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Diffraction from nonperiodic models of cellulose crystals

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Abstract

Powder and fiber diffraction patterns were calculated for model cellulose crystallites with chains 20 glucose units long. Model sizes ranged from four chains to 169 chains, based on cellulose Iβ coordinates. They were subjected to various combinations of energy minimization and molecular dynamics (MD) in water. Disorder induced by MD and one or two layers of water had small effects on the relative intensities, except that together they reduced the low-angle scattering that was otherwise severe enough to shift the 1 \( \bar {1} \) 0 peak. Other shifts in the calculated peaks occurred because the empirical force field used for MD and minimization caused the models to have small discrepancies with the experimental intermolecular distances. Twisting and other disorder induced by minimization or MD increased the breadth of peaks by about 0.2–0.3° 2-θ. Patterns were compared with experimental results. In particular, the calculated fiber patterns revealed a potential for a larger number of experimental diffraction spots to be found for cellulose from some higher plants when crystallites are well-oriented. Either that, or further understanding of those structures is needed. One major use for patterns calculated from models is testing of various proposals for microfibril organization.

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Notes

  1. In a crystal composed of a 10 × 10 array of polymeric molecules, 36 would be on the surface (36%). In a conventional, sub-millimeter size single-crystal for diffraction, the fraction of molecules on the surface is much less than one percent.

  2. The range of the calculated diffraction was selected after consideration of the number of atoms in the model and the number of pixels for which the intensity must be calculated. These factors determine the computer time required for the calculation. Some of the software used for projects other than reported in this paper was limited in the sizes of data arrays that could be handled. Considering that some models were as large as 94,700 atoms and 18 different size crystals were modeled, each with 14 variations of water content, energy minimization and molecular dynamics, the selected step sizes of 0.003 S out to 0.597 S were considered adequate for the present purposes. Larger calculated patterns are definitely possible.

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Acknowledgments

We thank Paul Langan and Henri Chanzy for helpful comments on a draft of this paper. Jodi Hadden contributed thoughts on twisted crystals.

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Correspondence to Yoshiharu Nishiyama or Alfred D. French.

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Nishiyama, Y., Johnson, G.P. & French, A.D. Diffraction from nonperiodic models of cellulose crystals. Cellulose 19, 319–336 (2012). https://doi.org/10.1007/s10570-012-9652-1

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