Micromeritics ASAP 2020 Confirm Operator's Manual page 420

Appendix F
The surface energy is reported in terms of the effective Lennard-Jones interaction parameter,
e, for the adsorptive/adsorbent pair divided by Boltzmann's constant. The units are therefore
Kelvins.
N2 - Cylindrical Pores - Oxide Surface
AR - Cylindrical Pores - Oxide Surface
Geometry:
Substrate:
Category:
Method:
Model isotherms were calculated using a combination of statistical mechanical calculations
and experimental observations for macroporous silicas and MCM-41 mesoporous silicas as
well as zeolites. The pore-filling pressures were determined as a function of the pore size
from adsorption isotherms on MCM-41 materials characterized by X-ray and other tech-
niques. The variation of the pore fluid density with pressure and pore size has been accounted
for by density functional theory calculations. The N2 model reports pore sizes ranging from
3.8 to 387 angstroms and the AR model from 3.8 to over 500 angstroms.
Reference:
N2 – Cylindrical Pores – Pillared Clay Surface (Montmorillionite)
Geometry:
Substrate:
Category:
Method:
Model isotherms were calculated using a combination of statistical thermodynamic Non-
Local Density Functional Theory (NLDFT) calculations and experimental isotherms for ref-
erence samples of montmorillionite.The construction method for the hybrid models was
analogous to that described in the first reference below (Jaroniec et al,1999). The additional
references add additional theoretical details as well as examples of the application of the
model to pillared clay catalysts.This model reports pore widths from 3.8 to 387 angstroms.
F-8
Cylinder
Oxide
Porosity
Nitrogen at 77 K; Argon at 87 K
M. Jaroniec, M. Kruk, J.P. Olivier, and S. Koch, "A New Method for the
Accurate Pore Size Analysis of MCM-41 and Other Silica-Based Mesoporous
Materials," Proceedings of COPS-V, Heidelberg, Germany (1999)
Cylinder
Crystalline Silicate
Porosity
Nitrogen at 77 K
ASAP 2020 Confirm
202-42811-01 - Mar 2011