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Dynamics of water bound to crystalline cellulose.

Abstract：

:Interactions of water with cellulose are of both fundamental and technological importance. Here, we characterize the properties of water associated with cellulose using deuterium labeling, neutron scattering and molecular dynamics simulation. Quasi-elastic neutron scattering provided quantitative details about the dynamical relaxation processes that occur and was supported by structural characterization using small-angle neutron scattering and X-ray diffraction. We can unambiguously detect two populations of water associated with cellulose. The first is "non-freezing bound" water that gradually becomes mobile with increasing temperature and can be related to surface water. The second population is consistent with confined water that abruptly becomes mobile at ~260 K, and can be attributed to water that accumulates in the narrow spaces between the microfibrils. Quantitative analysis of the QENS data showed that, at 250 K, the water diffusion coefficient was 0.85 ± 0.04 × 10-10 m2sec-1 and increased to 1.77 ± 0.09 × 10-10 m2sec-1 at 265 K. MD simulations are in excellent agreement with the experiments and support the interpretation that water associated with cellulose exists in two dynamical populations. Our results provide clarity to previous work investigating the states of bound water and provide a new approach for probing water interactions with lignocellulose materials.

journal_name

Sci Rep

journal_title

Scientific reports

authors

O'Neill H,Pingali SV,Petridis L,He J,Mamontov E,Hong L,Urban V,Evans B,Langan P,Smith JC,Davison BH

doi

10.1038/s41598-017-12035-w

subject

Has Abstract

pub_date

2017-09-19 00:00:00

pages

11840

issue

1

issn

2045-2322

pii

10.1038/s41598-017-12035-w

journal_volume

7

pub_type

杂志文章

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