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Crystals
Special Issues
Bent-Shaped Liquid Crystals and Beyond
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Bent-Shaped Liquid Crystals and Beyond

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

Deadline for manuscript submissions: closed (30 June 2020) | Viewed by 13343

Special Issue Editors

Prof. Dr. Alexey Eremin

E-Mail Website
Guest Editor
Institute of Physics, Otto von Guericke University, Universitätsplatz 2, D-39106 Magdeburg, Germany
Interests: soft condensed matter physics; nonlinear dynamics; biophysics
Prof. Dr. Fumito Araoka

E-Mail Website
Guest Editor
RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Interests: soft matter sciences; self-organized systems; soft optics

Special Issue Information

Dear Colleagues,

The year 2019 marked the ninetieth anniversary of the first report of the synthesis of bent-core mesogens by Vorländer in 1929. Even now, these unique liquid crystals provide a wealth of exciting new phenomena and continue to surprise researchers. Spontaneous breaking of chiral symmetry, nanostructured polar phases, and optical switching are just a few examples of the complex behaviors of bent-shaped liquid crystals. In recent years, there has been significant progress in understanding the structure and physical properties of BLCs, which is, to a large extent, attributed to the application of resonant X-ray scattering. However, new materials have also appeared, with promising properties for photonic applications and photomanipulation.

This Special Issue is intended to serve as a multidisciplinary forum covering broad aspects of physics, chemistry, and technological applications of bent-shaped liquid crystals.

The topics include:

  • Synthesis of BLCs
  • Nanostructured phases
  • Polarity and chirality
  • Optical and photonic properties
  • BLCs in restricted geometry
  • Effects at surfaces and interfaces
  • Rheology
  • Applications in technology and medicine

We cordially invite researchers to contribute to this Special Issue on “Bent-Shaped Liquid Crystals and Beyond”.

Prof. Dr. Alexey Eremin
Prof. Dr. Fumito Araoka
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2100 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Bent-shaped liquid crystals
  • Chirality and polarity
  • Ferroelectrics and antiferroelectrics
  • Soft nanostructured materials
  • Optics of liquid crystals

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

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20 pages, 4672 KiB  
Article
The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials
by Helena Skopalová, Petr Špaček, Václav Kozmík, Jiří Svoboda, Vladimíra Novotná, Damian Pociecha and Michal Kohout
Crystals 2020, 10(9), 735; https://doi.org/10.3390/cryst10090735 - 21 Aug 2020
Cited by 2 | Viewed by 2302
Abstract
We present the synthesis and mesomorphic properties of the new series of bent-core liquid crystals based on 3-hydroxybenzoic acid bearing a lateral substituent in the apex position. Four different substituents of various sizes and electronic properties have been used. We have found that [...] Read more.
We present the synthesis and mesomorphic properties of the new series of bent-core liquid crystals based on 3-hydroxybenzoic acid bearing a lateral substituent in the apex position. Four different substituents of various sizes and electronic properties have been used. We have found that only compounds substituted with fluorine are mesogenic and exhibit one mesophase, whose type differs when prolonging the terminal alkyl chain. For homologues with shorter alkyl chains (octyl, decyl), a columnar B1-type of a mesophase was observed, while materials with longer terminal chains (dodecyl, tetradecyl) exhibited a switchable lamellar SmCAPA phase. Calorimetric measurements, texture observations under a polarizing microscope were performed and electro-optical properties studied. Additionally, dielectric measurements were realized to characterize the molecular dynamics in the SmCAPA phase. All mesogenic compounds were further studied by X-ray measurements to confirm phase identification and obtain more information about their structural parameters. Full article
(This article belongs to the Special Issue Bent-Shaped Liquid Crystals and Beyond)
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11 pages, 4298 KiB  
Article
Antiferroelectric Bent-Core Liquid Crystal for Possible High-Power Capacitors and Electrocaloric Devices
by Rony Saha, Chenrun Feng, Alexey Eremin and Antal Jákli
Crystals 2020, 10(8), 652; https://doi.org/10.3390/cryst10080652 - 30 Jul 2020
Cited by 8 | Viewed by 3961
Abstract
We present small-angle X-ray scattering, polarized optical microscopy and electric current measurements of a sulfur-containing bent-core liquid crystal material for characterization of the layer and director structures, thermally and electrically driven transitions between antiferroelectric and ferroelectric structures and switching properties. It was found [...] Read more.
We present small-angle X-ray scattering, polarized optical microscopy and electric current measurements of a sulfur-containing bent-core liquid crystal material for characterization of the layer and director structures, thermally and electrically driven transitions between antiferroelectric and ferroelectric structures and switching properties. It was found that the material has polarization-modulated homochiral synclinic ferroelectric (SmCsPFmod), homochiral anticlinic antiferroelectric (SmCaPA) and racemic synclininc antiferroelectric (SmCsPA) structures that can be reversibly switched between each other either thermally and/or electrically. High switching polarization combined with softness of the liquid crystalline structure makes this compound a good candidate for applications in high-power capacitors and electrocaloric devices. Full article
(This article belongs to the Special Issue Bent-Shaped Liquid Crystals and Beyond)
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Review

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25 pages, 8298 KiB  
Review
Orientation Control of Helical Nanofilament Phase and Its Chiroptical Applications
by Wongi Park and Dong Ki Yoon
Crystals 2020, 10(8), 675; https://doi.org/10.3390/cryst10080675 - 5 Aug 2020
Cited by 17 | Viewed by 6472
Abstract
Chiral liquid crystal phases show fascinating structural and optical properties due to their inherent helical characteristics. Among the various chiral liquid crystal phases, the helical nanofilament phase, made of achiral bent-shaped molecules, has been of keen research interest due to its unusual polar [...] Read more.
Chiral liquid crystal phases show fascinating structural and optical properties due to their inherent helical characteristics. Among the various chiral liquid crystal phases, the helical nanofilament phase, made of achiral bent-shaped molecules, has been of keen research interest due to its unusual polar and chiral properties. This review is intended to introduce the recent progress in orientation control and its application to the helical nanofilament phase, which includes topographic confinement, photoalignment, and chiroptical applications such as photonic crystal and chirality sensor. Full article
(This article belongs to the Special Issue Bent-Shaped Liquid Crystals and Beyond)
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