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Micropore Analysis by Physisorption
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MCA Services offers dedicated micropore analysis using a Micromeritics ASAP 2020 gas porosimeter, capable of obtaining adsorption, physisorption, data at ultra-low partial pressures. Analysis of the isotherm may be confined to the micropore range of pressures or extended to measure a full isotherm thus providing micropore and mesopore data. Micropore reports detail both micropore volume and area together with the surface area of the material. A
wealth of information can be derived from micropore analysis and
specialist analyses can be undertaken through the application of a range
of the following adsorptive gases.
The
ASAP 2020 micropore physisorption instrument extends the range of pore sizes
analysed down to approximately 0.35 nm diameter. The common data reduction
techniques listed below are available for the generation of micropore
volume and micropore area reports and the most appropriate may be selected
according the specific material being analysed and its application.
Micropore Size Distribution using the Horvath-Kawazoe Analysis The combination of the
adsorptive used and reporting options selected, allow analyses to be
tailored to the most specialised of applications. For example, the Saito
Foley cylindrical pore volume can be generated from Horvath Kawazoe data,
which is particularly suited to zeolite and MOF (metal organic framework)
materials. Of particular interest to hydrogen storage / fuel cell
materials is the generation of pressure composition isotherms showing
hydrogen adsorption capacity. Should a full isotherm be measured, mesopore data (pore volume and pore area) is most commonly generated by the BJH (Barrett, Joyner, Halenda) technique. However, DFT (Density Functional Theory) may also be applied which has the benefit of generating pore area and pore volume data continuously throughout the micropore and mesopore range.
Pore size against area distribution by DFT analysis Physisorption using the ASAP 2020 combined with the powerful data reduction software, provides an enormous amount of data. The MCA staff will be happy to discuss particular requirements and provide sample reports pertinent to individual applications.
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