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272
Ionic strength
I
=
1
2
C
i
z
i
2
i
∑
C
i
:Molar concentration of ionic species (Na
+
, Cl
−
..)
z
i
:Charge of ionic species (-1, +1, -2, +2..)
I = ∞
I = 1
I = 0.11
Sample: 30% hydrolyzed
M
w
= 1·10
7
Da
7
COO
-
CONH
2
CONH
2
COO
-
CONH
2
10
6
10
7
M (Da) M (Da)
R
G
(nm)
I = 0.17 M
R
G
∝
M
0.56
=> Random coil
PAAM: R
G
vs. M (from light scattering)