| Autor: |
L. Dolgov, O. Yaroshchuk, S. Tomylko, N. Lebovka |
| Jazyk: |
angličtina |
| Rok vydání: |
2012 |
| Předmět: |
|
| Zdroj: |
Condensed Matter Physics, Vol 15, Iss 3, p 33401 (2012) |
| Druh dokumentu: |
article |
| ISSN: |
1607-324X |
| DOI: |
10.5488/CMP.15.33401 |
| Popis: |
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 in situ dispergation of carbon nanotubes in LC cells. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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