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C H A P T E R 5
Instrument
First
character
Mastersizer X
2
Mastersizer S
3
P a g e 5 . 4
G
e
t
t
i
n
g
S
t
a
r
chosen to give the widest choice of popular values. There are many reference
books available that state the refractive indices of materials.
Relative
Second
particle
character
refractive
index (real)
0.5
A
0.75
B
1.001
C
1.002
D
1.003
E
1.005
F
1.007
G
1.01
H
1.015
I
1.02
J
1.03
K
1.045
L
1.065
M
1.095
N
1.15
O
1.2
P
1.3
Q
1.45
R
1.65
S
1.95
T
2.35
U
3
V
The third character represents the imaginary refractive index of the sample, (this
is effectively its absorption). If the particle has an imaginary refractive index of
0.003 then the third character will be E, if it has a value of 0.1 then the third
character will be H etc. Choosing the value for the imaginary refractive index can
be difficult as the value has to be calculated by performing an experiment.
t
e
d
Relative
Third
refractive
character
index
(imaginary)
0
A
0.0001
B
0.0003
C
0.001
D
0.003
E
0.01
F
0.03
G
0.1
H
0.3
I
1
J
3
K
Dispersant
Fourth
refractive
characte
index
r
1
A
1.2
B
1.3
C
1.33
D
1.4
E
1.5
F
1.6
G
1.7
H
M A N
0 1 0 1
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