1. Moisture-dependent transition from strong to weak hydrogen bonding in wood polysaccharidesFilip Majstorović, Jakub Michal Sandak, 2026, original scientific article Abstract: Near-infrared (NIR) spectroscopy combined with multivariate analysis was employed to investigate moisture- dependent hydrogen bonding of water in softwood cell walls. Spectral variations at equilibrium moisture con- tents were analyzed using principal component analysis and perturbation-correlation moving-window two- dimensional correlation spectroscopy to distinguish water populations with varying hydrogen-bond strengths. A distinct transition in hydrogen-bonding behavior was identified at approximately 10% wood moisture content. Below this threshold, water was found to predominantly engage in strong hydrogen bonds within wood cell walls. Above 10% moisture content, the relative contribution of strong hydrogen bonds to the overall wood- water hydrogen bond network decreased, whereas weakly hydrogen-bonded population became increasingly dominant. Experiments on modified wood and isolated polymers indicated that this transition originates mainly from wood polysaccharides, while lignin plays a minor role. These findings provide strong evidence for distinct water populations in wood cell walls, distinguished by their intermolecular hydrogen-bonding energies and predominant at specific wood moisture contents
Keywords: infrared spectroscopy, wood-water interactions, hydrogen bonding, wood cell wall, cellulose
Published in RUP: 05.06.2026; Views: 466; Downloads: 20
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2. Feasibility of portable NIR spectrometer for quality assurance in glue-laminated timber productionJakub Michal Sandak, Peter Niemz, Andreas Hänsel, Juana Mai, Anna Malgorzata Sandak, 2021, original scientific article Keywords: near infrared spectroscopy, glue-laminated timber, glulam, delamination, quality assurance
Published in RUP: 18.10.2021; Views: 5470; Downloads: 27
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3. Brain imaging with functional near-infrared spectroscopy in educational researchNežka Sajinčič, Anna Malgorzata Sandak, Jakub Michal Sandak, Andreja Istenič, 2021, published scientific conference contribution abstract Keywords: functional near-infrared spectroscopy (fNIRS), functional neuroimaging, educational research, ecological validity, electro-encephalography (EEG), functional magnetic resonance imaging (fMRI)
Published in RUP: 06.05.2021; Views: 3721; Downloads: 17
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6. Chemical and appearance changes of wood due to artificial weathering - dose-response modelMarta Petrillo, Jakub Michal Sandak, Paolo Grossi, Anna Malgorzata Sandak, 2019, original scientific article Keywords: wood weathering, dose-response model, multi-sensor measurement, near infrared, colour, gloss
Published in RUP: 13.02.2019; Views: 5269; Downloads: 184
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