Abstract: In this article the results of the investigation are reported where batteries were made from the negative electrodes of the alloy La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3,8, without annealing, adding 0, 1, 2, 5, 10% , both for carbon nanotube (CNT) and for reduced graphene oxide (rGO) where the discharge capacity obtained during the electrochemical characterization showed that in the addition of 1% rGO the discharge capacity was 332 mAh and 1% CNT 364 mAh , being that the rGO batteries maintaining better cyclic stability during the electrochemical test. The addition materials CNT and rGO were characterized by high resolution MEV-FEV - Field emission gun.

SOARES, E.P.; CASINI, J.S.; FARIA, R.N.; SILVA FILHO, J.C.; TAKIISHI, H. The influence of the addition of rGO and CNT on the electrochemical properties of the batteries the LaNi-Based Battery Alloys. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 4062-4062. Disponível em: http://repositorio.ipen.br/handle/123456789/29539. Acesso em: $DATA.

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Abstract: Recent studies demonstrated the development of papain and bovine serum albumin nanoparticles using gamma radiation (10 kGy) in presence of 20-30% (v/v) ethanol. With the purpose of producing stable and well defined nanocarriers, this work aims to determine the influence of different dose rates over protein nanoparticle formation. For this purpose, papain and BSA nanoparticles were synthetized in phosphate buffer (50 mM, pH 7.2) and ethanol (20-30%, v/v) using a radiation dose of 10 kGy and dose rate of 0.8, 2, 5 and 10 kGy.h-1. After irradiation, samples were evaluated by dynamic light scattering, fluorescence and proteolytic activity to verify the size, secondary structure and monitoring of the enzymatic activity, respectively. For papain nanoparticles it was observed that the dose rate did not influence the particle size formation, however crosslinking evidenced by bityrosine showed that samples irradiated at 0.8 and 5 kGy.h-1 presented higher bityrosine levels. On the other hand, BSA nanoparticles presented different results if compared to papain NPs. Different dose rates caused different and non-linear size increase for each condition, following the order: 5 > 10 > 0.8 > 2 kGy.h-1. However, in terms of crosslinking formation, a linear increase was registered, as at 0.8 kGy.h-1 the smallest signal was achieved, whereas at 10 kGy.h- 1 the highest signal was recorded. In conclusion, BSA nanoparticles were more sensitive to different radiation dose rates than nanopapain. Optimized results in terms of size increase and higher bityrosine levels were observed for the samples irradiated at 5 kGy.h-1, in which nanoparticle formation will occur faster if compared to the synthesis carried out under distinct conditions. As final applications of the system concert their use for the delivery of chemo or radiotherapeutics, the loading of paclitaxel, a well-known chemotherapeutic agent, and radiolabeling with tecntetium- 99m, a radioisotope suitable for biomedical applications, have also been performed with high efficiency, thus demonstrating a proof of concept of such systems.

Palavras-Chave: albumins; blood serum; cattle; cross-linking; dose rates; drug delivery; fluorescence; light scattering; nanoparticles; papain; particle size; proteins; radiation doses; radiation effects

VARCA, G.H.C.; FAZOLIN, G.N.; FERREIRA, A.H.; OLIVEIRA, J.P.R. de; MARQUES, F.; LUGAO, A.B. The effect of radiation dose rate over the formation of protein-based nanoparticles for nanosized delivery of chemo and radiotherapeutics. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 8875-8875. Disponível em: http://repositorio.ipen.br/handle/123456789/29677. Acesso em: $DATA.

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Abstract: In this investigation, the intergranular corrosion (IGC) resistance of the AA2198-T8 alloy welded by friction stir welding (FSW) was investigated by ASTM G110-97 test. The different zones resulting from FSW showed distinct resistances to intergranular attack depending on the heating and/or mechanical effects produced by welding. The base metal (BM) was the most susceptible to IGC whereas the thermomechanically affected zone (TMAZ) and the stir zone (SZ), presented the highest resistances to IGC comparatively to the other zones. The results of IGC tests were correlated with those of thermal simulation, microhardness measurements, transmission electron microscopy (TEM) and optical microscopy (OM). The dissimilarities in corrosion resistance of the various zones were associated to differences in hardening phase quantities between the various zones. In the BM and HAZ, T1 phase, the main hardening phase, was found at grain boundaries and it resulted in IGC susceptibility. The slight IGC observed in the SZ and TMAZ was not associated with T1 phase which was rarely found but to another precipitate (T2 phase) which was found preferentially located at the grain boundaries in these zones.

Palavras-Chave: microstructure; intergranular corrosion; aluminium alloys; friction welding; coatings; welding; transmission electron microscopy

MACHADO, C.S.C.; DONATUS, U.; ARAUJO, J.V.S.; KLUMPP, R.E.; MILAGRE, M.X.; GIORJAO, R.A.R.; MOGILI, N.V.V.; COSTA, I. The effect of FSW on microstructure and intergranular corrosion of the AA2198- T8 alloy. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 5162-5162. Disponível em: http://repositorio.ipen.br/handle/123456789/29571. Acesso em: $DATA.

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Abstract: This research studies the innovation trends of metallic materials related to dental implants using analysis of patent data. Methodology:The database was built through the Derwent Innovation database, between 2007 and 2018. Initially the target patent group was defined using the Keywords dental implant and subsequently a filter with the keyword metal was applied, generating a database with 2796 patents. Patent map analysis enables the detection of technological trends in metal materials over time, identifying the assigned applicants and the countries where patents have been applied. This data exposes the emerging technologies in the area of ??metallic materials for dental implants and enables researchers and companies to observe in a new light their application for health implants.

PESQUEIRA, E.I.O.; POLITANO, R.; ROSSI, J.L.; PORTO, G.S. Technological trends of metallic materials for dental implants detected through patent analysis. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 3976-3976. Disponível em: http://repositorio.ipen.br/handle/123456789/29537. Acesso em: $DATA.

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Abstract: The production of nanoparticles by exsolution is a technique that has been extensively researched and improved recently. Exsolved particles have superior properties when compared to deposited particles. The method of exsolution consists in the reduction of previously solubilized ions in a matrix, giving rise to particles strongly attached to the substrate. Materials with compositions (La1-xSrx)z(Cr1-yNiy)O3-? (x and y = 0%, 5%, 10%, 15% and 20%, z = 100% and 80%) were synthesized using the polymerization of complexes technique. The resin produced in the synthesis process was analyzed using thermal analysis and the calcination temperature was determined to be 900 ° C. The X-ray diffraction technique was used to characterize structures and identify the present phases. All samples were reduced to create nanoparticles of metallic nickel by exsolution. Magnetic analysis was conducted to determine the magnetic behavior of the produced materials. Non-stoichiometric materials were synthesized to verify the influence of different stoichiometry in the exsolution process. Non-stoichiometric A site impaired the solubilization of Ni and Sr in the lanthanum chromite structure. All samples with dopants showed a decrease in the temperature of Neel of the lanthanum chromite. However, the reduction treatment caused an increase in the Neel temperature when compared to the oxidized samples. This is indicative of the decrease in nickel concentration in solid solution, a result consistent with the exsolution mechanism. Using the measurements of magnetism, it was possible to verify the mechanism of exsolution and mass fraction of metallic nickel for each sample. Using electron microscopy techniques, it was possible to detect the presence of nanoparticles after the reduction treatment with a diameter of approximately 20 nm. When performing a local chemical analysis using a transmission electron microscope, it was possible to verify that the particles in question are of metallic nickel.

Palavras-Chave: nanoparticles; resins; ceramics; x-ray diffraction; magnetism; matrix materials; magnetic materials; nickel

FLORIO, D.Z. de; TINTI, V.B.; FONSECA, F.C. Synthesis and magnetic characterization of ni nanoparticles in ceramic matrix. In: INTERNATIONAL CONGRESS ON CERAMICS, 7th; CONGRESSO BRASILEIRO DE CERÂMICA, 62., June 17-21, 2018, Foz do Iguaçu, PR. Abstract... 2018. p. 512-512. Disponível em: http://repositorio.ipen.br/handle/123456789/29691. Acesso em: $DATA.

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Abstract: Hydroxyapatite(HAP) a crystal-chemical analog of the bone tissue mineral component has been intensively studied in recent years as a potential bone substitute in orthopedic and dentistry because of its biocompatibility, biodegradability, bioactivity, and osteoconductive properties. Hydroxyapatite in a nanocrystalline state with uniform size and morphology has many applications in different fields of medicine ranging from targeted drug delivery to designed load-bearing implants. This work presents the synthesis and characterization of nanocrystalline hydroxyapatite derived from hen’s eggshell waste for biomedical applications. Firstly, bio-hydroxyapatite was synthesized by the wet precipitation method in which white hen’s eggshell waste was used. The white hen`s eggshells were washed, dried and reduced to powder with particle size ≤ 30 μm. Then, the eggshell powder was subjected to a heating cycle at 800 ° C for 3 hours to obtain calcium oxide. Calcium oxide was converted to bio-hydroxyapatite by the addition of a solution of distilled water and phosphoric acid under magnetic stirring at 100 ° C, until a viscous slurry was formed, which was oven dried at 110 ° C for 24 hours. The dried material was disintegrated and calcined at 900 ° C for 2 hours to obtain the hydroxyapatite phase. The bio-hydroxyapatite was irradiated with a high intensity ultrasonic (20 kHz, and 450W/cm2) in order to obtain nanocrystalline hydroxyapatite. These synthesized nanocrystalline hydroxyapatites have been characterized by XRD, FE-SEM, FTIR, and TG analyzes.

MOURA, ESPERIDIANA; LODIS, ALINE; REIS, PEDRO; WELLEN, RENATE. Synthesis and characterization of nanocrystalline hydroxyapatite derived from eggshell for biomedical applications. In: AMERICAN CHEMICAL SOCIETY. DIVISION OF CELLULOSE & RENEWABLE MATERIALS. NATIONAL MEETING & EXPOSITION, 255th, March 18-22, 2018, New Orleans, LA. Abstract... 2018. Disponível em: http://repositorio.ipen.br/handle/123456789/29357. Acesso em: $DATA.

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Abstract: One of the graphene based compounds that has giving attention is graphene oxide (GO). This nanomaterial has oxygenated groups on its surface, which provide hydrophilicity and allow its exfoliation in several polar solvents. Moreover, these reactive sites can be further functionalized, yielding nanocomposites with many applications in electrochemistry and biomaterials fields. The objective of this study is to synthesize nickel / graphene oxide (GO-Ni) nanocomposite using electron beam in water /alcohol solution without stabilizers and to characterize GO and GO-Ni by Nanoparticle Tracking Analysis (NTA). The Nanoparticle Tracking Analysis utilizes the properties of both light scattering and Brownian motion in order to obtain the particle size distribution and to measure the diffusion coefficient. From the Stokes-Einstein equation it was possible to obtain the hydrodynamic diameter of the nanomaterials. The NTA result showed that GO and GO-Ni showed respectively 47 nm and 55nm. Both showed a low polydispersity index, indicating the homogeneity of the size distribution and the formation of a monodisperse system. The results showed that it is possible to obtain nanoparticles of graphene oxide incorporated with nickels smaller than 60 nm and with good distribution without the use of stabilizers.

JACOVONE, R.M.S.; SOARES, J.J.S.; SAKATA, S.K. Synthesis and characterization of graphene oxide/nickel nanoparticles using nanoparticle tracking analysis. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 4682-4682. Disponível em: http://repositorio.ipen.br/handle/123456789/29554. Acesso em: $DATA.

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Abstract: Ethanol steam reforming (ESR) is considered asa promising alternative for hydrogen production due to some differentadvantages that include the large availability, relatively low cost, andsuperior reactivity of ethanol as compared to other compounds. Thus, thistechnology is also considered more sustainable and greener as compared to othermethods usually employed for hydrogen production. However, the currentindustrial catalysts suffer from strong deactivation because the extensivecarbon deposition, which limits their performances and utilization. In order toovercome this limitation, we report herein the synthesis of a catalyst based onnickel, cerium and lanthanum supported on activated biocarbon by a microwaveassisted hydrothermal method. In this method, we first performed a hydrothermalactivation of the biocarbon support at 120 °C using nitric acid (0.3 M) in areactor coupled to a microwave source aiming the formation of acid groups atthe surface of our carbonaceous matrix. In a next step, the adsorption of La3+,Ce3+, and Ni3+ onto the activated biocarbon was performed by the addition ofLa(NO3)3.6H2O, Ce(NO3)3.6H2O, and Ni(NO3)3.6H2O in the suspension containingthe activated biocarbon and potassium thiosulfate for stabilization (pH 8.0) at75 °C. The obtained catalyst was then characterized by scanning electronmicroscopy, X-ray dispersive spectroscopy, X-ray diffraction, temperatureprogramed reduction, and surface area by the BET method. After this step, the catalystwas then evaluated towards the ESR, in which 100 % of ethanol conversion wasobserved with the formation of only H2 (~ 60%) and CO2 (ESR products) and COand CH4 as byproducts (both in low concentrations), indicating a goodselectivity for ESR. Good stability was also achieved with no significant lossof activity even after 24 hours of reaction at 550 °C. The reactants and thereaction products were analyzed by gas chromatograph (Agilent 7890A), equippedwith a thermal conductivity detector (TCD) and a flame ionization detector(FID) connected in series.

FERREIRA, J.C.; CAVALLARI, R.V.; SILVA, F.A. e; RODRIGUES, T.S.; BERGAMASCHI, V.S. Synthesis and characterization of catalysts based on nickel, cerium, and lanthanum supported on biocarbon for ethanol steam reforming. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 6970-6970. Disponível em: http://repositorio.ipen.br/handle/123456789/29619. Acesso em: $DATA.

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Abstract: The global legislators have passed more severe vehicle emissions and safety regulations through 2020. In order to solve this equation, the advanced high strength steels (AHSS) grades are qualified to meet the functional performance demands of certain parts. For structural elements, AHSS steels are excellent in the crash zones of the vehicle for their high energy absorption. For structural elements of the passenger compartment, extremely high-strength steels the boron-based Press Hardened Steels (PHS) become one of the most popular materials to improved safety performance. The AHSS permit design body structures with a thinner material in specific areas to achieve the project requirements, due to the high strength and combined with inner reinforcement, too. Recently, the engineers decided to produce parts and reinforcement at the same time during forming called “patchweld” and the PHS steel was specified for the purpose. However, the blanks have to keep together during the hot stamping process and Resistance spot welding (RSW) as a most common welding process for joining sheet steels in the car-body production was the obvious chose. The designed microstructure of the AHSS can be destroyed with the welding thermal cycle, which can affect failure behavior and mechanical properties of the welded structure. It has been recognized that the RSW parameters selection played an important role in the AHSS welding performance. This paper aims to understand the tempering process performed during the RSW cycle with two different welding parameters, known as P4 and P5. The P4 and P5 welding parameters were defined to reach the maximum load during the shear test while full bottom detachment according to AWS D8.9.The test samples were assembled with a gap to reproduce real vehicle welding conditions. The parameter P4 weld PHS sheet samples without heat treatment and without the use of tempering during the passage of current, whereas the parameter P5, weld equal samples, but with tempering during the resistance welding process. The influence of these parameters on the PHS “patchweld” mechanical properties was evaluated with Vickers hardness test (HV) through the cross-section of the specimen with standard metallographic technique preparation and shear tests. The results confirmed the difference at the Heat affected zone (HAZ) mechanical strength over fusion zone (ZF). For the two welding parameters, it was possible to visualize a softening region in the HAZ of the welding parameter P4. The welding parameter P5 with a tempering pattern at the weld obtained superior results in the Heat affected zone due to the reduction of the cooling speed caused by a process performed during the RSW cycle.

MARCELO, L.A.; LARA, J.A.C.; ROSSI, J.L.; COLOSIO, M.A.; OLIVEIRA, B.G.; MUCSI, C.S. Study of patchweld blank Resistance Spot Welding (RSW) before hot stamping with and without heat treatment parameters. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... 2018. p. 4805-4805. Disponível em: http://repositorio.ipen.br/handle/123456789/29555. Acesso em: $DATA.

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