Biomedical Engineering Reference
In-Depth Information
(
a
)
O
O
N
N
SO
3
-
NH
4
+
+
H
4
N
-
O
3
S
N
N
A
O
O
SO
3
-
NH
4
+
N
N
+
H
4
N
-
O
3
S
N
N
B
(
b
)
(
c
)
Cl
V20
N
Cl
N
PDDA
V20
N
PDDA
N
Cl
Cl
Glass Substrate
Shear Direction
Figure 9.7
Molecular structure of the isomers (a) of V20 (A & B) and (b)
poly(diallyldimethylammonium chloride) (PDDA). (c) Schematic geometrical assembly
of multi-layered structure of PDDA-chromonics. (Redrawn from Schneider and
Lavrentovich
et al
. [45].)
O
O
N
N
SO
3
-
Na
+
+
Na
-
O
3
S
O
O
(
a
)
O
O
N
N
N
O
N
O
SO
3
-
H
3
C
SO
3
-
H
3
C
(
b
)
Figure 9.8
Molecular structures of (a) negatively charged dye Red 2304 and (b) positively
charged dye Red 2316.
