ISO 9277:2010
Determination of the specific surface area of solids by gas adsorption — BET method
ISO 9277:2010 specifies the determination of the overall specific external and internal surface area of disperse (e.g. nano-powders) or porous solids by measuring the amount of physically adsorbed gas according to the Brunauer, Emmett and Teller (BET) method. It takes account of the International Union for Pure and Applied Chemistry (IUPAC) recommendations of 1984 and 1994.
The BET method is applicable only to adsorption isotherms of type II (disperse, nonporous or macroporous solids) and type IV (mesoporous solids, pore diameter between 2 nm and 50 nm). Inaccessible pores are not detected. The BET method cannot reliably be applied to solids which absorb the measuring gas.
A strategy for specific surface area determination of microporous materials (type I isotherms) is described in an annex.
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Scope
Normative references
Terms and definitions
Symbols and abbreviated terms
Principle
Procedure
Sample preparation
Experimental conditions
Measuring methods for the assessment of the amount of adsorb
Static volumetric method
Flow volumetric method
Gravimetric method
Carrier gas method
Evaluation of adsorption data
General
Multipoint determination
Single-point determination
Test report
Use of reference materials
Previous versions
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Scope
Normative references
Terms and definitions
Symbols and abbreviated terms
Principle
Procedure
Sample preparation
Experimental conditions
Measuring methods for the assessment of the amount of adsorb
Static volumetric method
Flow volumetric method
Gravimetric method
Carrier gas method
Evaluation of adsorption data
General
Multipoint determination
Single-point determination
Test report
Use of reference materials