Micromeritics ASAP 2460, Руководство оператора

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ASAP 2460 Operator’s Manual Appendix C
246-42800-01 - Aug 2013 C-29
T
1
=
T
2
=
T
3
=
T
4
=
where
Cheng/Yang Correction
This factor corrects for the nonlinearity of the isotherm. It adds an additional term to the equations for
the different geometrics:
where
G ( L ) = one of the Horvath-Kawazoe equations given above

= degree of void filling;

is estimated by first computing the monolayer capac-
ity ( Q
m
) with the Langmuir equation over the range of data points from
relative pressure 0.02 to 0.2 or the maximum relative pressure included in the
Horvath-Kawazoe analysis.

is computed as the quantity adsorbed over Q
m
.
1
1 S –
 
3
-------------------
1
1 S +
 
3
-------------------
–
1
1 S +
 
2
-------------------
1
1 S –
 
2
-------------------
–
1
1 S –
 
9
-------------------
1
1 S +
 
9
-------------------
–
1
1 S +
 
8
-------------------
1
1 S –
 
8
-------------------
–
S
L d
0
–
L
--------------
=
P
Po
-------
 
 
ln G L
 
1
1

---
1
1

–
------------
 
 
ln – – =