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The Nature of the Supramolecular Structural Variation and Hydrophilic Properties of Cellulose during Water Sorption

Abstract

Water sorption on cellulose was studied in detail. The mechanism of the adsorption–desoprtion hysteresis loop was considered using NMR relaxation methods and sorption phenomena. The degree of crystallinity was found to decrease in cellulose during water sorption, while the specific surface area of cellulose increased because a wedging pressure arose as a new adsorbent–adsorbate interface formed. The most significant changes in these parameters were observed during desorption and were accompanied by the formation of an additional capillary-porous system in cellulose. Correlations were observed between the surface tension coefficient at the solid–liquid interface, the adsorption equilibrium constant, and the net heat of adsorption.

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Correspondence to Yu. B. Grunin or M. S. Ivanova.

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Conflict of interests. The authors declare that they have no conflict of interest.

This article does not contain any studies involving animals or human subjects performed by any of the authors.

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Translated by T. Tkacheva

Abbreviations: FID, free induction decay; EF, elementary fibril.

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Grunin, Y.B., Ivanova, M.S., Masas, D.S. et al. The Nature of the Supramolecular Structural Variation and Hydrophilic Properties of Cellulose during Water Sorption. BIOPHYSICS 64, 866–869 (2019). https://doi.org/10.1134/S0006350919060071

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  • DOI: https://doi.org/10.1134/S0006350919060071

Keywords:

  • cellulose
  • supramolecular structure
  • hysteresis
  • net heat of adsorption
  • surface tension coefficient
  • nuclear magnetic resonance