Assessing cellulose nanofiber production from olive tree pruning residue

Fillat, Úrsula; Wicklein, Bernd; Martín‐Sampedro, Raquel; Ibarra, David; Ruiz‐Hitzky, Eduardo; Valencia, C.; Sarrión, Andrés; Castro, Eulógio; Eugenio, María E.

doi:10.1016/j.carbpol.2017.09.072

Cited by 86 publications

(83 citation statements)

References 73 publications

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“…27 The cellulose nanofibres used in this work displayed a crystallinity index of 61% and a crystallite size of 1.9 nm typical of CNF from eucalyptus. 28 Interestingly, the distance between the glucopyranose planes in cellulose I β is 3.8 Å (0.5 a of the cellulose I β unit cell), 29 which is close to the interlayer distance of graphite (i.e. 3.35 Å).…”

Section: Resultsmentioning

confidence: 92%

In situ generation of 3D graphene-like networks from cellulose nanofibres in sintered ceramics

et al. 2018

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Establishing a 3D electrically percolating network in an insulating matrix is key to numerous engineering and functional applications. To this end, using hydrophobic carbon nanofillers is tempting, but still results in suboptimal performance due to processing challenges. Here, we demonstrate how natural cellulose nanofibres can be in situ transformed into graphene-like sheets connected to a 3D network enhancing both the transport and the mechanical properties of sintered engineering ceramics. The network architecture also permits the decoupling of electrical and thermal conductivities, which represents a major obstacle in attaining efficient thermoelectric materials. We foresee that our transferable methodology can pave the way for the use of natural nanofibres to unravel the full potential of 3D graphene-like networks to accelerate development in fields like energy and telecommunications.

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Section: Resultsmentioning

confidence: 92%

In situ generation of 3D graphene-like networks from cellulose nanofibres in sintered ceramics

et al. 2018

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“…If these COONa groups were converted into free carboxylic groups (COOH), this peak would shift to 1736 cm −1 . The band at 1410 cm −1 also indicated the presence of COONa, since it is associated to the C–O symmetric stretching of dissociated carboxyl groups [ 31 ], although this band has been also assigned to a slight transformation of cellulose I to cellulose II (from 1427 to 1410 cm −1 ) because of the alkaline conditions employed in TEMPO-ox pretreatment [ 28 , 32 ]. Finally, no differences were found between FTIR spectra of CNF-UnBl-Elm and CNF-Bl-Elm because the amount of lignin in unbleached samples was low and, therefore, low intensity lignin peaks would be hidden by the pronounced cellulose bands.…”

Section: Resultsmentioning

confidence: 99%

Cellulose Nanofibers from a Dutch Elm Disease-Resistant Ulmus minor Clone

et al. 2020

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The potential use of elm wood in lignocellulosic industries has been hindered by the Dutch elm disease (DED) pandemics, which have ravaged European and North American elm groves in the last century. However, the selection of DED-resistant cultivars paves the way for their use as feedstock in lignocellulosic biorefineries. Here, the production of cellulose nanofibers from the resistant Ulmus minor clone Ademuz was evaluated for the first time. Both mechanical (PFI refining) and chemical (TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation) pretreatments were assessed prior to microfluidization, observing not only easier fibrillation but also better optical and barrier properties for elm nanopapers compared to eucalyptus ones (used as reference). Furthermore, mechanically pretreated samples showed higher strength for elm nanopapers. Although lower nanofibrillation yields were obtained by mechanical pretreatment, nanofibers showed higher thermal, mechanical and barrier properties, compared to TEMPO-oxidized nanofibers. Furthermore, lignin-containing elm nanofibers presented the most promising characteristics, with slightly lower transparencies.

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“…The preparation of CNFs used in this work was carried out through the TEMPO-mediated oxidation of eucalyptus pulp following the procedure described by Fillat et al 62 The resulting cellulose nanofibers were stored at 4°C.…”

Section: Methodsmentioning

confidence: 99%