Magnetic segregation effect in liquid crystals doped with carbon nanotubes
| Autor: | D. A. Petrov, Alexander N. Zakhlevnykh, D. V. Makarov, Pavel K Skokov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Fréedericksz transition Composite number General Physics and Astronomy magnetic field 02 engineering and technology Carbon nanotube lcsh:Chemical technology 010402 general chemistry lcsh:Technology 01 natural sciences Full Research Paper law.invention orientational transitions Liquid crystal Impurity law segregation effect Nanotechnology Molecule lcsh:TP1-1185 General Materials Science liquid crystal Electrical and Electronic Engineering lcsh:Science carbon nanotubes Condensed matter physics lcsh:T Doping 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences Magnetic field Condensed Matter::Soft Condensed Matter Nanoscience lcsh:Q 0210 nano-technology lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology Beilstein Journal of Nanotechnology, Vol 10, Iss 1, Pp 1464-1474 (2019) |
| ISSN: | 2190-4286 |
| Popis: | We study the orientational transitions in a suspension of carbon nanotubes in a nematic liquid crystal induced by an external magnetic field. The case of a finite orientational anchoring of liquid crystal molecules at the surface of doped carbon nanotubes is considered. It is shown that in a magnetic field the initial homogeneous planar texture of the liquid crystal–carbon nanotubes mixture is disturbed in a threshold manner (Fréedericksz transition). The orientational and concentration distributions of the suspension are studied for different values of the magnetic field strength and segregation intensity of the impurity subsystem. The optical phase lag between ordinary and extraordinary rays of light transmitted through a layer of a liquid crystal composite is calculated. The possibility of changing the nature of the Fréedericksz transition from second order to first order is shown. This tricritical behavior is related to the redistribution of the carbon nanotubes (segregation effect) inside the layer. |
| Databáze: | OpenAIRE |
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