Micromeritics Gemini VII 2390a, Operator'S Manual

Page: 325 / 426

D
MEAN
2
10
3
nm
3
/A
3

E

0
-----------------------------
1/3

3
N
1 +
3
N
----------------
 
 
----------------------------------------- 
=
SDA
1000 2.0
W
0
 
E
0
k
------
1/3
 
3
N
1 +
3
N
----------------
 
 

=
Gemini VII Appendix C
239-42828-01 - Dec 2012 C-31
Maximum Differential Pore Volume (cm
3
/g-Å):
This value is also known as
frequency of the mode
12
Mean Equivalent Pore Width (Å):
Micropore surface area (m
2
/g):

is calculated by a polynomial approximation over the domain 0

x

1 as follows:

(x+1) = 1+b
1
x + b
2
x
2
+ b
3
x
3
+ b
4
x
4
+ b
5
x
5
+ b
6
x
6
+ b
7
x
7
+ b
8
x
8
+

(x) |

(x) |

3 x 10
-7
x
1 +
3
N
1 +
3
N
----------------
 
 
=
where
b
1
= -0.57719 1652
b
2
= 0.98820 5891
b
3
= -0.89705 6937
b
4
= 0.91820 6857
b
5
= -0.75670 4078
b
6
= 0.48219 9394
b
7
= -0.19352 7818
b
8
= 0.03586 8343
and where
dV
dD
mode
-------------------
Max
0.5 3
N
1 +
  
W
o

3
N
1 +
3
N
----------------
1/3N


E

0
10
3
nm
3
/A
3
----------------------------- 
1/3
3
N
1 +
3
N
----------------
–
 
 
exp

=