Measuring biofoam anisotropy using optical coherence tomography

Jonatan Mac Intyre, Doruntina Raka, Mehmet Aydin, Leevi Viitanen, Juha Koivisto

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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.
Original languageEnglish
Pages (from-to)11663-11672
Number of pages10
JournalJournal of Materials Science
Issue number25
Early online date27 May 2022
Publication statusPublished - 27 May 2022
MoE publication typeA1 Journal article-refereed


  • Biofoams
  • Optical coherence tomography
  • Anisotropic material
  • Geometrical properties}


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