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Mrs. Andressa Souza
Military Institute of Engineering

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0 Natural Fiber Reinforcement
0 Natural fibers
0 Ballistic performance
0 ballistic protection
0 Natural fiber composites

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Review
Published: 31 July 2021 in Materials
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This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

ACS Style

Markssuel Marvila; Afonso de Azevedo; Paulo de Matos; Sergio Monteiro; Carlos Vieira. Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials. Materials 2021, 14, 4304 .

AMA Style

Markssuel Marvila, Afonso de Azevedo, Paulo de Matos, Sergio Monteiro, Carlos Vieira. Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials. Materials. 2021; 14 (15):4304.

Chicago/Turabian Style

Markssuel Marvila; Afonso de Azevedo; Paulo de Matos; Sergio Monteiro; Carlos Vieira. 2021. "Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials." Materials 14, no. 15: 4304.

Review
Published: 28 July 2021 in Polymers
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Geopolymer materials have been gaining ground in the civil construction sector not only for having superior physical properties when compared to conventional cement, but also for being less harmful to the environment, since the synthesis of the geopolymer does not release toxic gases or require high energy costs. On the other hand, geopolymer materials like cementitious matrices have low flexural strength and have fragile breakage. To overcome these deficiencies, the insertion of fibers in geopolymeric matrices has been evaluated as a solution. Although most research on this practice focuses on the use of synthetic fibers, the use of natural fibers has been growing and brings as an advantage the possibility of producing an even more ecological material, satisfying the need to create eco-friendly materials that exists today in society. Thus, this paper aimed to, through the evaluation of research available in the literature, understand the behavior of fibers in geopolymer matrices, identify similarities and differences between the performance of geopolymer composites reinforced with natural and synthetic fibers and, understanding that it is possible, point out ways to optimize the performance of these composites.

ACS Style

Afonso de Azevedo; Ariana Cruz; Markssuel Marvila; Leandro de Oliveira; Sergio Monteiro; Carlos Vieira; Roman Fediuk; Roman Timokhin; Nikolai Vatin; Marina Daironas. Natural Fibers as an Alternative to Synthetic Fibers in Reinforcement of Geopolymer Matrices: A Comparative Review. Polymers 2021, 13, 2493 .

AMA Style

Afonso de Azevedo, Ariana Cruz, Markssuel Marvila, Leandro de Oliveira, Sergio Monteiro, Carlos Vieira, Roman Fediuk, Roman Timokhin, Nikolai Vatin, Marina Daironas. Natural Fibers as an Alternative to Synthetic Fibers in Reinforcement of Geopolymer Matrices: A Comparative Review. Polymers. 2021; 13 (15):2493.

Chicago/Turabian Style

Afonso de Azevedo; Ariana Cruz; Markssuel Marvila; Leandro de Oliveira; Sergio Monteiro; Carlos Vieira; Roman Fediuk; Roman Timokhin; Nikolai Vatin; Marina Daironas. 2021. "Natural Fibers as an Alternative to Synthetic Fibers in Reinforcement of Geopolymer Matrices: A Comparative Review." Polymers 13, no. 15: 2493.

Journal article
Published: 05 June 2021 in Polymers
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In a recent paper, novel polyester nanocomposites reinforced with up to 3 wt% of cellulose nanocrystals (CNCs) extracted from conifer fiber were characterized for their crystallinity index, water absorption, and flexural and thermal resistance. The use of this novel class of nanocomposites as a possible substitute for conventional glass fiber composites (fiberglass) was then suggested, especially for the 1 and 2 wt% CNC composites due to promising bending, density, and water absorption results. However, for effective engineering applications requiring impact and tensile performance, the corresponding properties need to be evaluated. Therefore, this extension of the previous work presents additional results on Izod and tensile tests of 1 and 2 wt% CNC-reinforced polyester composites, together with a comparative cost analysis with fiberglass. The chemical effect caused by incorporation of CNCs into polyester was also investigated by FTIR. In comparison to the neat polyester, the Izod impact energy increased 50% and 16% for the 1 and 2 wt% composites, respectively. On the other hand, the tensile strength and Young’s modulus remained constant within the ANOVA statistical analysis. FTIR analysis failed to reveal any chemical modification caused by up to 2 wt% CNC incorporation. The present impact and tensile results corroborate the promising substitution of a polyester composite reinforced with very low amount of CNCs for common fiberglass in engineering application.

ACS Style

Grazielle Maradini; Michel Oliveira; Lilian Carreira; Damaris Guimarães; Demetrius Profeti; Ananias Dias Júnior; Walter Boschetti; Bárbara Oliveira; Artur Pereira; Sergio Monteiro. Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension. Polymers 2021, 13, 1878 .

AMA Style

Grazielle Maradini, Michel Oliveira, Lilian Carreira, Damaris Guimarães, Demetrius Profeti, Ananias Dias Júnior, Walter Boschetti, Bárbara Oliveira, Artur Pereira, Sergio Monteiro. Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension. Polymers. 2021; 13 (11):1878.

Chicago/Turabian Style

Grazielle Maradini; Michel Oliveira; Lilian Carreira; Damaris Guimarães; Demetrius Profeti; Ananias Dias Júnior; Walter Boschetti; Bárbara Oliveira; Artur Pereira; Sergio Monteiro. 2021. "Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension." Polymers 13, no. 11: 1878.

Journal article
Published: 20 April 2021 in Materials
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The fresh and rheological properties of alkali mortars activated by blast furnace slag (BFS) were investigated. Consistency tests, squeeze flow, dropping ball, mass density in the hardened state, incorporated air, and water retention were performed. Mortars were produced with the ratio 1:2:0.45 (binder:sand:water), using not only ordinary Portland cement for control but also BFS, varying the sodium content of the activated alkali mortars from 2.5 to 15%. The results obtained permitted understanding that mortars containing 2.5 to 7.5% sodium present a rheological behavior similar to cementitious mortars by the Bingham model. In turn, the activated alkali mortars containing 10 to 15% sodium showed a very significant change in the properties of dynamic viscosity, which is associated with a change in the type of model, starting to behave similar to the Herschel–Bulkley model. Evaluating the properties of incorporated air and water retention, it appears that mortars containing 12.5% and 15% sodium do not have compatible properties, which is related to the occupation of sodium ions in the interstices of the material. Thus, it is concluded that the techniques used were consistent in the rheological characterization of activated alkali mortars.

ACS Style

Markssuel Marvila; Afonso Azevedo; Paulo Matos; Sérgio Monteiro; Carlos Vieira. Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag. Materials 2021, 14, 2069 .

AMA Style

Markssuel Marvila, Afonso Azevedo, Paulo Matos, Sérgio Monteiro, Carlos Vieira. Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag. Materials. 2021; 14 (8):2069.

Chicago/Turabian Style

Markssuel Marvila; Afonso Azevedo; Paulo Matos; Sérgio Monteiro; Carlos Vieira. 2021. "Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag." Materials 14, no. 8: 2069.

Journal article
Published: 02 October 2020 in Journal of Materials Research and Technology
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In the present work, two types of composites were produced, both reinforced with 30 vol% of curaua fibers (CF). In the first type, only the fiber was functionalized with graphene oxide (GO), producing the GOCF/EM composite. While in the second, only the epoxy matrix (EM) was functionalized, producing the CF/GOEM composite. The objective of the work was to investigate the influence of functionalization with GO on the tensile properties of these produced composites. In comparison with the non GO-functionalized composite, as control CF/EM, the results revealed an increase in yield strength (64%), tensile strength (40%), Young's modulus (60%) and toughness (28%) of the CF/GOEM composite. The GOCF/EM composites for which the fibers were functionalized with GO also performed better than the CF/EM composite. The ANOVA and Tukey tests confirm this increase. As for ductility, within the standard deviation, no change was observed between samples functionalized by GO and those from the control. For the first time, comparing the results of the composites, it was demonstrated that a polymer matrix functionalized by GO offers superior tensile performance compared to the other types, keeping the same GO concentration in the composite. This fact is corroborated by the analysis of the corresponding fracture mechanisms. Preliminary results of composite with simultaneous functionalization of both fiber and epoxy matrix failed to present superior properties. This might be attributed to high amount of GO, which is apparently not a good reinforcement as the curaua fiber.

ACS Style

Ulisses Oliveira Costa; Lucio Fabio Cassiano Nascimento; Julianna Magalhães Garcia; Wendell Bruno Almeida Bezerra; Garcia Filho Fabio da Costa; Fernanda Santos da Luz; Wagner Anacleto Pinheiro; Sergio Neves Monteiro. Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement. Journal of Materials Research and Technology 2020, 9, 13390 -13401.

AMA Style

Ulisses Oliveira Costa, Lucio Fabio Cassiano Nascimento, Julianna Magalhães Garcia, Wendell Bruno Almeida Bezerra, Garcia Filho Fabio da Costa, Fernanda Santos da Luz, Wagner Anacleto Pinheiro, Sergio Neves Monteiro. Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement. Journal of Materials Research and Technology. 2020; 9 (6):13390-13401.

Chicago/Turabian Style

Ulisses Oliveira Costa; Lucio Fabio Cassiano Nascimento; Julianna Magalhães Garcia; Wendell Bruno Almeida Bezerra; Garcia Filho Fabio da Costa; Fernanda Santos da Luz; Wagner Anacleto Pinheiro; Sergio Neves Monteiro. 2020. "Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement." Journal of Materials Research and Technology 9, no. 6: 13390-13401.

Journal article
Published: 01 October 2020 in Polymers
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The replacement of synthetic fibers by natural fibers has, in recent decades, been the subject of intense research, particularly as reinforcement of composites. In this work, the lesser known tucum fiber, extracted from the leaves of the Amazon Astrocaryum vulgare palm tree, is investigated as a possible novel reinforcement of epoxy composites. The tucum fiber was characterized by pullout test for interfacial adhesion with epoxy matrix. The fiber presented a critical length of 6.30 mm, with interfacial shear strength of 2.73 MPa. Composites prepared with different volume fractions of 20 and 40% tucum fiber were characterized by tensile and Izod impact tests, as well as by ballistic impact energy absorption using .22 ammunition. A cost analysis compared the tucum fiber epoxy composites with other natural and synthetic fiber reinforced epoxy composites. The results showed that 40 vol% tucum fiber epoxy composites increased the tensile strength by 104% and the absorbed Izod impact energy by 157% in comparison to the plain epoxy, while the ballistic performance of the 20 vol% tucum fiber composites increased 150%. These results confirmed for the first time a reinforcement effect of the tucum fiber to polymer composites. Moreover, these composites exhibit superior cost effectiveness, taking into account a comparison made with others epoxy polymer composites.

ACS Style

Michelle Souza Oliveira; Fernanda Santos Da Luz; Andressa Teixeira Souza; Luana Cristyne Da Cruz Demosthenes; Artur Camposo Pereira; Fabio Da Costa Garcia Filho; Fábio De Oliveira Braga; André Ben-Hur Da Silva Figueiredo; Sergio Neves Monteiro. Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites. Polymers 2020, 12, 2259 .

AMA Style

Michelle Souza Oliveira, Fernanda Santos Da Luz, Andressa Teixeira Souza, Luana Cristyne Da Cruz Demosthenes, Artur Camposo Pereira, Fabio Da Costa Garcia Filho, Fábio De Oliveira Braga, André Ben-Hur Da Silva Figueiredo, Sergio Neves Monteiro. Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites. Polymers. 2020; 12 (10):2259.

Chicago/Turabian Style

Michelle Souza Oliveira; Fernanda Santos Da Luz; Andressa Teixeira Souza; Luana Cristyne Da Cruz Demosthenes; Artur Camposo Pereira; Fabio Da Costa Garcia Filho; Fábio De Oliveira Braga; André Ben-Hur Da Silva Figueiredo; Sergio Neves Monteiro. 2020. "Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites." Polymers 12, no. 10: 2259.

Journal article
Published: 14 September 2020 in Polymers
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A basic characterization of novel epoxy matrix composites incorporated with up to 40 vol% of processed leaf fibers from the Copernicia prunifera palm tree, known as carnauba fibers, was performed. The tensile properties for the composite reinforced with 40 vol% of carnauba fibers showed an increase (40%) in the tensile strength and (69%) for the elastic modulus. All composites presented superior elongation values in comparison to neat epoxy. Izod impact tests complemented by fibers/matrix interfacial strength evaluation by pullout test and Fourier transformed infrared (FTIR) analysis revealed for the first time a significant reinforcement effect (> 9 times) caused by the carnauba fiber to polymer matrix. Additional thermogravimetric analysis (TG/DTG) showed the onset of thermal degradation for the composites (326 ~ 306 °C), which represents a better thermal stability than the plain carnauba fiber (267 °C) but slightly lower than that of the neat epoxy (342 °C). Differential scanning calorimetry (DSC) disclosed an endothermic peak at 63 °C for the neat epoxy associated with the glass transition temperature (Tg). DSC endothermic peaks for the composites, between 73 to 103 °C, and for the plain carnauba fibers, 107 °C, are attributed to moisture release. Dynamic mechanical analysis confirms Tg of 64 °C for the neat epoxy and slightly higher composite values (82–84 °C) due to the carnauba fiber interference with the epoxy macromolecular chain mobility. Both by its higher impact resistance and thermal behavior, the novel carnauba fibers epoxy composites might be considered a viable substitute for commonly used glass fiber composites.

ACS Style

Raí Felipe Pereira Junio; Lucio Fabio Cassiano Nascimento; Lucas De Mendonça Neuba; Andressa Teixeira Souza; João Victor Barbosa Moura; Fábio Da Costa Garcia Filho; Sergio Neves Monteiro. Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites. Polymers 2020, 12, 2090 .

AMA Style

Raí Felipe Pereira Junio, Lucio Fabio Cassiano Nascimento, Lucas De Mendonça Neuba, Andressa Teixeira Souza, João Victor Barbosa Moura, Fábio Da Costa Garcia Filho, Sergio Neves Monteiro. Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites. Polymers. 2020; 12 (9):2090.

Chicago/Turabian Style

Raí Felipe Pereira Junio; Lucio Fabio Cassiano Nascimento; Lucas De Mendonça Neuba; Andressa Teixeira Souza; João Victor Barbosa Moura; Fábio Da Costa Garcia Filho; Sergio Neves Monteiro. 2020. "Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites." Polymers 12, no. 9: 2090.

Journal article
Published: 08 September 2020 in Polymers
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A growing environmental concern is increasing the search for new sustainable materials. In this scenario, natural lignocellulosic fibers (NLFs) became an important alternative to replace synthetic fibers commonly used as composites reinforcement. In this regard, unknown NLFs such as the caranan fiber (Mauritiella armata) found in South American rain forests revealed promising properties for engineering applications. Thus, for the first time, the present work conducted a technical characterization of caranan fiber-incorporated composites. Epoxy matrix composites with 10, 20 and 30 vol% of continuous and aligned caranan fibers were investigated by tensile tests, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Composites with more than 10% vol of caranan fibers significantly increase the elastic modulus and toughness in comparison to the neat epoxy. Indeed, the composite with 30 vol% was 50% stiffer, 130% tougher, and 100% stronger, which characterized an effective reinforcement. As for the elastic modulus, total strain and tensile toughness, there is a clear tendency of improvement with the amount of caranan fiber. The TGA disclosed the highest onset temperature of degradation (298 °C) with the least mass loss (36.8%) for the 30 vol% caranan fiber composite. It also displayed a higher degradation peak at 334 °C among the studied composites. The lowest glass transition temperature of 63 °C was obtained by DSC, while the highest of 113 °C by dynamic mechanical analysis (DMA) for the 30 vol% caranan composite. These basic technical findings emphasize the caranan fiber potential as reinforcement for polymer composites.

ACS Style

Andressa Teixeira Souza; Raí Felipe Pereira Junio; Lucas De Mendonça Neuba; Verônica Scarpini Candido; Alisson Clay Rios Da Silva; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro; Lucio Fabio Cassiano Nascimento. Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites. Polymers 2020, 12, 2037 .

AMA Style

Andressa Teixeira Souza, Raí Felipe Pereira Junio, Lucas De Mendonça Neuba, Verônica Scarpini Candido, Alisson Clay Rios Da Silva, Afonso Rangel Garcez De Azevedo, Sergio Neves Monteiro, Lucio Fabio Cassiano Nascimento. Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites. Polymers. 2020; 12 (9):2037.

Chicago/Turabian Style

Andressa Teixeira Souza; Raí Felipe Pereira Junio; Lucas De Mendonça Neuba; Verônica Scarpini Candido; Alisson Clay Rios Da Silva; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro; Lucio Fabio Cassiano Nascimento. 2020. "Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites." Polymers 12, no. 9: 2037.

Journal article
Published: 08 August 2020 in Polymers
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Composites reinforced with natural lignocellulosic fibers (NLFs) are gaining relevance as the worldwide demand for renewable and sustainable materials increases. To develop novel natural composites with satisfactory properties, less common NLFs should also be investigated. Among these, the Cyperus malaccensis (CM), a type of sedge fiber, is already used in simple items like ropes, furniture, and paper, but has not yet been investigated as composite reinforcement for possible engineering applications. Therefore, the present work evaluated for the first time the properties of novel epoxy composites incorporated with 10, 20, and 30 vol.% of CM sedge fibers. Tensile, Izod-impact, and ballistic impact tests were performed, as well as Fourier transform infrared (FT-IR) spectroscopy and thermal analysis of the composites. Results disclosed a decrease (−55%) in tensile strengths as compared to the neat epoxy. However, the elastic modulus of the 30 vol.% sedge fiber composite increased (+127%). The total strain and absorbed ballistic energy did not show significant variation. The Izod impact energy of the 30 vol.% composite was found to be 181% higher than the values obtained for the neat epoxy as a control sample. An increase in both stiffness and toughness characterized a reinforcement effect of the sedge fiber. The thermal analysis revealed a slight decrease (−15%) in the degradation temperature of the CM sedge fiber composites compared to the neat epoxy. The glass-transition temperatures were determined to be in the range of 67 to 81 °C.

ACS Style

Lucas De Mendonça Neuba; Raí Felipe Pereira Junio; Matheus Pereira Ribeiro; Andressa Teixeira Souza; Eduardo De Sousa Lima; Fábio Da Costa Garcia Filho; André Ben-Hur Da Silva Figueiredo; Fábio De Oliveira Braga; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro. Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber. Polymers 2020, 12, 1776 .

AMA Style

Lucas De Mendonça Neuba, Raí Felipe Pereira Junio, Matheus Pereira Ribeiro, Andressa Teixeira Souza, Eduardo De Sousa Lima, Fábio Da Costa Garcia Filho, André Ben-Hur Da Silva Figueiredo, Fábio De Oliveira Braga, Afonso Rangel Garcez De Azevedo, Sergio Neves Monteiro. Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber. Polymers. 2020; 12 (8):1776.

Chicago/Turabian Style

Lucas De Mendonça Neuba; Raí Felipe Pereira Junio; Matheus Pereira Ribeiro; Andressa Teixeira Souza; Eduardo De Sousa Lima; Fábio Da Costa Garcia Filho; André Ben-Hur Da Silva Figueiredo; Fábio De Oliveira Braga; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro. 2020. "Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber." Polymers 12, no. 8: 1776.

Journal article
Published: 29 July 2020 in Journal of Materials Research and Technology
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The influence of weathering on the ballistic performance of an armor made with aramid fabric was for the first time investigated, by standard exposure related to degradation conditions of: (i) ultraviolet radiation (UV); (ii) moisten by washing (MW) and (iii) UV+MW. Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) characterized the modifications that occurred on the aramid fabric armor (AFA). Samples of both non-exposed (NE) and UV, MW and UV+MW exposed AFA, were subjected to ballistic tests against 0.380-caliber ammunition. The results of UV and UV+MW exposed samples revealed sensible macromolecular alterations, due to the scission of the polymeric chain by the processes of hydrolysis and photolysis, causing oxidation on the surface and breaking of the crystalline domains inside the aramid fiber. There was also a decrease in the crystallinity of the polyaramid macromolecular chain, being more severe after exposure to simple MW. However, no changes were observed in the thermal behavior of the AFA. The ballistic behavior was significantly affected by the weathering simulation conditions. The damage caused in the AFA by the ballistic impact was comparable within all groups exposed to degradation conditions. Practically, the same trauma, 28.2–32.1 mm and the same number, two (2), of perforated layers were observed for all exposed groups. These common ballistic results were less favorable than those of 25.7 mm and one layer, respectively, for the non-exposed AFA. The penetration traumas remained below the standard 44 mm lethal limit.

ACS Style

Rodrigo Fernandes Nascimento; Anderson Oliveira da Silva; Ricardo Pondé Weber; Sergio Neves Monteiro. Influence of UV radiation and moisten associated with natural weathering on the ballistic performance of aramid fabric armor. Journal of Materials Research and Technology 2020, 9, 10334 -10345.

AMA Style

Rodrigo Fernandes Nascimento, Anderson Oliveira da Silva, Ricardo Pondé Weber, Sergio Neves Monteiro. Influence of UV radiation and moisten associated with natural weathering on the ballistic performance of aramid fabric armor. Journal of Materials Research and Technology. 2020; 9 (5):10334-10345.

Chicago/Turabian Style

Rodrigo Fernandes Nascimento; Anderson Oliveira da Silva; Ricardo Pondé Weber; Sergio Neves Monteiro. 2020. "Influence of UV radiation and moisten associated with natural weathering on the ballistic performance of aramid fabric armor." Journal of Materials Research and Technology 9, no. 5: 10334-10345.

Journal article
Published: 09 June 2020 in Polymers
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Natural lignocellulosic fibers and corresponding fabrics have been gaining notoriety in recent decades as reinforcement options for polymer matrices associated with industrially applied composites. These natural fibers and fabrics exhibit competitive properties when compared with some synthetics such as glass fiber. In particular, the use of fabrics made from natural fibers might be considered a more efficient alternative, since they provide multidirectional reinforcement and allow the introduction of a larger volume fraction of fibers in the composite. In this context, it is important to understand the mechanical performance of natural fabric composites as a basic condition to ensure efficient engineering applications. Therefore, it is also important to recognize that ramie fiber exhibiting superior strength can be woven into fabric, but is the least investigated as reinforcement in strong, tough polymers to obtain tougher polymeric composites. Accordingly, this paper presents the preparation of epoxy composite containing 30 vol.% Boehmeria nivea fabric by vacuum-assisted resin infusion molding technique and mechanical behavior characterization of the prepared composite. Obtained results are explained based on the fractography studies of tested samples.

ACS Style

Fabio Da Costa Garcia Filho; Fernanda Santos Da Luz; Lucio Fabio Cassiano Nascimento; Kestur Gundappa Satyanarayana; Jaroslaw Wieslaw Drelich; Sergio Neves Monteiro. Mechanical Properties of Boehmeria nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared by Vacuum-Assisted Resin Infusion Molding. Polymers 2020, 12, 1311 .

AMA Style

Fabio Da Costa Garcia Filho, Fernanda Santos Da Luz, Lucio Fabio Cassiano Nascimento, Kestur Gundappa Satyanarayana, Jaroslaw Wieslaw Drelich, Sergio Neves Monteiro. Mechanical Properties of Boehmeria nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared by Vacuum-Assisted Resin Infusion Molding. Polymers. 2020; 12 (6):1311.

Chicago/Turabian Style

Fabio Da Costa Garcia Filho; Fernanda Santos Da Luz; Lucio Fabio Cassiano Nascimento; Kestur Gundappa Satyanarayana; Jaroslaw Wieslaw Drelich; Sergio Neves Monteiro. 2020. "Mechanical Properties of Boehmeria nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared by Vacuum-Assisted Resin Infusion Molding." Polymers 12, no. 6: 1311.

Journal article
Published: 08 June 2020 in Journal of Materials Research and Technology
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Bone remodeling for spontaneous regeneration might be achieved by a combination of collagen and hydroxyapatite (HA). The aim of the present study is to synthesize and characterize hybrid composites of HA and carbonated hydroxyapatite (CHA) with different types of collagen. For these hybrid composite synthesis, HA or CHA precursors were precipitated in solutions containing either hydrolyzed collagen (HC) or type II collagen (COL). For control, pure HA and CHA were synthesized in the absence of collagen. During the HA-based materials synthesis, in addition to HA, another calcium phosphate phase, brushite, was also produced, as confirmed by X-ray diffraction and scanning electron microscopy (SEM). In the composites, HA presented preferential crystalline growth on the (211) crystallographic plane due to the influence of both collagens. On the other hand, CHA was precipitated in its pure form, although a reduction in the crystallinity was observed with the incorporation of the carbonate groups. Calcium/phosphorous (Ca/P) mass ratios determined by energy dispersive spectroscopy (EDS) were very close to those expected for HA, 1.67, and brushite, 1.00, confirming the formation of two calcium phosphate phases. SEM/EDS results showed higher values of Ca/P for CHA than for HA, which indicates that some phosphate groups were replaced by carbonated ones.

ACS Style

Mônica Rufino Senra; Rafaella Barbosa de Lima; Diego De Holanda Saboya Souza; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. Thermal characterization of hydroxyapatite or carbonated hydroxyapatite hybrid composites with distinguished collagens for bone graft. Journal of Materials Research and Technology 2020, 9, 7190 -7200.

AMA Style

Mônica Rufino Senra, Rafaella Barbosa de Lima, Diego De Holanda Saboya Souza, Maria De Fátima Vieira Marques, Sergio Neves Monteiro. Thermal characterization of hydroxyapatite or carbonated hydroxyapatite hybrid composites with distinguished collagens for bone graft. Journal of Materials Research and Technology. 2020; 9 (4):7190-7200.

Chicago/Turabian Style

Mônica Rufino Senra; Rafaella Barbosa de Lima; Diego De Holanda Saboya Souza; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. 2020. "Thermal characterization of hydroxyapatite or carbonated hydroxyapatite hybrid composites with distinguished collagens for bone graft." Journal of Materials Research and Technology 9, no. 4: 7190-7200.

Journal article
Published: 06 June 2020 in Journal of Materials Research and Technology
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Most by-product wastes of the coffee industry are underutilized, including a fibrous husk that covers the coffee seeds, known as parchment. The present work aims to characterize the parchment fiber and to study the influence of alkaline treatment followed by a steam explosion process assisted by mechanical high shearing to obtain microfibrillated cellulose. The first step of this study was to quantify, using a three-steps methodology, the lignocellulosic constituents present in the parchment. Cellulose, hemicellulose and lignin were identified by Fourier transform infrared spectrophotometry (FTIR) and thermogravimetric analysis (TGA). From these results it was quantified around 22% of cellulose in the parchment. In sequence, alkaline treatment and steam explosion were performed to raise the cellulose content. The novelty of this work was to perform the steam explosion under relatively milder conditions, in order to produce microfibrillated cellulose with a high aspect ratio. It was observed by TGA an improvement in thermal stability and by X-ray diffraction (XRD) an increasing in the crystallinity. Finally, from scanning electron microscopy (SEM) it was verified that cellulose fibrils became more exposed, with diameters reaching micro and nanometric sizes. This ensures a potential for composite reinforcement with microfibrillated cellulose.

ACS Style

Raquel S. Reis; Lucas G.P. Tienne; Diego De H.S. Souza; Maria De Fátima V. Marques; Sergio N. Monteiro. Characterization of coffee parchment and innovative steam explosion treatment to obtain microfibrillated cellulose as potential composite reinforcement. Journal of Materials Research and Technology 2020, 9, 9412 -9421.

AMA Style

Raquel S. Reis, Lucas G.P. Tienne, Diego De H.S. Souza, Maria De Fátima V. Marques, Sergio N. Monteiro. Characterization of coffee parchment and innovative steam explosion treatment to obtain microfibrillated cellulose as potential composite reinforcement. Journal of Materials Research and Technology. 2020; 9 (4):9412-9421.

Chicago/Turabian Style

Raquel S. Reis; Lucas G.P. Tienne; Diego De H.S. Souza; Maria De Fátima V. Marques; Sergio N. Monteiro. 2020. "Characterization of coffee parchment and innovative steam explosion treatment to obtain microfibrillated cellulose as potential composite reinforcement." Journal of Materials Research and Technology 9, no. 4: 9412-9421.

Journal article
Published: 05 June 2020 in Journal of Materials Research and Technology
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An organic photovoltaic cell (OPV) is a subcategory of the third generation of photovoltaic cells. Advantages of OPV include lightness and ease of production in industrial scale. This work proposes the synthesis and characterization of two novel random and block copolymers for OPV containing fluorene (F), thiophene (T) and benzothidiazole (B) as structural units. Polymerizations were performed via the Suzuki-Miyaura mechanism. The yields obtained for both copolymers were around 65% with corresponding molar masses measured by GPC of 3394 and 4598 g/mol. From TGA, the onset degradation temperature was approximately 415 °C, while the maximum degradation temperature was around 440 °C, for both copolymers. FTIR and NMR analyses confirmed the ratio of aliphatic and aromatic carbons in the structure of both copolymers. Difference of chaining between both copolymers was verified by 13CNMR and XRD. The energy values of HOMO were -5.76 eV for random and -5.74 eV for block copolymer. Through UV-Vis spectroscopy, optical bandgaps of 2.39 and 2.34 eV were obtained for random and block polymers, respectively. Finally, LUMO energy levels of -3.37 eV (random) and -3.40 eV (block) were calculated by subtracting the optical band gap from the HOMO energy. Mobility measurements by JV method were performed in pure polymer films, rendering 1.91 × 10−6 and 1.35 × 10-8 cm2 /V.s for random and block copolymers, respectively. Copolymers were applied in conventional and inverted devices, presenting diode behavior. Energy efficiency obtained was higher for the block copolymer, which was consistent with the obtained interplanar distances estimated by XRD.

ACS Style

Lais Schmidt Albuquerque; Jose Jonathan Rubio Arias; Bianca Santos; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. Synthesis and characterization of novel conjugated copolymers for application in third generation photovoltaic solar cells. Journal of Materials Research and Technology 2020, 9, 7975 -7988.

AMA Style

Lais Schmidt Albuquerque, Jose Jonathan Rubio Arias, Bianca Santos, Maria De Fátima Vieira Marques, Sergio Neves Monteiro. Synthesis and characterization of novel conjugated copolymers for application in third generation photovoltaic solar cells. Journal of Materials Research and Technology. 2020; 9 (4):7975-7988.

Chicago/Turabian Style

Lais Schmidt Albuquerque; Jose Jonathan Rubio Arias; Bianca Santos; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. 2020. "Synthesis and characterization of novel conjugated copolymers for application in third generation photovoltaic solar cells." Journal of Materials Research and Technology 9, no. 4: 7975-7988.

Journal article
Published: 22 April 2020 in Journal of Materials Research and Technology
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Natural lignocellulosic fibers have been studied as cost-effective reinforcements in composites for engineering applications that, in some cases, may require exposure to temperatures above ambient. In the present work a promising fiber extracted from a Brazilian palm tree, the piassava fiber both neat as well as graphene oxide (GO) functionalized, had their thermal behavior analyzed jointly with corresponding epoxy composites. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) were for the first time employed to assess the thermal properties of the GO-coated piassava fiber. Dynamic mechanical analysis (DMA) investigated innovative epoxy matrix composites reinforced up to 30 vol% of both neat and GO-coated piassava fiber. TGA/DTG results indicate a limit of thermal stability of about 200 °C for the neat piassava fiber. On the other hand, the hemicellulose and lignin maximum degradation rates occurred at relatively higher temperatures for the GO-coated piassava fibers. The DSC analysis revealed an endothermic peak at about 125 °C for the neat piassava fiber associated with the breakage of molecular bond, which was not found for the GO-coated fibers within the maximum interval of temperature analyzed. The DMA parameters revealed notable changes attributed to the effect of GO coating on the piassava fibers regarding the viscous stiffness and damping capacity of the epoxy composite.

ACS Style

Fabio Da Costa Garcia Filho; Fernanda Santos da Luz; Michelle Souza Oliveira; Artur Camposo Pereira; Ulisses Oliveira Costa; Sergio Neves Monteiro. Thermal behavior of graphene oxide-coated piassava fiber and their epoxy composites. Journal of Materials Research and Technology 2020, 9, 5343 -5351.

AMA Style

Fabio Da Costa Garcia Filho, Fernanda Santos da Luz, Michelle Souza Oliveira, Artur Camposo Pereira, Ulisses Oliveira Costa, Sergio Neves Monteiro. Thermal behavior of graphene oxide-coated piassava fiber and their epoxy composites. Journal of Materials Research and Technology. 2020; 9 (3):5343-5351.

Chicago/Turabian Style

Fabio Da Costa Garcia Filho; Fernanda Santos da Luz; Michelle Souza Oliveira; Artur Camposo Pereira; Ulisses Oliveira Costa; Sergio Neves Monteiro. 2020. "Thermal behavior of graphene oxide-coated piassava fiber and their epoxy composites." Journal of Materials Research and Technology 9, no. 3: 5343-5351.

Review
Published: 20 March 2020 in Materials
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High entropy alloys (HEAs) emerged in the beginning of XXI century as novel materials to “keep-an-eye-on”. In fact, nowadays, 16 years after they were first mentioned, a lot of research has been done regarding the properties, microstructure, and production techniques for the HEAs. Moreover, outstanding properties and possibilities have been reported for such alloys. However, a way of jointing these materials should be considered in order to make such materials suitable for engineering applications. Welding is one of the most common ways of jointing materials for engineering applications. Nevertheless, few studies concerns on efforts of welding HEAs. Therefore, it is mandatory to increase the investigation regarding the weldability of HEAs. This work aims to present a short review about what have been done in recent years, and what are the most common welding techniques that are used for HEAs. It also explores what are the measured properties of welded HEAs as well as what are the main challenges that researchers have been facing. Finally, it gives a future perspective for this research field.

ACS Style

Fabio C. Garcia Filho; Sergio N. Monteiro. Welding Joints in High Entropy Alloys: A Short-Review on Recent Trends. Materials 2020, 13, 1411 .

AMA Style

Fabio C. Garcia Filho, Sergio N. Monteiro. Welding Joints in High Entropy Alloys: A Short-Review on Recent Trends. Materials. 2020; 13 (6):1411.

Chicago/Turabian Style

Fabio C. Garcia Filho; Sergio N. Monteiro. 2020. "Welding Joints in High Entropy Alloys: A Short-Review on Recent Trends." Materials 13, no. 6: 1411.

Journal article
Published: 21 February 2020 in Journal of Materials Research and Technology
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The coffee ripe red bean is a worldwide food commodity consumed mainly as a beverage made from the roasted beans. A secondary product of the coffee industry is the oil extracted from unripe green beans. This extraction generates a solid green coffee cake (GCC) with potential to be applied as polymer composite reinforcement. For this purpose, the GCC must be treated to improve the reinforcing characteristics. The present work investigated initially the treatment of GCC by the steam explosion process and then evaluated the use of treated GCC fibers as reinforcement of composites with polypropylene (PP) matrix. The best GCC/water ratio was first determined in a steam jet reactor in association with thermogravimetric analysis. PP composites incorporated with 2 and 5 wt% by GCC fibers were fabricated by extrusion. Both plain as received and the best steam-blown GCC/PP composites were characterized by differential scanning calorimetry (DSC) and dynamical-mechanical analysis (DMA). The incorporation of treated GCC provided a higher thermostability to the composite, disclosed by DSC, as compared to the plain PP reference sample. It was also revealed that incorporation of treated GCC increased the composite degree of crystallinity. The DMA showed an improvement in the storage modulus in the range of 14–22% and decrease in the glass transition in PP/fiber composites compared to plain PP.

ACS Style

Elisa Barbosa de Brito; Lucas Galhardo Pimenta Tienne; Suellem Barbosa Cordeiro; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. The influence of steam explosion treatment of green coffee cake on the thermal and mechanical properties of reinforced polypropylene matrix composites. Journal of Materials Research and Technology 2020, 9, 4051 -4060.

AMA Style

Elisa Barbosa de Brito, Lucas Galhardo Pimenta Tienne, Suellem Barbosa Cordeiro, Maria De Fátima Vieira Marques, Sergio Neves Monteiro. The influence of steam explosion treatment of green coffee cake on the thermal and mechanical properties of reinforced polypropylene matrix composites. Journal of Materials Research and Technology. 2020; 9 (3):4051-4060.

Chicago/Turabian Style

Elisa Barbosa de Brito; Lucas Galhardo Pimenta Tienne; Suellem Barbosa Cordeiro; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. 2020. "The influence of steam explosion treatment of green coffee cake on the thermal and mechanical properties of reinforced polypropylene matrix composites." Journal of Materials Research and Technology 9, no. 3: 4051-4060.

Journal article
Published: 25 January 2020 in Journal of Materials Research and Technology
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The arapaima is a large Amazonian freshwater fish and an example of a natural protective system against predators such as the piranha fish. In this work, both the plain scales and a 30 vol% of arapaima scales reinforced epoxy composite were characterized for their structure, composition and morphology. The characterization was performed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). The SEM images showed that the surface morphology of the scales was not altered by the flattening process applied before composite manufacturing. The EDS results confirm that the percentage of calcium is higher in the scale outer layer, which also shows the presence of phosphorous. The evidence of collagens in the plain scales as well as the presence of hydroxyl groups and absorption bands related to the epoxy group in the composites were revealed by FTIR. Mechanical bend tests disclosed the toughening contribution of arapaima scales to the composite epoxy matrix. Nanoindentation testing confirms the higher hardness of the scale outer layer associated with calcium participation. These experimental results provide, for the first time, an initial view of the arapaima scales potential for use as reinforcement in novel polymer composites.

ACS Style

Wendell Bruno Almeida Bezerra; Sergio Neves Monteiro; Michelle Souza Oliveira; Fernanda Santos da Luz; Fabio Da Costa Garcia Filho; Luana Cristyne Da Cruz Demosthenes; Ulisses Oliveira Costa. Processing and characterization of Arapaima gigas scales and their reinforced epoxy composites. Journal of Materials Research and Technology 2020, 9, 3005 -3012.

AMA Style

Wendell Bruno Almeida Bezerra, Sergio Neves Monteiro, Michelle Souza Oliveira, Fernanda Santos da Luz, Fabio Da Costa Garcia Filho, Luana Cristyne Da Cruz Demosthenes, Ulisses Oliveira Costa. Processing and characterization of Arapaima gigas scales and their reinforced epoxy composites. Journal of Materials Research and Technology. 2020; 9 (3):3005-3012.

Chicago/Turabian Style

Wendell Bruno Almeida Bezerra; Sergio Neves Monteiro; Michelle Souza Oliveira; Fernanda Santos da Luz; Fabio Da Costa Garcia Filho; Luana Cristyne Da Cruz Demosthenes; Ulisses Oliveira Costa. 2020. "Processing and characterization of Arapaima gigas scales and their reinforced epoxy composites." Journal of Materials Research and Technology 9, no. 3: 3005-3012.

Book chapter
Published: 12 September 2018 in Current Topics in the Utilization of Clay in Industrial and Medical Applications
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ACS Style

Carlos Maurício F. Vieira; Lucas Fonseca Amaral; Sergio N. Monteiro. Recycling of Steelmaking Plant Wastes in Clay Bricks. Current Topics in the Utilization of Clay in Industrial and Medical Applications 2018, 1 .

AMA Style

Carlos Maurício F. Vieira, Lucas Fonseca Amaral, Sergio N. Monteiro. Recycling of Steelmaking Plant Wastes in Clay Bricks. Current Topics in the Utilization of Clay in Industrial and Medical Applications. 2018; ():1.

Chicago/Turabian Style

Carlos Maurício F. Vieira; Lucas Fonseca Amaral; Sergio N. Monteiro. 2018. "Recycling of Steelmaking Plant Wastes in Clay Bricks." Current Topics in the Utilization of Clay in Industrial and Medical Applications , no. : 1.

Articles
Published: 20 August 2018 in Materials Research
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The response to ballistic impact of alumina-ultra high molecular weight polyethylene (UHMWPE) composites with different relative concentrations of alumina was investigated. The impact tests were carried out at subsonic speed using a compressed air system. The results showed that the depth of penetration (DOP) in a Medium Density Fiberboard (MDF) bulkhead protected by a disk of the composite decreased with increasing concentration of alumina in the composite. Scanning electron microscopy (SEM) images of composites with 80 %, 85 % and 95 % alumina showed transgranular, intergranular and ductile fracture mechanisms.

ACS Style

André Ben-Hur Da Silva Figueiredo; Édio Pereira Lima Júnior; Alaelson Vieira Gomes; Gabriel Burlandy Mota De Melo; Sergio Neves Monteiro; Ronaldo Sergio De Biasi. Response to Ballistic Impact of Alumina-UHMWPE Composites. Materials Research 2018, 21, 1 .

AMA Style

André Ben-Hur Da Silva Figueiredo, Édio Pereira Lima Júnior, Alaelson Vieira Gomes, Gabriel Burlandy Mota De Melo, Sergio Neves Monteiro, Ronaldo Sergio De Biasi. Response to Ballistic Impact of Alumina-UHMWPE Composites. Materials Research. 2018; 21 (5):1.

Chicago/Turabian Style

André Ben-Hur Da Silva Figueiredo; Édio Pereira Lima Júnior; Alaelson Vieira Gomes; Gabriel Burlandy Mota De Melo; Sergio Neves Monteiro; Ronaldo Sergio De Biasi. 2018. "Response to Ballistic Impact of Alumina-UHMWPE Composites." Materials Research 21, no. 5: 1.