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Optical ribbon assemblies

Figure 4.9. Optical ribbon assemblies. [Adapted from Quiroz, D., US Patent 6,647,188, Nov. 11, 2003.]... Figure 4.9. Optical ribbon assemblies. [Adapted from Quiroz, D., US Patent 6,647,188, Nov. 11, 2003.]...
Figure 4 Self-assembling structures and liquid crystalline phase behavior observed in solutions of Pu-2 in water with increasing peptide concentration c (log scale). Electron micrographs (a) of ribbons (c = 0.2mM), (b) and (c) of fibrils (c = 6.2mM), and (d) fibers. The curves in (e) were calculated with the generalized model described in the text (see also Figure 5d). The polarizing optical micrograph (f) shows the thick thread-like texture observed for a solution with c = 3.7mM in a 0.2 mM pathlength microslide ... Figure 4 Self-assembling structures and liquid crystalline phase behavior observed in solutions of Pu-2 in water with increasing peptide concentration c (log scale). Electron micrographs (a) of ribbons (c = 0.2mM), (b) and (c) of fibrils (c = 6.2mM), and (d) fibers. The curves in (e) were calculated with the generalized model described in the text (see also Figure 5d). The polarizing optical micrograph (f) shows the thick thread-like texture observed for a solution with c = 3.7mM in a 0.2 mM pathlength microslide ...
As part of an ongoing program focused on chirality in supramolecular systems [8, 39], it was noted that stereochemical aspects of H-bonding information may also be used to direct self-assembly processes. Racemic 12 produces a pleated ribbon comprised of doubly H-bonded components of alternating chirality, motif A. In contrast, optically pure 12 is predicted to form the cyclic hexamer B, provided the available H-bonding capacity is fully used... [Pg.10]

Percec and coworkers [184] utilized a similar strategy for the conversion of perfluorinated alkylene functionalized 3,4,5-trihydroxy benzoic acid-type dendrons into methyl methacrylate functionalized dendritic macromonomers. Characterization of the resulting linear-dendritic architectural copolymers involved DSC, x-ray diffraction, and thermal optical polarized microscopy. It was concluded that the self-assembly of the pendant dendritic mesogens forced the linear backbone into a tilted, helical ribbon-type structure. The self-assembly behavior was largely controlled by the multiplicity, composition, and molecular weights of the pendant dendritic mesogens. [Pg.225]


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See also in sourсe #XX -- [ Pg.232 ]




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