T-Plot - Micromeritics ASAP 2460 Operator's Manual

Appendix C

t-Plot

A least-squares analysis fit is performed on the (t
and N is the dependent variable. Only the values of t
ads,i
imum thickness, are used. The following are calculated:
a.) Slope (S cm
b.) Y-intercept (Y
c.) Error of the slope (S
d.) Error of the Y-intercept (YI
e.) Correlation coefficient
Using the results of the above calculations, the following can be calculated:
External Surface Area (m
SV
mol
---------------------------------------------

F 22414
cm
where
4
10 =
F =
V =
mol
Micropore Surface Area (m
SA = SA
p
where SA is the BET surface area if the user enabled the BET report exclusively, or Langmuir sur-
total
face area if the user enabled the Langmuir report exclusively. If neither report has been selected, SA
is the BET surface area value calculated using a set of default parameters.
Micropore Volume (cm
Y V
int mol
----------------------------------- -
3
22414
cm
C-12
3
/g-Å STP)
3
cm /g STP)
int
3
cm /g-Å STP)
err
3
cm /g STP)
err
2
/g):
4

10
3
STP
unit conversions
surface area correction factor, user-entered on the t-Plot Report Options
window
liquid molar volume, from the fluid property information
2
/g):
+ SA
total ext
3
liquid/g):
STP
, N ) data pairs where t
i ads,
i
between t and t
i min
ASAP 2460 Operator's Manual
is the independent variable
i
, the minimum and max-
max
246-42800-01 - Aug 2013
total