Refractive Indices of the MHPB(H)PBC and MHPB(F)PBC Antiferroelectric Liquid Crystals

Raszewski, Zbigniew; Kędzierski, Jerzy; Perkowski, P.; Piecek, Wiktor; Rutkowska, Jolanta; Kłosowicz, Stanisław J.; Zielinski, Jerzy

doi:10.1080/00150190214411

Cited by 49 publications

(11 citation statements)

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“…For the tested chiral compounds, the average refractive index is about 1.5, thus the helical pitch can be calculated using the following relation p » ë max /1.5 [7].…”

Section: Methodsmentioning

confidence: 99%

Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains

Żurowska

Dąbrowski

Dziaduszek

et al. 2008

Opto-Electronics Review

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“…For the tested chiral compounds, the average refractive index is about 1.5, thus the helical pitch can be calculated using the following relation p » ë max /1.5 [7].…”

Section: Methodsmentioning

confidence: 99%

Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains

Żurowska

Dąbrowski

Dziaduszek

et al. 2008

Opto-Electronics Review

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“…calculated from the equation p = λ S /n av for SmC A * (the value n av = 1.5 was taken for calculation according to Ref. [27,28]). The transmission spectra were acquired using a Shimadzu UV-VIS-NIR spectrometer in the wavelength range of 360-3000 nm.…”

Section: Methodsmentioning

confidence: 99%

Helix parameters in bi- and multicomponent mixtures composed of orthoconic antiferroelectric liquid crystals with three ring molecular core

Czerwiński

Tykarska²

2014

Liquid Crystals

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Eight types of bicomponent systems composed of antiferroelectric compounds with different polarity of achiral chain and different temperature dependence of helical pitch as well as three multicomponent mixtures composed of antiferroelectric compounds with opposite helical twist sense were studied. The phase miscibility was tested by polarising optical microscopy. The results of the helical pitch and helical twist sense measurements obtained by a spectrophotometric method of selectively reflected light and by polarimetric method, respectively, are presented. It was found that it is possible to control helical pitch length and temperature of helix twist inversion in antiferroelectric mixtures by controlling the ratio of compounds with left-and right-handed helix in such mixtures, although all of them have the same chiral terminal chain.

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“…The obtained values of wavelengths of selectively reflected light λ s in SmC * A phase were divided by the mean refractive index to obtain the values of helical pitch p (the value of the mean refractive index for the class of materials used in this paper is about 1.5 [24]). The measurements of light transmission were made on a Shimadzu UV-VIS-NIR spectrophotometer in the range of 360-3000 nm.…”

Section: Methodsmentioning

confidence: 99%

The temperature and concentration dependence of helical pitch in the mixtures of antiferroelectric compounds with the opposite helical twist sense

2011

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To cite this article: M. Tykarska , M. Czerwiński & M. Żurowska (2011) The temperature and concentration dependence of helical pitch in the mixtures of antiferroelectric compounds with the opposite helical twist sense, Liquid Crystals, 38:5, 561-566,The temperature dependence of helical pitch for members of an homologous series of orthoconic antiferroelectric compounds (3FmHPhF) and their bicomponent mixtures (m = 3 and 5 as well as m = 3 and 7) has been measured by the method of selective light reflection. The compounds have the same chiral centre but they have different temperature dependence of the helical pitch as well as the helical twisting sense in SmC * A phase: right for member m = 3, left for m = 7, and both right and left for m = 5. For this last homologue, the change of twisting sense is connected with the appearance of the unwound structure. Concentration dependence on helical pitch was investigated in the mixtures. It was demonstrated that it is possible to obtain mixtures with desirable high pitch and also with totally unwound structure.

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Refractive Indices of the MHPB(H)PBC and MHPB(F)PBC Antiferroelectric Liquid Crystals

Cited by 49 publications

References 0 publications

Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains

Synthesis and properties of high tilted antiferroelectric esters with partially fluorinated alkoxyalkoxy terminal chains

Helix parameters in bi- and multicomponent mixtures composed of orthoconic antiferroelectric liquid crystals with three ring molecular core

The temperature and concentration dependence of helical pitch in the mixtures of antiferroelectric compounds with the opposite helical twist sense

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