Measuring biofoam anisotropy using optical coherence tomography

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-05-27
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Mcode
Degree programme
Language
en
Pages
Series
Journal of Materials Science
Abstract
Optical coherence tomography enables quick scans of translucent objects in a simple environment. Here, we apply this technique to wood-based biofoam. We measure the geometrical properties of the foam, such as bubble eccentricity and density fluctuations, in addition to characterising the possible orientation of fibres. We find that the wood-based foams are extremely suitable for optical coherence tomography due to their translucent nature and large changes of optical density between air-filled bubbles and solid films. Measurement of bubble eccentricity revealed a reasonably high aspect ratio of 1:2, enabling the orientation of long cellulose fibres if added to the mixture. The results demonstrate an effective method to characterise foamlike metamaterials. Furthermore, focusing on eccentricity enables the adjustment of the foam’s manufacturing method and, in turn, helps to produce anisotropic structures.
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Keywords
Biofoams, Optical coherence tomography, Anisotropic material, Geometrical properties}
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Citation
Mac Intyre , J , Raka , D , Aydin , M , Viitanen , L & Koivisto , J 2022 , ' Measuring biofoam anisotropy using optical coherence tomography ' , Journal of Materials Science , vol. 57 , no. 25 , pp. 11663-11672 . https://doi.org/10.1007/s10853-022-07297-3