Micro/nano-structural evolution in spruce wood during soda pulping
Artikel i vetenskaplig tidskrift, 2021

Alkaline delignification of wood tissue is the core of the global pulping technology and the most prominent large-scale separation of the main wood components. This work aims at improved understanding of the interplay between the topochemistry of alkaline pulping and the associated morphological changes. Morphology and chemical structure of partially soda-delignified wood chips were studied combining X-ray tomography (XRT), X-ray diffraction analysis and compositional characterization (lignin and carbohydrate content). The XRT studies of wet samples (providing 3D structural information without interfering drying effects), allowed observation of the cell wall separation as an increasing amount of lignin was removed with the increasing pulping time. Comparison between the microstructure of the surface and the central parts of the treated chips showed a more delignified microstructure at the surface, which highlights the dependence of the delignification process on the mass transport (hydroxide ions and lignin fragments) through the wood tissue. The crystallite size of cellulose increased in the <200> crystal planes during the early stage of pulping while there was little effect on the <110> plane.

X-ray tomography

microstructure

soda pulping

spruce wood

delignification

Författare

Ahmed Wagih Abdallah Abdel Hady

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Zagazig University

Merima Hasani

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

S. Hall

Lunds universitet

Lund Institute of Advanced Neutron and X-ray Science (LINXS)

Hans Theliander

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Holzforschung

0018-3830 (ISSN) 1437-434X (eISSN)

Vol. In Press

FORMAX-portalen - access till avancerade röntgenmetoder för skogsindustrin

Vetenskapsrådet (VR), 2018-11-01 -- 2021-12-31.

Ämneskategorier

Trävetenskap

Pappers-, massa- och fiberteknik

Kompositmaterial och -teknik

DOI

10.1515/hf-2020-0113

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Senast uppdaterat

2021-03-16