Soft x-ray scanning microtomography with submicrometer resolution

McNulty, Ian; Haddad, Waleed S.; Trebes, J. E.; Anderson, Erik H.

doi:10.1063/1.1145930

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…In addition, scanning transmission X-ray microscopes (STXMs) operating at the National Synchrotron Light Source and Advanced Photon Source have been used for nano-tomography. The latest laboratory-based X-ray nano-tomography can achieve a resolution of 400 nm with detectability of 100-200 nm (McNulty et al, 1995;Warwick et al, 1998;Cai et al, 2000;Parkinson and Sasov, 2008). Recently, X-raymicro-tomography has been used to quantify liquid water saturation distribution in porous GDLs and determining the Q1 two-phase material parameters with a sub 10 mm resolution (Becker et al, 2008;Sinha et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Influence of threshold variation on determining the properties of a polymer electrolyte fuel cell gas diffusion layer in X-ray nano-tomography

Ostadi

Rama

Liu

et al. 2010

Chemical Engineering Science

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Morphological parameters of a 3D binary image of a porous carbon gas diffusion layer (GDL) for polymer electrolyte fuel cells (PEFC) reconstructed using X-ray nano-tomography scanning have been obtained, and influence of small alterations in the threshold value on the simulated flow properties of the reconstructed GDL has been determined. A range of threshold values with 0.4% increments on the greyscale map have been applied and the gas permeability of the binary images have been calculated using a single-phase lattice Botlzmann model (LBM), which is based on the treatment of nineteen velocities in the three dimensional domain (D3Q19). The porosity, degrees of anisotropy and the mean pore radius have been calculated directly from segmented voxel representation. A strong relationship between these parameters and threshold variation has been established. These findings suggest that threshold selection can significantly affect some of the flow properties and may strongly influence the computational simulation of micro and nano-scale flows in a porous structure.

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Section: Introductionmentioning

confidence: 99%

Influence of threshold variation on determining the properties of a polymer electrolyte fuel cell gas diffusion layer in X-ray nano-tomography

Ostadi

Rama

Liu

et al. 2010

Chemical Engineering Science

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“…; ሺ݆ ൌ ‫,ݔ‬ ‫,ݕ‬ ‫ݖ‬ሻ [4] Flow is assumed to have reached steady state when the tolerance Ω ൏ 10 ିହ is satisfied.…”

Section: Calculation Of Fluid Transport Parametermentioning

confidence: 99%

“…X-ray images can be generated using high resolution microtomography and nanotomography scanners. The former provides a resolution of 1-10 m, while the later can produce a resolution less than 100 nm [4,5].…”

Section: Introductionmentioning

confidence: 99%

Threshold Fine-Tuning and 3D Characterisation of Porous Media Using X-ray Nanotomography

Ostadi¹,

Rama²,

Liu³

et al. 2010

CNANO

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Citation: OSTADI, H.... et al., 2010. Threshold fine-tuning and 3D characterisation of porous media using X-ray nanotomography. Current Nanoscience, Abstract: A common challenge in the X-ray nanotomography of porous media, such as fuel cell gas diffusion layers (GDLs), is to binarize nanotomography greyscale images in order to differentiate between solids and voids for structural characterisation and numerical flow analysis. In the process threshold determination is critical. This paper presents a study on determination of and fine-tuning threshold value based on comparison of material porosity and average fibre diameter obtained from nanotomography images with porosity data from density experiments and average fibre diameter achieved from scanning electron microscopy images respectively. The more accurate 3D reconstructed model is then used to calculate pore size distribution and average pore size, while the gas permeability of the representative 3D binary images are calculated using a single phase Lattice Boltzmann (LB) model in the D3Q19 regime.

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“…The former provides a resolution of 1-10 lm, while the later can produce a resolution 100 nm. Recently, X-ray nanotomography at resolution of 700 nm has been used to determine the two-phase material parameters of a GDL [3][4][5][6][7][8]. Here, an Xray nanotomographical technique with 680 nm resolution has been used on GDL layers to determine the structural and fluid transportation parameters of a real GDL structure.…”

Section: Introductionmentioning

confidence: 99%

Nanotomography based study of gas diffusion layers

Ostadi

Rama

Liu

et al. 2010

Microelectronic Engineering

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Nano-computed tomography (nanoCT) was used for non-invasive 3D visualization and characterization of porous gas diffusion layer (GDL) for polymer electrolyte membrane fuel cells (PEMFC). The study was conducted using reconstruction of 3D images of a GDL of polymer electrolyte fuel cell to determine the critical nanostructural parameters of the layer, such as porosity, mean pore radii, structure model index and degrees of anisotropy. Furthermore, permeability of the GDL was obtained through lattice Boltzmann numerical modeling.

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Soft x-ray scanning microtomography with submicrometer resolution

Cited by 16 publications

References 11 publications

Influence of threshold variation on determining the properties of a polymer electrolyte fuel cell gas diffusion layer in X-ray nano-tomography

Influence of threshold variation on determining the properties of a polymer electrolyte fuel cell gas diffusion layer in X-ray nano-tomography

Threshold Fine-Tuning and 3D Characterisation of Porous Media Using X-ray Nanotomography

Nanotomography based study of gas diffusion layers

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