Porosity estimation of Phyllostachys edulis (Moso bamboo) by computed tomography and backscattered electron imaging

Abstract

This study aims to investigate and quantify the porosity in the cross section of Phyllostachys edulis (Moso bamboo) culm wall. The porosity results are expected to be utilised in numerical study of heat and moisture transfer. Computed tomography (CT) and backscattered electron (BSE) imaging methods are utilised in this study because these two methods allow measurements of the anisotropic features of bamboo specimens. The results of these two methods can be represented as the function of the real dimension rather than the pore size distribution of the specimen. The specimens are obtained from eight different locations along the Moso bamboo culms. Both internodes and nodes specimens are measured in this study. The average porosity, standard deviation (SD) and coefficient of variation (COV) are calculated for BSE and CT results. Pearson product-moment correlation coefficient (PPMCC) is also calculated in this study to analyse the correlation between the BSE results and CT results. Typical porosity results from 400 sampling points and 10 portions average porosity are analysed in this study. The CT scanning results show similar trend with BSE results. The correlation relationship between BSE and CT results approaches moderate correlation level to strong correlation level. The average porosity of internode specimens is from 43.9 to 58.8 % by BSE measurement and from 44.9 to 63.4 % by CT measurement. The average porosity of node specimens is from 37.4 to 56.6 % by BSE measurement and from 32.1 to 62.2 % by CT measurement.

Photoacoustic Sensing of Trapped Fluids in Nanoporous Thin Films: Device Engineering and Sensing Scheme

“…In the previous discussion, we assumed a homogeneous infiltration scheme. We now argue that the proposed sensing platform may be exploited to gain insights into the fluid infiltration pattern, a yet unsolved issue in nanoporous materials and forming the object of extensive research. ,, Let us analyze the layered infiltration pattern which comprises two scenarios. The “water layer on top” (L-TOP) scenario consists of a water infiltrated layer sitting on top of an empty one (see the inset at the bottom-left corner of Figure ).…”

“…We now argue that the proposed sensing platform may be exploited to gain insight into the fluid infiltration pattern, a yet unsolved issue in nanoporous materials and forming the object of extensive research. 13,56,57 Let's analyse the layered infiltration pattern which comprises two scenarios.…”

Heat and moisture diffusion in spruce and wood panels computed from 3-D morphologies using the Lattice Boltzmann method

“…Tomography allows a non-destructive description of the internal structure of a material. By its feature of non-destructive imaging and its ability to observe without the need to prepare a surface, the use of X-ray computed micro-tomography became a classical facility to observe various aspects of wood structure, for example to quantify anatomical features or determine density (Steppe et al, 2004;Van den Bulcke et al, 2009;Huang et al, 2017), to observe musical instrument (Osborne et al, 2016), to observe archaeological wood (Stelzner and Million, 2015) or to assess wood decay (Van den Bulcke et al, 2008;Hervé et al, 2014). Lux et al (Lux et al, 2006) studied the morphology of wood-based fibrous materials using X-ray tomography.…”

Mechanical Behavior and High Formability of Palm Leaf Materials

“…Bamboo wood, one of the most widely used structural plant materials, has a porosity of 0.3–0.7. [ 36,37,39 ] In general, as the matrix can accommodate large deformation via pore closure, both when dry (Figure 4) and when hydrated, one may expect the areca sheath structure to be more favorable for formability relative to bamboo wood. Although bamboo has been used in foodware products, there is very little product manufacturing via direct forming routes.…”