Vortex Flow in Freestanding Smectic Films Driven by Elastic Relaxation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>c</mml:mi></mml:math>Director

Stannarius, Ralf; Bohley, Christian; Eremin, Alexey

doi:10.1103/physrevlett.97.097802

Cited by 26 publications

(23 citation statements)

References 23 publications

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“…There have been several reports of target patterns with many rings in a thin film of SmC LC [16,17,18,19,20]. If we compare our results to those reports, the C-director of the SmC phase plays the role of the director of the nematic.…”

Section: Discussionsupporting

confidence: 63%

Generation of multiple circular walls on a thin film of nematic liquid crystal by laser scanning

Kojima

Yamamoto

Sadakane

et al. 2008

Chemical Physics Letters

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We found that multiple circular walls (MCW) can be generated on a thin film of a nematic liquid crystal through a spiral scanning of a focused IR laser. The ratios between the radii of adjacent rings of MCW were almost constant. These constant ratios can be explained theoretically by minimization of the Frank elastic free energy of nematic medium. The director field on a MCW exhibits chiral symmetry-breaking although the elastic free energies of both chiral MCWs are degenerated, i.e., the director on a MCW can rotate clockwise or counterclockwise along the radial direction.

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Section: Discussionsupporting

confidence: 63%

Generation of multiple circular walls on a thin film of nematic liquid crystal by laser scanning

Kojima

Yamamoto

Sadakane

et al. 2008

Chemical Physics Letters

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“…Since the first descriptions of smectic freely suspended films about 40 years ago [1,2], they have been a rich source of scientific discoveries. Manifold studies have been devoted to understanding the structure, fluctuations and phase transitions in these films [3][4][5][6], hydrodynamic phenomena, and director field structures [7][8][9][10][11][12] as well as spontaneous pattern formation [13][14][15]. The dynamics and spontaneous self-organization of inclusions such as islands (regions of excess smectic layers) and droplets have been investigated [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Freely suspended smectic films with in-plane temperature gradients

et al. 2019

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Freely suspended smectic films with in-plane temperature inhomogeneities can exhibit remarkable thermocapillary (Marangoni) effects. The temperature dependence of the surface tension s ( ) T promotes flow in the film plane, convection roll patterns, and climbing of smectic layers against gravitational forces. We discuss several experimental geometries where macroscopic material transport is driven by temperature gradients, including experiments under normal gravity and observations in microgravitation during suborbital rocket flights and on the International Space Station. In all these experiments, the temperature dependence of the surface tension drives unidirectional material flow. The divergence of this flow near the hot and cold film edges, and at the boundaries of film islands in the film, is associated with the creation, motion and removal of dislocations. These dissipative processes limit the flow velocity.

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“…It should be mentioned that such vortex like patterns have been observed in freely suspended films of both Nematic 5 and Smectic liquid crystals 6 – 8 . It is shown that the vortex patterns in such liquid crystal experiments can be well studied in the frame work of electro-convection based instability theory 9 .…”

Section: Introductionmentioning

confidence: 79%

Theoretical explanation of rotational flow in the liquid-film motor

Najafi

Shirsavar

2021

Sci Rep

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A liquid film that is under the action of two electric forces, an external electric field parallel to the film and a lateral voltage difference applied to both edges of the film, exhibits a universal rotational flow. In this article, we revisit this phenomena by considering an idealized so-called liquid-film motor and provide a theoretical description of the underlying physical mechanism that is responsible for the rotation. Based on this theory, the external electric field induces a non-uniform distribution of freely moving charges on the film. Then the internal field that is mainly resulted from the lateral voltage difference, will exert forces on induced charges and subsequently will result the rotational flow. We show, how the fields contribute in developing a universal flow pattern.

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Vortex Flow in Freestanding Smectic Films Driven by Elastic Relaxation of thecDirector

Cited by 26 publications

References 23 publications

Generation of multiple circular walls on a thin film of nematic liquid crystal by laser scanning

Generation of multiple circular walls on a thin film of nematic liquid crystal by laser scanning

Freely suspended smectic films with in-plane temperature gradients

Theoretical explanation of rotational flow in the liquid-film motor

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