Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes
A pronounced irreversible electro-optical response (memory effect) has been recently observed for nematic liquid crystal (LC) EBBA doped by multi-walled carbon nanotubes (MWCNTs) near the percolation threshold of the MWCNTs (0.02÷0.05 wt. %). It is caused by irreversible homeotropic-to-planar reorie...
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| Дата: | 2012 |
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| Автори: | , , , |
| Формат: | Стаття |
| Мова: | English |
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Інститут фізики конденсованих систем НАН України
2012
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/120794 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes / L. Dolgov, O. Yaroshchuk, S. Tomylkom, N. Lebovka// Condensed Matter Physics. — 2012. — Т. 15, № 3. — С. 33401:1-8. — Бібліогр.: 17 назв. — англ. |
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irk-123456789-1207942017-06-14T03:03:16Z Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes Dolgov, L. Yaroshchuk, O. Tomylko, S. Lebovka, N. A pronounced irreversible electro-optical response (memory effect) has been recently observed for nematic liquid crystal (LC) EBBA doped by multi-walled carbon nanotubes (MWCNTs) near the percolation threshold of the MWCNTs (0.02÷0.05 wt. %). It is caused by irreversible homeotropic-to-planar reorientation of LC in an electric field. This feature is explained by electro-hydrodynamically stimulated dispergation of MWCNTs in LC and by the formation of a percolation MWCNT network which acts as a spatially distributed surface stabilizing the planar state of the LC. This mechanism is confirmed by the absence of memory in the EBBA/MWCNT composites, whose original structure is fixed by a polymer. The observed effect suggests new operation modes for the memory type and bistable LC devices, as well as a method for \textit{in situ} dispergation of carbon nanotubes in LC cells. В нематичному рiдкому кристалi (РК) ЕББА, допованому багатошаровими вуглецевими нанотрубками (БШВНТ), поблизу перколяцiйної концентрацiї БШВНТ (0.02 ÷ 0.05 ваг. %) нещодавно спостережено виразний необоротний електрооптичний вiдгук (ефект пам’ятi). Цей ефект викликаний необоротною переорiєнтацiєю РК в електричному полi з гомеотропного у планарний стан. Ця особливiсть пояснюється електрогiдродинамiчно стимульованою диспергацiєю БШВНТ в РК i формуванням перколяцiйної сiтки БШВНТ, яка дiє як просторово розподiлена поверхня, що стабiлiзує планарний стан РК. Цей механiзм пiдтверджується вiдсутнiстю пам’ятi в композитах ЕББА/БШВНТ, у яких початкова структура зафiксована полiмером. Цей ефект може бути корисним для розробки нових типiв запам’ятовуючих та бiстабiльних РК пристроїв, а також для пiдсилення диспергацiї БШВНТ безпосередньо в РК комiрках. 2012 Article Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes / L. Dolgov, O. Yaroshchuk, S. Tomylkom, N. Lebovka// Condensed Matter Physics. — 2012. — Т. 15, № 3. — С. 33401:1-8. — Бібліогр.: 17 назв. — англ. 1607-324X PACS: 42.70.Df, 42.79.Kr, 77.22.Ch, 77.84.Lf, 81.07.De DOI:10.5488/CMP.15.33401 arXiv:1210.1431 http://dspace.nbuv.gov.ua/handle/123456789/120794 en Condensed Matter Physics Інститут фізики конденсованих систем НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| description |
A pronounced irreversible electro-optical response (memory effect) has been recently observed for nematic liquid crystal (LC) EBBA doped by multi-walled carbon nanotubes (MWCNTs) near the percolation threshold of the MWCNTs (0.02÷0.05 wt. %). It is caused by irreversible homeotropic-to-planar reorientation of LC in an electric field. This feature is explained by electro-hydrodynamically stimulated dispergation of MWCNTs in LC and by the formation of a percolation MWCNT network which acts as a spatially distributed surface stabilizing the planar state of the LC. This mechanism is confirmed by the absence of memory in the EBBA/MWCNT composites, whose original structure is fixed by a polymer. The observed effect suggests new operation modes for the memory type and bistable LC devices, as well as a method for \textit{in situ} dispergation of carbon nanotubes in LC cells. |
| format |
Article |
| author |
Dolgov, L. Yaroshchuk, O. Tomylko, S. Lebovka, N. |
| spellingShingle |
Dolgov, L. Yaroshchuk, O. Tomylko, S. Lebovka, N. Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes Condensed Matter Physics |
| author_facet |
Dolgov, L. Yaroshchuk, O. Tomylko, S. Lebovka, N. |
| author_sort |
Dolgov, L. |
| title |
Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes |
| title_short |
Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes |
| title_full |
Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes |
| title_fullStr |
Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes |
| title_full_unstemmed |
Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes |
| title_sort |
electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2012 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/120794 |
| citation_txt |
Electro-optical memory of a nematic liquid crystal doped by multi-walled carbon nanotubes / L. Dolgov, O. Yaroshchuk, S. Tomylkom, N. Lebovka// Condensed Matter Physics. — 2012. — Т. 15, № 3. — С. 33401:1-8. — Бібліогр.: 17 назв. — англ. |
| series |
Condensed Matter Physics |
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2023-10-18T20:37:46Z |
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