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Water in cellulose: evidence and identification of immobile and mobile adsorbed phases by 2H MAS NMR
RISE, Innventia. RISE - Research Institutes of Sweden, Bioeconomy. KTH Royal Institute of Technology, Sweden .
KTH Royal Institute of Technology, Sweden .
RISE, Innventia. RISE - Research Institutes of Sweden, Bioeconomy. KTH Royal Institute of Technology, Sweden .
KTH Royal Institute of Technology, Sweden .
2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, 4360-4369 p.Article in journal (Refereed) Published
Abstract [en]

The organization of water molecules adsorbed onto cellulose and the supramolecular hydrated structure of microfibril aggregates represents, still today, one of the open and complex questions in the physical chemistry of natural polymers. Here, we investigate by 2H MAS NMR the mobility of water molecules in carefully 2H-exchanged, and thereafter re-dried, microcrystalline cellulose. By subtracting the spectral contribution of deuteroxyls from the spectrum of hydrated cellulose, we demonstrate the existence of two distinct 2H2O spectral populations associated with mobile and immobile water environments, between which the water molecules do not exchange at the NMR observation time scale. We conclude that those two water phases are located at differently-accessible adsorption sites, here assigned to the cellulose surfaces between and within the microfibril aggregates, respectively. The superior performance of 2H MAS NMR encourages further applications of the same method to other complex systems that expose heterogeneous hygroscopic surfaces, like wood cell walls.

Place, publisher, year, edition, pages
2017. Vol. 19, 4360-4369 p.
Keyword [en]
cellulose, water, adsorption, microcrystalline cellulose, nuclear magnetic resonance
National Category
Chemical Sciences Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-30307DOI: 10.1039/c6cp08219jOAI: oai:DiVA.org:ri-30307DiVA: diva2:1131306
Available from: 2017-08-14 Created: 2017-08-14 Last updated: 2017-10-06Bibliographically approved

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InnventiaBioeconomy
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Physical Chemistry, Chemical Physics - PCCP
Chemical SciencesPaper, Pulp and Fiber Technology

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Citation style
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