BET
The method of Brunauer, Emmet, and Teller is employed to determine surface area on a model of adsorption which incorporates multilayer coverage.
Application
Uses:
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Application
Uses:
Technical data:
1. PURPOSE
The Micromeritics Tri Star 3000 Surface Area and Porosity Analyzer is used for N2 adsorption measurements.
2. SCOPE
- Calculation of specific surface area from adsorption and desorption isotherm branch according to BET or single point method
- Calculation of pore volume and pore size distribution from adsorption and desorption isotherm branch according to BJH method.
3. TARGET GROUP
Solid state materials, micro-, mesoporous materials
4. DEFINITIONS AND ABBREVIATIONS
Adsorption - adhesion (binding) of a species (adsorptive) to an interface (adsorbent) Desorption – reverse to adsorption process Specific surface area - the accessible internal and external surface to an adsorptive for 1 gram of solid.
Total pore volume – the volume of the accessible pores to an adsorptive for 1 gram of solid Adsorption isotherm – plot of the amount of gas adsorbed vs. pressure (p/po) BET – model developed by Brunauer, Emmett and Teller describing molecular adsorption, can be used to measure (BET) surface area of materials.
BJH - model developed by Barrett, Joyner & Halenda describing molecular adsorption, can be used to calculate pore size distribution of materials.
Single point approach – method for calculation surface area based on the point on isotherm which correspond to the formation of the statistic monolayer on the surface.
3Flex 3500 | |
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Degas Sample Dryer for Tristar 3000 |
Degas Smartprep for 3Flex |
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Before you begin
- Contact equipment responsible : Elin Harboe Albertsen, elin.h.albertsen@ntnu.no
Before you begin
Useful Links
Video:
http://www.youtube.com/watch?v=sqGJsIVCvq8
Poster:
http://www.micromeritics.com/repository/files/gas_adsorption_theory_poster.pdf
User Manual:
http://www.micromeritics.com/repository/files/tristar_3000_operators_manual_v6.08.pdf
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