Calculations - Micromeritics ASAP 2020 Confirm Operator's Manual

ASAP 2020 Confirm
c. The walls of the cylindrical pore - the diameter of the empty pore is required to
determine the pore volume and pore area. End area is neglected.

Calculations

The volumes adsorbed (Va) are converted to the liquid equivalent volumes (V1, cm
VI
I
where D is the Density Conversion Factor from the Adsorptive Properties dialog box.
The relative pressure (Pr
the sample are filled.
The corresponding Kelvin core radius is calculated. Only pores smaller than this size will be
included:
Rc
I
where
A
F
This radius will be adjusted for the thickness of the adsorbed layer during subsequent calcu-
lation steps.
C-14
Insignificant
compared to
core length
  D  
= Va
I
) is assumed to be close to unity so that substantially all the pores in
1
– A
---------------------------------------- -
=
     
1 + F ln Pr
I
= adsorbate property factor (the BJH Adsorptive Options dialog box)
= fraction of pores open at both ends (from the BJH Adsorption Report
Options dialog box or the BJH Desorption Report Options dialog
box); assumed to be zero for desorption
pore
a
d
s
o
r c
b o
wall
e r
e
d
l
a
y
e
r
Appendix C
3
/g):
202-42811-01 - Mar 2011