Micromeritics ASAP 2460, Operator'S Manual

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ASAP 2460 Operator’s Manual Appendix C
246-42800-01 - Aug 2013 C-27
IP = interaction parameter (erg-cm
4
) from the
Horvath-Kawazoe Report Options
window
K = Avogadro’s number (6.023 × 10
23
mol
-1
)
L = pore width (nucleus to nucleus) (Å)
P = equilibrium pressure
Po = saturation pressure
R = gas constant (8.31441 × 10
7
erg/mol K )
T = analysis bath temperature ( K ), from an entered or calculated value on the
Po
and Temperature Options
window
where:
Z
S
= sample equilibrium diameter at zero interaction energy (Å) from the
Horvath-Kawazoe Physical Properties
window
Z
A
= zero interaction energy diameter from the
Horvath-Kawazoe Physical
Properties
window
Cylinder Pore Geometry (Saito/Foley)
When you use the Saito-Foley
10
method, the following equation is solved for each value of P . The
value of L is determined when the solved-for relative pressure is within 0.1% of the collected absolute
pressure.
where
10
32
= the number of cm
4
that are equal to Å
4

k
=

k
=
d
0
=
where:
D
A
= molecular diameter (Å) from the
Horvath-Kawazoe Physical Proper-
ties
window
D
S
= diameter of sample atom (Å) from the
Horvath-Kawazoe Physical
Properties
window
IP = interaction parameter (10
-43
erg-cm
4
) from the
Horvath-Kawazoe Report
Options
window
K = Avogadro’s number (6.023 × 10
23
)
L = pore width (nucleus to nucleus) (Å)
P
Po
-------
 
 
ln
3
4
---

K
RT
-------
IP 10
32 
d
0
4
----------------------- 
1
k 1 +
------------ 1
d
0
r
p
----
–
 
 
2 k
21
32
------ 
k
d
0
r
p
----
 
 
10

k
d
0
r
p
----
 
 
4
–
 
 
 

k 0 =



=
1.5 – k –
k
--------------------
 
 
2

k 1 –
,

0
1.0 =
4.5 – k –
k
--------------------
 
 
2

k 1 –
,

0
1.0 =
D
A
D
S
+
2
---------------------