Photo-controllable rotational motion of cholesteric liquid crystalline droplets in a dispersion system

Sakai, Yota; Sohn, Woon Yong; Katayama, Kenji

doi:10.1039/d0ra03465g

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…[22][23][24] We focused on the photo-controlled motion of the LC droplets by promoting adsorption and desorption of molecules at the interface and could demonstrate the LC droplets approaching to and drawing away from a light source, 25,26 and showed a clockwise/anti-clockwise rotation under the light. 27 During this study, we found a crystallization of a chemical was triggered by light at the topological defect in a pure LC droplet, even though the chemical was dissolved outside the LC droplet. Under the light irradiation whose wavelength matches the absorption of chemicals, a crystal was formed inside an LC droplet.…”

Section: Introductionmentioning

confidence: 76%

Photocontrollable Crystallization at the Topological Defect of a Liquid Crystalline Droplet

Katayama¹,

Sakai²

2021

Preprint

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Photo-controllable crystallization at the topological defect in an LC droplet was demonstrated. The dye molecules dissolved in a surfactant solution outside the LC droplet were promoted to move into the droplet by the light absorption. Nuclei emerged tens of seconds after light irradiation and moved toward the topological defect located at the droplet center, forming a branch-shaped crystal. This phenomenon was reproduced for three different dyes, and photo-induced migration, nucleation, and crystal formation were discussed as a possible mechanism.

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Section: Introductionmentioning

confidence: 76%

Photocontrollable Crystallization at the Topological Defect of a Liquid Crystalline Droplet

Katayama¹,

Sakai²

2021

Preprint

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“…In this study, we accidentally found a unique crystallization phenomenon while studying a new category of active matters consisting of LCs. − During this study, we found that crystallization of a solute was triggered by light at the topological defect in a pure LC droplet even though the solute was dissolved outside the LC droplet. A crystal was formed inside the LC droplet when using light irradiation at a wavelength that matches the absorption of the solute.…”

Section: Introductionmentioning

confidence: 98%

Photocontrollable Crystallization at the Topological Defect of a Liquid Crystalline Droplet

2021

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Photocontrollable crystallization at topological defects in a liquid crystal (LC) droplet was demonstrated. The molecules dissolved in a surfactant solution outside the LC droplet were moved into the droplet via light absorption. Nuclei emerged tens of seconds after light irradiation and moved toward the topological defect located at the droplet center, thus forming a branch-shaped crystal. This phenomenon was reproduced for multiple different molecules; photoinduced migration, nucleation, and crystal formation were discussed as a plausible mechanism.

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Illumination-Induced Solute Uptake in Liquid Crystal Droplets: The Role of 5CB Excimers

Kido,

Kusaki,

Sakai

et al. 2024

Langmuir

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This study investigates the phenomenon of solute uptake into liquid crystal (LC) droplets, illuminated under UV light, focusing on the role of 4-cyano-4′-pentylbiphenyl (5CB) excimer formation in this process. Our experiments reveal that upon UV irradiation solute molecules, including surfactants and dyes, are actively drawn into the LC phase, forming distinctive assemblies within the droplets. Contrary to previous assumptions that the uptake was driven by the direct photoreactivity of the solutes, we found that the 5CB excimer state plays a critical role for this phenomenon. This state, identifiable through its photoluminescence yet invisible to conventional UV/vis absorption spectroscopy, correlates strongly with the molecular assembly process inside of the droplets. Notably, this mechanism operates across a broad spectrum of solute molecules, from simple surfactants like sodium dodecyl sulfate (SDS) to complex dyes, demonstrating the generality of the excimer-induced solute uptake. The excimer’s role is pivotal, facilitating solute incorporation without reliance on their inherent light-absorbing properties. This insight not only advances our understanding of LC behavior under light irradiation but also opens new avenues for designing light-responsive materials.

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Photo-controllable rotational motion of cholesteric liquid crystalline droplets in a dispersion system

Abstract: A photo-controllable rotational motion was demonstrated for an isolated cholesteric liquid crystalline droplet in a surfactant solution.

Cited by 4 publications

References 35 publications

Photocontrollable Crystallization at the Topological Defect of a Liquid Crystalline Droplet

Photocontrollable Crystallization at the Topological Defect of a Liquid Crystalline Droplet

Photocontrollable Crystallization at the Topological Defect of a Liquid Crystalline Droplet

Illumination-Induced Solute Uptake in Liquid Crystal Droplets: The Role of 5CB Excimers

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