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Pociecha, Damian
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Publications (7/7 displayed)
- 2024A design approach to obtaining highly polar liquid crystal dimerscitations
- 2024A design approach to obtaining highly polar liquid crystal dimers.citations
- 2023Benefits of increasing surface to volume ratio for improving electrochemical performance of poly(3‐hexylthiophene): Electrospun fibers vs. filmscitations
- 2021Twist-Bend Nematic Glassescitations
- 2021Multiple Polar and Non-polar Nematic Phasescitations
- 2021Multiple polar and non‐polar nematic phases.citations
- 2018Synthesis and characterization of two new TiO2-containing benzothiazole-based imine composites for organic device applications
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article
Twist-Bend Nematic Glasses
Abstract
<p>A selection of pyrene-based liquid crystal dimers have been prepared, containing either methylene-ether or diether linked spacers of varying length and parity. All the diether linked materials, CBOnO.Py (n=5, 6, 11, 12), exhibit conventional nematic and smectic A phases, with the exception of CBO11O.Py which is exclusively nematic. The methylene-ether linked dimer, CBnO.Py, with an even-membered spacer (n=5) was solely nematogenic, but odd-members (n=6, 8, 10) exhibited both nematic and twist-bend nematic phases. Replacement of the cyanobiphenyl fragment by cyanoterphenyl giving CT6O.Py, gave elevated melting and nematic-isotropic transition temperatures, and SmA and SmC<sub>A</sub> phases were observed on cooling the nematic phase. Intermolecular face-to-face associations of the pyrene moieties drive glass formation, and all these materials have a glass transition temperature at or above room temperature. The stability of the glassy twist-bend nematic phase allowed for its study using AFM, and the helical pitch length, P<sub>TB</sub>, was measured as 6.3 and 6.7 nm for CB6O.Py and CB8O.Py, respectively. These values are comparable to the shortest pitch of a twist-bend nematic phase measured to date.</p>