Microstructural characterization of biobased carbon foam by means of X-ray microtomography and compared to conventional techniques

Merle, Juliette; Sénéchal, Pascale; Guerton, Fabrice; Moonen, Peter; Trinsoutrot, Pierre; Birot, Marc; Bouhtoury, Fatima Charrier–El

doi:10.1039/c6ra16969d

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…Those bias are responsible for the gap between the values obtained by X-ray tomography and MIP. This difference is consistent with characterization results for bio-based carbon foam in Merle et al (2016). Several causes can explain this outcome.…”

Section: Characterization Of the Porositysupporting

confidence: 91%

“…This distinction between the two techniques explains the underestimation of the total porosity by X-ray tomography. However, as underlined in Merle et al (2016) quantitative pore size analysis obtained by MIP has to be qualified, as accessible voids are detected with sizes ranging only from 0.4 nm to 400 µm. Moreover, the pore structure may be destroyed during the test.…”

Section: Characterization Of the Porositymentioning

confidence: 99%

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Influence of types of binder and plant aggregates on hygrothermal and mechanical properties of vegetal concretes

Lagouin

Magniont

Sénéchal

et al. 2019

Construction and Building Materials

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Section: Characterization Of the Porositysupporting

confidence: 91%

Section: Characterization Of the Porositymentioning

confidence: 99%

Influence of types of binder and plant aggregates on hygrothermal and mechanical properties of vegetal concretes

Lagouin

Magniont

Sénéchal

et al. 2019

Construction and Building Materials

Self Cite

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“…The structure of hydrolysable tannins is gallic and ellagic acid-based, taking the form of chains of pentagalloyl glucose and of their degradation products, such as castalagin and castalin. Some authors have stated that they are not recommended for producing foams due to their fragility and friability [8,9]. However, recent work on hydrolysable tannin-based non-isocyanate polyhydroxy urethane foams has shown these conclusions to be incorrect [10,11].…”

Section: Introductionmentioning

confidence: 99%

Development of Water Repellent, Non-Friable Tannin-Furanic-Fatty Acids Biofoams

et al. 2022

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Tannin-furanic foams were prepared with a good yield using the addition of relatively small proportions of a polyflavonoid tannin extract esterified with either palmitic acid, oleic acid, or lauric acid by its reaction with palmitoyl chloride, oleyl chloride, or lauryl chloride. FTIR analysis allowed us to ascertain the esterification of the tannin, and MALDI-TOF analysis allowed us to identify a number of multi-esterified flavonoid oligomers as well as some linked to residual carbohydrates related to the equally esterified tannin. These foams presented a markedly decreased surface friability or no friability at all, and at densities lower than the standard foam they were compared to. Equally, these experimental foams presented a much-improved water repellence, as indicated by their initial wetting angle, its small variation over time, and its stabilization at a high wetting angle value, while the wetting angle of the standard foam control went to zero very rapidly. This conclusion was supported by the calculation of the total surface energy of their surfaces as well as of their dispersive and polar components.

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“…These were determined by processing two different foam formulations. The structural characteristics versus the microstructure have been researched extensively for polymer foams [ 1 , 2 , 3 , 4 , 5 , 6 ], ceramic foams [ 7 , 8 , 9 , 10 ], metal foams [ 9 , 11 , 12 , 13 , 14 ], and carbon foams [ 15 , 16 , 17 , 18 , 19 ], yet, there is no in vitro evidence concerning the relationship between the structural characteristics and microstructure optimisation upon expanding of the one-component PU foams applicable in the building sector, based on the scaffolds of different morphology.…”

Section: Introductionmentioning

confidence: 99%

Morphometric Analysis of One-Component Polyurethane Foams Applicable in the Building Sector via X-ray Computed Microtomography

Blazejczyk

2018

Materials

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A detailed morphometric analysis of one-component polyurethane (PU) expanding foams, with densities of 26 and 28 kg/m3 (‘SUMMER’ and ‘WINTER’ product versions), was conducted to evaluate the topology of the foam cells and to discover processing-to-structure relationships. The microstructural analysis of the heterogeneously distributed pores revealed tight relationships between the foam morphology and the cell topology, depending on the growth rate and local environmental conditions, governed by the properties of the blowing gas used. The most significant morphometric output included the following: open/closed porosity and (heterogeneous) pore distribution, relative density and (homogeneous) strut distribution, and total solid matrix surface and closed pore surface area—at the macroscopic level of the foam. While, at the microscopic level of the cells, the results embraced the following: the size of every detected strut and pore, identified two-dimensional (2D) shapes of the cell faces, and proposed three-dimensional (3D) topologies modelling the PU foam cells. The foam microstructure could be then related with macroscopic features, significant in building applications. Our protocol outlines the common procedures that are currently used for the sample preparation, X-ray scanning, 3D image reconstruction and dataset analysis in the frame of the X-ray computed microtomography (µ-CT) testing of the one-component PU foams, followed by a statistical (multiple Gaussian) analysis and conceptual considerations of the results in comparison with thematic literature.

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Microstructural characterization of biobased carbon foam by means of X-ray microtomography and compared to conventional techniques

Abstract: The objective of this work is to compare three techniques for characterizing the morphology of porous bio-based carbon foam, namely mercury intrusion porosimetry, scanning electron microscopy and X-ray microtomography.

Cited by 9 publications

References 22 publications

Influence of types of binder and plant aggregates on hygrothermal and mechanical properties of vegetal concretes

Influence of types of binder and plant aggregates on hygrothermal and mechanical properties of vegetal concretes

Development of Water Repellent, Non-Friable Tannin-Furanic-Fatty Acids Biofoams

Morphometric Analysis of One-Component Polyurethane Foams Applicable in the Building Sector via X-ray Computed Microtomography

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