Impact of nanofibrillation degree of eucalyptus and Amazonian hardwood sawdust on physical properties of cellulose nanofibril films

Scatolino, Mário Vanoli; Bufalino, Lina; Mendes, Lourival Marin; Júnior, Mário Guimarães; Tonoli, Gustavo Henrique Denzin

doi:10.1007/s00226-017-0927-4

Cited by 42 publications

(23 citation statements)

References 64 publications

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“…The chemical composition of the freijó wood was in accordance with tropical hardwoods (Gérard et al 2019;Qiu et al 2019). Similar content levels were observed in 25-30-year old freijó wood from natural forests, except for higher levels of holocellulose (78%) and extractives (7%) (Scatolino et al 2017). Environmental factors such as climate, soil and water availability, along with management practices and age, strongly influence the chemical composition of wood.…”

Section: Chemical Compositionsupporting

confidence: 66%

“…The accentuated taper observed in the trunks supports this assessment. However, DBH from 30 to 60 cm were reported for freijó in natural forests (Lima et al 2013;Moulin et al 2016;Scatolino et al 2017), which indicates that the trees in our experiment had not yet attained their maximum growth, needing more time to reach rotation age.…”

Section: Dendrometric Characterizationmentioning

confidence: 54%

“…Furthermore, freijó is easy to manage for commercial wood production (Santos et al 2017). Its wood has natural durability, good acceptance in local and international markets, has suitable properties for use in the manufacture of engineered panels and musical instruments, and is a potential source of cellulose nanofibers and bioactive compounds (Lima et al 2013;Matias et al 2015;Moulin et al 2016;Scatolino et al 2017;Barros and Politano 2019).…”

Section: Introductionmentioning

confidence: 99%

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Physico-mechanical properties of the wood of freijó, Cordia goeldiana (Boraginacea), produced in a multi-stratified agroforestry system in the southwestern Amazon

et al. 2021

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Agroforestry systems (AFSs) integrate, through sustainable practices, agricultural and forest crops for the production of wood and food, providing environmental services, and conserving biodiversity. The freijó (Cordia goeldiana) has potential for cultivation in the Amazon for timber purposes, but data on the characteristics of its wood produced in AFSs are scarce. Our objective was to determine the physical-mechanical properties and suggest technological applications of freijó wood produced in a multi-stratified AFS established in the state of Rondônia, Brazil in 1996. Agricultural and forest species were established in the AFS in double rows with 5.0-m x 2.5-m spacing. Three 19-year-old freijó trees were harvested for chemical, physical (density and dimensional stability), and mechanical (compression, static bending, Janka hardness, and shear strength) characterization of the wood. The wood presented a chemical composition similar to tropical hardwoods, was moderately heavy (582.63 kg m-3), and had high dimensional stability in comparison with other consecrated woods on the market (longitudinal, radial, and tangential retraction = 0.25, 4.27, and 6.83%, respectively). The values determined for parallel (32.32 MPa) and perpendicular compression (8.02 MPa), specific strength (55.32 MPa kg-1 m-3), parallel (2373.33 N) and perpendicular Janka hardness (2326.67 N), strength to static bending (63.5 MPa), and shear (5.94 MPa) were similar to the values observed in other high-density tropical woods grown in either monoculture plantations or natural forests. The wood under study is suitable for manufacture of high-value-added products, such as fine furniture, residential floors, musical instruments and structural pieces.

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Section: Chemical Compositionsupporting

confidence: 66%

Section: Dendrometric Characterizationmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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Physico-mechanical properties of the wood of freijó, Cordia goeldiana (Boraginacea), produced in a multi-stratified agroforestry system in the southwestern Amazon

et al. 2021

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“…The acid hydrolysis is selective on degradation of amorphous holocellulose, resulting in colloid suspensions of welldefined cellulose nanocrystals (ALEMDAR; SAIN, 2008). Cellulose nanofibers have been studied for a myriad of applications, such as biofilms (GUIMARÃES JR. et al, 2015;BUFALINO et al, 2015a;BUFALINO et al, 2015b;SCATOLINO et al, 2017a;SCATOLINO et al, 2017b), reinforced papers (LAVOINE et al, 2014;MIRMEHDI et al, 2017), nano-metal complexes (DONIA et al, 2012;GUPTA et al, 2013;ARANTES et al, 2017), hybrid materials (FORTUNATI et al, 2014;RAABE et al, 2014;RAABE et al, 2015), biomedical products (SVENSSON et al, 2005;NIKOLAJASKI et al, 2012) and fiber-cements (FONSECA et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Strength Improvement of Hydroxypropyl Methylcellulose/ Starch Films Using Cellulose Nanocrystals

Prado

Raabe

Mirmehdi

et al. 2017

CERNE

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Interest in cellulose nanocrystals obtained from natural resources has grown mainly because of features that such materials provide when inserted into polymeric matrices. The present study aimed to evaluate the effect of cellulose nanocrystals addition on mechanical properties of biofilms made from hypromellose (or hydroxypropyl methylcellulose - HPMC) and cassava starch blends (CS). The cellulose nanocrystals were produced by acid hydrolysis and characterized by optical microscopy (OM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetry (TG). Films were made with pure CS, pure hypromellose and also with blends of CS and hypromellose by casting. Then cellulose nanocrystals were added to the blends in the concentrations of 1, 3 and 10% (m/m). Evaluations of the films included tensile performance and fracture surface by scanning electron microscopy (SEM). It was observed that the reinforcement with nanocrystals improved the mechanical properties of the films, and their fracture surface showed that cellulose nanocrystals promoted an improvement in the cohesion of the hypromellose and starch molecules in the blend, and created a more homogeneous surface.

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“…In the attempt to provide the consumer a product free of contamination by pathogenic microorganisms, researches have been done in the development of films for packaging which could have an antimicrobial potential. Among the different types of material used for films production, the literature reports the following as the most common: cassava starch [1], fish gelatin [2], whey protein isolate [3] and the cellulose nanofibrils (CNFs) [4][5][6]. Currently, there is a great interest in materials obtained directly from natural resources, as cellulose derivatives, due to its biodegradable characteristics [7].…”

Section: Introductionmentioning

confidence: 99%

Tannin-stabilized silver nanoparticles and citric acid added associated to cellulose nanofibrils: effect on film antimicrobial properties

et al. 2019

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The aim of this work was to evaluate the potential of cellulose nanofibrils (CNFs) films treated with commercial solution of Ag nanoparticles stabilized with natural tannin and silane groups in the bacteria growth inhibition. The films were produced with commercial pulps of pine and eucalyptus treated with sodium hydroxide (5% w/v) and calcium hydroxide (10% w/v), respectively. The bacteria selected for the inhibition test were the gram-positive Listeria monocytogenes and gram-negative Salmonella enteriditis. The films performance was investigated by the antimicrobial activity using disc diffusion. In addition, the pulps were evaluated by their chemical composition, water retention index (WRI) and X-ray diffraction (XRD). The content of hemicelluloses in the treated pine pulp (11.32%) was lower in comparison to the found in the treated eucalyptus pulp (14.46%). The XRD diffractogram presented higher crystallinity index for the treated eucalyptus pulp (70%) with a characteristic peak of calcium carbonate. The treated eucalyptus pulp showed higher WRI and viscosity values in relation to the treated pine pulp. Growth inhibitory halos were more expressive when the treatment with both antimicrobial solutions were proceeded in the films produced with pine CNFs with addition of the citric acid. The effect of the nanoparticles stabilized with tannin must be highlighted, mainly on the bacterium S. enteriditis.

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Impact of nanofibrillation degree of eucalyptus and Amazonian hardwood sawdust on physical properties of cellulose nanofibril films

Cited by 42 publications

References 64 publications

Physico-mechanical properties of the wood of freijó, Cordia goeldiana (Boraginacea), produced in a multi-stratified agroforestry system in the southwestern Amazon

Physico-mechanical properties of the wood of freijó, Cordia goeldiana (Boraginacea), produced in a multi-stratified agroforestry system in the southwestern Amazon

Strength Improvement of Hydroxypropyl Methylcellulose/ Starch Films Using Cellulose Nanocrystals

Tannin-stabilized silver nanoparticles and citric acid added associated to cellulose nanofibrils: effect on film antimicrobial properties

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