Rim instability of bursting thin smectic films

Trittel, Torsten; John, Thomas; Tsuji, Kinko; Stannarius, Ralf

doi:10.1063/1.4807377

Cited by 11 publications

(13 citation statements)

References 36 publications

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“…For example, the use of smectic FSFs facilitates the study of the coupling between director and flow fields in quasi-2D fluids [10,11] and of the formation of spontaneous patterns. The rupture of sessile smectic bubbles on a capillary has been analyzed using high-speed optical imaging [40][41][42] and compared to models for the rupture of thin fluid sheets. [14,15] Here, we describe a new type of experiment, related to the shape dynamics of smectic films.…”

Section: Thin Fluid Filmsmentioning

confidence: 99%

“…Almost all thin films had burst within 10 ms after pinch-off. The relationship between rim velocity and film thickness in bursting smectic bubbles supported on a capillary has been investigated in detail by Trittel et al [42] The tendency for smectic A bubbles to burst increases in thinner bubbles, not only because thick films are more robust, but also because oscillations of thin bubbles with lower membrane mass are faster. In this phase, the film almost inevitably breaks because of in-plane stress.…”

Section: Rupture Of Smectic a Bubblesmentioning

confidence: 99%

“…In technological processes such as coating, or spraying of liquids, particularly for aerosols, the rupture dynamics of thin bubbles can play a significant role. [28][29][30][31][32] Smectic bubbles in air, supported by a capillary, [33][34][35][36][37][38][39][40][41][42] in foams, [43] or on a flat surface [44,45] have been studied. Surface tension measurements, [34,37] electric field effects [35,45] and gas permeation through thin films [38,44] were among the topics of interest.…”

Section: Thin Fluid Filmsmentioning

confidence: 99%

“…Surface tension measurements, [34,37] electric field effects [35,45] and gas permeation through thin films [38,44] were among the topics of interest. The rupture of sessile smectic bubbles on a capillary has been analyzed using high-speed optical imaging [40][41][42] and compared to models for the rupture of thin fluid sheets. [46,47] The study of Caillier and Oswald [39] is particularly relevant for the present study, because it relates film area reductions to reorganization processes of smectic layers in the film.…”

Section: Thin Fluid Filmsmentioning

confidence: 99%

“…density of the smectic material 1 sm % 10 3 kg m À3 , and the film tension S = 2 s. The thickness of the bubble shown in Figure 3 is of the order of 100 nm, and the rim velocity is approximately 14 m s À1 . The relationship between rim velocity and film thickness in bursting smectic bubbles supported on a capillary has been investigated in detail by Trittel et al [42] The tendency for smectic A bubbles to burst increases in thinner bubbles, not only because thick films are more robust, but also because oscillations of thin bubbles with lower membrane mass are faster. The dynamics of thick bubbles are in general slower, caused by film viscosity and layer reorganizations in the film.…”

Section: Rupture Of Smectic a Bubblesmentioning

confidence: 99%

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Freely Floating Smectic Films

et al. 2014

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We have investigated the dynamics of freely floating smectic bubbles using high-speed optical imaging. Bubbles in the size range from a few hundred micrometers to several centimeters were prepared from collapsing catenoids. They represent ideal model systems for the study of thin-film fluid dynamics under well-controlled conditions. Owing to the internal smectic layer structure, the bubbles combine features of both soap films and vesicles in their unique shape dynamics. From a strongly elongated initial shape after pinch-off, they relax towards the spherical equilibrium, first by a slow redistribution of the smectic layers, and finally by weak, damped shape oscillations. In addition, we describe the rupture of freely floating smectic bubbles, and the formation and stability of smectic filaments.

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Section: Thin Fluid Filmsmentioning

confidence: 99%

Section: Rupture Of Smectic a Bubblesmentioning

confidence: 99%

Section: Thin Fluid Filmsmentioning

confidence: 99%

Section: Thin Fluid Filmsmentioning

confidence: 99%

Section: Rupture Of Smectic a Bubblesmentioning

confidence: 99%

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Freely Floating Smectic Films

et al. 2014

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Cholesteric Spherical Reflectors with Tunable Color from Single‐Domain Cellulose Nanocrystal Microshells

Geng,

Honorato‐Rios,

Noh

et al. 2023

Advanced Materials

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The wavelength‐ and polarization‐selective Bragg reflection of visible light exhibited by films produced by drying cholesteric liquid crystal (CLC) suspensions of cellulose nanocrystals (CNCs) render these biosourced nanoparticles highly potent for many optical applications. While the conventionally produced films are flat, the CLC‐derived helical CNC arrangement would acquire new powerful features if given spherical curvature. Drying CNC suspension droplets does not work, because the onset of kinetic arrest in droplets of anisotropic colloids leads to severe buckling and loss of spherical shape. Here these problems are avoided by confining the CNC suspension in a spherical microshell surrounding an incompressible oil droplet. This prevents buckling, ensures strong helix pitch compression, and produces single‐domain cholesteric spherical reflector particles with distinct visible color. Interestingly, the constrained shrinkage leads to spontaneous puncturing, leaving every particle with a single hole through which the inner oil phase can be extracted for recycling. By mixing two different CNC types at varying fractions, the retroreflection color is tuned throughout the visible spectrum. The new approach adds a versatile tool in the quest to utilize bioderived CLCs, enabling spherically curved particles with the same excellent optical quality and smooth surface as previously obtained only in flat films.This article is protected by copyright. All rights reserved

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Taylor–Culick retractions and the influence of the surroundings

et al. 2022

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When a freely suspended liquid film ruptures, it retracts spontaneously under the action of surface tension. If the film is surrounded by air, the retraction velocity is known to approach the constant Taylor–Culick velocity. However, when surrounded by an external viscous medium, the dissipation within that medium dictates the magnitude of the retraction velocity. In the present work, we study the retraction of a liquid (water) film in a viscous oil ambient (two-phase Taylor–Culick retractions), and that sandwiched between air and a viscous oil (three-phase Taylor–Culick retractions). In the latter case, the experimentally measured retraction velocity is observed to have a weaker dependence on the viscosity of the oil phase as compared with the configuration where the water film is surrounded completely by oil. Numerical simulations indicate that this weaker dependence arises from the localization of viscous dissipation near the three-phase contact line. The speed of retraction only depends on the viscosity of the surrounding medium and not on that of the film. From the experiments and the numerical simulations, we reveal unprecedented regimes for the scaling of the Weber number ${We}_{f}$ of the film (based on its retraction velocity) or the capillary number ${Ca}_{s}$ of the surroundings versus the Ohnesorge number ${Oh}_{s}$ of the surroundings in the regime of large viscosity of the surroundings ( ${Oh}_{s} \gg 1$ ), namely ${We}_{f} \sim {Oh}_{s}^{-2}$ and ${Ca}_{s} \sim {Oh}_{s}^{0}$ for the two-phase Taylor–Culick configuration, and ${We}_{f} \sim {Oh}_{s}^{-1}$ and ${Ca}_{s} \sim {Oh}_{s}^{1/2}$ for the three-phase Taylor–Culick configuration.

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Rim instability of bursting thin smectic films

Cited by 11 publications

References 36 publications

Freely Floating Smectic Films

Freely Floating Smectic Films

Cholesteric Spherical Reflectors with Tunable Color from Single‐Domain Cellulose Nanocrystal Microshells

Taylor–Culick retractions and the influence of the surroundings

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