Mobility of Ions in the Nematic Phase of 4-n-Octyl-4'-cyanobiphenyl (8CB)

Sawada, Atsushi; Naemura, Shohei

doi:10.1143/jjap.41.l195

Cited by 23 publications

(10 citation statements)

References 14 publications

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“…In our calculations we used the value l ¼ 8 10 À11 m 2 =Vs obtained from References [28]. The averaged values of n s estimated for different treatment procedures are presented in Table 1.…”

Section: Resultsmentioning

confidence: 99%

The Interfacial Dipole-to-Dipole Interaction as a Factor of Polar Anchoring in the Cells with Planar Liquid Crystal Alignment

Yaroshchuk

Kovalchuk

Kravchuk

2005

Molecular Crystals and Liquid Crystals

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The frequency of dipole relaxation of liquid crystal (LC) layer at LC-solid interface, f r , is shown to be in full correlation with the polar anchoring energy W p ; the increase of W p is accompanied with the decrease of f r . This correlation is established by the use of the aligning polyimide layers treated with different methods. The anchoring energy increases and the relaxation frequency decreases in the following sequence of processes: rubbing-photoalignment-plasma beam alignment. The correlation between W p and f r is an evidence of strong contribution of dipole-to-dipole interaction at the LC-substrate interface to polar anchoring of LC. Based on this correlation new method of polar anchoring measurement can be developed.

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Section: Resultsmentioning

confidence: 99%

The Interfacial Dipole-to-Dipole Interaction as a Factor of Polar Anchoring in the Cells with Planar Liquid Crystal Alignment

Yaroshchuk

Kovalchuk

Kravchuk

2005

Molecular Crystals and Liquid Crystals

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“…Cybotactic clusters in liquid crystals are known to be a transitional phenomenon, with smectic clusters growing in size as the temperature decreases below T AN , the smectic A-nematic transition temperature [30]. For the bulge amphiphiles, the nematic domains may be expected to grow within the smectic monolayer as the barriers are compressed.…”

Section: Bulge Amphiphile Reversible Collapse Mechanismmentioning

confidence: 99%

Reversible collapse of the Langmuir films of a series of triphenylsilyl ether-terminated amphiphiles

et al. 2011

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“…At Ds ¼ 0.73*10 À8 Om À1 m À1 and m ¼ 10 À10 m 2 =Vs taken from [13], the value of the ion density on the substrates is n s ¼ 6.1 10 15 m À2 . Note, that this estimate is correct when the ion recombination in not essential.…”

Section: 1 Lc Filling In Atmospherementioning

confidence: 99%

Filling initiated ion transport processesin liquid crystal cell

Kravchuk

Kovalchuk

Yaroshchuk

2002

Molecular Crystals and Liquid Crystals

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The ion adsorption=desorption processes initiated by LC filling in liquid crystal (LC) cells are studied. The LC we used was 5CB and the aligning substrates were UV irradiated polyvinylcinnamate (PVCN) films providing planar alignment of LC. It is shown that intensity of adsorption=desorption processes is strongly determined by purity of LC and irradiation associated parameters, such as exposure dose t exp and time period between irradiation and LC filling t fÀi . To fill the cells we used both 5CB kept in air and 5CB vacuumed at 10 À2 Torr over 1 h. The ion concentration in first portion of LC was estimated to be higher by factor 2 compared with the second one. The cell filling with LC kept in atmosphere is associated with intensive ion adsorption from LC bulk to aligning substrates (when exposure time is zero or when t fÀI > 1h) or with both adsorption and desorption of ions (in case when t fÀi ( 1h). In contrast, cell filling with vacuumed LC mainly initiates ions desorption from the polymer substrates. The latter effect is observed for non-irradiated cells too. This shows that even non-irradiated substrate charges, more likely by adsorption of air ions. The following UV irradiation just increases charging of aligning substrates.

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Mobility of Ions in the Nematic Phase of 4-n-Octyl-4'-cyanobiphenyl (8CB)

Cited by 23 publications

References 14 publications

The Interfacial Dipole-to-Dipole Interaction as a Factor of Polar Anchoring in the Cells with Planar Liquid Crystal Alignment

The Interfacial Dipole-to-Dipole Interaction as a Factor of Polar Anchoring in the Cells with Planar Liquid Crystal Alignment

Reversible collapse of the Langmuir films of a series of triphenylsilyl ether-terminated amphiphiles

Filling initiated ion transport processesin liquid crystal cell

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