Effect of the terminal branching structure of some liquid-crystalline biphenyl carboxylates on the stability of the antiferroelectric phase

Ouchi, Yukio; Yoshioka, Yasue; Ishii, Hisao; Seki, Kazuhiko; Kitamura, Masato; Noyori, Ryoji; Takanishi, Yoichi; Nishiyama, Isa

doi:10.1039/jm9950502297

Cited by 56 publications

(17 citation statements)

References 6 publications

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“…5) exhibits new peaks at 1605 cm À1 and 1523 cm À1 . These peaks are most likely to be associated with oscillations of the carboxyl group [33], thus confirming that OBPh adsorbs on the surface of magnetite nanorods more easily than E7. Finally, a small signal appears at 2226 cm À1 in the FTIR spectrum from the suspension of nanorods in the OBPh -E7 mixture (see spectrum d in Fig.…”

Section: Nanorod Suspension In Nematic Liquid Crystalmentioning

confidence: 66%

Magnetite nanorod thermotropic liquid crystal colloids: Synthesis, optics and theory

Podoliak

Buchnev

Bavykin

et al. 2012

Journal of Colloid and Interface Science

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Section: Nanorod Suspension In Nematic Liquid Crystalmentioning

confidence: 66%

Magnetite nanorod thermotropic liquid crystal colloids: Synthesis, optics and theory

Podoliak

Buchnev

Bavykin

et al. 2012

Journal of Colloid and Interface Science

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“…The increase of the smectic layer spacing with lowering temperature not only in SmC Ã A but also in SmC Ã has been observed in several compounds and mixtures, although detailed study has not been carried out as yet. [47][48][49][50][51][52][53][54] This means that the relative displacements of molecules along their long axes or the layer undulational fluctuations as the pretransitional effect may play an important role in the temperature variation of the smectic layer spacing. In other words, we can insist on the importance of the other transition from SmC Ã /SmC Ã A to the hexatic or crystalline phase than the one from SmA to SmC Ã /SmC Ã A .…”

Section: Liquid Crystals 873mentioning

confidence: 99%

Renewed focus on the small temperature change of smectic layer spacing in ferroelectric and antiferroelectric LCs

et al. 2015

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We aim at becoming released from the invisible hand of de Vries scenario that a small temperature change in the smectic layer spacing must be caused by 'the far-fetched orientational distribution called the de Vries diffused cone' or 'the in-layer directors statically tilted and randomly distributed around the smectic layer normal'. First, we show in a prototypal compound MC513 that all the unusual properties suggesting the revival of a de Vries-type SmA-SmC Ã transition can be explained by ordinary SmA emergence just below the isotropic phase only in a narrow temperature range. Second, we take up the unconventional molecular structure of TSiKN65, thus far regarded as a typical de Vries material; the core part makes a large angle of β c ,30 with respect to the average molecular long axis. We insist that a slight change in β c can explain almost all the unusual properties without taking account of the de Vries scenario. Last but not least is a practical point of view. During a thermal shock cyclic reliability test between −20°C and 60°C in prototyping antiferroelectric liquid crystal displays (AFLCDs), DENSO noticed the importance of the transition from SmC Ã A to the hexatic or crystalline phase; the cell quality critically depends on the layer spacing change in the lower-temperature part of SmC Ã A . We point out that the relative displacements of molecules along their long axes and hence the layer undulational fluctuations play an important role in addition to the director tilting ones.

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“…This observation has been made use of in preparing materials that exhibit the alternating smectic C phase, which is the achiral analogue of the antiferroelectric phase [36]. Figure 26 shows a table of a series of compounds where the branching chain is increased in length until it matches the length of the terminal aliphatic chain [37]. It can be seen from this table that the alternating smectic C phase becomes more stable as the chain length of the lateral substituent is increased, and eventually it replaces the smectic C phase.…”

Section: Lateral Substituentsmentioning

confidence: 99%

Non‐Chiral Smectic Liquid Crystals: Synthesis of Non‐Chiral Smectic Liquid Crystals

Goodby¹

1998

Handbook of Liquid Crystals

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The synthesis of nonchiral smectic liquid crystals is a broad topic for discussion, however, it can be divided into subsections in two different ways. For example, smectic systems can be split into metallomesogens and nonmetallomesogens, alternatively, they can be divided into materials for (1) mesophase structure elucidation and classification [I], (2) property-structure correlations [2]; and ( 3 ) host systems for ferroelectric and antiferroelectric mixtures. In the following sections template structures used for the synthesis of smectic materials will be described, followed by discussions of the syntheses of materials that have extensive histories in the elucidation of smectic phase structures, and finally of the syntheses of smectogens that are useful in applications.

show abstract

Effect of the terminal branching structure of some liquid-crystalline biphenyl carboxylates on the stability of the antiferroelectric phase

Cited by 56 publications

References 6 publications

Magnetite nanorod thermotropic liquid crystal colloids: Synthesis, optics and theory

Magnetite nanorod thermotropic liquid crystal colloids: Synthesis, optics and theory

Renewed focus on the small temperature change of smectic layer spacing in ferroelectric and antiferroelectric LCs

Non‐Chiral Smectic Liquid Crystals: Synthesis of Non‐Chiral Smectic Liquid Crystals

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