Glassforming liquid crystalline equimolar mixtures of MHPOBC and fluorinated compounds -- structural, optical, and dielectric properties
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| Format: | Preprint |
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2025
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| _version_ | 1866913899623743488 |
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| author | Deptuch, Aleksandra Paliga, Anna Drzewicz, Anna Czerwiński, Michał Juszyńska-Gałązka, Ewa |
| author_facet | Deptuch, Aleksandra Paliga, Anna Drzewicz, Anna Czerwiński, Michał Juszyńska-Gałązka, Ewa |
| contents | Three liquid crystalline equimolar mixtures are formulated, each containing the MHPOBC compound and the homolog from the 3FmHPhF6 series with m = 4, 5, and 6. The properties of the mixtures are investigated by differential scanning calorimetry, polarizing optical microscopy, X-ray diffraction, electro-optic measurements, and UV-Vis-NIR and dielectric spectroscopies. In all mixtures, the smectic A*, smectic C*, and smectic C$_A$* phases are observed. Each mixture can be supercooled and forms the glass of smectic C$_A$* at 225-238 K. The glass transition temperature decreases with the increasing C$_m$H$_{2m}$ chain length in the 3FmHPhF6 molecule. The tilt angle in the smectic C$_A$* phase reaches 36.5-37.5°. The selective reflection of light in the visible and near-infrared spectral ranges is observed, with a strong dependence of the reflected light's wavenumber on temperature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_16980 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Glassforming liquid crystalline equimolar mixtures of MHPOBC and fluorinated compounds -- structural, optical, and dielectric properties Deptuch, Aleksandra Paliga, Anna Drzewicz, Anna Czerwiński, Michał Juszyńska-Gałązka, Ewa Soft Condensed Matter Three liquid crystalline equimolar mixtures are formulated, each containing the MHPOBC compound and the homolog from the 3FmHPhF6 series with m = 4, 5, and 6. The properties of the mixtures are investigated by differential scanning calorimetry, polarizing optical microscopy, X-ray diffraction, electro-optic measurements, and UV-Vis-NIR and dielectric spectroscopies. In all mixtures, the smectic A*, smectic C*, and smectic C$_A$* phases are observed. Each mixture can be supercooled and forms the glass of smectic C$_A$* at 225-238 K. The glass transition temperature decreases with the increasing C$_m$H$_{2m}$ chain length in the 3FmHPhF6 molecule. The tilt angle in the smectic C$_A$* phase reaches 36.5-37.5°. The selective reflection of light in the visible and near-infrared spectral ranges is observed, with a strong dependence of the reflected light's wavenumber on temperature. |
| title | Glassforming liquid crystalline equimolar mixtures of MHPOBC and fluorinated compounds -- structural, optical, and dielectric properties |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2501.16980 |