Interplay of molecular size and pore network geometry on the diffusion of dissolved gases and HTO in Boom Clay

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Interplay of molecular size and pore network geometry on the diffusion of dissolved gases and HTO in Boom Clay. / Jacops, Elke; Aertsens, Marc; Maes, Norbert; Bruggeman, Christophe; Krooss, Bernhard; Amann-Hildenbrand, A.; Swennen, Rudy; Littke, Ralf.

In: Applied Geochemistry, Vol. 76, 01.01.2017, p. 182-195.

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Jacops, Elke ; Aertsens, Marc ; Maes, Norbert ; Bruggeman, Christophe ; Krooss, Bernhard ; Amann-Hildenbrand, A. ; Swennen, Rudy ; Littke, Ralf. / Interplay of molecular size and pore network geometry on the diffusion of dissolved gases and HTO in Boom Clay. In: Applied Geochemistry. 2017 ; Vol. 76. pp. 182-195.

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@article{8f31e4ec1c6341228a62d9e499d7b98b,
title = "Interplay of molecular size and pore network geometry on the diffusion of dissolved gases and HTO in Boom Clay",
abstract = "Through-diffusion experiments in Boom Clay have been performed with uncharged molecules: tritiated water (HTO) and dissolved gases of different size (He, Ne, H2, Ar, CH4, Xe and C2H6), allowing information to be obtained on the relationship between the diffusion coefficient and the molecular size (characterized by a 'kinetic diameter' of the molecules). Experiments have been performed on both clayey and silty Boom Clay samples, to scope for the changes induced by grain size variations on the diffusion process. Experiments on clay cores taken perpendicular as well as parallel to the bedding plane have also been executed, providing additional information on the anistropy of the diffusion process. Empirical relations are proposed to capture the observed decrease of both the diffusion coefficient in water and the effective diffusion coefficient in the Boom Clay porous medium as a function of molecular size. In the same way, the behaviour of the geometric factor G as a function of size is estimated. Although silty samples have a noticeably higher hydraulic conductivity than clayey samples, the difference in diffusion coefficient is less obvious. The anisotropy factor is roughly the same for all investigated components, with an average value of 1.5.",
keywords = "diffusion, gases, HTO",
author = "Elke Jacops and Marc Aertsens and Norbert Maes and Christophe Bruggeman and Bernhard Krooss and A. Amann-Hildenbrand and Rudy Swennen and Ralf Littke",
note = "Score=10",
year = "2017",
month = "1",
day = "1",
doi = "10.1016/j.apgeochem.2016.11.022",
language = "English",
volume = "76",
pages = "182--195",
journal = "Applied Geochemistry",
issn = "0883-2927",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Interplay of molecular size and pore network geometry on the diffusion of dissolved gases and HTO in Boom Clay

AU - Jacops, Elke

AU - Aertsens, Marc

AU - Maes, Norbert

AU - Bruggeman, Christophe

AU - Krooss, Bernhard

AU - Amann-Hildenbrand, A.

AU - Swennen, Rudy

AU - Littke, Ralf

N1 - Score=10

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Through-diffusion experiments in Boom Clay have been performed with uncharged molecules: tritiated water (HTO) and dissolved gases of different size (He, Ne, H2, Ar, CH4, Xe and C2H6), allowing information to be obtained on the relationship between the diffusion coefficient and the molecular size (characterized by a 'kinetic diameter' of the molecules). Experiments have been performed on both clayey and silty Boom Clay samples, to scope for the changes induced by grain size variations on the diffusion process. Experiments on clay cores taken perpendicular as well as parallel to the bedding plane have also been executed, providing additional information on the anistropy of the diffusion process. Empirical relations are proposed to capture the observed decrease of both the diffusion coefficient in water and the effective diffusion coefficient in the Boom Clay porous medium as a function of molecular size. In the same way, the behaviour of the geometric factor G as a function of size is estimated. Although silty samples have a noticeably higher hydraulic conductivity than clayey samples, the difference in diffusion coefficient is less obvious. The anisotropy factor is roughly the same for all investigated components, with an average value of 1.5.

AB - Through-diffusion experiments in Boom Clay have been performed with uncharged molecules: tritiated water (HTO) and dissolved gases of different size (He, Ne, H2, Ar, CH4, Xe and C2H6), allowing information to be obtained on the relationship between the diffusion coefficient and the molecular size (characterized by a 'kinetic diameter' of the molecules). Experiments have been performed on both clayey and silty Boom Clay samples, to scope for the changes induced by grain size variations on the diffusion process. Experiments on clay cores taken perpendicular as well as parallel to the bedding plane have also been executed, providing additional information on the anistropy of the diffusion process. Empirical relations are proposed to capture the observed decrease of both the diffusion coefficient in water and the effective diffusion coefficient in the Boom Clay porous medium as a function of molecular size. In the same way, the behaviour of the geometric factor G as a function of size is estimated. Although silty samples have a noticeably higher hydraulic conductivity than clayey samples, the difference in diffusion coefficient is less obvious. The anisotropy factor is roughly the same for all investigated components, with an average value of 1.5.

KW - diffusion

KW - gases

KW - HTO

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/20765349

U2 - 10.1016/j.apgeochem.2016.11.022

DO - 10.1016/j.apgeochem.2016.11.022

M3 - Article

VL - 76

SP - 182

EP - 195

JO - Applied Geochemistry

JF - Applied Geochemistry

SN - 0883-2927

ER -

ID: 1892391