Skip to main content

ISO 15901-2:2022

Current Date published:

Pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption — Part 2: Analysis of nanopores by gas adsorption

This document describes a method for the evaluation of porosity and pore size distribution by physical adsorption (or physisorption). The method is limited to the determination of the quantity of a gas adsorbed per unit mass of sample as a function of pressure at a controlled, constant temperature[1]-[9]. Commonly used adsorptive gases for physical adsorption characterization include nitrogen, argon, krypton at the temperatures of liquid nitrogen and argon (77 K and 87 K respectively) as well as CO2 (at 273 K). Traditionally, nitrogen and argon adsorption at 77 K and 87 K, respectively, allows one to assess pores in the approximate range of widths 0,45 nm to 50 nm, although improvements in temperature control and pressure measurement allow larger pore widths to be evaluated. CO2 adsorption at 273 K – 293 K can be applied for the microporous carbon materials exhibiting ultramicropores. Krypton adsorption at 77 K and 87 K is used to determine the surface area or porosity of materials with small surface area or for the analysis of thin porous films.

The method described is suitable for a wide range of porous materials. This document focuses on the determination of pore size distribution from as low as 0,4 nm up to approximately 100 nm. The determination of surface area is described in ISO 9277. The procedures which have been devised for the determination of the amount of gas adsorbed may be divided into two groups:

—    those which depend on the measurement of the amount of gas removed from the gas phase, i.e. manometric (volumetric) methods;

—    those which involve the measurement of the uptake of the gas by the adsorbent (i.e. direct determination of increase in mass by gravimetric methods).

In practice, static or dynamic techniques can be used to determine the amount of gas adsorbed. However, the static manometric method is generally considered the most suitable technique for undertaking physisorption measurements with nitrogen, argon and krypton at cryogenic temperatures (i.e. 77 K and 87 K, the boiling temperature of nitrogen and argon, respectively) with the goal of obtaining pore volume and pore size information. This document focuses only on the application of the manometric method.

Get this standard Prices exclude GST
PDF ( Single user document)
$217.08 NZD
HardCopy
$217.08 NZD
Networkable PDF
Price varies
Preview only close
Prev {{ page }}/ {{ numPages }} Next
Preview only close
Prev {{ page }}/ {{ numPages }} Next
Pages: 29

Previous versions

Keep me up-to-date

Sign up to receive updates when there are changes to this standard

Related Information

Similar Standards

  • BS 1796-1:1989

    Test sieving, Methods using test sieves of woven wire cloth and perforated metal plate

  • BS 3406-1:1986

    Methods for determination of particle size distribution, Guide to powder sampling

  • BS 3406-4:1993

    Methods for determination of particle size distribution, Guide to microscope and image analysis methods

  • BS 3625:1963

    Specification for eyepiece and screen graticules for the determination of the particle size of powders

Preview only close
Prev {{ page }}/ {{ numPages }} Next
Preview only close
Prev {{ page }}/ {{ numPages }} Next
Pages: 29

Previous versions

ISO 15901-2:2022

Get this standard Prices exclude GST
PDF ( Single user document)
$217.08 NZD
HardCopy
$217.08 NZD
Networkable PDF
Price varies

Request to add this standard to your subscription

ISO 15901-2:2022

Price varies
Online library subscription

Click "Send request for subscription" to request for your Account Administrator to add this standard to your subscripiton.

Cancel