (scheme 1g and infrared) to then be coupled to the modified particle. The final product was characterized. We are currently improving and studying synthesis conditions and aplications.

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  • IPEN-DOC 29195

    SANTOS, BIANCA P.S. ; KODAMA, YASKO ; SANTIAGO, ELISABETE I. . Synthesis and characterization of fluoropolymer membrane using RIG and reversible addition-fragmentation- chain-transfer (RAFT) method for fuel cell application. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022.

    Abstract: Anion exchange fuel cells (AEMFC) have attracted widespread attention in the last years and are considered one of the most promising environmentally friendly power generations. An auspicious way to produce well-controlled structures for applications as anion exchange membrane is using the radiation-induced grafting method (RIG) with RAFT agents [1]. RAFT consists of a reversible addition fragmentation chain transfer of free radicals and allows the control over polymeric molecular weight and copolymer topology and other properties. Ethylene tetrafluoroethylene (ETFE) is a type of fluoropolymer that can be applied in AEM due to its lightweight, excellent chemical and thermodynamic stability, and greater resistance to radiation ageing [2]. In this study, we investigated the beneficial outcomes of performing the ETFE-AEM synthesis in a fully controlled manner by RAFT polymerization using RIG. The influence of RAFT agent on physical (mechanical behavior, dimension), chemical (such as IEC), thermal properties (TGA and DSC) were investigated in detail for future and evaluated in AEMFCs. ETFE-grafting-Vinylbenzyl chloride (VBC) using RAFT agent controlled grafting degree of membrane and improved mechanical properties compared to conventional method of grafting.

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  • IPEN-DOC 29199

    VENANCIO, EVERALDO C.; MORAES, EIDER H. de; ALVARENGA, KLEBER da S.M.; SILVA, LUIS M.G. da ; LEMOS, HUGO G. de. Synthesis and characterization of conducting polymers/graphene oxide derivatives and conducting polymers/carbon black nanocomposites. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022.

    Abstract: The interest on the properties of conducting polymers (CP)/graphene oxide (GO), CP/reduced graphene oxide (rGO), and CP/carbon black (CB) has been related to the possibility of the different applications of these materials, such as in sensors, energy storage and conversion and biological applications [1-3]. Our research group has been studying the properties of these materials for application in different areas. Our main goal is to obtain and to control the synthesis of GO and rGO and combine these materials with CP, as well as to study the effect of different CP:CB composition ratios on its properties. These CP/OG and CP/rGO materials are versatile platforms for application in water filtering and purification systems, protection of metals against corrosion, and energy storage and conversion, which includes solar cells and supercapacitors.

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  • IPEN-DOC 29479

    UEHARA, VANESSA B. ; DEL MASTRO, NELIDA L. . Sustainable packaging materials for the food industry: role of radiation technology. In: INTERNATIONAL CONFERENCE ON APPLICATIONS OF RADIATION SCIENCE AND TECHNOLOGY, 2nd, August 22-26, 2022, Vienna, Austria. Abstract... Vienna, Austria: International Atomic Energy Agency (IAEA), 2022.

    Abstract: Food packaging keeps food safe and fresh and protects products during transport, delivery, and storage. On the other hand, packaging also fills trash containers and landfills, lasting far longer than the products it was made to contain and can also transfer chemicals into our food, with unknown health effects. Disposing massive quantities of wastes generated by nonbiodegradable packaging material pave ways for the study of biopolymers as alternative materials for food packaging. Ionizing radiation is the most effective means to disinfect dry food ingredients and an adequate phytosanitary treatment of food and agricultural commodities. The irradiation of food products is today a mature technology, effective, broad spectrum, residue free that can play an important role in food safety and food security. On the other hand, radiation processing of polymers is an attractive option for the food packaging industry worldwide. Practically every type of physical and chemical assay technique has been utilized for radiation studies on biological molecules. The aim of this article is to present some aspects of our own work on the development of edible films based on a combination of polysaccharide/protein - cassava starch and soy isolate protein - among the general application of irradiation technology on packaging materials.

    Palavras-Chave: food industry; packaging; biodegradation; food processing

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  • IPEN-DOC 29296

    ZAMBONI, C.B. ; SALVADOR, V.L. ; LEWGOY, H.R. ; SILVA, R.Y.R.; MEDEIROS, I.M.M.A. . Sulfur concentration in saliva using EDXRF technique. In: ENCONTRO DE PRIMAVERA DA SOCIEDADE BRASILEIRA DE FÍSICA, 2.; REUNIÃO DE TRABALHO SOBRE FÍSICA NUCLEAR NO BRASIL, 45.; ENCONTRO NACIONAL DE FÍSICA DE PARTÍCULAS E CAMPOS, 42.; RENAFAE WORKSHOP, 26-29 de setembro, 2022, Natal, RN. Resumo... São Paulo, SP: Sociedade Brasileira de Física, 2022.

    Abstract: In the last decade, human saliva has been used for clinical analyses by investigations of its molecular components, hormones, enzymes, proteins and more recently for inorganic elements. The major advantage for using saliva in diagnosis is the ease access collection and be non-invasive. Saliva consists mainly of water (~98%) in addition to electrolytes and enzymes. Particularly, sulfur levels in saliva can act as an indicator of an inflammatory process of the gingiva (gingivitis and halitosis), which has a high incidence in the Brazilian population. The World Health Organization (WHO) estimates that one in four adults has some type of bacterial infection. Specifically, halitosis (chronic bad breath) is overlooked and has several possible causes: cavities, broken fillings, and poor partial or full dentures cleaning. This oral dysfunction can be classified as physiological or pathological. Physiological halitosis is caused by inadequate oral hygiene. It is significantly related to symptoms of depression, while pathological halitosis is a result of chronic inflammatory periodontal disease. In this investigation, sulfur concentration in saliva were investigated using Energy Dispersive X-ray Fluorescence (EDXRF) technique. Unstimulated whole saliva samples (~3mL) were collected from healthy subject, in a dental office. All participants were inhabitants of São Paulo city. Samples were excited and measured using a portable X-Ray Spectrometer: Ag X-Ray target and Si Drift detector (25 mm2 x 500 μm /12.5 μm Be window) and counting time of 600s measured with 30kV and 10μA. The spectrometer was calibrated for sulfur using linear regression method for concentration up to 500 ppm. The availability of accurate reference value for sulfur in human saliva provides a scientific basis for biomedical research of specific diseases in oral cavity. In addition, the use of the XRF compact spectrometer to perform clinical tests on saliva is a fast and effective procedure, within the quality standards required by Good Laboratory Practices (GLP) for early diagnosis in dentistry.

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  • IPEN-DOC 29561

    LEBRE, DANIEL T. ; THIPE, VELAPHI C. ; COTRIM, MARYCEL E.B. ; BUSTILLOS, JOSE O.V. . Sugarcane beyond the sweetness: one application in green chemistry. In: SIMIONATO, ANA V.C. (Coord.) IBEROAMERICAN CONFERENCE ON MASS SPECTROMETRY, 3rd, December 10-15, 2022, Rio de Janeiro, RJ. Abstract... Campinas, SP: Sociedade Brasileira de Espectrometria de Massas - BrMASS, 2022. p. 72-73.

    Abstract: Introduction: Sugarcane is a well known source or raw material to produce sugar, alcohol and bioethanol. Brazil is the world’s largest producer of sugarcane (Saccharum sp.), followed by India, China, and Bangladesh, all of which generate significant amounts of bagasse as a by-product of their sugar and bioethanol mills in each of these countries.1 The sugarcane bagasse (SCB) is a fibrous material remaining after the plant's stalk pressing process used to extract the sweet juice used for the industrial production of sugar and alcohol. SCB is one of the most economically viable and readily accessible agro-industrial residues in the world, particularly in tropical regions.2 Recently SCB has taken attention in scientific community, manly in chemistry, because exhibits strong biosorption capabilities, which are defined as the passive sorption of organic and inorganic substances in soluble or insoluble forms from an aqueous solution utilizing decomposing biological materials. Sarker at al. published a comprehensive study of the SCB biosorption properties and their application.3 The purpose of this work is to demonstrate the continued applicability of SCB as SPE biosorbent bed for extracting synthetic hormones (ethynylestradiol, drospirenone and levonogestrel) from pharmaceutical industrial effluent prior LC-MS/MS quantitative analysis. Methods: SPE: SCB 75 μm bed at a concentration of 50 mg was used to pack empty 1 cc (mL) SPE cartridges containing retained frits. To compare the outcomes of the recoveries, the following commercial (cSPE) were used: Oasis HLB 30 mg, 1 mL; Discovery DSC-18 50 mg, 1mL and Sulpeclean Envi-Carb, 100 mg, 1 mL. Conditioning: 1 mL of methanol and 1 mL of water; Load: 1 mL of sample; Wash: 2x 0.75 mL of water; Dry cartridge: under synthetic air flow; Elution: 2x 0.3 mL MeOH. Prior to LC-APCI-MS/MS analysis, the MeOH extracted sample residue was dried in 10 mL class assay tube under N2 gas flow at 40 ºC using and dissolved in 1 mL of 50% acetonitrile/50% water (v/v) solution. Results: The sorption effectiveness of the SCB bed was evaluated using the following experimental parameters in comparison to existing and commercially available SPE (cSPE) cartridges: (i) SCB re-use (recycling); (ii) load concentration variation; (iii) breakthrough (mass/volume capacity); (iv) pH variation; (v) extraction solvents variation (vi) particle size; and (vii) suitability for use in industrial effluent. The SCB SPE results (accuracy data ranged from 99% to 120%) were significantly acceptable for all the synthetic hormones compounds tested and analyzed in industrial effluent samples and comparable to Oasis HLB (benzene copolymer) SPE material and the others. Conclusion: Our overarching objective for developing SCB as SPE sorbent material for the analysis of synthetic hormones from industrial effluents has expanded the research area and/or application of SCB, which the biomass is often burnt to generate energy in the sugar and alcohol mills.

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  • IPEN-DOC 29176

    BUENO, L.K. ; VILLANI, D. ; RODRIGUES JUNIOR, O. ; POTIENS, M.P.A. . Study on depth of measurement and volume variation of nuclides used in nuclear medicine for “in situ” ionization chamber characterization: an experimental and Monte Carlo comparison. In: LIMA, FERNANDO de A. (Org.); DANTAS, BERNARDO M. (Org.); LEVY, DENISE (Org.) INTERNATIONAL JOINT CONFERENCE RADIO, 6th; CONGRESSO INTERNACIONAL DE RADIOPROTEÇÃO INDUSTRIAL, 9th; CONGRESSO DE PROTEÇÃO CONTRA AS RADIAÇÕES DOS PAÍSES DE LÍNGUA PORTUGUESA, 8th; CONGRESSO BRASILEIRO DE PROTEÇÃO RADIOLÓGICA, 7th; ENCONTRO NACIONAL DE MULHERES DO SETOR NUCLEAR, 1st, August 15-19, 2022, Poços de Caldas, MG. Abstract... 2022. p. 385-386.

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  • IPEN-DOC 29187

    QUEIROZ, FERNANDA M.; RIBEIRO, GLEICY de L.X. ; CASTRO, RENATO S. de; SANTOS, ROGERIO G. dos; PORTO, JOAQUIM F.B.; SILVA, LEANDRO S. da; VIEIRA, ALEXANDRE ; SANTOS, LUIS U. dos; TERADA, MAYSA ; ROSSI, WAGNER de ; COSTA, ISOLDA . Study of the effect of nanosecond laser texturing on the corrosion behavior of Ti6Al4V and Ti6Al4V parts produced by powder bed fusion. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022.

    Abstract: Biomedical industry demands surfaces that facilitate osteointegration, especially in implants. Currently, this functional surface is obtained by coating the metallic implant with ceramic materials, such as hydroxyapatite, or with polymeric materials. However, these layers can suffer from detachment, residual stresses, and cracks during the process, favoring implant corrosion. Laser texturing is a surface structuring process that can improve osteointegration by generating functional hydrophilic surfaces. An alternative for the manufacture of components used as biomaterials can be additive manufacturing, followed by laser texturing. The 3D manufacturing process allows obtaining parts with complex geometry, weight reduction, and customized products that can serve the dental and biomedical sector. Combining metallic additive manufacturing with laser texturing would be an alternative in obtaining parts with functional hydrophilic surfaces, which improves osteointegration. In both cases, a careful study of the corrosion behavior of the surfaces obtained is necessary, since the evolution of this phenomenon can influence the osteointegration of the implant, causing the release of metal ions in the body and even the rejection of the component. This study compared the corrosion behavior of laser texturing Ti6Al4V components with components manufactured using laser power bed fusion of the same alloy followed by laser texturing. The Ti6Al4V components by laser powder bed melting were obtained by varying the scanning speed and power using a Yb laser. For laser texturing of the surfaces, a fiber optic laser of Yb was used. The corrosion behavior of the surfaces was evaluated by electrochemical impedance spectroscopy and characterized by SEM. The wettability was determined by the sessile drop method. The results showed the differences in the corrosion behavior of the surfaces produced by the different methods, in the hydrophilic character and microstructure.

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  • IPEN-DOC 29189

    BUGARIN, ALINE de F.S. ; VIVEIROS, BARBARA V.G. de ; TERADA, MAYSA; SILVA, LEANDRO S. da; GUILHERME, LUIS H.; NEVES, MAURICIO D.M. das ; COSTA, ISOLDA . Study of the corrosion resistance of duplex and lean duplex steels welded by the gas tungsten arc welding double fusion (GTAW-DF) applied in the construction of tanks. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022.

    Abstract: Duplex stainless steels has great technological importance due to the combination of high mechanical strength, high toughness and excellent corrosion resistance. New methods of joining these materials have been investigated and updated, with better cost-benefit. In this work, joints welded by the TIG process with root pass by the double-fusion method (GTAW-DF), typically applied in the construction of tanks for the citrus juice and biotechnology industry were investigated. The welding process of steels changes in its microstructures forming of deleterious precipitates which decrease the corrosion resistance. Thus, the aim of this work was to evaluate and compare the corrosion resistance after welding by the GTAW-DF process of similar joints of lean duplex 2101 steel and dissimilar joints of 2205 and 2304 steels, duplex and lean duplex respectively, both used in the citrus juice industry. Samples were made using optimized welding parameters under corrosion resistance criteria. Microstructural characterization was performed by metallographic etching and observation by optical microscopy (OM) and by scanning electron microscopy (SEM). Mechanical properties were evaluated by microhardness test. Corrosion resistance was evaluated by electrochemical tests by the double loop electrochemical potentiokinetic reactivation test (DL-EPR) and potentiodynamic polarization test. The results showed that the welding process caused microstructural changes in the materials, and that after welding the most susceptible regions to corrosion were in the fusion line and in the thermally affected zone. When analyzing the two welding conditions, it was observed that the welded samples with higher heat input showed lower tendencies to intergranular corrosion.

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  • IPEN-DOC 29423

    FABRIM, Z.E. ; SANTOS, G.T.; TIMM, M.d.; ROSSI, J.L. ; FICHTNER, P.F.. Study of ODS formation by ion-beam implantation of Al+ and O+ on the AISI 316L steel and this influence in the He bubble grown. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... 2022.

    Abstract: A class of materials namely oxide dispersion strengthened (ODS) steels has been studied as structural materials for IV generation fission reactors and fusion reactors. The ODS shown to be effective in changing mechanical, thermal properties and resistance to swelling at high temperatures due to the greater thermal stability of the oxides combined with the insertion of new interfaces that serve as a vacancy trap and displacement fixation points. In this work the ion-beam implantation of Al+ and O+ was applied by the ion-beam synthesis to synthesize ODS in AISI316L austenite steel that is an important structural material for the fusion and fission reactors considering the corrosion resistance at high temperatures. Also is present a preliminary study of nucleation and growth of He bubbles in the way to simulate the swelling process and this behavior under the presence of the oxide dispersions. The samples were characterized by TEM, SAED and STEM-EDX techniques. SAED and EDX measurements show that the precipitates formed in samples implanted only with O and in samples implanted with Al and O are chromium oxide. Furthermore, STEM-EDX analyses show that no Al signal was observed neither in the precipitates nor in the matrix. The oxide precipitates are formed during the implantation procedure, with no need to undergo thermal activation processes. The Al implantation participates in second phase precipitation, acting in the production of vacancies during implantation and consequently enhancing the nucleation rate of the ODS. Temperature effects were also assessed in this study. At 550 ºC the influence of temperature in the thermodynamics of the system is few prominent, with precipitates and He bubbles’ sizes remaining quite stable. In other way, at 700 ºC is observed a drastic change in the geometry of the precipitates that become faceted in coherent interfaces whit the austenitic matrix. Regarding the He bubble system, it was observed lower tendency of growth in the samples containing the ODS. So, the oxide particles produced by ion-beam synthesis are an efficient way to hinder the growth of the inert gas bubbles, indicating a possible way for the study of the swelling process in the AISI316L.

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  • IPEN-DOC 29166

    ALMEIDA NETO, J.O. ; DAMATTO, S.R. ; MADUAR, M.F. ; LEONARDO, L. ; TEIXEIRA, L.F. ; DOMINGOS, R.M.. Study of 7Be activity concentration in rainfall as a function of sampling height. In: LIMA, FERNANDO de A. (Org.); DANTAS, BERNARDO M. (Org.); LEVY, DENISE (Org.) INTERNATIONAL JOINT CONFERENCE RADIO, 6th; CONGRESSO INTERNACIONAL DE RADIOPROTEÇÃO INDUSTRIAL, 9th; CONGRESSO DE PROTEÇÃO CONTRA AS RADIAÇÕES DOS PAÍSES DE LÍNGUA PORTUGUESA, 8th; CONGRESSO BRASILEIRO DE PROTEÇÃO RADIOLÓGICA, 7th; ENCONTRO NACIONAL DE MULHERES DO SETOR NUCLEAR, 1st, August 15-19, 2022, Poços de Caldas, MG. Abstract... 2022. p. 135-136.

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  • IPEN-DOC 29429

    CASINI, J.S.; FARIA, R.N. ; COSTA, I. . Study graphene-based coating 3D printing process in magnetic remanence and corrosion of NdFeB magnets. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... 2022.

    Abstract: This study belongs to the sector of new types of coatings. More particularly, this work refers to a 3D printing process (Fused Deposition Modeling) using thermoplastic polylactic acid (PLA) filament to create a rigid and plastic, non-conductive and anti-corrosion layer. Possibility of 3D printing a plastic layer using explored fused deposition modeling methods. With the use of additive manufacturing such a commercial magnet geometry N35 8x NdFeB can be devised to produce an efficient shielding film. Different 3D printed settings such as material type and layer thickness were printed. Types of 3D coatings were tested, articulated iron-impregnated polylactic acid (PLA-Fe) and graphene-impregnated polylactic acid (PLA-G). As the coating layer thickness increases, the remanence decreases from 1.193 mVs to 1.062 mVs for the PLA coating, from 1.209 mVs to 1.083 mVs for the PLA-Fe coating, and from 1.187 mVs to 1.070 mVs for the PLA-G coating. Visual tests of all aqueous NaCl solution coatings (0.5M and 1M) were performed, there were no evidence of corrosion tests for all coatings.

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  • IPEN-DOC 29449

    NOGUEIRA, K.M. ; VARCA, J.O. ; LIMA, C.S. ; CRUZ, C.C. da ; RIBEIRO, A.H. ; FREITAS, L.F. ; VARCA, G.H. ; LUGAO, A.B. . Solubility study of Kraft lignin for the development of electrospun nanofibers. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... 2022.

    Abstract: Lignin is a high-volume byproduct of paper manufacturing which has been explored in many research fields, especially for the development of fiber and nanofiber for biomedical applications [1,2]. This work presents a solubility study performed through gravimetry for kraft lignin considering its application for the development of electrospun nanofibers [3]. In practical terms, lignin was solubilized in alkaline aqueous solution, dimethylformamide and dimethylsulfoxide, at concentrations of 10, 15 and 20% (w/v) and varying temperatures of 25, 50 and 75 ºC, under constant stirring. After solubilizing, the solution was filtered, and the insoluble fraction was dried in the oven at 100 ºC. At 25 ºC lignin was insoluble in all solvents tested, as predicted using Hansen solubility parameters. Although the increase in temperature promoted lignin solubilization in all solvents tested, at the highest temperature assayed, the solubilization was facilitated, presenting the smallest levels of the insoluble fraction. Lignin was soluble in all solvents tested, and optimum solubility conditions were achieved using 10% lignin solutions (w/v), without significant insoluble fraction, and therefore ideal concentration for the development of lignin based fibers.

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  • IPEN-DOC 29564

    ANDRADE, MARIANA N. de ; OTOMO, JULIANA I. ; GIMENEZ, MAISE P. ; NASCIMENTO, LETICIA da S. ; NASCIMENTO, HENRIQUE B. do ; LEAO, PAULO H.B. ; CECILIO, PRISCILA de S. ; FERREIRA, JOAO C. ; BERGAMASCHI, VANDERLEI S. ; BUSTILLOS, OSCAR V. . Sodium interference in lithium isotope ratio analysis by Inductively Coupled Plasma Mass Spectrometry. In: SIMIONATO, ANA V.C. (Coord.) IBEROAMERICAN CONFERENCE ON MASS SPECTROMETRY, 3rd, December 10-15, 2022, Rio de Janeiro, RJ. Abstract... Campinas, SP: Sociedade Brasileira de Espectrometria de Massas - BrMASS, 2022. p. 380-381.

    Abstract: Introduction: Naturally occurring lithium consists of two stable isotopes, 6Li (7.591%) and 7Li (92.409%) and have applications in nuclear technology, pharmaceutical, automotive and geological research. Enriched 7Li isotope in LiOH form has been used as a pH regulator for Pressurized Water Reactor (PWR) reducing corrosion in the primary water circuit [1-3]. The determination of lithium isotopic composition was analyzed by Inductively Coupled Plasma Mass Spectrometry after ion exchange processes, which has been considered a promising technique for the separation of Li isotopes. One of the concerns in ICP-MS analysis is sodium interference. The presence of sodium in the lithium-containing sample has potential implications for the accuracy of isotopic ratio measurements. For this reason, a method is described for the study of sodium interference in 7Li 295,88%₀ and 303,30%₀ enriched solutions. Methods: For this study, the reference standard L-SVEC was used, it has an isotopic abundance of 92.409% for 7Li and 7.591% for 6Li (6Li/7Li ratio = 0.08251) and solutions enriched at 295,88%₀ (6Li/7Li ratio = 0.06661) and 303,30%₀ (6Li/7Li ratio = 0.06810) of 7Li. Concentrations of 50 μg L-1 of lithium were maintained for the solutions used and it was evaluated with the addition of 50, 100, 300, 450 and 1000 μg L-1 of sodium on the enriched samples suffered significant changes in their isotopic ratio. The ICP-MS used for the sample analysis was a PerkinElmer SCIEX Elan 6000. For the isotopic ratio measurement the parameters used was nebulizer gas flow of approximately 0.94 L min-1 , Radio Frequency (RF) 600 W, gas flow rate 1.2 L min-1 , Peak Hopping mode, dwell time 80 and 480 ms for 6Li and 7Li respectively, 50 sweeps per reading, 1 read per replicate and 10 replicates. Results: For this study, 24 samples were analyzed being divided into four sets of samples with 6 samples each set. The sets were composed of samples without addition of sodium and samples with addition of 50, 100, 300, 450 and 1000 μg L-1 of sodium. The first set of samples, composed of the 295,88%₀ enriched sample, had a standard deviation of 3.59✕10-4. The second set of samples, composed of the 303,30%₀ enriched sample, had a standard deviation of 2.63✕10-4. The third and fourth set of samples, composed of aliquots of the L-SVEC standard, obtained a standard deviation of 2.22✕10-4 e 2.54✕10-4, respectively. Showing that the addition of sodium did not significantly interfere in the ratio of lithium isotopes 6 and 7 according to standard deviation. Conclusions: Through the results obtained from the experiment, it was observed that the variation in the ratio between isotopes 6 and 7 of lithium was not significant for the results of analysis in ICP-MS. However, it should be noted that for the purposes of lithium isotope separation processes using ion exchange resins, the interference of sodium in the chromatographic separation needs to be evaluated.

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  • IPEN-DOC 29412

    COTINHO, S.P. ; CORREA, O.V. ; PILLIS, M.F. . Síntese e caracterização de filmes nanoestruturados de ZnO para aplicação em fotocatálise. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... 2022.

    Abstract: Os recursos naturais de águas têm sido contaminados por efluentes provenientes tanto do setor industrial quanto do setor doméstico. E ainda, grande parcela da água tratada é consumida em processos químicos em vários setores industriais, dentre estes os têxteis, de papel e de couro. Aproximadamente 70% dos corantes utilizados em larga escala nos vários processos correspondem a azo-corantes, sendo os principais o alaranjado de metila e o amaranto. Uma alternativa para a remoção de poluentes orgânicos se dá pela degradação fotocatalítica que tem se mostrado um método verde eficiente para eliminação de corantes orgânicos em águas residuais. Entre os semicondutores mais empregados, os óxidos TiO2, WO3 e ZnO têm se destacado. Algumas das características do ZnO que têm tornado esse material atrativo na área de fotocatálise são: boa estabilidade física e química, alta capacidade oxidativa, energia de band gap na região do UV ou do visível do espectro eletromagnético da luz, baixo custo e baixa toxicidade. Este trabalho de pesquisa objetivou a síntese e a caracterização de filmes nanoestruturados de óxido de zinco para obtenção de um fotocatalisador ativado por luz ultravioleta, capaz de degradar compostos orgânicos. Os filmes foram obtidos pelo método sol-gel dissolvendo-se 3,10g de acetato de zinco, 15ml álcool etílico e em seguida adicionando-se 0,86g de monoetanolamina (MEA). A solução obtida apresentou caráter básico (pH 8) e foi depositada por spray a frio em substratos de vidro borossilicato previamente preparados. As amostras foram tratadas termicamente nas temperaturas de 350°C, 400°C e 450°C nos tempos de 30, 40 e 60 minutos. A eficiência dos filmes foi determinada pela degradação do corante alaranjado de metila sob luz ultravioleta. A temperatura e o tempo de tratamento térmico influenciaram a atividade fotocatalítica, visto que a degradação do corante ocorre nas condições a partir de 400°C, sendo que após tratamento térmico a 450°C por 45 minutos foi observado o melhor desempenho.

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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.

✔ É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do Buscar no Repositório , isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.

✔ A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em Navegar

✔ Os filtros disponíveis em Navegar tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro, Autores IPEN apresenta uma relação com os autores vinculados ao IPEN; o ID Autor IPEN diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome; Tipo de acesso diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.

A opção Busca avançada utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.

Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

✔ Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, bibl@ipen.br .

✔ Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.

✔ O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.

✔ Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.

✔ Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).

ATENÇÃO!

ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.

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.