Induced smectic phase in binary mixtures of twist-bend nematogens.

Beilstein Journal of Nanotechnology
Anamarija KneževićAndreja Lesac

Abstract

The investigation of liquid crystal (LC) mixtures is of great interest in tailoring material properties for specific applications. The recent discovery of the twist-bend nematic phase (NTB) has sparked great interest in the scientific community, not only from a fundamental viewpoint, but also due to its potential for innovative applications. Here we report on the unexpected phase behaviour of a binary mixture of twist-bend nematogens. A binary phase diagram for mixtures of imino-linked cyanobiphenyl (CBI) dimer and imino-linked benzoyloxy-benzylidene (BB) dimer shows two distinct domains. While mixtures containing less than 35 mol % of BB possess a wide temperature range twist-bend nematic phase, the mixtures containing 55-80 mol % of BB exhibit a smectic phase despite that both pure compounds display a Iso-N-NTB-Cr phase sequence. The phase diagram shows that the addition of BB of up to 30 mol % significantly extends the temperature range of the NTB phase, maintaining the temperature range of the nematic phase. The periodicity, obtained by atomic force microscopy (AFM) imaging, is in the range of 6-7 nm. The induction of the smectic phase in the mixtures containing 55-80 mol % of BB was confirmed using polarising optical micro...Continue Reading

References

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Citations

Oct 17, 2018·Soft Matter·Anamarija KneŽevićAndreja Lesac
Jul 20, 2019·Chemistry : a European Journal·Rebecca WalkerCorrie T Imrie
Jul 25, 2019·Physical Review. E·Nina TrbojevicMamatha Nagaraj
Jan 28, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Emily E PocockJohn W Goodby
Dec 29, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Rebecca WalkerCorrie T Imrie

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Methods Mentioned

BETA
differential scanning calorimetry
X-ray
small-angle scattering
AFM
differential

Software Mentioned

Turbomole

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