Visualisation of Degree of Acetylation in Beechwood by near Infrared Hyperspectral Imaging

Abstract

Spatial distributions of the degree of acetylation in cross- and radial-sectional faces of beechwood samples under vapour-phase reaction are observed using near infrared hyperspectral imaging. The near infrared second derivative amplitude at 1727 nm, which is assigned to the first overtone of the CH stretching vibration averaged over the cross section and radial section, has strong linear correlation with the substance concentration of acetyl groups (CA) held in the cell walls. Tangentially averaged CA is well explained by the modified rate equation. Both the rate constant and hindrance to the diffusion reagent reach constant values at a depth of about 4 mm from the edge of the wood, indicating that the acetylation reaction proceeds close to a depth of 4 mm.

Keywords

NIR hyperspectral imaging vapour-phase acetylation solid beechwood reaction rate

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