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Switching cholesterics

Cholesteric LCs can act as hosts for dyes to produce coloured displays (see section 5.2.2.1 below) " their temperature dependent colour change has found applications in thermochromic inks, °" and as pigments and copy safe colours their selective reflecting capabilities have been applied in colours and filters for reflective displays and projection systems, " reflective polarisers and their electrical field induced switching in displays and smart reflectors, in colour patterning for full-colour recording. ... [Pg.314]

Fig. 32a, b. Volt-contrast (a) and current-voltage (b) characteristics for polyimide modulator with cholesteric-nematic phase transition without (/) and with switch (2) on the recording light [254]... [Pg.50]

The cholesteric screw sense was measured by the Grandjean-Cano method, which showed that M-cis-17a and P-trans-17b give cholesteric phases with opposite handedness. Observations of the switching behavior of 17 in a large number of LC materials,... [Pg.156]

Poly[N-methyl-N -(2-methyl-6-isopropylphenyl)carbodiimide] maintains its chiral conformation even at elevated temperatures, and poly[-N-dodecyl-N -l-naphthylcarbodiimide] displays birefringent cholesteric mesophases. Stable helical polyguanidines are obtained from the same carbodiimide using chiral titanium catalysts in the polymerization. Also, using a chiral titanium catalyst chirooptical switching polyguanidines are obtained from N-(l-anthranyl)-N -octadecylcarbodiimide. ... [Pg.249]

Pieraccini S, Gottarelli G, Labruto R, Masiero S, Pandoli O, Spada GP. 2004. The control of the cholesteric pitch by some azo photochemical chiral switches. Chem Eur J... [Pg.361]

Tong X, Zhao Y. 2003. Self assembled cholesteric liquid crystal gels for electro optical switching. J Mater Chem 13 1491 1495. [Pg.408]

The photoisomerization of chiral azobenzene dopants often leads to the dramatic change in their HTPs. When it is used in combination with another non-photoresponsive chiral dopant with opposite chirality to form a compensated system, the change in HTP can be utilized to reversibly switch the LC phase between compensated nematic and cholesteric [49]. [Pg.144]

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See also in sourсe #XX -- [ Pg.279 ]



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Cholesteric

Cholesterics

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