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Dr. Walter Boschetti
Federal University of Viçosa

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0 Cellulose
0 Wood
0 lignin
0 Wood Technology
0 pulp and paper

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lignin
Cellulose

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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: 24 May 2021 in Sustainability
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This study aimed to assess the effect of mechanical pretreatment on bleached eucalyptus kraft pulp fibers and investigate the influence of reaction time and temperature on the properties and yield of nanocrystalline cellulose (NCC) and microcrystalline cellulose (MCC). Two types of pulps were hydrolyzed, pulp 1 (control, whole fibers) and pulp 2 (mechanically pretreated, disintegrated fibers). NCC and MCC particles were obtained by sulfuric acid hydrolysis (60% w/w) of eucalyptus pulps under different conditions of time (30–120 min) and temperature (45–55 °C). Physical treatment of kraft pulp facilitated acid hydrolysis, resulting in higher NCC yields compared with no pretreatment. The morphologic properties and crystallinity index (CI) of NCC and MCC were little affected by pulp pretreatment. NCC particles obtained from pulps 1 and 2 were needle-shaped, with mean diameters of 6 and 4 nm, mean lengths of 154 and 130 nm, and CI of 74.6 and 76.8%, respectively. MCC particles obtained from pulps 1 and 2 were rod-shaped, with mean diameters of 2.4 and 1.4 µm, mean lengths of 37 and 22 µm, and CI of 73.1 and 74.5%, respectively. Pulps 1 and 2 and their respective NCC and MCC derivatives had a cellulose I crystalline structure.

ACS Style

Walter Boschetti; Ana Carvalho; Angélica Carneiro; Graziela Vidaurre; Fernando Gomes; Déborah Soratto. Effect of Mechanical Treatment of Eucalyptus Pulp on the Production of Nanocrystalline and Microcrystalline Cellulose. Sustainability 2021, 13, 5888 .

AMA Style

Walter Boschetti, Ana Carvalho, Angélica Carneiro, Graziela Vidaurre, Fernando Gomes, Déborah Soratto. Effect of Mechanical Treatment of Eucalyptus Pulp on the Production of Nanocrystalline and Microcrystalline Cellulose. Sustainability. 2021; 13 (11):5888.

Chicago/Turabian Style

Walter Boschetti; Ana Carvalho; Angélica Carneiro; Graziela Vidaurre; Fernando Gomes; Déborah Soratto. 2021. "Effect of Mechanical Treatment of Eucalyptus Pulp on the Production of Nanocrystalline and Microcrystalline Cellulose." Sustainability 13, no. 11: 5888.

Journal article
Published: 28 November 2020 in Polymers
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The application of cellulose nanocrystal has lately been investigated as polymer composites reinforcement owing to favorable characteristics of biodegradability and cost effectiveness as well as superior mechanical properties. In the present work novel nanocomposites of unsaturated polyester matrix reinforced with low amount of 1, 2, and 3 wt% of cellulose nanocrystals obtained from conifer fiber (CNC) were characterized. The polyester matrix and nanocomposites were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), bending test, and thermogravimetric analysis (TGA). The result showed that the addition of only 2 wt% CNC increased the nanocomposite flexural strength by 159%, the ductility by 500% and the toughness by 1420%. Fracture analyses by SEM revealed a uniform participation of the CNC in the polyester microstructure. The resistance to thermal degradation of the CNC reinforced nanocomposites was improved in more than 20 °C as compared to neat polyester. No significant changes were detected in the water absorptions and XRD pattern of the neat polyester with incorporations up to 3 wt% CNC. These results reveal that the 2 wt% CNC nanocomposite might be a promising more ductile, lightweight and cost-effective substitute for conventional glass fiber composites in engineering applications.

ACS Style

Grazielle Da Silva Maradini; Michel Picanço Oliveira; Gabriel Madeira Da Silva Guanaes; Gabriel Zuqui Passamani; Lilian Gasparelli Carreira; Walter Torezani Neto Boschetti; Sergio Neves Monteiro; Artur Camposo Pereira; Bárbara Ferreira De Oliveira. Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals. Polymers 2020, 12, 2838 .

AMA Style

Grazielle Da Silva Maradini, Michel Picanço Oliveira, Gabriel Madeira Da Silva Guanaes, Gabriel Zuqui Passamani, Lilian Gasparelli Carreira, Walter Torezani Neto Boschetti, Sergio Neves Monteiro, Artur Camposo Pereira, Bárbara Ferreira De Oliveira. Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals. Polymers. 2020; 12 (12):2838.

Chicago/Turabian Style

Grazielle Da Silva Maradini; Michel Picanço Oliveira; Gabriel Madeira Da Silva Guanaes; Gabriel Zuqui Passamani; Lilian Gasparelli Carreira; Walter Torezani Neto Boschetti; Sergio Neves Monteiro; Artur Camposo Pereira; Bárbara Ferreira De Oliveira. 2020. "Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals." Polymers 12, no. 12: 2838.

Journal article
Published: 01 February 2019 in Nordic Pulp & Paper Research Journal
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Lignin, a renewable product with high potential for various applications, can be recovered from kraft black liquor by precipitation in acid medium. The objective of this study was to evaluate the effect of the addition of kraft lignin to wood biomass on the properties of briquettes. Hymenolobium petraeum, Eucalyptus, and Pinus biomasses received the addition of 0, 3, 6, 9, and 12 % (w/w) of kraft lignin, and briquettes were manufactured. Wood biomasses and briquettes were characterized chemically and physically. Addition of kraft lignin positively influenced the apparent density, energy density, and mechanical resistance of briquettes. Furthermore, kraft lignin increased the calorific value of briquettes. Addition of 6 % (w/w) of kraft lignin was sufficient to improve the quality properties of briquettes, which demonstrates the great potential of kraft lignin as an additive in briquette production.

ACS Style

Walter Torezani Neto Boschetti; Ana Márcia Macedo Ladeira Carvalho; Angélica De Cássia Oliveira Carneiro; Larissa Carvalho Santos; Lucas De Barros Quaresma Poyares. Potential of kraft lignin as an additive in briquette production. Nordic Pulp & Paper Research Journal 2019, 34, 147 -152.

AMA Style

Walter Torezani Neto Boschetti, Ana Márcia Macedo Ladeira Carvalho, Angélica De Cássia Oliveira Carneiro, Larissa Carvalho Santos, Lucas De Barros Quaresma Poyares. Potential of kraft lignin as an additive in briquette production. Nordic Pulp & Paper Research Journal. 2019; 34 (1):147-152.

Chicago/Turabian Style

Walter Torezani Neto Boschetti; Ana Márcia Macedo Ladeira Carvalho; Angélica De Cássia Oliveira Carneiro; Larissa Carvalho Santos; Lucas De Barros Quaresma Poyares. 2019. "Potential of kraft lignin as an additive in briquette production." Nordic Pulp & Paper Research Journal 34, no. 1: 147-152.

Article
Published: 01 January 2019 in Revista Árvore
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The objective of this study was to evaluate the properties of briquettes produced with different proportions of pine and eucalyptus wood, as well as to characterize the potential of kraft lignin as an additive in the composition of briquettes for energy generation. The treatments differed from one another in the pine and eucalyptus wood particle ratios (0, 25, 50, 75 and 100%), as well as for the kraft lignin content (0, 2, 4, 6, 8, 10, and 12%). The biomasses were characterized by their physical and chemical properties, and briquette properties were evaluated according to apparent density, lower calorific value (LCV), energy density, and maximum burst load. The results showed an increase in the apparent density as the proportion of lignin and eucalyptus in the briquettes increased. The particle composition of the briquettes had a higher influence on the energy density increase compared to the addition of kraft lignin, being more significant in briquettes produced with higher proportions of eucalyptus. It was also observed that the addition of lignin increased the resistance to the rupture load, and that there was a specific value at which this resistance was higher (at 7% or 11% of lignin, depending on the proportion of particles). Additionally, the briquettes made with 100% pine achieved greater mechanical resistance. In general, kraft lignin presented good potential for use as a briquette additive, contributing to improved energy and mechanical properties.

ACS Style

Walter Torezani Neto Boschetti; Alice Do Carmo Precci Lopes; Robisnéia Adriana Ribeiro; Rafael Quezada Reyes; Angélica De Cássia Oliveira Carneiro. KRAFT LIGNIN AS AN ADDITIVE IN PINE AND EUCALYPTUS PARTICLE COMPOSITION FOR BRIQUETTE PRODUCTION. Revista Árvore 2019, 43, 1 .

AMA Style

Walter Torezani Neto Boschetti, Alice Do Carmo Precci Lopes, Robisnéia Adriana Ribeiro, Rafael Quezada Reyes, Angélica De Cássia Oliveira Carneiro. KRAFT LIGNIN AS AN ADDITIVE IN PINE AND EUCALYPTUS PARTICLE COMPOSITION FOR BRIQUETTE PRODUCTION. Revista Árvore. 2019; 43 (2):1.

Chicago/Turabian Style

Walter Torezani Neto Boschetti; Alice Do Carmo Precci Lopes; Robisnéia Adriana Ribeiro; Rafael Quezada Reyes; Angélica De Cássia Oliveira Carneiro. 2019. "KRAFT LIGNIN AS AN ADDITIVE IN PINE AND EUCALYPTUS PARTICLE COMPOSITION FOR BRIQUETTE PRODUCTION." Revista Árvore 43, no. 2: 1.

Journal article
Published: 17 July 2018 in Nordic Pulp & Paper Research Journal
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Neutral sulphite semichemical pulping (NSSC) of Schizolobium amazonicum (Paricá), a fast-growing Amazonian tree, was compared with that of Eucalyptus grandis (eucalypt), one of the most important wood sources for the Brazilian pulp industry, and with mixtures of both woods in different proportions (mix). Wood chips prepared from 7-year old trees were steamed, cooked using the NSSC process and defibered in a 12” disc refiner in three stages. The paricá wood produced pulp of lower yield (75 %) than eucalypt (77 %) at 16 % sulfite/150 min/170 °C. The paricá and eucalypt pulps were bleached to about 68 and 74 % ISO brightness, respectively, by the QPFAS sequence. Paricá consumed more energy for refining in comparison with the eucalypt wood. The wood mix produced lower yield and brightness than the single species processed separately.

ACS Style

Graziela Baptista Vidaurre; Miguel Pereira; Walter Torezani Neto Boschetti; Rudolf Patt; Jorge Luiz Colodette; Benedito Rocha Vital; Maria Naruna Felix de Almeida. NSSC pulping of fast growing trees. Nordic Pulp & Paper Research Journal 2018, 33, 404 -413.

AMA Style

Graziela Baptista Vidaurre, Miguel Pereira, Walter Torezani Neto Boschetti, Rudolf Patt, Jorge Luiz Colodette, Benedito Rocha Vital, Maria Naruna Felix de Almeida. NSSC pulping of fast growing trees. Nordic Pulp & Paper Research Journal. 2018; 33 (3):404-413.

Chicago/Turabian Style

Graziela Baptista Vidaurre; Miguel Pereira; Walter Torezani Neto Boschetti; Rudolf Patt; Jorge Luiz Colodette; Benedito Rocha Vital; Maria Naruna Felix de Almeida. 2018. "NSSC pulping of fast growing trees." Nordic Pulp & Paper Research Journal 33, no. 3: 404-413.

Articles
Published: 30 November 2017 in Revista Árvore
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Inclined trees produce reaction wood, whose properties are distinct from normal wood. This situation can affect the production of charcoal. This study was conducted to evaluate the quality of charcoal derived from reaction wood in trees of a commercial plantation inclined due to the action of wind. We used six year old wood from a Eucalyptus grandis xEucalyptus urophylla hybrid from plantations located in Minas Gerais. The physical and chemical properties of the wood were determined as well as the gravimetric yield and charcoal properties. According to the results, there were significant differences between the properties of the reaction and normal wood, with the reaction wood having lower levels of lignin and extractives, greater holocellulose content and low specific gravity. However, these characteristics of reaction wood did not significantly affect the properties of its charcoal.

ACS Style

Walter Torezani Neto Boschetti; Matheus Perdigão De Castro Freitas Pereira; Deborah Nava Soratto; Ana Carolina Boa; Angélica De Cássia Oliveira Carneiro; Graziela Baptista Vidaurre; Ana Márcia Macedo Ladeira Carvalho. PROPERTIES OF CHARCOAL PRODUCED FROM REACTION WOOD IN TREES INCLINED DUE TO WIND1. Revista Árvore 2017, 41, 1 .

AMA Style

Walter Torezani Neto Boschetti, Matheus Perdigão De Castro Freitas Pereira, Deborah Nava Soratto, Ana Carolina Boa, Angélica De Cássia Oliveira Carneiro, Graziela Baptista Vidaurre, Ana Márcia Macedo Ladeira Carvalho. PROPERTIES OF CHARCOAL PRODUCED FROM REACTION WOOD IN TREES INCLINED DUE TO WIND1. Revista Árvore. 2017; 41 (6):1.

Chicago/Turabian Style

Walter Torezani Neto Boschetti; Matheus Perdigão De Castro Freitas Pereira; Deborah Nava Soratto; Ana Carolina Boa; Angélica De Cássia Oliveira Carneiro; Graziela Baptista Vidaurre; Ana Márcia Macedo Ladeira Carvalho. 2017. "PROPERTIES OF CHARCOAL PRODUCED FROM REACTION WOOD IN TREES INCLINED DUE TO WIND1." Revista Árvore 41, no. 6: 1.

Articles
Published: 01 September 2017 in CERNE
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This study aims to evaluate the quality of normal, tension and opposite wood of eucalyptus trees lengthwise, in straight and inclined stems, affected by wind action. It also aims to explain the pulping parameters resultant from the quality of the wood. The trees were grouped into four tilt ranges, ranging from 0 to 50º, and the basic density, chemical composition of the wood, and performance in kraft pulping were assessed. Normal and tension wood had similar basic densities; while for opposite wood, the density was lower, being responsible for a decrease in reaction wood density. The chemical composition of the wood was influenced by the presence of reaction wood in the stem. Tension and opposite wood showed lower levels of extractives and lignin and higher holocellulose content when compared to normal wood, with favorable wood quality for pulping. The increase in holocellulose content and the reduction of lignin and extractives content contributed positively to a more delignified pulp and reduction of the Kappa number. However, after cooking the reaction wood under the same conditions as those of normal wood, reaction wood pulping tends to have a lower screen yields. Due to differences in basic density and chemical constituents between opposite and normal wood, it is recommended not to designate the opposite wood as normal wood.

ACS Style

Walter Torezani Neto Boschetti; Juarez Paes; Graziela Baptista Vidaurre; Marina Donária Chaves Arantes; João Gabriel Missia Da Silva. QUALITY OF REACTION WOOD IN Eucalyptus TREES TILTED BY WIND FOR PULP PRODUCTION. CERNE 2017, 23, 291 -297.

AMA Style

Walter Torezani Neto Boschetti, Juarez Paes, Graziela Baptista Vidaurre, Marina Donária Chaves Arantes, João Gabriel Missia Da Silva. QUALITY OF REACTION WOOD IN Eucalyptus TREES TILTED BY WIND FOR PULP PRODUCTION. CERNE. 2017; 23 (3):291-297.

Chicago/Turabian Style

Walter Torezani Neto Boschetti; Juarez Paes; Graziela Baptista Vidaurre; Marina Donária Chaves Arantes; João Gabriel Missia Da Silva. 2017. "QUALITY OF REACTION WOOD IN Eucalyptus TREES TILTED BY WIND FOR PULP PRODUCTION." CERNE 23, no. 3: 291-297.

Journal article
Published: 04 May 2017 in Revista de Geografia - PPGEO - UFJF
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Este estudo elege a fazenda Fortaleza, Alegre, ES, da primeira metade do século XIX, como exemplar piloto para elaboração de reflexões pautadas na utilização de ferramentas da geotecnologia para acervo de bens culturais do ambiente rural. Para isso realizou análises morfométricas do meio ambiente rural e utilização do Analytic Hierarchy Process - AHP, para obtenção da Sensibilidade Cultural para o Ambiente Rural - SCAR. Definiu como área elegível, da fazenda Fortaleza, aquela obtida a partir da delimitação por 500m em linha reta a partir da relação dos quatro extremos do telhado da casa sede. Com auxílio de estudos históricos das fazendas do século XIX, e percepção da fazenda em sua essência conforme preceitos da fenomenologia e uso da terra relacionou Fatores de Fragilidade Morfológica e Cultural – FFMC, para obtenção da SCAR. Destaca o uso de geotecnologias como ferramentas auxiliares à preservação do patrimônio cultural rural.

ACS Style

Ana Aparecida Barbosa Pereira; Alexandre Rosa Dos Santos; Walter Torezani Neto Boschetti; Maria Angela De Castro E Silva Bortolucci. GEOTECNOLOGIA APLICADA A PRESERVAÇÃO DO PATRIMÔNIO RURAL. Revista de Geografia - PPGEO - UFJF 2017, 7, 1 .

AMA Style

Ana Aparecida Barbosa Pereira, Alexandre Rosa Dos Santos, Walter Torezani Neto Boschetti, Maria Angela De Castro E Silva Bortolucci. GEOTECNOLOGIA APLICADA A PRESERVAÇÃO DO PATRIMÔNIO RURAL. Revista de Geografia - PPGEO - UFJF. 2017; 7 (1):1.

Chicago/Turabian Style

Ana Aparecida Barbosa Pereira; Alexandre Rosa Dos Santos; Walter Torezani Neto Boschetti; Maria Angela De Castro E Silva Bortolucci. 2017. "GEOTECNOLOGIA APLICADA A PRESERVAÇÃO DO PATRIMÔNIO RURAL." Revista de Geografia - PPGEO - UFJF 7, no. 1: 1.

Articles
Published: 01 August 2016 in Revista Árvore
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The research object was evaluating the quality of preserving treatment of Eucalyptus sp. fence posts by the sap substitution method and comparing the penetration through the traditional and photocolorimetry segmentation methods. The fence posts, 2,0 meters long and with a diameter between 8 and 12 cm, were exposed to 2, 3 and 4% concentrations of CCB based-product active ingredients for 10 days. The penetrations were analyzed using two methodologies, one by the Image Pro Plus 4.5 software, using photocolorimetry segmentation method performance, and by analyzing the product retention in four positions of the treated fence posts. The treatment submitted pieces attained low penetration and, thus, the retention values were less than the required for direct contact with the ground. On the other hand, the proposed photocolorimetry segmentation methodology was efficient and could be an alternative to determine a more precise and fast penetration.

ACS Style

Walter Torezani Neto Boschetti; Diego Mariano Vieira; Jordão Cabral Moulin; Dercílio Junior Verly Lopes; Juarez Paes; Ana Márcia Macedo Ladeira Carvalho. PRESERVATIVE TREATMENT OF FENCE POSTS EVALUATION THROUGH PHOTOCOLORIMETRY SEGMENTATION PERFORMANCE. Revista Árvore 2016, 40, 731 -739.

AMA Style

Walter Torezani Neto Boschetti, Diego Mariano Vieira, Jordão Cabral Moulin, Dercílio Junior Verly Lopes, Juarez Paes, Ana Márcia Macedo Ladeira Carvalho. PRESERVATIVE TREATMENT OF FENCE POSTS EVALUATION THROUGH PHOTOCOLORIMETRY SEGMENTATION PERFORMANCE. Revista Árvore. 2016; 40 (4):731-739.

Chicago/Turabian Style

Walter Torezani Neto Boschetti; Diego Mariano Vieira; Jordão Cabral Moulin; Dercílio Junior Verly Lopes; Juarez Paes; Ana Márcia Macedo Ladeira Carvalho. 2016. "PRESERVATIVE TREATMENT OF FENCE POSTS EVALUATION THROUGH PHOTOCOLORIMETRY SEGMENTATION PERFORMANCE." Revista Árvore 40, no. 4: 731-739.