Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions
Cholesteric droplets dispersed in polymer with conical boundary conditions have been studied. The director configurations are identified by the polarising microscopy technique. The axisymmetric twisted axial-bipolar configuration with the surface circular defect at the droplet’s equator is formed at...
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MDPI AG
2020-04-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/25/7/1740 |
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| author | Anna P. Gardymova Mikhail N. Krakhalev Victor Ya. Zyryanov |
| author_facet | Anna P. Gardymova Mikhail N. Krakhalev Victor Ya. Zyryanov |
| author_sort | Anna P. Gardymova |
| collection | DOAJ |
| description | Cholesteric droplets dispersed in polymer with conical boundary conditions have been studied. The director configurations are identified by the polarising microscopy technique. The axisymmetric twisted axial-bipolar configuration with the surface circular defect at the droplet’s equator is formed at the relative chirality parameter <inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>N</mi> <mn>0</mn> </msub> <mo>≤</mo> <mn>2.9</mn> </mrow> </semantics> </math> </inline-formula>. The intermediate director configuration with the deformed circular defect is realised at <inline-formula> <math display="inline"> <semantics> <mrow> <mn>2.9</mn> <mo><</mo> <msub> <mi>N</mi> <mn>0</mn> </msub> <mo><</mo> <mn>3.95</mn> </mrow> </semantics> </math> </inline-formula>, and the layer-like structure with the twisted surface defect loop is observed at <inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>N</mi> <mn>0</mn> </msub> <mo>≥</mo> <mn>3.95</mn> </mrow> </semantics> </math> </inline-formula>. The cholesteric layers in the layer-like structure are slightly distorted although the cholesteric helix is untwisted. |
| first_indexed | 2024-03-10T20:33:14Z |
| format | Article |
| id | doaj.art-b32cec12e2be4a5e8f80fbf33ab17f92 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T20:33:14Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-b32cec12e2be4a5e8f80fbf33ab17f922023-11-19T21:13:06ZengMDPI AGMolecules1420-30492020-04-01257174010.3390/molecules25071740Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary ConditionsAnna P. Gardymova0Mikhail N. Krakhalev1Victor Ya. Zyryanov2Institute of Engineering Physics and Radio Electronics, Siberian Federal University, 660041 Krasnoyarsk, RussiaInstitute of Engineering Physics and Radio Electronics, Siberian Federal University, 660041 Krasnoyarsk, RussiaKirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, RussiaCholesteric droplets dispersed in polymer with conical boundary conditions have been studied. The director configurations are identified by the polarising microscopy technique. The axisymmetric twisted axial-bipolar configuration with the surface circular defect at the droplet’s equator is formed at the relative chirality parameter <inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>N</mi> <mn>0</mn> </msub> <mo>≤</mo> <mn>2.9</mn> </mrow> </semantics> </math> </inline-formula>. The intermediate director configuration with the deformed circular defect is realised at <inline-formula> <math display="inline"> <semantics> <mrow> <mn>2.9</mn> <mo><</mo> <msub> <mi>N</mi> <mn>0</mn> </msub> <mo><</mo> <mn>3.95</mn> </mrow> </semantics> </math> </inline-formula>, and the layer-like structure with the twisted surface defect loop is observed at <inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>N</mi> <mn>0</mn> </msub> <mo>≥</mo> <mn>3.95</mn> </mrow> </semantics> </math> </inline-formula>. The cholesteric layers in the layer-like structure are slightly distorted although the cholesteric helix is untwisted.https://www.mdpi.com/1420-3049/25/7/1740cholesteric liquid crystaldropletoptical textureorientational structureconical surface anchoringtopological defect |
| spellingShingle | Anna P. Gardymova Mikhail N. Krakhalev Victor Ya. Zyryanov Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions Molecules cholesteric liquid crystal droplet optical texture orientational structure conical surface anchoring topological defect |
| title | Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions |
| title_full | Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions |
| title_fullStr | Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions |
| title_full_unstemmed | Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions |
| title_short | Optical Textures and Orientational Structures in Cholesteric Droplets with Conical Boundary Conditions |
| title_sort | optical textures and orientational structures in cholesteric droplets with conical boundary conditions |
| topic | cholesteric liquid crystal droplet optical texture orientational structure conical surface anchoring topological defect |
| url | https://www.mdpi.com/1420-3049/25/7/1740 |
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