Single-molecule diffusion in freely suspended smectic films

Schulz, Benjamin; Mazza, Marco G.; Bahr, Christian

doi:10.1103/physreve.90.040501

Cited by 17 publications

(16 citation statements)

References 36 publications

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“…The calculated data on D b (N = 25), at T = 367 K (θ = 0.67) and d = 3.26 nm [55], for 25-layer partially fluorinated H10F5MOPP smectic film, gives ∼ 6 µm 2 /s. In turn, the experimentally obtained data on D b (N) (N = 25, 13, 11, 10), for 25-layer smectic film composed of 4-octyl-4 -cyanobiphenyl molecules, gives ∼ 3 µm 2 /s [56,57]. Hence, it has been obtained a good agreement between the theoretically predicted [53] and experimentally obtained [55] results."…”

Section: Translational and Orientational Diffusion Across The Smecticsupporting

confidence: 66%

Structural, Optical and Dynamic Properties of Thin Smectic Films

S̀liwa

Захаров

2020

Crystals

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The problem of predicting structural and dynamic behavior associated with thin smectic films, both deposited on a solid surface or stretched over an opening, when the temperature is slowly increased above the bulk transition temperature towards either the nematic or isotropic phases, remains an interesting one in the physics of condensed matter. A useful route in studies of structural and optical properties of thin smectic films is provided by a combination of statistical–mechanical theories, hydrodynamics of liquid crystal phases, and optical and calorimetric techniques. We believe that this review shows some useful routes not only for the further examining of the validity of a theoretical description of thin smectic films, both deposited on a solid surface or stretched over an opening, but also for analyzing their structural, optical, and dynamic properties.

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Section: Translational and Orientational Diffusion Across The Smecticsupporting

confidence: 66%

Structural, Optical and Dynamic Properties of Thin Smectic Films

S̀liwa

Захаров

2020

Crystals

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“…Computer simulations on LCs in thin film and pore geometry can give here important complementary insights [13,24,[41][42][43][44][45][46][47][48][49][50]. These studies indicate pronounced spatial heterogeneities, in particular interface-induced molecular layering and radial gradients both in the orientational order and reorientational dynamics in cylindrical pore geometry [51].…”

Section: Fig 1: (Color Online)mentioning

confidence: 99%

Inhomogeneous relaxation dynamics and phase behaviour of a liquid crystal confined in a nanoporous solid

et al. 2015

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We report filling-fraction dependent dielectric spectroscopy measurements on the relaxation dynamics of the rod-like nematogen 7CB condensed in 13 nm silica nanochannels. In the film-condensed regime, a slow interface relaxation dominates the dielectric spectra, whereas from the capillarycondensed state up to complete filling an additional, fast relaxation in the core of the channels is found. The temperature-dependence of the static capacitance, representative of the averaged, collective molecular orientational ordering, indicates a continuous, paranematic-to-nematic (P-N) transition, in contrast to the discontinuous bulk behaviour. It is well described by a Landau-deGennes free energy model for a phase transition in cylindrical confinement. The large tensile pressure of 10 MPa in the capillary-condensed state, resulting from the Young-Laplace pressure at highly curved liquid menisci, quantitatively accounts for a downward-shift of the P-N transition and an increased molecular mobility in comparison to the unstretched liquid state of the complete filling. The strengths of the slow and fast relaxations provide local information on the orientational order: The thermotropic behaviour in the core region is bulk-like, i.e. it is characterized by an abrupt onset of the nematic order at the P-N transition. By contrast, the interface ordering exhibits a continuous evolution at the P-N transition. Thus, the phase behaviour of the entirely filled liquid crystal-silica nanocomposite can be quantitatively described by a linear superposition of these distinct nematic order contributions.

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“…On the one hand, at a low molar fraction of spheres (x s = 0.01) the study basically explores the diffusion of isolated spheres in the smectic fluid of rods. Some fruitful incursions into the transport properties of this limiting case, in which the spheres can essentially be considered to be a tracer, have been performed in previous studies [25][26][27][28][29][30][31]. On the other hand, at the highest molar fraction of spheres included in our study (x s = 0.5), a lamellar phase is formed that is characterized by alternate layers of rods and spheres, and the fluid presents novel features with respect to the pure rod fluid.…”

Section: Introductionmentioning

confidence: 99%

Transport of spherical colloids in layered phases of binary mixtures with rod-like particles

2015

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The transport properties of colloids in anisotropic media constitute a general problem of fundamental interest in experimental sciences, with a broad range of technological applications. This work investigates the transport of soft spherical colloids in binary mixtures with rod-like particles by means of Monte Carlo and Brownian Dynamics simulations. Layered phases are considered, that range from smectic phases to lamellar phases, depending on the molar fraction of the spherical particles. The investigation serves to characterize the distinct features of transport within layers versus those of transport across neighboring layers, both of which are neatly differentiated. The insertion of particles into layers and the diffusion across them occur at a smaller rate than the intralayer diffusion modulated by the formation of transitory cages in its initial stages. Collective events, in which two or more colloids diffuse across layers in a concerted way, are described as a non-negligible process in these fluids.

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Single-molecule diffusion in freely suspended smectic films

Cited by 17 publications

References 36 publications

Structural, Optical and Dynamic Properties of Thin Smectic Films

Structural, Optical and Dynamic Properties of Thin Smectic Films

Inhomogeneous relaxation dynamics and phase behaviour of a liquid crystal confined in a nanoporous solid

Transport of spherical colloids in layered phases of binary mixtures with rod-like particles

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