Destruction of a first-order smectic-<i>A</i>→smectic-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">C</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">*</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>phase transition by dimensional crossover in free-standing films

Kraus, Isabelle; Pierański, P.; Демихов, Е. И.; Stegemeyer, H.; Goodby, John W.

doi:10.1103/physreve.48.1916

Cited by 61 publications

(26 citation statements)

References 9 publications

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“…After preparation, the films, which showed initially domains of different thickness, were left to equilibrate (typically for about 30 min) until a homogeneous thickness was attained and any flow between the film and its meniscus came to rest. The film thickness was determined by measuring the reflection spectrum using a UV/VIS spectrometer (AvaSpec-2048-USB2, Avantes) [19].…”

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confidence: 99%

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: 99%

Single-molecule diffusion in freely suspended smectic films

2014

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“…We omitted θ 1 and θ N in <θ * >, because these surface values depend on b only through the coupling from θ 2 and θ N −1 , respectively, in the present model of Eq. (6). In practice, a remarkable deviation of the effective field, which is due to θ 1 , near the surface from the bulk relation (5) is observed in Fig.…”

Section: Results Of Numerical Analysismentioning

confidence: 78%

“…On the other hand, at a freely suspended film of C7 without the field, the jump also becomes small as a thickness of the film decreases, and eventually a critical thickness exists like the critical field in the bulk [5]. This effect due to surface layers has been confirmed at another materials [6]. A similarity and dissimilarity of effects of the external field and the surface layers are of interest [7,8].…”

Section: Introductionmentioning

confidence: 95%

Critical Point and Effective Field of Binary Ferroelectric Smectic Materials at Freely Suspended Film

2008

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Ferroelectric smectic material C7 showing the first order transition exhibits the critical point in an electric field. The critical point of the binary mixture of C7 and 10.O.4, showing the second order transition, shifts depending on concentration of 10.O.4, and disappears at certain critical concentration, i.e., the transition changes to the second order.A freely suspended film of the mixture without the field is studied, and it is found that non-uniformity due to surface layers works as the external field in the bulk. By introducing a concept of an effective field to describe the non-uniformity of the system, similarity between effects due to the surface layers in the film and those due to the field in the bulk is proved at the concentration dependence of the critical point.

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“…αHM L d 2N A ρ L k B T ), the second term in the denominator of (33) can be neglected and (27) is recovered. In that limit, the term (2D/d) in (31) can be dropped and n 1,2 are identical to the equilibrium values given by (25) and (26).…”

Section: Molecular Model For Thin Filmsmentioning

confidence: 88%

Surfaces and Interfaces of Free-Standing Smectic Films

Schüring¹,

Stannarius²

2004

Molecules in Interaction With Surfaces and Interfaces

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Abstract. Free-standing smectic films are unique fluid objects with an exceptionally large surface-to-volume ratio. They are excellently suited for studies of surface and interface properties of liquids. We describe surface tension measurements in the smectic and isotropic phases, with particular emphasis on anomalies near the phase transitions. A model that considers the excess surface entropy of ordered surface layers is applied to describe the experimental observations qualitatively and quantitatively. From the geometrical properties of isotropic droplets in free-standing films and from the forces acting on these droplets, interface tensions between the smectic and isotropic phases are derived. Finally, we report measurements of the gas permeation through smectic films and develop a model for the description of the film-thickness dependence of the permeation coefficient.

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Destruction of a first-order smectic-A→smectic-C*phase transition by dimensional crossover in free-standing films

Cited by 61 publications

References 9 publications

Single-molecule diffusion in freely suspended smectic films

Single-molecule diffusion in freely suspended smectic films

Critical Point and Effective Field of Binary Ferroelectric Smectic Materials at Freely Suspended Film

Surfaces and Interfaces of Free-Standing Smectic Films

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