Two-Dimensional Microrheology of Freely Suspended Liquid Crystal Films

Eremin, Alexey; Baumgarten, Sven; Harth, Kirsten; Stannarius, Ralf; Nguyen, Zoom; Goldfain, Aaron M.; Park, C. S.; Maclennan, Joseph E.; Glaser, Matthew A.; Clark, Noel A.

doi:10.1103/physrevlett.107.268301

Cited by 52 publications

(47 citation statements)

References 15 publications

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“…A theoretical description [2][3][4] can be obtained by taking the finite thickness of a real membrane and the coupling to the surrounding viscous medium (water or air) into account. Recently, freely suspended smectic films were successfully employed [5,6] as experimental model systems for two-dimensional fluid mechanics, confirming the predictions of [2][3][4].…”

mentioning

confidence: 67%

“…They can be easily prepared with an area of several cm 2 while their thickness can range from thousands of layers down to only two layers, corresponding to a film thickness of about 6 nm. The studies described in [5,6] were concerned with the mobility of micrometer-sized particles or inclusions in the films, mimicking to some extent the behavior of macromolecules in biological membranes. In the present study, we address the question of how the mobility of the constituent molecules themselves, which form the membrane or thin film, changes with the film thickness.…”

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confidence: 99%

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Single-molecule diffusion in freely suspended smectic films

2014

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We present a study of the molecular diffusion in freely suspended smectic-A liquid crystal films with thicknesses ranging from 20 down to only two molecular layers. The molecular mobility is directly probed by determining the trajectories of single, fluorescent tracer molecules. We demonstrate, using several different smectic compounds, that a monotonic increase of the diffusion coefficient with decreasing film thickness is a general phenomenon. In two-layer films, the diffusion is enhanced by a factor of 3 to 5 compared to the corresponding bulk smectic phase. Molecular dynamics simulations of freely suspended smectic films are presented which support the experimental results.

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confidence: 67%

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confidence: 99%

Single-molecule diffusion in freely suspended smectic films

2014

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“…The protein-composition interaction is given by Eq. (25) with c as stated in the figure and φ pin = φ 0 = 0.4. See also Movies S1 and S2 in the supplementary material.…”

Section: Selecting An Initial Conditionmentioning

confidence: 99%

“…Other physical systems are well-described as quasi-2D fluids, including lipid a) flbrown@chem.ucsb.edu monolayers, 19 colloidal particles at the air-water interface, 23 and thin films of liquid crystals. 24,25 Previously, we have developed fluctuatinghydrodynamics simulations of phase separation and lipid composition dynamics in multicomponent membranes. 26,27 This paper extends our earlier work by introducing an immersed-boundary 28,29 representation of discrete particles embedded within the membrane (e.g., proteins).…”

Section: Introductionmentioning

confidence: 99%

Fluctuating hydrodynamics of multicomponent membranes with embedded proteins

Camley

Brown

2014

The Journal of Chemical Physics

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A simulation method for the dynamics of inhomogeneous lipid bilayer membranes is presented. The membrane is treated using stochastic Saffman-Delbrück hydrodynamics, coupled to a phase-field description of lipid composition and discrete membrane proteins. Multiple applications are considered to validate and parameterize the model. The dynamics of membrane composition fluctuations above the critical point and phase separation dynamics below the critical point are studied in some detail, including the effects of adding proteins to the mixture.

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“…They are not subject to drainage or evaporation (at ambient temperatures) and air humidity is not critical. [14,15] Here, we describe a new type of experiment, related to the shape dynamics of smectic films. Another advantage is that they can be studied as one-component systems.…”

Section: Thin Fluid Filmsmentioning

confidence: 99%

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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Two-Dimensional Microrheology of Freely Suspended Liquid Crystal Films

Cited by 52 publications

References 15 publications

Single-molecule diffusion in freely suspended smectic films

Single-molecule diffusion in freely suspended smectic films

Fluctuating hydrodynamics of multicomponent membranes with embedded proteins

Freely Floating Smectic Films

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