Surface tensions of smectic liquid crystals

Schüring, H.; Thieme, C.; Stannarius, Ralf

doi:10.1080/02678290010006270

Cited by 45 publications

(44 citation statements)

References 34 publications

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“…Open and solid symbols are data from two different samples A similar monotonic decrease of surface tension with temperature is characteristic, for the standard material 8CB (4-N-octyl-4 -cyanobiphenyl) in the SmA phase, for example. The absolute value of σ is considerably higher than for DOBAMBC [70]. The mean value of σ ≈ 27.4 × 10 −3 N/m again fits into the values of the classification given by Mach et al Molecules of the material 8CB, possess only one alkyl chain; a polar terminal cyano group is substituted instead of the second alkyl chain.…”

Section: Temperature Dependence and The Role Of Phase Transitionssupporting

confidence: 56%

“…• [70]. Open and solid symbols are data from two different samples A similar monotonic decrease of surface tension with temperature is characteristic, for the standard material 8CB (4-N-octyl-4 -cyanobiphenyl) in the SmA phase, for example.…”

Section: Temperature Dependence and The Role Of Phase Transitionsmentioning

confidence: 93%

“…Another aspect is the investigation of the surface tension in the vicinity of liquid-liquid phase transitions. Deviations from the normal temperature dependence, (2), connected with entropic contributions to the surface tension can be observed [70].…”

Section: Surface and Interface Tensions Of Thin Smectic Filmsmentioning

confidence: 95%

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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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Section: Temperature Dependence and The Role Of Phase Transitionssupporting

confidence: 56%

Section: Temperature Dependence and The Role Of Phase Transitionsmentioning

confidence: 93%

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Surfaces and Interfaces of Free-Standing Smectic Films

Schüring¹,

Stannarius²

2004

Molecules in Interaction With Surfaces and Interfaces

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“…This experiment was already performed by one of us (PO) almost twenty years ago [13]. It provided us with a method to measure the film tension, which was then widely used and improved by Stannarius et al [14][15][16] to measure and compare the film tensions of various compounds. The experiment also showed that the smectic dissipates energy when the bubble collapses.…”

Section: Introductionmentioning

confidence: 99%

Collapse dynamics of smectic-A bubbles

Caillier

Oswald

2006

Eur. Phys. J. E

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“…Further we assume a surface tension of 0.02 N/m (σ of similar materials are found in Refs. [23,24]), and arrive at capillary forces of 6.1 µN (a) and 9.7 µN (b), resp. (dashed lines).…”

Section: Introductionmentioning

confidence: 99%

Tension of freely suspended fluid filaments

et al. 2012

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Stable fluid filaments with diameters of several micrometers and slenderness ratios well above 1000 are unique objects formed by some liquid crystalline phases of bent-core mesogens. We present a technique to determine filament tensions from their deflection under defined loads. A strong temperature dependence is observed, with a minimum near the clearing temperature. Both the nonlinear relation between filament tension and diameter and the substantial increase of the tension with lower temperatures indicate contributions of volume terms, in addition to surface capillary forces. We discuss a model that relates these bulk terms to elastic forces, originating from the undulated smectic layer structure. This model can explain the origin of the filament stability.

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Surface tensions of smectic liquid crystals

Cited by 45 publications

References 34 publications

Surfaces and Interfaces of Free-Standing Smectic Films

Surfaces and Interfaces of Free-Standing Smectic Films

Collapse dynamics of smectic-A bubbles

Tension of freely suspended fluid filaments

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