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1,689 Newest Publications about the topic liquid crystals

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Splay–density coupling in semiflexible main-chain nematic polymers with hairpins

03-Jul-2018 | Aleksandar Popadić; Daniel Svenšek; Rudolf Podgornik; Kostas Daoulas; Matej Praprotnik, Soft Matter, 2018

A main-chain nematic polymer melt/solution exhibits macroscopic orientational order of main polymer chains, i.e., a preferred (nematic) direction. It has long been known that in such polymeric liquid crystals spatial density/concentration variations and distortions of the nematic direction are ...

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On the impact of linking groups in hydrogen-bonded liquid crystals – a case study

26-Jun-2018 | Michael Pfletscher; Markus Mezger; Michael Giese, Soft Matter, 2018

The impact of the linking group in hydrogen-bonded liquid crystals is systematically studied by a modular approach. POM and DSC results exhibited tremendous differences in the mesomorphic behaviour of the assemblies, due to the versatile linkages of the side chains, which were correlated with ...

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Magnetic field effects in nematic and smectic liquid crystals probed by time resolved observation of orientation relaxation of the spin probe.

20-Jun-2018 | Alexey V. Bogdanov; Gleb I. Proniuk; Andrey Kh. Vorobiev, Physical Chemistry Chemical Physics, 2018

The kinetics of reorientation of liquid crystal HOPOOB in nematic and smectic phases in the magnetic field was studied by spin probe technique. The time evolution of the EPR spectrum shape in the course of reorientation in nematic phase indicates that the mechanism of alignment comprises ...

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Encapsulating propeller-like columnar liquid crystals with an aromatic outer shell: influence of phenoxy-terminated side chains on the phase behaviour of triphenylbenzenes

20-Jun-2018 | Korinna Bader; Tobias Wöhrle; Esra Öztürk; Angelika Baro; Sabine Laschat, Soft Matter, 2018

Tailoring of phase transition temperatures of columnar liquid crystals by side chain variation is often associated by an undesired change of mesophase type and/or geometry. To overcome this problem phenoxy-terminated side chains rather than alkyl side chains were grafted to triphenylbenzenes, ...

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Structural and rheological changes of lamellar liquid crystals as a result of compositional changes and added silica nanoparticles

12-Jun-2018 | Joshua B. Marlow; Matthew J. Pottage; Thomas M. McCoy; Liliana De Campo; Anna Sokolova; Toby D. M. Bell; Rico F. Tabor, Physical Chemistry Chemical Physics, 2018

Lamellar liquid crystals comprising oil, water and surfactant(s) were formulated and analysed in order to examine how these materials responded to the inclusion of inorganic nanoparticles, in terms of their structural and rheological characteristics. Lamellar phases were formed from mixtures of ...

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Surface induced twist in nematic and chiral nematic liquid crystals: stick-slip-like and constrained motion

30-May-2018 | R. F. de Souza; E. K. Lenzi; R. T. de Souza; L. R. Evangelista; Q. Li; R. S. Zola, Soft Matter, 2018

Surface driven pattern formation is an intriguing phenomenon in the liquid crystal field. Owing to its ability to transmit torque, one can generate different patterns by propagating distortions on the optical wavelength scale in the sample from the surface. Here, we theoretically investigate ...

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Phase behaviours of a cationic surfactant in deep eutectic solvents: from micelles to lyotropic liquid crystals

29-May-2018 | Qintang Li; Jiao Wang; Nana Lei; Minhao Yan; Xiao Chen; Xiu Yue, Physical Chemistry Chemical Physics, 2018

In recent years, aggregates formed in deep eutectic solvents (DESs), especially micelles, have attracted much attention. In this study, the phase behaviours of a cationic surfactant, cetylpyridinium bromide (CPBr), in two DESs, choline chloride + glycerol (ChG) and choline chloride + ethylene ...

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Heterogeneous Microwave-assisted Ullmann type Methodology for Synthesis of Rigid-core Ionic Liquid Crystals.

29-May-2018 | Julien Fouchet; Benoît Heinrich; Matthieu L'Her; Emilie Voirin; Lydia Karmazin; Corinne Bailly; Richard Wel ..., New Journal of Chemistry, 2018

We present an efficient Ullmann-type synthesis methodology enabling the preparation of imidazolium compounds with an extended aromatic core in three steps. This procedure begins with a microwave-assisted, heterogeneously catalysed cross-coupling reaction in the presence of Cu(II)-doped NaY ...

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Dynamics and ionic conductivity of ionic liquid crystals forming a hexagonal columnar mesophase

29-May-2018 | Arda Yildirim; Paulina Szymoniak; Kathrin Sentker; Martin Butschies; Andrea Bühlmeyer; Patrick Huber; Sabine La ..., Physical Chemistry Chemical Physics, 2018

For the first time, the molecular mobility of two linear-shaped tetramethylated guanidinium triflate ionic liquid crystals (ILCs) having different lengths of alkyl chains was investigated using a combination of broadband dielectric spectroscopy (BDS) and specific heat spectroscopy (SHS). By ...

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Tuning the phase transition temperature of ferronematics with a magnetic field

28-May-2018 | Tibor Tóth-Katona; Veronika Gdovinová; Natália Tomašovičová; Nándor Éber; Katalin Fodo ..., Soft Matter, 2018

The influence of magnetic field on the isotropic-to-nematic phase transition temperature is investigated in neat bent-core and calamitic liquid crystals, in their mixture, and in samples doped with spherical magnetic nanoparticles for two different orientations of the magnetic field. A ...

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