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Gewählte Master / Diploma Thesis:

Johannes Plackner (2009): The Converse Piezoelectric Effect in Wood and Cellulose Materials.
Master / Diploma Thesis - Holzforschung und Holztechnologien (WST), BOKU-Universität für Bodenkultur, pp 64. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Abstract:
Wood and crystalline cellulose materials are known for exhibiting piezoelectric behavior. The direct piezoelectric effect (formation of an electric field along the surface when exposing to mechanical stress) is well researched. The converse piezoelectric effect, the change of mechanical properties due to application of an electric field was, however, never the aim of comprehensive research. Two materials were investigated, native wood and regenerated cellulose. The wood samples were cut from pine wood blocks and measured 0,2x8x80 mm. The cellulose samples had the same dimensions. They were obtained from cellulose foils produced by partly dissolving highly crystalline cellulose powder with dimethylacetamide. To orient the fibers, the foils were stretched before testing. The samples have been analyzed by the means of conventional stress measurement to quantify the piezoelectric response and by wide angle x-ray scattering (WAXS) to understand the underlying principles. The results showed a clear mechanical reaction on the electric field for wood, and a smaller, yet detectible reaction for the cellulose foils. For wood, the WAXS data indicated widening of the cellulose molecules within the crystallite. The cellulose samples didn’t show any response during the WAXS experiments.

Beurteilende(r): Gindl-Altmutter Wolfgang

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