Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect

Recently, a Lehmann-type effect of rotation of small single crystals of chiral substances during their dissolution at the top of a nematic droplet has been reported, with the angular velocity of rotation of the dissolving crystals of the same size being proportional to the helical twisting power of...

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Datum:2008
Hauptverfasser: Gvozdovskyy, I.A., Lisetski, L.N.
Format: Artikel
Sprache:English
Veröffentlicht: НТК «Інститут монокристалів» НАН України 2008
Schriftenreihe:Functional Materials
Online Zugang:http://dspace.nbuv.gov.ua/handle/123456789/135271
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Zitieren:Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect // I.A. Gvozdovskyy, L.N. Lisetski // Functional Materials. — 2008. — Т. 15, № 3. — С. 388-391. — Бібліогр.: 9 назв. — англ.

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spelling irk-123456789-1352712018-06-15T03:06:16Z Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect Gvozdovskyy, I.A. Lisetski, L.N. Recently, a Lehmann-type effect of rotation of small single crystals of chiral substances during their dissolution at the top of a nematic droplet has been reported, with the angular velocity of rotation of the dissolving crystals of the same size being proportional to the helical twisting power of the dopant and rotational viscosity of the nematic solvent. In this paper, an inverse effect is reported - rotation of small single crystals of non-chiral substances during their dissolution at the top of a cholesteric liquid crystal matrix. The most important feature, i.e., direct proportionality of the rotation angular velocity to the degree of helical twisting, remains the same in this variant of the experiments, thus further supporting the idea that we deal with a direct evidence of transformation of the energy of chiral interactions into the energy of molecular movement. An important note is that the anisometry of the dopant is not relevant for this effect, with essentially similar results obtained for trans-stilbene and imidazole. Нещодавно було виявлено ефект, подібний до ефекту Лемана, який полягає в обертанні кристаликів хіральних речовин при їх розчиненні на поверхні краплини нематичного рідкого кристала, кутова швидкість обертання кристаликів однакового розміру пропорційна закручувальній здатності домішки та в'язкості нематичного розчинника. В цій роботі описано зворотній ефект — обертання кристаликів нехіральних речовин при їх розчиненні у холестеричній рідкокристалічній матриці. Найважливіша риса, тобто пряма пропорційність кутової швидкості обертання ступеня спірального закручування, зберігається і в цьому варіанті експерименту, підтверджуючи висновок про те, що в обох випадках ми маємо пряме свідчення перетворення енергії хіральних взаємодій в енергію молекулярного руху. Важливою особливістю є те, що молекулярна анізометрія домішки не є істотною у цьому ефекті — істотно подібні результати отримано для транс-стильбену та імідазолу. Недавно был выявлен эффект, подобный эффекту Лемана — вращение кристалликов хиральных веществ при их растворении на поверхности капли нематического жидкого кристалла; при этом угловая скорость вращения кристалликов одинакового размера пропорциональна закручивающей способности добавки и вращательной вязкости нематического растворителя. В данной работе описан обратный случай - вращение кристалликов нехиральных веществ при их растворении в холестерической жидкокристаллической матрице. Важнейшая особенность — прямая пропорциональность угловой скорости вращения степени спирального закручивания — сохраняется и в этом варианте эксперимента, подтверждая предположение о том, что в обоих случаях происходит превращение энергии хиральных взаимодействий в энергию молекулярного движения. При этом молекулярная анизометрия добавки не является существенной — близкие результаты получены для транс-стильбена и имидазола. 2008 Article Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect // I.A. Gvozdovskyy, L.N. Lisetski // Functional Materials. — 2008. — Т. 15, № 3. — С. 388-391. — Бібліогр.: 9 назв. — англ. 1027-5495 http://dspace.nbuv.gov.ua/handle/123456789/135271 en Functional Materials НТК «Інститут монокристалів» НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
description Recently, a Lehmann-type effect of rotation of small single crystals of chiral substances during their dissolution at the top of a nematic droplet has been reported, with the angular velocity of rotation of the dissolving crystals of the same size being proportional to the helical twisting power of the dopant and rotational viscosity of the nematic solvent. In this paper, an inverse effect is reported - rotation of small single crystals of non-chiral substances during their dissolution at the top of a cholesteric liquid crystal matrix. The most important feature, i.e., direct proportionality of the rotation angular velocity to the degree of helical twisting, remains the same in this variant of the experiments, thus further supporting the idea that we deal with a direct evidence of transformation of the energy of chiral interactions into the energy of molecular movement. An important note is that the anisometry of the dopant is not relevant for this effect, with essentially similar results obtained for trans-stilbene and imidazole.
format Article
author Gvozdovskyy, I.A.
Lisetski, L.N.
spellingShingle Gvozdovskyy, I.A.
Lisetski, L.N.
Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect
Functional Materials
author_facet Gvozdovskyy, I.A.
Lisetski, L.N.
author_sort Gvozdovskyy, I.A.
title Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect
title_short Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect
title_full Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect
title_fullStr Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect
title_full_unstemmed Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect
title_sort rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the lehmann-type effect
publisher НТК «Інститут монокристалів» НАН України
publishDate 2008
url http://dspace.nbuv.gov.ua/handle/123456789/135271
citation_txt Rotation of small crystals of non-chiral substances at the top of a cholesteric droplet: an inverse case of the Lehmann-type effect // I.A. Gvozdovskyy, L.N. Lisetski // Functional Materials. — 2008. — Т. 15, № 3. — С. 388-391. — Бібліогр.: 9 назв. — англ.
series Functional Materials
work_keys_str_mv AT gvozdovskyyia rotationofsmallcrystalsofnonchiralsubstancesatthetopofacholestericdropletaninversecaseofthelehmanntypeeffect
AT lisetskiln rotationofsmallcrystalsofnonchiralsubstancesatthetopofacholestericdropletaninversecaseofthelehmanntypeeffect
first_indexed 2025-07-09T22:57:49Z
last_indexed 2025-07-09T22:57:49Z
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