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  • Single-point and Multi-point BET Theories

    [Surface Area] Single-point and Multi-point BET Theories

    2021-11-25

    4630

    Basic and simple introduction of the single-point BET, multi-point BET and the differences between of them.

  • BET Theory, Equation and Relation with Langmuir Theory

    [Surface Area] BET Theory, Equation and Relation with Langmuir Theory

    2021-11-02

    2142

    The BET theory introduction and its plot meaning, also with the BET test steps. The BET is an extension of Langmuir surface area and the limitations.

  • Adsorption Hysteresis

    [Porosity] Adsorption Hysteresis

    2022-11-14

    1581

    It is widely accepted that there is a correlation between the shape of the hysteresis loop and the texture (e.g., pore size distribution, pore geometry, connectivity) of a mesoporous adsorbent. An empirical classification of hysteresis loops was given by the IUPAC, which is based on an earlier classification by de Boer.

  • Classification of Adsorption Isotherms

    [Porosity] Classification of Adsorption Isotherms

    2022-09-20

    966

    Based upon an extensive literature survey, performed by Brunauer, Demming, Demming and Teller (BDDT), the IUPAC published in 1985 a classification of six sorption isotherms.

  • Pore Size and Adsorption Potential

    [Porosity] Pore Size and Adsorption Potential

    2022-09-16

    856

    The shape of sorption isotherms of pure fluids on planar surfaces and porous materials depends on the interplay between the strength of fluid-wall and fluid-fluid interactions as well as the effects of confined pore space on the state and thermodynamic stability of fluids confined to narrow pores.

  • Physical and Chemical Adsorption

    [Porosity] Physical and Chemical Adsorption

    2022-09-13

    856

    Depending upon the strength of the interaction, all adsorption processes can be divided into the two categories of chemical and physical adsorption.

  • The Frenkel-Halsey-Hill (FHH) Theory of Multilayer Adsorption

    [Surface Area] The Frenkel-Halsey-Hill (FHH) Theory of Multilayer Adsorption

    2022-10-26

    852

    Physisorption at temperatures below the critical temperature Tc and in the complete wetting regime leads to the development of multilayer adsorption by approaching the saturation pressure Po. The BET theory describes adsorption of the first two or three layers in a satisfying way, but fails to assess correctly the range of the adsorption isotherm, which is associated with the development of thick multilayer films.

  • Surface Area from Particle Size Distributions

    [Surface Area] Surface Area from Particle Size Distributions

    2022-09-08

    745

    Although particles can assume all regular geometric shapes, and in most instances highly irregular shapes, most particle size measurements are based on the so-called ‘equivalent spherical diameter’.

  • Gas Adsorption Introduction

    [Porosity] Gas Adsorption Introduction

    2022-09-07

    726

    Gas adsorption is one of many experimental methods available for the surface and pore size characterization of porous materials.

  • The Langmuir Isotherm

    [Surface Area] The Langmuir Isotherm

    2022-09-23

    721

    The success of kinetic theories directed toward the measurements of surface areas depends upon their ability to predict the number of adsorbate molecules required to cover the solid with a single molecular layer.

  • The Brunauer, Emmett and Teller (BET) Theory Equation

    [Surface Area] The Brunauer, Emmett and Teller (BET) Theory Equation

    2022-10-18

    719

    During the process of physical adsorption, at very low relative pressure, the first sites to be covered are the more energetic ones. Those sites with higher energy on a chemically pure surface reside within narrow pores where the pore walls provide overlapping potentials.

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