Cylinder Pore Geometry (Saito/Foley - Micromeritics ASAP 2020 Confirm Operator's Manual

Appendix C
d
0
L
P
Po
IP

Cylinder Pore Geometry (Saito/Foley)

When you use the Saito-Foley
The value of L is determined when the solved-for relative pressure is within 0.1% of the col-
lected absolute pressure.
P
 
------ -
ln =
 
Po
where
K
R
T
L
P
Po
IP
d
0
1. Saito, A. and Foley, H.C., AlChE Journal 37(3), 429 (1991).
202-42811-01 - Mar 2011
A  
D + D
A S
----------------------------- -
=
2
where:
D = molecular diameter (Å) from the Horvath-Kawazoe Physical
A
Properties dialog
D = diameter of sample atom (Å) from the Horvath-Kawazoe Physical
S
dialog
= pore width (nucleus to nucleus) (Å)
= equilibrium pressure (mmHg)
= saturation pressure (mmHg)
= interaction parameter (10
Report Options dialog
1 method, the following equation is solved for each value of P.
32 4
K 
3 IP 10 JA /J cm

-- - ------ - ------------------------------------------------- -
4 RT
4
d
0
= Avogadro's number (6.023 x 10
= gas constant (8.31441 x 10
= analysis bath temperature (K), from an entered or calculated
value on the Po and Temperature Options dialog
= pore width (nucleus to nucleus) (Å)
= equilibrium pressure (mmHg)
= saturation pressure (mmHg)
= interaction parameter (10
Report Options dialog
A  
D + D
A S
--------------------------- -
=
2
where:
D = molecular diameter (Å) from the Horvath-Kawazoe Physical
A
Properties dialog
D = diameter of sample atom (Å) from the Horvath-Kawazoe Physical
S
dialog
-43 4
ergs-cm ) from the Horvath-Kawazoe

4
d 2k
1
 
 0

----------- - 1 ---- -
–
 
k + 1 r
p
k = 0
23 )
7
ergs/mole K)
-43 4
ergs-cm ) from the Horvath-Kawazoe
ASAP 2020 Confirm

d 10 d
21
   
0 0
 ----- -  
---- - ---- -
–

   
k k
32 r r

p p

4


C-23