Micromeritics TriStar II 3020 - Additional Calculations

AL
I
L
I
DS–=
Appendix C TriStar II 3020
C-24 302-42828-01 - Dec 2012
Additional Calculations
Based on the previous calculations, the following can be calculated:
Adjusted Pore Width (Å):
(Shell to Shell)
Cumulative Pore Volume (cm
3
/g):
V
CUM
I
V
I
D=
dV
dD
I
---------
V
CUM
I
V
CUM
I 1–
–
AL
I
AL
I 1–
–
-------------------------------------------
=
where
D = density conversion factor (cm
3
liquid/cm
3
STP) on the Adsorptive Properties
dialog
dV/dD Pore Volume (cm
3
/g-Å):
Median Pore Width (Å):
V
HALF
V
CUM
N
2
-----------------
=
D
MED
10 D
L
log V
HALF
V
L
log–log
D
G
 D
L
log–log
V
G
 V
L
log–log
-----------------------------------------------
+=
where
V
CUM
N
= total cumulative pore volume (V
CUM
I
) for points designated for Horvath-
Kawazoe calculations
V
HALF
= 50% of total cumulative pore volume
V
L
= cumulative pore volume (V
CUM
I
) for first point less than V
HALF
V
G
= cumulative pore volume (V
CUM
I
) for first point greater than V
HALF
D
L
= pore width (L
I
) that corresponds to V
L
D
G
= pore width (L
I
) that corresponds to V
G