Biomedical Engineering Reference
In-Depth Information
(
a
)
O
O
C
12
H
25
C
12
H
25
C
12
H
25
C
12
H
25
N
N
C
12
H
25
O
C
12
H
25
O
(
b
)
C
60
Figure 9.9
(a) Molecular structure of perylene-3,4,9,10-tetracarboxylic acid diimide
(PDI12). (b) Schematic illustration of double-layer preparation between PDI12 columns
and C
60
fullerenes. (Redrawn from Tolkki
et al.
[66].)
and, therefore, they would be an ideal substitute in the next generation
twisted nematic displays. Moreover, larger viewing angle display device
may come by combination of O- and E- type chromonic polarizers. In the
long term, a detailed understanding of the structure-property relationship
of chromonic aggregates is required with respect to the nature of aromatic
core, choice of solvents, counter ions, dopants, temperature, etc., for fur-
ther new developments. In short, because of the high level of molecular
organization and a wide range of physical properties inherent in chro-
monic systems, they could be exploited in the near future for real practical
applications.
9.3
Part II: h
ermotropic Ionic Discotic Liquid
Crystals
h ere has been an ever-increasing interest in the i eld of DLCs ever since
their discovery [68]. Discotic liquid crystals are a unique state of matter
possessing self-organization of disk-shaped molecules. h eir supramo-
lecular columnar architecture is of fundamental importance, not only
as models for the study of the energy and charge migration in organized
