Micromeritics Gemini VII 2390a, Руководство оператора

Страница: 305 / 426

Gemini VII Appendix C
239-42828-01 - Dec 2012 C-11
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
VI
I
Va
I
 
D
 
=
Rc
I
A
–
1
F
+
 
Pr
I
 
ln
 
-----------------------------------------
=
The volumes adsorbed (Va) are converted to the liquid equivalent volumes (V1, cm
3
/g):
where D is the Density Conversion Factor from the Adsorptive Properties dialog.
The relative pressure (Pr
1
) is assumed to be close to unity so that substantially all the pores in the sam-
ple are filled.
The corresponding Kelvin core radius is calculated. Only pores smaller than this size will be included:
where
A = adsorbate property factor (the BJH Adsorptive Options dialog)
F = fraction of pores open at both ends (from the BJH Adsorption Report Options
dialog or the BJH Desorption Report Options dialog); assumed to be zero for
desorption
This radius will be adjusted for the thickness of the adsorbed layer during subsequent calculation steps.
Pore
Insignificant
compared to
core length
Wall