Indirect evidence of supramolecular changes within cellulose microfibrils of chemical pulp fibers upon drying

Kontturi, Eero; Vuorinen, Tapani

doi:10.1007/s10570-008-9235-3

Cited by 82 publications

(63 citation statements)

References 36 publications

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“…The average length is similar to the smaller values reported in the literature for wood pulp derived CNCs, which vary between 65 and 120 nm. 28,31,32 The variations in size may reflect differences between samples, although one cannot rule out a contribution from selection of specific particle sizes either in the sample deposition or during the analysis. The average widths measured by TEM (8.0 and 7.1 nm for the two data sets) are larger than the height measurements from AFM.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Correlating Cellulose Nanocrystal Particle Size and Surface Area

Brinkmann¹,

Chen²,

Couillard³

et al. 2016

Langmuir

144

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1021/acs.langmuir.6b01376Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Correlating cellulose nanocrystal particle size and surface area Brinkmann, Andreas; Chen, Maohui; Couillard, Martin; Jakubek, Zygmunt J.; Leng, Tianyang; Johnston, Linda J.http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/droits L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=df1fceea-c08d-4b99-8897-d9370e2db3c7 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=df1fceea-c08d-4b99-8897-d9370e2db3c7Correlating Cellulose Nanocrystal Particle Size and Surface Area ABSTRACT: Cellulose nanocrystals (CNCs) are negatively charged nanorods that present challenges for characterization of particle size distribution and surface areatwo of the common parameters for characterizing nanomaterials. CNC size distributions have been measured by two microscopy methods: atomic force microscopy (AFM) and transmission electron microscopy (TEM). The agreement between the two methods is good for length measurements, after taking into consideration tip-convolution effects for AFM. However, TEM widths are almost twice as large as AFM heightsan effect that we hypothesize is due to counting of a larger fraction of laterally associated CNCs in the TEM images. Overall, the difficulty of selecting individual particles for analysis and possible bias due to selection of a specific particle size during sample deposition are the main limitations associated with the microscopy measurements. The microscopy results were compared to Zaverage data from dynamic light scattering, which is a useful method for routine analysis and for examining trends in size as a function of sample treatment. Measurements as a function of sonication energy...

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Correlating Cellulose Nanocrystal Particle Size and Surface Area

Brinkmann¹,

Chen²,

Couillard³

et al. 2016

Langmuir

144

View full text Add to dashboard Cite

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“…Hence, the first drying from native state has been reported to produce irreversible changes to the structure (Suchy et al 2010b). As moisture is removed from cell walls during drying, some of the constituent molecules are thought to collapse into hydrogen-bonded configurations that cannot be fully re-wetted by water (Kontturi and Vuorinen 2009;Suchy 2011;Suchy et al 2010a, b). This phenomenon of lower hydroxyl accessibility is well-known for some types of wood pulps and is termed hornification.…”

Section: Introductionmentioning

confidence: 99%

“…Deuterated water has been used in a number of studies to assess wood cell wall hydroxyl accessibility to water (Altaner et al 2006;Chow 1972;Fackler and Schwanninger 2011;Fernandes et al 2011;Kontturi and Vuorinen 2009;Suchy 2011;Suchy et al 2010a, b;Sumi et al 1964;Taniguchi et al 1966Taniguchi et al , 1978, as functional groups capable of forming H-bonded complexes with water can have their hydrogen exchanged with deuterium (Englander et al 1972). This exchange can be detected by spectroscopic or gravimetric techniques, both of which are employed in the current study.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyl accessibility in wood cell walls as affected by drying and re-wetting procedures

2017

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The first drying of wood cell walls from the native state has sometimes been described as producing irreversible structural changes which reduce the accessibility to water, a phenomenon often referred to as hornification. This study demonstrates that while changes do seem to take place, these are more complex than what has hitherto been described. The accessibility of wood cell wall hydroxyls to deuteration in the form of liquid water was not found to be affected by drying, since vacuum impregnation with liquid water restores the native cell wall accessibility. Contrary to this, hydroxyl accessibility to deuteration by water vapour was found to decrease to different levels depending on the drying conditions. Vacuum drying at 60°C for 3 days reduced the accessibility more than drying for 1 day at 103°C without vacuum. Drying for 3 days at 103°C increased the hydroxyl accessibility compared to 1 day. Moreover, the decrease in hydroxyl accessibility to deuteration by water vapour induced by the first drying could be at least partially erased by subsequent vacuum impregnation with liquid water, indicating reversibility. For the drying of solid, non-degraded wood cell walls the results challenge the often supposed process of hornification, understood as a permanent decrease in hydroxyl accessibility to water.

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“…This scenario resembles the drying of 96% pulp where small quantities of extractable hemicellulose and degraded cellulose/short chain glucan do not inhibit the aggregation of fibrils. While this study shows the changes in LFAD upon drying in the radial direction of the fibril, there have been studies that showed that relatively pure forms of cellulose (cellulose nanocrystals) also experience changes in the longitudinal direction upon drying [44].…”

Section: M E N S I O N S U P O N D R Y I N G I S S U P P O R T Ementioning

confidence: 61%