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Crystals
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Nematic Liquid Crystals
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Nematic Liquid Crystals

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

Deadline for manuscript submissions: closed (10 June 2022) | Viewed by 7461

Special Issue Editors

Dr. Xiao Li

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA
Interests: liquid crystal; polymer; self-assembly; nanofabrication
Dr. Jose Adrian Martinez-Gonzalez

E-Mail Website
Guest Editor
Facultad de Ciencias, Universidad Autonoma de San Luis Potosidisabled, San Luis Potosí, Mexico
Interests: molecular modeling; liquid crystals; self-assembly
Dr. Camille Bishop

E-Mail Website
Guest Editor
The National Insitute of Standards and Technology, Gaithersburg, MD 20899, USA
Interests: liquid crystals; polymers; resonant X-ray scattering; glasses

Special Issue Information

Dear Colleagues,

Nematic liquid crystals (NLCs) are a state of matter that exhibits both crystal and liquid properties. They can change shape as a liquid but still maintain a preferred molecular alignment, thereby showing long-range orientational and/or positional correlations. NLCs are composed of organic, rod-like, disk-like, or lath-like molecules which possess the optical and electrical properties of crystals under certain conditions. NLCs can also adopt chirality by adding chiral dopant. Additional advantages of NLCs come from their nature as soft materials—elastomers, sensitive to external stimuli, elasticity, viscosity, as well as the deformation ability of different architectures. The unique properties and characteristics of LCs make them outstanding in many aspects of applications, not only as conventional electronic display materials, but also being used for photonic crystals, sensors, actuators, tissue engineering, etc.

We invite researchers to contribute to this Special Issue on Nematic Liquid Crystals, which is intended to serve as a unique multidisciplinary forum covering broad aspects of chemistry, physics, engineering, and applications of liquid crystalline materials.

The potential topics include, but are not limited to:

  • Nanofabrication of nematic liquid crystal;
  • Synthesis of liquid crystalline materials;
  • Optical sensor of nematic liquid crystal;
  • Nematic liquid crystal applied in biological materials;
  • Advanced characterization of nematic liquid crystal;
  • Liquid crystal elastomers;
  • 3D printing of liquid crystalline materials.

Dr. Xiao Li
Dr. Jose Adrian Martinez-Gonzalez
Dr. Camille Bishop
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 2600 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

  • Nematic liquid crystal
  • Nematic active matter
  • Liquid crystal elastomer
  • Self-assembly
  • Liquid crystal glasses
  • Interfacial structures

Published Papers (2 papers)

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Research

10 pages, 8128 KiB  
Article
Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz
by Rongxin Mao, Guozhen Zhang, Lu Xu, Haoyu Gao, Jun Yang, Zhiping Yin, Guangsheng Deng and Hongbo Lu
Crystals 2022, 12(2), 170; https://doi.org/10.3390/cryst12020170 - 25 Jan 2022
Cited by 4 | Viewed by 3808
Abstract
In this article, we present a study of the equivalent dielectric constant of two nematic liquid crystals (LCs) with different thicknesses, in the region from 90 to 140 GHz. The equivalent dielectric constant of the LCs was measured using a frequency selective surface [...] Read more.
In this article, we present a study of the equivalent dielectric constant of two nematic liquid crystals (LCs) with different thicknesses, in the region from 90 to 140 GHz. The equivalent dielectric constant of the LCs was measured using a frequency selective surface (FSS). The LC-based tunable FSS with 22 × 25 unit cells was printed on a quartz substrate with an area of 4 × 4 cm2 and a thickness of 480 µm; the LC layer with thicknesses ranging from 30 to 100 µm acted as a substrate. The FSS featured a maximum frequency-shifting range of 8.15 GHz and 30 µm-thick LC layers with mutually orthogonal rubbing directions were deposited on it. The results show that the initial equivalent dielectric constant of the LC layer increased with the LC layer thickness, while the saturation-equivalent dielectric constant remained almost constant. This work provides LC parameters that can be useful for the design of LC-based devices in the millimeter and terahertz ranges. Full article
(This article belongs to the Special Issue Nematic Liquid Crystals)
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13 pages, 4029 KiB  
Article
Long Rod-Like Liquid Crystal Containing Azobenzene and the Applications in Phase-Transition Regulation and Orientation of Nematic Liquid Crystal
by Qing Wang, Huang Chen, Hao Xing, Yuan Deng, Zhi-Wang Luo and He-Lou Xie
Crystals 2021, 11(4), 418; https://doi.org/10.3390/cryst11040418 - 13 Apr 2021
Cited by 5 | Viewed by 2416
Abstract
Phase-transition and orientation of liquid crystal (LC) are two crucial factors for LC application. In this work, a long rod-like LC compound containing double azobenzene (M1) is successfully designed and synthesized. The combing technologies of nuclear magnetic resonance (1H NMR, 13 [...] Read more.
Phase-transition and orientation of liquid crystal (LC) are two crucial factors for LC application. In this work, a long rod-like LC compound containing double azobenzene (M1) is successfully designed and synthesized. The combing technologies of nuclear magnetic resonance (1H NMR, 13C NMR) and Fourier transform infrared spectroscopy (FTIR) are used to identify the chemical structure of the molecule. Additionally, the polarized optical microscopy (POM), differential scanning calorimetry (DSC), and one-dimensional wide-angle X-ray diffraction (1D WAXD) experimental results show that M1 exhibits an ultrawide range of LC phases and a stable LC structure even at ultrahigh temperature, which indicates that this LC can be applied in some especial devices. Further, the compound M1 is used to tune the LC temperature range of the commercial LC 4-cyano-4′-pentylbiphenyl (5CB). A series of samples 1–7 are obtained through doping different contents of M1, which show different LC temperature ranges that are dependent on the composition ratio of M1 and 5CB. More interestingly, all resultant samples show spontaneous vertical orientation on the hydrophilic glass substrate. Meanwhile, due to the effect of azobenzene in the compound M1, a reversible transition between homeotropic to random orientation of the LC molecules is achieved when these LC cells are alternately exposed to UV irradiation and visible light, which implies that this material shows potential application in especial display and optical storage technologies. Full article
(This article belongs to the Special Issue Nematic Liquid Crystals)
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