Abstract
A homologous series of methylene- and thioether-linked cyanobiphenyl-based liquid crystal dimers, CBnSCB, was developed and found to exhibit stable twist-bend nematic (NTB) phases, which undergo vitrification to give NTBglass phases.
Highlights
Liquid crystals (LCs) are fascinating mesophases between solid crystals and isotropic liquids, which inherently possess both anisotropic and fluidic physical properties
In our previous work, we revealed that thioether-linked LC dimers have a beneficial effect in the realization of the NTB phase over a wide temperature range and the room-temperature NTB and NTB glass (NTBG) phases.[61,64,67,68,70]
It is clear that a relatively long spacer is a prerequisite to form the N phase. This trend could be associated with molecular geometrical biaxiality and anisotropy, which is enhanced for LC dimers with short and long spacers, respectively
Summary
Liquid crystals (LCs) are fascinating mesophases between solid crystals and isotropic liquids, which inherently possess both anisotropic and fluidic physical properties. The NTB phases of CBnSCB (n = 4, 6, and 8) were supercooled to room temperature without any discernible crystallization peaks, and these samples vitrified to yield the NTBG phase upon cooling [Fig. 4(b)–(d)].
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