Spherical-cap droplets of a photo-responsive bent liquid crystal dimer

Yoshioka, Jun; Szűcs, Péter; Paterson, Daniel A.; Storey, John M. D.; Imrie, Corrie T.; Jákli, Antal; Araoka, Fumito; Buka, Ágnes

doi:10.1039/c8sm01751d

Cited by 31 publications

(3 citation statements)

References 60 publications

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“…One of the most suitable configurations to observe such a dynamic phenomenon with a structural deformation is a dispersion system of LC droplets in a liquid solvent. The reason for this is the structural diversity: it has been reported that, in LC droplets, the director field was stabilised with various configurations including defects, depending on the anchoring condition at the surface and the anisotropy of the elastic force [36][37][38][39][40][41][42][43][44]. As the motions of the droplets are strongly affected by their structures, it is reasonable that the dynamic phenomena observed in these LC droplets dispersed in a liquid solvent are also various as observed in recent investigations.…”

Section: Introductionmentioning

confidence: 75%

Self-excited oscillation of the director field in cholesteric liquid crystalline droplets under a temperature gradient

Yoshioka¹,

Fukao²

2020

J. Phys.: Condens. Matter

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In this study, we demonstrate a self-excited oscillation induced in cholesteric liquid crystalline droplets under a temperature gradient. At equilibrium, a winding Maltese cross pattern with a point defect was observed via polarised microscopy in the droplets dispersed in an isotropic solvent. When the temperature gradient was applied, the pattern was deformed owing to the Marangoni convection induced by the gradient. Here, when both the droplet size and temperature gradient were sufficiently large, the periodic movement of the defect together with the pattern deformation was observed, which demonstrated the self-excited oscillation of the director field. To describe this phenomenon, we theoretically analysed the flow and director fields by using Onsager's variational principle. This principle enabled the simplified description of the phenomenon; consequently, the time evolution of the director field could be expressed by the phenomenological equations for the two parameters characterising the field. These equations represented the van der Pol equation, which well expressed the mechanism of the self-excited oscillation.

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Section: Introductionmentioning

confidence: 75%

Self-excited oscillation of the director field in cholesteric liquid crystalline droplets under a temperature gradient

Yoshioka¹,

Fukao²

2020

J. Phys.: Condens. Matter

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“…An example of the macroscopic structure formed by LC has been observed in droplets composed of nematic (N), smectic, or cholesteric (Ch) phase [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Notably, the chiral LC system of the Ch droplets exhibits a wide range of structural diversity.…”

Section: Introductionmentioning

confidence: 99%

Morphogenesis of a chiral liquid crystalline droplet with topological reconnection and Lehmann rotation

Yoshioka

Ito

Fukao

2023

Preprint

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Morphogenesis is a hierarchical phenomenon that produces various macroscopic structures in living organisms, with high reproducibility. This study demonstrates that such structural formation can also be observed in a chiral liquid crystalline droplet under a temperature gradient. Through specific control of the temperature change process, we were able to switch the final structure obtained as a result of the formation via the appearance and reconnection of loop defects in the transient state during structure formation. Simultaneously, the existence of the gradient resulted in a characteristic rotational phenomenon called Lehmann rotation, which was prominently induced in the transient state. By demonstrating three-dimensional measurements of the flow field, we revealed the existence of Marangoni convection in the state. Consequently, it is indicated that the convection results in high-speed Lehmann rotation and large structural deformation with topological changes, thereby playing a significant role in the structure formation.

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“…For example, between the N phase and N TB phase. [46][47][48][49] In order to find liquid crystal dimers with interesting properties, a series of dimers containing a cholesteryl benzoate group were synthesized. These new dimers are denoted with the help of the symbol C-N-DN-x (x = 2, 4, 6, 8, 10, 12, 14), with x denoting the number of carbon atoms of the terminal alkoxy group of azobenzene.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystalline dimers containing a cholesteryl benzoate unit: smectic phase, chiral nematic phase and blue phase

Huang

et al. 2022

New J. Chem.

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Spherical-cap droplets of a photo-responsive bent liquid crystal dimer

Abstract: Using a photo-responsive dimer exhibiting the transition between nematic (N) and twist-bend nematic (NTB) phases, we prepared spherical cap-shaped droplets on solid substrates exposed to air.

Cited by 31 publications

References 60 publications

Self-excited oscillation of the director field in cholesteric liquid crystalline droplets under a temperature gradient

Self-excited oscillation of the director field in cholesteric liquid crystalline droplets under a temperature gradient

Morphogenesis of a chiral liquid crystalline droplet with topological reconnection and Lehmann rotation

Liquid crystalline dimers containing a cholesteryl benzoate unit: smectic phase, chiral nematic phase and blue phase

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