Langmuir Surface Area - Micromeritics TriStar II 3020 Operator's Manual

TriStar II 3020

Langmuir Surface Area

For each point designated for surface area calculations, the Langmuir
follows:
P
rel
----------- -
=
I
L
I
N
ads
I
where L is in units of g/cm
I
A least-squares fit is performed on the (P
able and L is the dependent variable. The following are calculated:
I
a.) Slope (S g/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:
Langmuir Surface Area (m
------------------------------------------------------------------------------------------------- -
=
SA
LAN

22414 cm
where
CSA =
Volume of the Monolayer (cm
1
-- -
=
V
M
S
Langmuir b Value:
  V 
=
b Y
INT
Error of the Langmuir Surface Area (m
SA
---------------------------------- -
=
LAN
ERR
302-42828-01 - Dec 2012
3
STP
I , L
rel
3
STP)
3
g/cm STP)
INT
3
g/cm STP)
ERR
g/cm
ERR
2
/g):
23
   
6.023 10
CSA
3 18 2
  
10 /m
STP nm
analysis gas molecular cross-sectional area (nm
tive Properties dialog
3
/g STP):

M
2
/g):

S
LAN ERR
S
3
) designated pairs where P
I
3
STP)
2
 
S
Appendix C
transformation is calculated as
I is the independent vari-
rel
2
), user-entered on the Adsorp-
C-7