NMR cryoporometry to study the fiber wall structure and the effect of drying
Journal article, 2010

NMR cryoporometry has been used for investigating the porosity changes of bleached wood pulp upon drying. This NMR method follows the same principles as thermoporosimetry, which has been used for the same purpose during the last decade and makes it possible to investigate porous material in the water-swollen state. In this study bleached softwood kraft pulp was exposed to a series of drying procedures where the decrease in porosity within the fiber cell wall could be characterized for pore radii below 100 nm. This decrease in porosity is called hornification, which is an irreversible collapse of the fiber wall structure during drying and results in decreased uptake of water and reduced swelling of the fiber upon rewetting. Our results have been compared to the traditionally used water retention value (WRV) and correlates well with these. Furthermore, this NMR method could show the reduction of hornification when adsorbing the hemicellulose glucuronoxylan to the fiber.

Hornification

Pore size

NMR cryoporometry

Fiber porosity

Xylan adsorption

distribution

Author

Åsa Östlund

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Tobias Köhnke

Chalmers, Chemical and Biological Engineering, Organic Chemistry

Lars Nordstierna

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Magnus Nydén

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

SuMo Biomaterials

Cellulose

0969-0239 (ISSN)

Vol. 17 2 321-328

Subject Categories

Chemical Engineering

DOI

10.1007/s10570-009-9383-0

More information

Created

10/7/2017