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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202101305
|2 doi
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|a pubmed24n1094.xml
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|a (DE-627)NLM328239844
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|a DE-627
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|a eng
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|a Nishikawa, Hiroya
|e verfasserin
|4 aut
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|a A New Class of Chiral Nematic Phase with Helical Polar Order
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|c 2021
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 02.09.2021
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2021 Wiley-VCH GmbH.
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|a A novel chiral nematic phase with a polar helical order is realized via the introduction of helical twisting power into a polar nematogen. The properties of the induced polar nematic (polar cholesteric: Np*) phase differ from those of the conventional cholesteric (N*) phases existing thus far. Np*, which is a new class of N* structures, is characterized not only by its helically twisted nematic director, but also by a continuously twisted polarization. Transmission spectroscopy and helical pitch measurements in a wedge cell revealed that the half-helical pitch in the Np* phase vanished because of the polar response in the Np* helix. The inner polar director in the Np* phase is confirmed in dielectric and second-harmonic-generation studies. Furthermore, this unique Np*LC, which corresponds to a half-/full-pitch helix, enables ultrafast electro-optic switching (τ < 20 µs), and proposes new potential applications for electrically interchangeable photonic bandgaps
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|a Journal Article
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|a helical superstructures
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|a photonic bandgap
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| 650 |
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|a polar cholesteric phase
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|a polar nematic phase
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|a second-harmonic generation
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|a Araoka, Fumito
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 33(2021), 35 vom: 09. Sept., Seite e2101305
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g volume:33
|g year:2021
|g number:35
|g day:09
|g month:09
|g pages:e2101305
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|u http://dx.doi.org/10.1002/adma.202101305
|3 Volltext
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