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• W15491331 abstract "In any application of porous materials, one is always concerned about the pore size and the hydraulic permeability of the material. The former determines the amount of internal surface area and the latter controls how easy fluids can access these pores. These two properties are closely related because the smaller the pores are, the harder it is for fluids to flow through the material. In catalytic materials, it is desirable to have small pores to increase the amount of surface area, but they must not be too small to let the reactants flow. Without some quantitative knowledge of how the pore size affects the permeability, it would be difficult to achieve an optimal compromise between the two competing factors. However, defining the meaning of pore size precisely and relating it to the permeability is nontrivial. The term pore size is commonly used in the study of porous media without a clear definition, because in most materials the pores have irregular shapes with features sizes that span a wide range of length scales. In the petroleum industry where one is concerned with the flow of hydrocarbons through the pores of sedimentary rock, studies have shown that the pores have features ranging from below one nanometer to tens of micrometers. Many experiments indicate that the pore surface in sedimentary rock exhibits the scale invariant behavior of fractals.1,2 For many of the catalytic materials described in this volume, the pore sizes are quite uniform and fall in the 1–10 nm range. However, the materials are made in the form of small particles and the inter-particle pores are irregular in shape and much larger in size, not very different from the ones in rock. For the reacting fluids to access the nanopores inside the particles, they have to flow through the macropores between the particles. In such systems with irregularly shaped pores or two distinct classes of pores, how can one define a unique pore size that governs the flow properties? This is the basic question we try to address in this article. Over the last decade, much effort has been directed towards a better quantification of the microgeometry of porous media and understanding how it affects the permeability.3 Many of these studies were carried out for sedimentary rock because the rock" @default.
• W15491331 created "2016-06-24" @default.
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• W15491331 date "2006-02-24" @default.
• W15491331 modified "2023-09-26" @default.
• W15491331 title "Pore Size, Permeability and Electrokinetic Phenomena" @default.
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• W15491331 doi "https://doi.org/10.1007/0-306-47066-7_19" @default.
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