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

• Дата: 2008
• Автори: Gvozdovskyy, I.A., Lisetski, L.N.
• Формат: Стаття
• Мова: English
• Опубліковано: НТК «Інститут монокристалів» НАН України 2008
• Назва видання: Functional Materials
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/135271
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: 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.

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.