Special Issue "Nematic Liquid Crystals 2022"

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

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 1232

Special Issue Editor

Dr. Jinfeng Li
E-Mail Website
Guest Editor
Department of Electrical and Electronic Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
Interests: liquid crystals; azobenzene liquid crystals; phase shifter; phased array antenna; microwave devices; millimeter-wave devices; multilevel inverters; sentiment analysis; contact tracing

Special Issue Information

Dear Colleagues,

The research into nematic liquid crystal (NLC)-based tunable (reconfigurable) components at radio frequencies (microwave, millimetre-wave, terahertz) have reached maturity in the last decade, with more than a dozen documented state-of-the-art devices and systems holding the promise for game-changing applications.

From the optimization perspectives of device architecture and driving methods, however, each new incremental improvement (tunability, insertion loss, response time, size, and cost, etc.) is arguably smaller than the last, which motivates the need for new chemistry or physics to understand and extend the performance limits.

We invite submissions discussing unconventional principles, new methods, advanced techniques, and novel technologies that could underpin a vast performance improvement of the NLC-based devices and systems at radio frequencies.

Dr. Jinfeng Li
Guest Editor

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 2000 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

  • liquid crystals
  • insertion loss
  • tunable dielectrics
  • dielectric anisotropy
  • microwave tunable devices
  • millimeter-wave tunable devices
  • electronic beam steering

Published Papers (2 papers)

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Editorial

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Editorial
Challenges and Opportunities for Nematic Liquid Crystals in Radio Frequency and Beyond
by
Crystals 2022, 12(5), 632; https://doi.org/10.3390/cryst12050632 - 28 Apr 2022
Viewed by 551
Abstract
Revving up the rollout of high-data-rate low-latency next-generation communication and beyond (5G and 6G), the trend of developing tunable components based on tunable dielectrics is feeding the appetite for precise beam steering and wavefront phase control with more reconfigurability and bandwidth, as well [...] Read more.
Revving up the rollout of high-data-rate low-latency next-generation communication and beyond (5G and 6G), the trend of developing tunable components based on tunable dielectrics is feeding the appetite for precise beam steering and wavefront phase control with more reconfigurability and bandwidth, as well as power-efficient stepless controllability (continuous analogue tuning) for mission-critical systems [...] Full article
(This article belongs to the Special Issue Nematic Liquid Crystals 2022)

Research

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Article
2-Pyridinyl-Terminated Iminobenzoate: Type and Orientation of Mesogenic Core Effect, Geometrical DFT Investigation
Crystals 2022, 12(7), 902; https://doi.org/10.3390/cryst12070902 - 24 Jun 2022
Viewed by 249
Abstract
A new liquid crystal series of pyridin-2-yl 4-[4-(alkylphenyl)iminomethyl]benzoate was synthesized and characterized for their mesomorphic behavior. These compounds contain Schiff base and carboxylate ester mesogenic cores, in addition to terminal alkyl chains with a different number of carbons. The structures were confirmed via [...] Read more.
A new liquid crystal series of pyridin-2-yl 4-[4-(alkylphenyl)iminomethyl]benzoate was synthesized and characterized for their mesomorphic behavior. These compounds contain Schiff base and carboxylate ester mesogenic cores, in addition to terminal alkyl chains with a different number of carbons. The structures were confirmed via FT-IR, and 1H NMR spectroscopy. The phase transitions were studied by differential thermal analysis (DSC) and the mesophase types were identified by polarized optical microscopy (POM). A comparative study was performed between the synthesized compounds and previously reported compounds. Density functional theory (DFT) calculations were included in the study to compute the dipole moment and the polarizability, as well as the frontier molecular orbitals and the charge distribution mapping, which impact the terminal and lateral interactions of the compounds. The theoretical results were discussed to confirm the experimental data and explain the mesomorphic behavior of the compounds. Finally, the energy gap, global softness, and chemical hardness were calculated to determine the suitability of the liquid crystalline compounds to be employed in applications. Full article
(This article belongs to the Special Issue Nematic Liquid Crystals 2022)
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