Pore Structure

Dullien, F. A. L.

doi:10.1016/b978-0-12-223650-1.50008-5

Cited by 294 publications

(196 citation statements)

References 62 publications

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“…The capillary pressure presents the static force between the non-wetting phase and wetting phase in the porous media and it is an increasing function of the nonwetting phase saturation [29,30].…”

Section: Di-electrical Measurementsmentioning

confidence: 99%

Characterization of Fontainebleau Sandstone: Quartz Overgrowth and its Impact on Pore-Throat Framework

Saadi¹,

Wolf²,

Kruijsdijk³

2017

J Pet Environ Biotechnol

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Section: Di-electrical Measurementsmentioning

confidence: 99%

Characterization of Fontainebleau Sandstone: Quartz Overgrowth and its Impact on Pore-Throat Framework

Saadi¹,

Wolf²,

Kruijsdijk³

2017

J Pet Environ Biotechnol

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“…In a porous material, the molecules are restricted to evolving in the accessible volume: the mean square displacement remains proportional to time, but with an effective diffusion coefficient which is smaller than in bulk. This is because the molecules have to travel a larger distance through tortuous channels [1,2,20].…”

Section: Diffusion Measurementsmentioning

confidence: 99%

“…Both are influenced by the structure and topology of the porous material, as well as the interactions between the fluid molecules and the solid surface. It is important to note that self-diffusion and convection are quite different processes which are not sensitive to the same morphological and topological characteristics of the porous medium [1,2].…”

Section: Introductionmentioning

confidence: 99%

Structure and Permeability of Porous Silicon Investigated by Self-Diffusion NMR Measurements of Ethanol and Heptane

Puibasset

Porion

Grosman

et al. 2016

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-The adsorption and phase transitions of confined fluids in nanoporous materials have been studied intensely because of both their fundamental interest and their crucial role in many technologies. Questions relating to the influence of the confinement of fluids, and the disorder or elastic deformation of porous solids on the liquid-gas phase transition are still under debate. Model systems are needed to understand the adsorption phenomenon. In this context, Porous Silicon (PoSi), which is a single crystal obtained by etching a (100) silicon wafer is an excellent candidate. Indeed, it consists of non-connected tubular pores running parallel to the [100] axis perpendicular to the wafer surface, with transverse sections with a polygonal shape of nanometric size whose areas are widely distributed. Once detached from the wafer, free PoSi membranes can be considered a nanoscale disordered honeycomb. Adsorption/desorption experiments have been performed to characterize the structure: they have shown that evaporation occurs collectively, an intriguing observation generally associated with a disordered pore structure with many interconnections through narrow necks. The characterization of fluid mobility inside the pores should give complementary information about the pore structure and topology. This paper focuses on the dynamics of a fluid confined inside the structure of porous silicon, and in particular the self-diffusion measurements (pulsed field gradient spin echo Nuclear Magnetic Resonance (NMR)). The results show a strong anisotropy of the selfdiffusion tensor, as expected in this highly anisotropic structure. However, a non-zero self-diffusion in the directions perpendicular to the pore axis is observed. In order to interpret these puzzling results, molecular and Brownian dynamics calculations are underway.Résumé -Structure et perméabilité du silicium poreux : étude de l'autodiffusion de l'éthanol et de l'heptane par RMN -L'adsorption et les transitions de phase de fluides confinés dans des nanopores sont étudiées pour leur intérêt fondamental et technologique. En particulier, l'influence du confinement du fluide, du désordre ou des déformations élastiques du milieu poreux sur la transition liquide-vapeur sont toujours débattus. Des systèmes modèles sont requis pour mieux comprendre ces phénomènes en lien avec l'adsorption. Dans ce contexte, le silicium poreux obtenu par attaque chimique de la surface (100) d'un wafer de silicium parait être un excellent candidat. Il est en effet constitué de pores tubulaires non-connectés et parallèles à l'axe [100] perpendiculaire à la surface du wafer ; ces pores sont à section polygonale de taille nanométrique, avec une distribution en taille large. La membrane de silicium poreux, une fois détachée du wafer peut être vue comme une structure en nid d'abeilles désordonné. Des mesures d'isothermes d'adsorption/désorption ont été réalisées pour caractériser la structure : elles ont montré que l'évaporation a lieu de manière collective, une observation inattendue, généra...

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“…The validity of the results were made confirmed by comparing the interfacial area at Str=0 with that of solid surface area. The specific solid surface area was calculated for each porous media assuming that all particles are perfectly spheres and identical in size (Dullien, 1979) and the interfacial area at zero saturation was taken from Fig. 8 by extrapolating the experimental data.…”

Section: Evaluation Of Air-liquid Interfacial Areamentioning

confidence: 99%

Volatilization of Non-Aqueous Phase Liquid in Porous Media: Vapor Phase Mass Transfer Characteristics

Anwar

Matsubayashi

2000

Journal of Groundwater Hydrology

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Pore Structure

Cited by 294 publications

References 62 publications

Characterization of Fontainebleau Sandstone: Quartz Overgrowth and its Impact on Pore-Throat Framework

Characterization of Fontainebleau Sandstone: Quartz Overgrowth and its Impact on Pore-Throat Framework

Structure and Permeability of Porous Silicon Investigated by Self-Diffusion NMR Measurements of Ethanol and Heptane

Volatilization of Non-Aqueous Phase Liquid in Porous Media: Vapor Phase Mass Transfer Characteristics

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