Patrick Oswald
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View article: TIC Reorientation under Electric and Magnetic Fields in Homeotropic Samples of Cholesteric LC with Negative Dielectric Anisotropy
TIC Reorientation under Electric and Magnetic Fields in Homeotropic Samples of Cholesteric LC with Negative Dielectric Anisotropy Open
In this paper, we numerically and experimentally show that the director field orientation degeneracy within the Translationally Invariant Configuration (TIC) of a cholesteric liquid crystal under an electric field can be lifted by imposing…
View article: Structure and Lehmann rotation of drops in a surfactant-doped bent-core liquid crystal
Structure and Lehmann rotation of drops in a surfactant-doped bent-core liquid crystal Open
The structure of the nematic (cholesteric) drops that form at the clearing temperature of a mixture of the bent-core molecule CB7CB and the rodlike molecule 8CB doped with a surfactant is optically determined. Using experimental observatio…
View article: Heliconical-fluctuation-induced compensation point in the diluted cholesteric phase of mixtures containing the flexible dimer CB7CB
Heliconical-fluctuation-induced compensation point in the diluted cholesteric phase of mixtures containing the flexible dimer CB7CB Open
We show experimentally and theoretically that the heliconical fluctuations that develop in a cholesteric phase (Ch) close to a transition to a chiral twist-bend nematic phase (N_{TB}) may lead to the appearance of a compensation point. At …
View article: Comment on the Determination of the Polar Anchoring Energy by Capacitance Measurements in Nematic Liquid Crystals
Comment on the Determination of the Polar Anchoring Energy by Capacitance Measurements in Nematic Liquid Crystals Open
Capacitance measurements have been extensively used to measure the anchoring extrapolation length L at a nematic–substrate interface. These measurements are extremely delicate because the value found for L often critically depends on the s…
View article: Comment on the Determination of the Polar Anchoring Energy by Capacitance Measurements in Nematic Liquid Crystals
Comment on the Determination of the Polar Anchoring Energy by Capacitance Measurements in Nematic Liquid Crystals Open
Capacitance measurements have been extensively used to measure the anchoring extrapolation length L at a nematic-substrate interface. These measurements are extremely delicate because the value found for L often critically depends on the s…
View article: Dynamics of Dislocations in Smectic A Liquid Crystals Doped with Nanoparticles
Dynamics of Dislocations in Smectic A Liquid Crystals Doped with Nanoparticles Open
Edge dislocations are linear defects that locally break the positional order of the layers in smectic A liquid crystals. As in usual solids, these defects play a central role for explaining the plastic properties of the smectic A phase. Th…
View article: Modeling a photoinduced planar-to-homeotropic anchoring transition triggered by surface azobenzene units in a nematic liquid crystal
Modeling a photoinduced planar-to-homeotropic anchoring transition triggered by surface azobenzene units in a nematic liquid crystal Open
The performance of light-controlled liquid crystal anchoring surfaces depends on the nature of the photosensitive moieties and on the concentration of spacer units. Here, we study the kinetics of photosensitive liquid crystal cells that in…
View article: Continuous Rotation of Achiral Nematic Liquid Crystal Droplets Driven by Heat Flux
Continuous Rotation of Achiral Nematic Liquid Crystal Droplets Driven by Heat Flux Open
Suspended droplets of cholesteric (chiral nematic) liquid crystals spontaneously rotate in the presence of a heat flux due to a temperature gradient, a phenomenon known as the Lehmann effect. So far, it is not clear whether this effect is …