Twist Grain Boundary phases in proper ferroelectric liquid crystals realm
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arXiv
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| Format: | Preprint |
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2025
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| author | Pociecha, Damian Szydlowska, Jadwiga Vaupotič, Nataša Kwiatkowska, Katarzyna Juodka, Marijus Spiess, Julian Storey, John MD Imrie, Corrie T Walker, Rebecca Gorecka, Ewa |
| author_facet | Pociecha, Damian Szydlowska, Jadwiga Vaupotič, Nataša Kwiatkowska, Katarzyna Juodka, Marijus Spiess, Julian Storey, John MD Imrie, Corrie T Walker, Rebecca Gorecka, Ewa |
| contents | The twist-grain-boundary (TGB) phases, characterized by a periodic, helical arrangement of blocks made of polar smectic phases, SmAF and SmCF, have been discovered. They have been observed for rod-like molecules with a strong longitudinal dipole moment, featuring an (S)-2-methylbutyl end group having only weak twisting power, and emerge below the antiferroelectric SmAAF phase, where the lamellar structure is already well established. It is suggested that the structure is governed by electrostatic interactions amplified by weak chiral forces, in striking contrast to the mechanism of TGB phase formation found in non-polar materials. The TGB phases exhibit light selective reflection in the visible range, while the value of electric polarization confirms an almost perfectly ordered dipole alignment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_11862 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Twist Grain Boundary phases in proper ferroelectric liquid crystals realm Pociecha, Damian Szydlowska, Jadwiga Vaupotič, Nataša Kwiatkowska, Katarzyna Juodka, Marijus Spiess, Julian Storey, John MD Imrie, Corrie T Walker, Rebecca Gorecka, Ewa Soft Condensed Matter The twist-grain-boundary (TGB) phases, characterized by a periodic, helical arrangement of blocks made of polar smectic phases, SmAF and SmCF, have been discovered. They have been observed for rod-like molecules with a strong longitudinal dipole moment, featuring an (S)-2-methylbutyl end group having only weak twisting power, and emerge below the antiferroelectric SmAAF phase, where the lamellar structure is already well established. It is suggested that the structure is governed by electrostatic interactions amplified by weak chiral forces, in striking contrast to the mechanism of TGB phase formation found in non-polar materials. The TGB phases exhibit light selective reflection in the visible range, while the value of electric polarization confirms an almost perfectly ordered dipole alignment. |
| title | Twist Grain Boundary phases in proper ferroelectric liquid crystals realm |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2504.11862 |