Dubinin-Astakhov - Micromeritics ASAP 2460 Operator's Manual

Appendix C
Error of Monolayer Capacity (cm
Q = Q

0 err
Micropore surface area (m
--------------------------------------------------------
SDP =
22414 cm
where

=

Dubinin-Astakhov

The Dubinin-Astakhov equation is:
 
log Q =
where

=
E =
0
N =
P =
Po =
Q =
Q =
0
R =
T =
C-38
3
/g STP):

YI err
 
10 – 1.0
0
2
/g):
23
Q   
6.023 10
0
18 2
 
10 nm
3
 ---------------------- - 
2
 
m
molecular cross sectional area of gas (nm
window
N
RT
  
-------- -
log Q –
0
E
0
the affinity coefficient of the analysis gas relative to the Po gas, from the
Dubinin Adsorptive Options window
characteristic energy (kj/mol)
Astakhov exponent, may be optimized or user entered from the Dubinin
Report Options window
equilibrium pressure
saturation vapor pressure of gas at temperature T
quantity adsorbed at equilibrium pressure (cm
the micropore capacity (cm
the gas constant (0.0083144 kj/mol)
analysis bath temperature (K)
2
) from the Adsorptive Properties
N
Po
log ------ -
P
3
/g STP)
ASAP 2460 Operator's Manual
3
/g STP)
246-42800-01 - Aug 2013