Special Issue "Ferroelectric and Ferromagnetic Liquid Crystals"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Liquid Crystals".

Deadline for manuscript submissions: 30 September 2019.

Special Issue Editor

Guest Editor
Prof. Alexander V. Emelyanenko Website E-Mail
Lomonosov Moscow State University, Moscow, Russian Federation
Interests: liquid crystals; composites; phase transitions; memory effects; molecular-statistical physics

Special Issue Information

Dear Colleagues,

Ferroelectric and ferromagnetic liquid crystals (FLC) are smart materials with numerous structural puzzles that may one day be applied to industry. They are extremely useful, because they have a several-orders-of-magnitude-higher response time than traditional liquid crystals used in displays. For example, the field sequential colour technique could be potentially used for the creation of the full colour displays based on FLC, in which an arbitrary colour could be obtained as a red-green-blue (RGB) average over the time in each pixel and not over the space of three sub-pixels. The FLC displays could therefore have better resolution, brightness, and colour gamuts.         

Manipulation by FLC structures requires lower energy consumption. The structures of many ferroelectric and ferromagnetic phases are easily memorized. FLC materials can be multistable, and therefore the memorisable greyscale can also be organized on the level of a single pixel. As a result, high-resolution images can be memorized using FLC materials for an infinite period of time (until the new image is rewritten by the new energy pulse).    

The staircases of intermediate phases observed in the temperature interval between ferroelectric and antiferroelectric liquid crystal phases provide a great field for new inventions. The non-trivial structural organization of complex FLC phases provides the existence of several switchable states at different values of electric field. The existence of two kinds of periodicity in the intermediate phases (one at nano-scale and another one at micro-scale) provides a correlation between the micro and nano-structures, and therefore the nano-world can be potentially visualized by FLC materials. This could be very important for sensing devices, for example.     

Finally, the FLC materials are brilliant materials for investigation of the matter creation in general, because they have are highly organized but, at the same time, are fluids in nature. This combination of properties makes them very useful materials for the investigation of micro-droplets creation, coalescence, and collective behaviour. These processes are very important for oil-recovery, food production, and cosmetics. They are actively studied in the microgravity conditions, in particular, at the International Space Station.

The potential topics include, but, again, are not limited to, the following:

  • Novel FLC Phases, Structure, and Phase Behaviour
  • Design and Synthesis of FLC Materials
  • Photonic, Electro-, and Photo-Responsive FLC Systems
  • Theory and Simulations of FLC Systems
  • Hybrid and Nanostructured FLC Systems
  • Antiferroelectric, Intermediate, and Re-Entrant Phases
  • Memory Effects in FLC Materials
  • Confined FLC Systems and Defects
  • Self-Assembling of FLC Materials
  • Applications of Ferroelectric and Ferromagnetic Liquid Crystals

Prof. Alexander V. Emelyanenko
Guest Editor

Manuscript Submission Information

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Keywords

  • ferroelectric and ferromagnetic liquid crystals
  • polarity and chirality
  • memory effects
  • self-assembling

Published Papers (2 papers)

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Research

Open AccessArticle
Dielectric Properties of Chiral Ferroelectric Liquid Crystalline Compounds with Three Aromatic Rings Connected by Ester Groups
Crystals 2019, 9(9), 473; https://doi.org/10.3390/cryst9090473 - 10 Sep 2019
Abstract
The tilted ferroelectric SmC* phase of three structurally different series having three aromatic rings in the core structure connected by ester groups with different end alkyl chain lengths, all of which are derived from lactic acid, have been observed by broadband dielectric spectroscopy. [...] Read more.
The tilted ferroelectric SmC* phase of three structurally different series having three aromatic rings in the core structure connected by ester groups with different end alkyl chain lengths, all of which are derived from lactic acid, have been observed by broadband dielectric spectroscopy. Introduction of structural variations within the liquid crystalline compounds has led to the formation of chiral nematic N*, or the paraelectric orthogonal SmA* phase at higher temperatures. The dielectric spectra strongly depend both on the temperature as well as the specific molecular structure of the self-assembling compounds possessing the ferroelectric polar order. The results reveal a strong Goldstone mode in the ferroelectric SmC* phase with ~kHz relaxation frequency. In the SmC* phase, the real and imaginary parts of the complex permittivity increase up to certain temperature near the SmC*-N*/SmA* transition and then decrease with increasing temperature, perhaps due to the disruption of the molecular domains at the onset of the SmA*/N* phase transition. The dielectric strength attains a maximum value in the SmC* phase and then decreases near the SmA*/N* phase transition. The dielectric strength is also influenced by the lengths of the alkyl chain and the nature of the connecting unit of the constituent molecules. The relaxation time and the relaxation frequency are found to vary with the molecular structure of the studied ferroelectric compounds. Full article
(This article belongs to the Special Issue Ferroelectric and Ferromagnetic Liquid Crystals)
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Open AccessArticle
Fast Ferroelectric Liquid Crystal Based Optical Switch: Simulation and Experiments
Crystals 2019, 9(8), 388; https://doi.org/10.3390/cryst9080388 - 28 Jul 2019
Cited by 1
Abstract
The present work explains simulation and experimental investigation of the most significant performance parameters of a ferroelectric liquid crystal (FLC) optical switch. The measurements were carried out with commercially available FLC mixture (θ = 22.5°), having a very fast response time within [...] Read more.
The present work explains simulation and experimental investigation of the most significant performance parameters of a ferroelectric liquid crystal (FLC) optical switch. The measurements were carried out with commercially available FLC mixture (θ = 22.5°), having a very fast response time within the range of 1–10 μs. The best achieved cross talk was ~19 dB, which is an exact match with the theoretical result. Full article
(This article belongs to the Special Issue Ferroelectric and Ferromagnetic Liquid Crystals)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1.Title: Molecular-statistical theory for the description of re-entrant ferroelectric phase
Author: Alexander Emelyanenko

2. Title: In-Plane Switching Deformed Helix Ferroelectric Liquid Crystal Display Cells
E. P. Pozhidaev, T. P. Tkachenko, A. V. Kuznetsov and I. N. Kompanets
P. N. Lebedev Physical Institute of RAS, 53 Leninskiy Prospekt, Moscow, 119991 Russia;e-mail: [email protected]

 
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