Moisture changes in the plant cell wall force cellulose crystallites to deform

Zabler, Simon; Paris, Oskar; Burgert, Ingo; Fratzl, Peter

doi:10.1016/j.jsb.2010.04.013

Cited by 82 publications

(76 citation statements)

References 53 publications

(55 reference statements)

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“…2). Allowing for the asymmetry of the reflection profiles γ was determined as 101°AE 0.5°at saturation, greater than the maximum value calculated previously (36). Assuming that both reflections were of equal width and applying the same disorder correction as for the 200 reflection, the mean Scherrer dimension normal to the (1-10) and (110) planes was 2.6 AE 0.1 nm (n ¼ 4).…”

Section: Resultsmentioning

confidence: 94%

“…Also the above value for the mean of the dimensions in the directions normal to (1-10) and (110) depends on the assumption that the disorder parameter is the same in all radial directions; and all estimates of radial broadening, even that of the 200 reflection, depend strongly on the function assumed for the noncrystalline background. We used a background function measured in the region away from the equator, whereas others have derived model backgrounds from disordered materials such as lignin (19,49) or joined minima in the radial profiles (36).…”

Section: Resultsmentioning

confidence: 99%

“…The diameter of the cellulose fibrils and the proportion of crystalline material are key inputs into our understanding of the mechanical performance of cellulose (34)(35)(36) and into calculations of the strength of wood, textile fibers, and cellulose-based nanocomposite materials (37,38). In addition cellulose "crystallinity" and aggregation control accessibility to glucanase enzymes (39) and are thus important but rather poorly defined questions in the technology of liquid biofuel production from cellulosic biomass.…”

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confidence: 99%

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Nanostructure of cellulose microfibrils in spruce wood

Fernandes

Thomas

Altaner

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

626

693

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The structure of cellulose microfibrils in wood is not known in detail, despite the abundance of cellulose in woody biomass and its importance for biology, energy, and engineering. The structure of the microfibrils of spruce wood cellulose was investigated using a range of spectroscopic methods coupled to small-angle neutron and wide-angle X-ray scattering. The scattering data were consistent with 24-chain microfibrils and favored a "rectangular" model with both hydrophobic and hydrophilic surfaces exposed. Disorder in chain packing and hydrogen bonding was shown to increase outwards from the microfibril center. The extent of disorder blurred the distinction between the I alpha and I beta allomorphs. Chains at the surface were distinct in conformation, with high levels of conformational disorder at C-6, less intramolecular hydrogen bonding and more outward-directed hydrogen bonding. Axial disorder could be explained in terms of twisting of the microfibrils, with implications for their biosynthesis.crystallinity | infrared | deuterium exchange | nuclear magnetic resonance | spin diffusion

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Nanostructure of cellulose microfibrils in spruce wood

Fernandes

Thomas

Altaner

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

626

693

View full text Add to dashboard Cite

show abstract

“…When water enters the cell wall, it therefore causes swelling of the material, occupying space between the microfibrils and thereby forcing them apart. Furthermore, the microfibrils themselves experience a change in dimensions Yamamoto 2005, 2006;Zabler et al 2010;Toba et al 2012). Swelling also results in increased cell wall dimensions.…”

Section: Hygro-expansion and Sorption Hysteresismentioning

confidence: 99%

A critical discussion of the physics of wood–water interactions

et al. 2012

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This paper reviews recent findings on wood-water interaction and puts them into context of established knowledge in the field. Several new findings challenge prevalent theories and are critically discussed in an attempt to advance current knowledge and highlight gaps. The focus of this review is put on water in the broadest concept of wood products, that is, the living tree is not considered. Moreover, the review covers the basic wood-water relation, states and transitions. Secondary effects such as the ability of water to alter physical properties of wood are only discussed in cases where there is an influence on state and/or transition.

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“…Swelling of the lattice parameter a is also known to occur during dehydration of crystalline cellulose (Zabler et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Modeling of negative Poisson’s ratio (auxetic) crystalline cellulose Iβ

Yao

Alderson²,

Alderson

2016

Cellulose

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Energy minimizations for unstretched and stretched cellulose models using an all-atom empirical force field (molecular mechanics) have been performed to investigate the mechanism for auxetic (negative Poisson's ratio) response in crystalline cellulose I b from kraft cooked Norway spruce. An initial investigation to identify an appropriate force field led to a study of the structure and elastic constants from models employing the CVFF force field. Negative values of on-axis Poisson's ratios m 31 and m 13 in the x 1 -x 3 plane containing the chain direction (x 3 ) were realized in energy minimizations employing a stress perpendicular to the hydrogen-bonded cellobiose sheets to simulate swelling in this direction due to the kraft cooking process. Energy minimizations of structural evolution due to stretching along the x 3 chain direction of the 'swollen' (kraft cooked) model identified chain rotation about the chain axis combined with inextensible secondary bonds as the most likely mechanism for auxetic response.

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Moisture changes in the plant cell wall force cellulose crystallites to deform

Cited by 82 publications

References 53 publications

Nanostructure of cellulose microfibrils in spruce wood

Nanostructure of cellulose microfibrils in spruce wood

A critical discussion of the physics of wood–water interactions

Modeling of negative Poisson’s ratio (auxetic) crystalline cellulose Iβ

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