Mixtures of Blue Phase Liquid Crystal with Simple Liquids: Elastic Emulsions and Cubic Fluid Cylinders

Lintuvuori, Juho S.; Stratford, Kevin; Cates, Michael E.; Marenduzzo, Davide

doi:10.1103/physrevlett.121.037802

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…We hope that our results will stimulate experiments, e.g., with stabilized oil-in-water or water-in-oil emulsions, to directly test our predictions on the scaling of f c and on the importance of permeation for the yielding transition. To assess the universality of our results, one could investigate the yielding transition in other materials, such as biological tissues (33,49,50), red blood cell suspensions (51), and liquid crystalline emulsions (52)(53)(54)(55). It would also be of interest to revisit the foam limit considered in previous literature (7,8) to quantify permeation there and to ask whether the nonconserved and conserved model are fundamentally distinct in that limit as well.…”

Section: Discussionmentioning

confidence: 99%

Yield-stress transition in suspensions of deformable droplets

et al. 2023

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Yield-stress materials, which require a sufficiently large forcing to flow, are currently ill-understood theoretically. To gain insight into their yielding transition, we study numerically the rheology of a suspension of deformable droplets in 2D. We show that the suspension displays yield-stress behavior, with droplets remaining motionless below a critical body-force. In this phase, droplets jam to form an amorphous structure, whereas they order in the flowing phase. Yielding is linked to a percolation transition in the contacts of droplet-droplet overlaps and requires strict conservation of the droplet area to exist. Close to the transition, we find strong oscillations in the droplet motion that resemble those found experimentally in confined colloidal glasses. We show that even when droplets are static, the underlying solvent moves by permeation so that the viscosity of the composite system is never truly infinite, and its value ceases to be a bulk material property of the system.

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Section: Discussionmentioning

confidence: 99%

Yield-stress transition in suspensions of deformable droplets

et al. 2023

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“…For instance, numerical calculations indicate that the coexistence system of the optically chiral and isotropic blue phase liquid crystal (BPLC) and the common optically achiral and isotropic liquid exhibits specific physical and morphology behaviors deriving from the contest between interfacial and elastic energies at different length scales. [ 19 ] Experimentally, small droplets of BPLC in deionized water show significantly different phase behaviors as compared with their bulk counterpart and the defect structure, reflection color, and morphology can be manipulated by adjusting the interfacial parameters such as the droplet size and anchoring conditions. [ 20,21 ] In addition, tunable and omnidirectional micro‐cavity for generating a fantastic laser emission was obtained by dispersing the cholesteric LC in glycerol as microdroplets.…”

Section: Figurementioning

confidence: 99%

Reversible On–Off of Chirality and Anisotropy in Patterned Coexistence of Achiral‐Anisotropic and Chiral‐Isotropic Soft Materials

Liu

Huang

et al. 2020

Advanced Optical Materials

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Achieving a coexistence of two or multiple phases of soft matters via a delicate trade‐off of free energy and long‐range order with one another has been inspiring abundant interest on fundamental sciences and engineering. In this work, a stable coexistence of the optically achiral‐anisotropic liquid crystalline nematic phase and the optically chiral‐isotropic liquid crystalline blue phase is proposed and demonstrated, with their distribution tailored in a micro‐pattern by the developed localized micro‐regional polymer templating technique. Such a stable patterned coexistence of the two different phases with a distinct molecular arrangement, optical chirality, and anisotropy is achieved depending on a delicate matching of the elastic energy on the interface between liquid crystals and polymer networks. In contrast to the majority of soft coexistence systems, a specific dynamic and reversible on–off response of chirality and anisotropy is observed in such a system driven by an electric field. The structure of patterned coexistence system in the presence and absence of external stimulation is explored by microscopy and optical technique, and furthermore, the prospective photonic applications are demonstrated. This investigation indicates another category of functional soft material with fantastic adaptive characteristics for application in optics, electronics, interface physics, and chemistry.

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“…We hope that our results will stimulate experiments to directly test our predictions, such as the importance of permeation and the scaling of f c . To assess the universality of our results, one could investigate the yielding transition in other materials, such as biological tissues [32][33][34], red blood cell suspensions [35], and liquid crystalline emulsions [36].…”

mentioning

confidence: 99%

Yield-stress transition in suspensions of deformable droplets

Negro¹,

Carenza²,

Gonnella³

et al. 2022

Preprint

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Yield-stress materials, which require a sufficiently large forcing to flow, are currently ill-understood theoretically. To gain insight into their yielding transition, here we study numerically the rheology of a suspension of deformable droplets under pressure-driven flow. We show that the suspension displays yield-stress behaviour, with the droplets remaining motionless when the applied body-force is below a critical value. In the non-flowing phase, droplets jam to form an amorphous structure, whereas they order in the flowing phase. Yielding is linked to a percolation transition in the contacts of droplet-droplet overlaps, and requires suitable wetting boundary conditions and strict conservation of the droplet area to exist. Close to the yielding transition, we find strong oscillations in the droplet motion which closely resemble those found experimentally in confined colloidal glasses under flow. We show that even when droplets are static the underlying solvent moves by permeation, so that the viscosity of the composite system is never truly infinite, and, as we discuss, its precise value ceases to be a bulk material property of the system.

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Mixtures of Blue Phase Liquid Crystal with Simple Liquids: Elastic Emulsions and Cubic Fluid Cylinders

Cited by 8 publications

References 32 publications

Yield-stress transition in suspensions of deformable droplets

Yield-stress transition in suspensions of deformable droplets

Reversible On–Off of Chirality and Anisotropy in Patterned Coexistence of Achiral‐Anisotropic and Chiral‐Isotropic Soft Materials

Yield-stress transition in suspensions of deformable droplets

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