Influence of moisture on the vibro-mechanical properties of bio-engineered wood

Gilani, Marjan Sedighi; Tingaut, Philippe; Heeb, Markus; Schwarze, Francis W. M. R.

doi:10.1007/s10853-014-8476-9

Cited by 7 publications

(7 citation statements)

References 20 publications

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“…2d, the peak in sorption hysteresis for wood is a result of scanning isotherms being used to calculate hysteresis, and the peak position changes with the RH from which . The absolute sorption hysteresis from literature data was evaluated from absorption and desorption isotherms from water saturated state (Ahlgren 1972;Fredriksson and Johansson 2016), between absorption and desorption from 94 to 95% RH (Gilani and Schwarze 2015;Gilani et al 2014;Kymäläinen et al 2015;Zillig 2009) and between absorption and desorption from 80% RH (Zillig 2009) desorption is initiated. Whether this is also the case for other biopolymeric materials remains to be investigated.…”

Section: Sorption Hysteresismentioning

confidence: 99%

Scanning or desorption isotherms? Characterising sorption hysteresis of wood

Fredriksson

Thybring

2018

Cellulose

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Sorption isotherms describe the relation between the equilibrium moisture content of a material and the ambient relative humidity. Most materials exhibits sorption hysteresis, that is, desorption give higher equilibrium moisture contents than absorption at equal ambient climate conditions. Sorption hysteresis is commonly evaluated by determination of an absorption isotherm followed by desorption starting from the highest relative humidity used in the absorption measurement (typically 95%). The latter is often interpreted as the desorption isotherm but is in fact a scanning isotherm, i.e. an isotherm obtained from neither dry nor water-saturated state. In the present study, we investigated the difference between desorption isotherms and scanning isotherms determined by desorption from different high relative humidity levels reached by absorption and how this difference influenced the evaluation of sorption hysteresis. The measurements were performed on Norway spruce (Picea abies (L.) Karst.) using automated sorption balances. Hysteresis evaluated from desorption isotherms gave linear absolute sorption hysteresis for the studied relative humidity range (0-96%), whereas hysteresis evaluated from scanning isotherms gave non-linear curves with a peak between 50 and 80% relative humidity. The position of this peak depended on the relative humidity from which desorption was initiated. Consequently, understanding and evaluation of sorption hysteresis might be challenging if scanning isotherms are used instead of desorption isotherms, hereby increasing the risk of misinterpreting the results.

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Section: Sorption Hysteresismentioning

confidence: 99%

Scanning or desorption isotherms? Characterising sorption hysteresis of wood

Fredriksson

Thybring

2018

Cellulose

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“…In these studies, we could even demonstrate aesthetic improvements to the tone wood after fungal treatment. These include a visual en- (Figure 1b,c), improved damping, enhanced sound radiation, and acoustic resistance (Sedighi Gilani & Sedighi Gilani, Tingaut, et al, 2014). Physisporinus vitreus is more active in the sapwood, that is, the region in the top plate close to the f-holes (Figure 1c).…”

Section: Pa S T and Current Re S E Arch On M Ycowoo Dmentioning

confidence: 99%

“…Sedighi Gilani, Tingaut, et al, 2014 Hygric properties of Norway spruce and maple after incubation with P. vitreus.…”

Section: Schwarzeet Al 2008mentioning

confidence: 99%

Banishing the myths and dogmas surrounding the biotech Stradivarius

Schwarze

Morris

2020

Plants People Planet

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Societal Impact Statement The impact of global warming on wood formation means that it is becoming increasingly difficult to find superior‐quality resonance wood for the production of musical instruments. Using fungi, we can mimic the effects of a cold climate on wood, to produce biotech violins with a tone matching those of a Stradivarius. Our work has sparked worldwide interest from the media, music lovers, and violinmakers. Here we address concerns raised about the biotech violin and detail scientific advances made since the original publication of our work. We believe this mycowood technology will enable affordable and acoustically superior instruments to become available to talented young musicians who would otherwise be unable to afford their own Stradivarius.

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“…The first resonance frequency (fR) and internal damping (tanδ) of each wood specimen was determined before and after fungal treatment by a custom developed free-free resonance flexural vibration test [35][36][37]. Each specimen was supported by cotton threads located at the position of the vibration nodes of the fundamental frequency.…”

Section: Influence Of Wood Decay On the Stiffness Of Woodmentioning

confidence: 99%

Influence of Soil Characteristics on Wood Biodeterioration by Brown Rot Fungi

Ribera

Michel²,

Schwarze

2020

Applied Sciences

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Soil conditions can directly influence the inoculum potential of wood decay fungi, which is likely to be a major factor in the premature failure of utility poles across Europe. The objective of our study was to assess the influence of soil pH, humic acid and iron on wood decay. For this purpose, we incubated Fe-impregnated wood specimens on artificial medium to evaluate the influence of the metal on the activity of brown rot fungi. Moreover, the impact of Cu-leaching from impregnated wood specimens that were exposed to humic acid solutions was measured. In addition, weight losses caused by brown rot fungi in impregnated wood pole segments and stiffness (Young’s modulus of Elasticity) of Cu-impregnated wood specimens were quantified. The pH measurements showed that the soil samples were slightly acid (pH = 6.7 ± 0.7). In comparison to non-impregnated controls, the Fe-impregnated samples significantly increased weight losses by brown rot fungi (>30–40%). In the presence of humic acid the release of copper from chromium-free wood preservatives (up to 143.34 mg L−1) was enhanced. Weight losses in impregnated wood segments by brown rot fungi ranged from 5.3 to 20.4%. The recorded reduction in stiffness by brown rot fungi ranged from approximately 3.96 to 55.52% for Cu-impregnated wood specimens after 12 weeks. Our study shows that the pH, humic acid, iron content and selected wood preservatives greatly influence susceptibility of impregnated wood to brown rot fungi during ground contact.

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Influence of moisture on the vibro-mechanical properties of bio-engineered wood

Cited by 7 publications

References 20 publications

Scanning or desorption isotherms? Characterising sorption hysteresis of wood

Scanning or desorption isotherms? Characterising sorption hysteresis of wood

Banishing the myths and dogmas surrounding the biotech Stradivarius

Influence of Soil Characteristics on Wood Biodeterioration by Brown Rot Fungi

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