A porous
carbon material, usually a
char or
carbon fibres, which may
or may not have been subjected to an
activation process to increase
its
adsorptive properties. A microporous carbon is considered to
have a major part of its
porosity in pores of less than
width and
to exhibit apparent surface areas usually higher than
to
.
Note:
The surface areas determined by the
Brunauer–Emmett–Teller (BET) method are apparent surface areas
only since the
BET
adsorption equation is, in principle, not valid
when micropore filling occurs. The determination of the true surface
area in the micropores depends on the method used for the evaluation
of the adsorption isotherms and on the model used for the shape of the
micropores (cylindrical, slit-shaped or other).
Source:
PAC, 1995, 67, 473
(Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995))
on page 497
See also:
PAC, 1972,
31, 518
