Effect of the porous structure of graphite on atomic hydrogen diffusion and inventory

Warrier, M.; Schneider, R.; Salonen, E.; Nordlund, K.

doi:10.1088/0029-5515/47/12/003

Cited by 15 publications

(20 citation statements)

References 22 publications

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“…As can be observed, there is no preferential temperature for the hydrogen taking off in the outgassing process. This fact may suggest a simple process of outgassing without a hydrogen diffusion mechanism [19], which has been widely described in the scientific literature. …”

Section: Resultsmentioning

confidence: 99%

Confident methods for the evaluation of the hydrogen content in nanoporous carbon microfibers

Culebras

Madroñero²,

Cantarero

et al. 2012

Nanoscale Res Lett

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Nanoporous carbon microfibers were grown by chemical vapor deposition in the vapor-liquid solid mode using different fluid hydrocarbons as precursors in different proportions. The as-grown samples were further treated in argon and hydrogen atmospheres at different pressure conditions and annealed at several temperatures in order to deduce the best conditions for the incorporation and re-incorporation of hydrogen into the microfibers through the nanopores. Since there are some discrepancies in the results on the hydrogen content obtained under vacuum conditions, in this work, we have measured the hydrogen content in the microfibers using several analytical methods in ambient conditions: surface tension, mass density, and Raman measurements. A discussion on the validity of the results obtained through the correlation between them is the purpose of the present work.

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Section: Resultsmentioning

confidence: 99%

Confident methods for the evaluation of the hydrogen content in nanoporous carbon microfibers

Culebras

Madroñero²,

Cantarero

et al. 2012

Nanoscale Res Lett

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“…The input data used include diffusivity, trap sites, etc. and are shown in Table 1 and Table 2, where most of these were used in MD or KMC simulations [14,15,16,25] and gleaned from either experiments (E D , E HD or an educated guess was used (like ω o corresponds to typical phonon frequency [19]). The backscattering rate R is from [27].…”

Section: Hydrogen Isotope Retention In Porous Materialsmentioning

confidence: 99%

Modelling of hydrogen isotope inventory in mixed materials including porous deposited layers in fusion devices

Sang¹,

Bonnin²,

Warrier³

et al. 2012

Nucl. Fusion

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Abstract.Hydrogen isotopes inventory (HII) is a key issue for fusion devices like ITER. Simultaneous use of Be, W and C as the wall material for different parts of plasmafacing components (PFCs) will bring in material mixing issues, which compound that of hydrogen isotopes retention. To simulate the hydrogen inventory in the PFCs, we have developed a flexible standalone model called HIIPC (Hydrogen Isotope Inventory Processes Code). The particle balance based model for reaction-diffusion and HII in metal and porous media (mainly carbon and co-deposited layer) is presented, coupled with a heating model which can calculate the temperature distribution. Some sample results are given to illustrate the model's capabilities and show good qualitative agreement with experiment.

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“…In the present work a porous graphite structure [8,15] is created and the effect of hydrogen isotope mixing during the simultaneous bombardment of H and D ion beams having overlapping and non-overlapping profiles is studied.…”

Section: Experimental Observations By Chiu Et Almentioning

confidence: 99%

Modeling of hydrogen isotope exchange from porous graphite

Rai

Schneider

Mutzke

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

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A 3D Kinetic Monte Carlo (KMC) model has been used to study the hydrogen isotope exchange from porous graphite at a single granule length scale (micrometers).The present KMC model is part of a previously reported multi-scale model developed by the authors [1]. SDTrimSP [2,3] simulations have been carried out and the results have been used to get some of the input parameters for the KMC where the diffusive-reactive aspect of H and D are studied. These SDTrimSP calculations show that the incident energetic ion beams lead to the development of inter-connected pores in the graphite sample. In the presence of these connected pores hydrogen molecule formation is not a local process. It takes place throughout the implantation zone and not only at the end of the ion range. For samples having less internal porosity mixing is very low. Therefore the internal structure of graphite, which affects the diffusion coefficient [4][5][6][7] and consequently molecule formation and atomic re-emission [8,9], plays the most crucial role for the H,D mixing. A new mechanism based on the KMC and SDTrimSP simulation is proposed to explain the experimental data.

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Effect of the porous structure of graphite on atomic hydrogen diffusion and inventory

Cited by 15 publications

References 22 publications

Confident methods for the evaluation of the hydrogen content in nanoporous carbon microfibers

Confident methods for the evaluation of the hydrogen content in nanoporous carbon microfibers

Modelling of hydrogen isotope inventory in mixed materials including porous deposited layers in fusion devices

Modeling of hydrogen isotope exchange from porous graphite

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