Zerihun Workineh
June 3rd, 2011
International School on Modeling and Computer Simulation Methods for Dendrimers
An international school on “Modeling and Computer Simulation Methods for Dendrimers” will be held in the University of Patras, Department of Materials Science from 12 to 15 December 2011
Updated information and program here
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PRE: Liq. Cryst.
- Harmonic field in knotted spaceAuthor(s): Xiuqing Duan and Zhenwei YaoKnotted fields enrich a variety of physical phenomena, ranging from fluid flows, electromagnetic fields, to textures of ordered media. Maxwell's electrostatic equations, whose vacuum solution is mathematically known as a harmonic field, provide an ideal setting to explore the role of domain topology...[Phys. Rev. E […]
- Calculation of gyrotropy coefficients in media with low-pitch helical structuresAuthor(s): H. Dhaouadi, F. Trabelsi, O. Riahi, and T. OthmanChiral smectic liquid crystals are known for their huge optical activity due to the precession of the anisotropic dielectric tensor around the helicoidal axis. For an oblique direction of the propagating wave, the helix acts as a grating which splits an incident beam in different directions as long […]
- Defect transitions in nematic liquid-crystal capillary bridgesAuthor(s): Perry W. Ellis, Shengnan Huang, Susannah Klaneček, Jayalakshmi Vallamkondu, Edward Dannemiller, Mark Vernon, Ya-wen Chang, Paul M. Goldbart, and Alberto Fernandez-NievesWe use experiment and computational modeling to understand the defect structure and director configuration in a nematic liquid crystal capillary bridge confined between two paralle […]
- Effects of monoclinic symmetry on the properties of biaxial liquid crystalsAuthor(s): Nikita V. Solodkov, Mamatha Nagaraj, and J. Cliff JonesTilted smectic liquid crystal phases such as the smectic-C phase seen in calamitic liquid crystals are usually treated using the assumption of biaxial orthorhombic symmetry. However, the smectic-C phase has monoclinic symmetry, thereby allowing disassociation of the principal optic and dielect […]
- Biaxial potential of surface-stabilized ferroelectric liquid crystalsAuthor(s): Anatoly Kaznacheev, Evgeny Pozhidaev, Vladimir Rudyak, Alexander V. Emelyanenko, and Alexei KhokhlovA biaxial surface potential ${\mathrm{Φ}}_{s}$ of smectic-${C}^{*}$ surface-stabilized ferroelectric liquid crystals (SSFLCs) is introduced in this paper to explain the experimentally observed electric-field dependence of polarization ${\stackrel{̃} […]
- Impact of spherical nanoparticles on nematic order parametersAuthor(s): C. Kyrou, S. Kralj, M. Panagopoulou, Y. Raptis, G. Nounesis, and I. LelidisWe study experimentally the impact of spherical nanoparticles on the orientational order parameters of a host nematic liquid crystal. We use spherical core-shell quantum dots that are surface functionalized to promote homeotropic anchoring on their interface with the liquid […]
- Electroclinic effect in the chiral lamellar $α$ phase of a lyotropic liquid crystalAuthor(s): Marc D. Harjung and Frank GiesselmannIn thermotropic chiral $\mathrm{Sm}\text{−}{A}^{*}$ phases, an electric field along the smectic layers breaks the ${D}_{∞}$ symmetry of the $\mathrm{Sm}\text{−}{A}^{*}$ phase and induces a tilt of the liquid crystal director. This so-called electroclinic effect (ECE) was first reported by Garoff and...[Phys. Re […]
- Director gliding in a nematic liquid crystal layer: Quantitative comparison with experimentsAuthor(s): E. Mema, L. Kondic, and L. J. CummingsThe interaction between nematic liquid crystals and polymer-coated substrates may lead to slow reorientation of the easy axis (so-called “director gliding”) when a prolonged external field is applied. We consider the experimental evidence of zenithal gliding observed by Joly et al. [Phys. Rev. E 70,...[Phys. R […]
- Tunable hybrid optical modes in a bounded cholesteric liquid crystal with a twist defectAuthor(s): Maxim V. Pyatnov, Stepan Ya. Vetrov, and Ivan V. TimofeevCoupling between the defect mode of a cholesteric liquid crystal and the localized mode of a cholesteric liquid crystal–phase plate–metal structure is theoretically demonstrated. It is shown that the transmittance spectrum can be tuned by changing the twist-defect angle and helix pitch, whic […]
- $N\text{−}\mathrm{Sm}A\text{−}\mathrm{Sm}C$ phase transitions probed by a pair of elastically bound colloidsAuthor(s): Muhammed Rasi M, K. P. Zuhail, Arun Roy, and Surajit DharaThe competing effect of surface anchoring of dispersed microparticles and elasticity of nematic and cholesteric liquid crystals has been shown to stabilize a variety of topological defects. Here we study a pair of colloidal microparticles with homeotropic and planar surface anchoring across […]