Characterisation of the porous structure of Gilsocarbon graphite using pycnometry, cyclic porosimetry and void-network modeling

Laudone, Giuliano M.; Gribble, Christopher M.; Matthews, G. Peter

doi:10.1016/j.carbon.2014.02.037

Cited by 29 publications

(13 citation statements)

References 23 publications

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“…The pressure of the mercury injection ranged from 1.3 kPa to 200 MPa, and the pore diameters to be measured were in the range of 0.0072 μm to 1 mm. Assuming that the pores were cylindrical, the pore diameters can be obtained based on the Washburn formula (Laudone et al, 2014):…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional geometry, pore parameter, and fractal characteristic analyses of medium-density fiberboard by X-ray tomography, coupling with scanning electron microscopy and mercury intrusion porosimetry

Shao

Guo

et al. 2020

Journal of Building Physics

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Pore structure parameters are significant for investigating the diffusion properties of volatile organic compounds from building materials. Traditional characterization methods could provide ether surface morphology or some pore parameters of the material, which could not comprehensively reflect the overall information. X-ray tomography, as an advanced nondestructive method, can not only characterize the three-dimensional structure characteristics but also comprehensively measure pore parameters of materials. This study applied X-ray tomography to systematically analyze the geometry and volatile organic compound emission paths of medium-density fiberboard. The three-dimensional structures of pores and materials were reconstructed respectively. The isolated pores and connective pores were extracted to indicate the pore connectivity, and skeletonization was simultaneously applied, allowing visualization of the volatile organic compound diffusion paths. The porosity was 54.67%, and 99.91% of the pores were connective pores. The tortuosity was 2.07, and the fractal dimension was 2.605, indicating the heterogeneity and self-similarity of pore structures. Scanning electron microscopy was used to characterize the two-dimensional morphology of the material, and mercury intrusion porosimetry was applied to analyze the pore parameters. The results were consistent with that of X-ray tomography, and their coupling with X-ray tomography could comprehensively characterize the structures and parameters of indoor building materials, which could contribute significantly to future research on volatile organic compound emission mechanisms and building physics.

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Section: Methodsmentioning

confidence: 99%

Three-dimensional geometry, pore parameter, and fractal characteristic analyses of medium-density fiberboard by X-ray tomography, coupling with scanning electron microscopy and mercury intrusion porosimetry

Shao

Guo

et al. 2020

Journal of Building Physics

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“…Channel formed as aggregate densification occurred, and it consists of voids and connecting throats [24]. Pores are the space surrounded by particles or aggregates, and the throat is the narrow access connecting two particles or aggregates.…”

Section: Channelling Structuresmentioning

confidence: 99%

Raking Effects on Aggregate Densification and Channelling in Thickening

Zhou

Wang

Jiao

et al. 2019

Advances in Materials Science and Engineering

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Thickening performance is greatly influenced by aggregate densification and channelling development; however, the microstructures of aggregates and channelling are unable to directly observe because of high turbidity mud bed during thickening. Computed tomography scan imaging technique has been introduced to investigate the effects of aggregate densification and channelling in the mud bed samples during unclassified tailings thickening. The samples were prepared through deep-freezing and freeze-drying techniques, immediately after sampling from the operation of a pilot thickener. Based on the information of void ratio, pore-size distribution, and permeability, obtained from 3D reconstruction images of the aggregates structure, aggregate densification and channelling development have been characterized. Channelling patterns have been classified by the size and shape of the connection throat of the pore between aggregates. As the aggregate structure broke and densified, the void ratio and pore size of the mud bed were decreased. Thickening performance enhancement was predicted based on solid flux and permeability of mud bed, and the result indicated raking on aggregate densification and channelling apparently improves the unclassified tailings dewatering extent.

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“…The effects of component geometry are also important; for instance, a combined experimental-theoretical approach for studying the size effect on the fracture resistance of graphite was proposed in [17], proposing a modified maximum tangential stress fracture criterion that determined the extent of fracture process zone around the crack tip. As the graphite pore size ranges from several nanometres to several millimetres [18], a multi-scale modelling approach is required.…”

Section: Introductionmentioning

confidence: 99%

A multi-scale three-dimensional Cellular Automata fracture model of radiolytically oxidised nuclear graphite

Vertyagina

Marrow

2017

Carbon

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A multi-scale approach for fracture simulation, based on the Cellular Automata technique, has been developed and then applied to a nuclear graphite that is used in structural components of the UK Advanced Gas-cooled Reactors (AGR). High resolution X-ray computed tomographs of Gilsocarbon grade graphite, with up to 68% weight loss by radiolytic oxidation, provide quantitative descriptions of the porosity within its constitutive filler particles and their surrounding matrix. The statistical distributions for tensile strength and elastic modulus obtained from small models of the filler and matrix are introduced to a large scale model of the heterogeneous microstructure. These microstructure-derived simulations achieve a good agreement with experimental data. The computationally efficient analysis is then used to investigate the stochastic effects on mechanical properties of possible variations in the microstructure between individual small test specimens. As these may represent material of nominally the same microstructure, there is an apparent increase in the variability of strength and modulus at high weight loss.

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Characterisation of the porous structure of Gilsocarbon graphite using pycnometry, cyclic porosimetry and void-network modeling

Cited by 29 publications

References 23 publications

Three-dimensional geometry, pore parameter, and fractal characteristic analyses of medium-density fiberboard by X-ray tomography, coupling with scanning electron microscopy and mercury intrusion porosimetry

Three-dimensional geometry, pore parameter, and fractal characteristic analyses of medium-density fiberboard by X-ray tomography, coupling with scanning electron microscopy and mercury intrusion porosimetry

Raking Effects on Aggregate Densification and Channelling in Thickening

A multi-scale three-dimensional Cellular Automata fracture model of radiolytically oxidised nuclear graphite

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