Discotic schematic representation

Figure 8.3 Schematic representation of the molecular arrangement in the nematic discotic (Nq), columnar nematic (Ncoi), columnar hexagonal (Coin), and columnar rentangular (Coir) mesophases. A tablet represents a molecule with disk-like shape.

FIG. 2. Schematic representation of different calamitic and discotic thermotropic liquid crystals (a) nematic, (b) cholesteric, (c-e) smectic, (f) columnar hexagonal, (g) columnar hexagonal tilted a-e adapted from Demus, D., and Richter, L., Textures of Liquid Crystals, Verlag Chemie, Weinheim, Germany, 1978 f,g adapted from Eidenschenk, R., Flussige Kristalle, Chem. Unserer Zeit, 18, 168-176 (1978). 

Figure 7.1 Schematic representation of calamitic and discotic liquid crystals. A = alkynyl, CH2, C(0)0, N=N,. .

Figure 7.3 Schematic representation of N and Colh discotic mesophases with the director vector n.

Figure 7.38 Schematic representation of the trinuclear discotic mesogens.

Figure 7.39 (a) Schematic representation of discotic mesogens with only three alkoxy chains (n = 7, 8) (b) schematic representation of the star-shaped dimer. 

Fig. 10. Schematic representation of nematic, smectic and discotic mesophases...

FIG. 2.16 Schematic representation of the four main types of mesophases. Smectic with ordered (a) and unordered (a ) arrangement of the molecules in layers b) nematic c) cholesteric and d) discotic (from Plate and Shibaev (1987) Courtesy Plenum Press). 

Lyotropic SCLCP are far less well studied by rheology than lyotropic MCLCPs. An example is the discotic SCLCP, as mentioned in Chap. 6 (Fig. 6.15), by Franse et al. (2002-2004). Fig. 16.37 gives a schematic representation of side chain discotic polymers (Franse, 2002). In solution the polymers have a tendency to form networks due to interaction between the discotic side chains. From viscoelastic measurements (G and G" as functions of angular frequency) it appeared that the networks formed in a 13% solution in 1,1,2-trichloroethane are very fragile, with a rubber modulus of not more than IN/m2. 

Fig. 2 Schematic representation of different calamitic and discotic thermotropic liquid crystals. (A) nematic (B) cholesteric (C-E) smectic (F) columnar hexagonal (G) columnar hexagonal tilted. (A-E Adapted from Ref F and G Adapted from Ref. l)...

Figure 63 Schematic representation of molecular structure of discotic molecules and three examples of organic discotic molecules.

Figure 2.4 Typical example of a discotic liquid crystal and schematic representation of its disc-like molecular shape...

Figure 2.8 Schematic representation of a discotic nematic phase (No)...

Figure 3. Schematic representation of the coiumnar arrangement of discotic zinc rr-decyl ether octa-substituted porphyrin stacks. Reprinted with permission from Liu, C, Y. Pan, H. L Tang, H. Fox, M. A. Bard, A. J. /. Phys. Chem. 1995, 99, 7632 1995 American Chemical Society,...

Fig. 11.8 Schematic representation of LC PMPs after magnetically forced alignment. The a discotic lamellar (Dl) structure of Poly-2 and the b hexagonal columnar (Colh) structure of Poly-3 at room temperature. Reprinted with permission from [13]. Copyright 2009, Elsevier...

FIGURE 6 Schematic representation of the discotic nematic phase, Nd (left) and of the columnar nematic phase, Njoi (right). 

Fig. 15 Schematic representation of the different types of supramolecular arrangements of discotics on surfaces with a edge-on orientation of the molecules, where the columnar axis is oriented parallel to the substrate (planar texture), and b face-on arrangement of the discotics leading to a homeotropic texture. Reproduced from [125]. (2005) Wiley-VCH...

Figure 3.32 Schematic representation of the packing behavior of acceptor polymers having different spacer lengths in a discotic columnar structure with low molar mass donors (a) spacer too short, (b) spacer of correct length, (c) spacer too long (permission being sought from [73]).

Figure 6 Schematic representation of two types of isodesmic growth (a) supramolecular polymerization of a rigid discotic monomer into a linear SP and (b) supramolecular polymerization of a bifunctional monomer bearing two binding groups connected by a spacer. The association constant for each iterative addition of monomer to the growing polymer chain is defined as the ratio of the rate constants of association to dissociation /fa = /fi//Ci).

Figure 9 Chemical structures of Cs-symmetrical bipyridine-based discotics and schematic representation of their propeller-like conformation assembling into linear supramolecular polymers in dilute isotropic solution. Reproduced from Palmans, A. R. A. Vekemans, J. A. J. M. Havinga, E. E. etal. Angew. Chem. Int. Ed 1997, 36, 2648-2651. ...

FIGURE 3.1 Schematic representations of commonly observed discotic liquid crystalline phases. Discotic nematic (a) columnar nematic (b) columnar hexagonal (c) columnar rectangular (d). 

Figure 1. Schematic representation of columnar structures of discotic mesogens (a) upright columns, (b) tilted columns.

Figure 3.20. Schematic representation of two different electronic device types and their desired arrangement of discotic molecules as electronically active components edge-on for FETs versus face-on for photovoltaic devices. Reproduced by permission of The Royal Society of Chemistry.

Fig. 16.3 Schematic representation of (a) a discotic nematic, (b) a columnar phase (Kimiar2006) 16.4.1.2.1 Nematic Discotic Phase...

Structure of parallel stripes with respect to the long liber axis with a spacing 3 nm (comparable to the diameter of the thinner fibrils observed in samples with a concentration below 0.25 mM). The 3 nm fibrils correspond quite well to the diameter of a discotic molecule of the gelator and most likely result from the single stacks of the molecules of 9c hydrogen bonded in the z-direction. These thinner fibrils subsequently associate into parallel bundles resulting in 9 nm fibers stabilized by hydrophobic interaction between the aliphatic chains (a schematic representation of the self-assembly is shown in Fig. 6.11). 

Fig. 4.22. Schematic representation of a discotic polymer liquid crystal investigated by Vallerien et al Arrows indicate rotations of the ester groups responsible for dielectric relaxation spectrum of this material. (From Ref. 106, with permission of Steinkopff Verlag.)...

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