2018
DOI: 10.1021/acssuschemeng.8b02278
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Analysis of the Porous Architecture and Properties of Anisotropic Nanocellulose Foams: A Novel Approach to Assess the Quality of Cellulose Nanofibrils (CNFs)

Abstract: Cellulose nanofibrils (CNFs) are a unique nanomaterial because of their abundant, renewable, and biocompatible origin. Compared with synthetic nanoparticles, CNFs are commonly produced from cellulose fibers (e.g., wood pulp) by repetitive high-shear mechanical disintegration. Yet, this process is still highly demanding in energy and costly, slowing down the large-scale production and commercialization of CNFs. Reducing the energy consumption during fibers fibrillation without using any chemical or enzymatic pr… Show more

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Cited by 46 publications
(52 citation statements)
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“…The obtained Hermans' orientation parameter values showed a slight decrease in alignment upon addition of silica. Nevertheless, all average values ranged between 0.19 and 0.26, which corresponds to a moderate alignment (Kriechbaum et al 2018). It can thus be concluded that the addition of silica particles did not significantly disrupt the ice-templating-induced alignment of TOCNF.…”
Section: Resultsmentioning
confidence: 85%
“…The obtained Hermans' orientation parameter values showed a slight decrease in alignment upon addition of silica. Nevertheless, all average values ranged between 0.19 and 0.26, which corresponds to a moderate alignment (Kriechbaum et al 2018). It can thus be concluded that the addition of silica particles did not significantly disrupt the ice-templating-induced alignment of TOCNF.…”
Section: Resultsmentioning
confidence: 85%
“…Orientation index values ranging from approximately 0.56 to 0.82 have been reported for ice-templated nanocellulose networks [ 18 , 24 ]. The value was almost constant at higher fiber contents but dropped dramatically when the suspension concentration was lower than a certain critical value [ 18 ].…”
Section: Resultsmentioning
confidence: 99%
“…It should be noted that the calculated orientation index is related to the orientation of the CNFs in a bundle of filaments and is not directly related to the orientation of the microscopic filaments inside the bundle or to the orientation of the CNFs in single filaments. Orientation index values ranging from approximately 0.56 to 0.82 have been reported for ice-templated nanocellulose networks [18,24]. The value was almost constant at higher fiber contents but dropped dramatically when the suspension concentration was lower than a certain critical value [18].…”
Section: Characterizationmentioning
confidence: 91%
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“…A common method used to produce polymer foams with high shape anisotropy ratio is through the unidirectional freezing of a polymer solution or a polymer suspension, followed by freeze-drying to remove the solvent. Such method has been used to produce graphene oxide-reinforced polyimide foam [17], nanocellulose foam [18] and cellulosemontmorillonite composite foam [19] with high shape anisotropy ratio and mechanical anisotropy. Polymer foams with different shape anisotropy ratio could also be fabricated through controlling the expansion direction of a polymer foam.…”
Section: Introductionmentioning
confidence: 99%