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Crystals
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Liquid Crystal Composites
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Liquid Crystal Composites

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

Deadline for manuscript submissions: closed (15 October 2022) | Viewed by 8925

Special Issue Editors

Prof. Dr. Doina Manaila-Maximean

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Guest Editor
Physics Department, Faculty of Applied Sciences, University “Politehnica” of Bucharest, 060042 Bucharest, Romania
Interests: liquid crystals; liquid crystal composites; dielectric properties; physical properties; optoelectronics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Viorel Circu

E-Mail Website
Guest Editor
Department of Inorganic Chemistry, Faculty of Chemistry, University of Bucharest, Bucharest, Romania
Interests: liquid crystals; metallomesogens; luminescent materials; inorganic and coordination chemistry
Special Issues, Collections and Topics in MDPI journals
Dr. Octavian Danila

E-Mail Website
Guest Editor
Physics Department, Faculty of Applied Sciences, University “Politehnica” of Bucharest, 060042 Bucharest, Romania
Interests: optoelectronics; liquid crystals; laser optics; quantum optics; metaoptics

Special Issue Information

Dear Colleagues,

This Special Issue on “Liquid Crystal Composites” addresses recent progress in both experimental and theoretical aspects of liquid crystal (LC) composites science and technology, including material design, synthesis, processing, fabrication, characterization, and engineering.

LCs are characterized by the orientational order of molecules and their total or partial lack of positional order. With their unique combination of properties related to anisotropic fluids (anisotropy of physical properties and fast orientational response to external fields), LCs are among the most versatile and dynamic soft materials of the present day.

Composite materials with LCs are designed to combine the beneficial properties of the constituents. They include polymer-dispersed LC films, polymer–network LCs, polymer–stabilized LCs, polymer film/LC composite, polymer balls/LC films, glass balls/LC composite, porous glasses/LCs, LC membranes, NP doped LCs and LC composites, LCs metamaterials.

This Special Issue “Liquid Crystal Composites” offers an appropriate opportunity to authors and research groups to make their studies visible to the LC scientific community.

We invite original research articles and detailed review papers on recent important advances in the fundamental, as well as application aspects of LC-based materials, biological, organic, and inorganic, concerning both experimental and theoretical studies.

Prof. Dr. Doina Manaila-Maximean
Prof. Dr. Viorel Circu
Dr. Octavian Danila
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

  • Liquid crystals
  • Liquid crystal composites
  • Polymer liquid crystal composite
  • Organic optoelectronics
  • Polymer–stabilized liquid crystals
  • Liquid crystals metamaterials
  • Liquid crystals membranes
  • Nanomaterials

Published Papers (3 papers)

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Research

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11 pages, 1630 KiB  
Article
Evidence of Counterion Size Effect on the Stability of Columnar Phase of Ionic Liquid Crystals Based on Pyridinium Salts Derived from N-3,4,5-Tri(alkyloxy)-benzyl-4-pyridones
by Isabela Dumitru, Florentina L. Chiriac, Monica Ilis, Iuliana Pasuk, Doina Manaila-Maximean, Marin Micutz, Teodora Staicu and Viorel Cîrcu
Crystals 2022, 12(5), 715; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst12050715 - 17 May 2022
Cited by 3 | Viewed by 1633
Abstract
The synthesis and characterization of novel ionic liquid crystals based on pyridinium salts with Br− and PF6− counterions are described in this work. These pyridinium salts were derived from 4-hydroxypyridine, both by N- and O-alkylation. The 3,4,5-tri(alkyloxy)-benzyl mesogenic [...] Read more.
The synthesis and characterization of novel ionic liquid crystals based on pyridinium salts with Br− and PF6− counterions are described in this work. These pyridinium salts were derived from 4-hydroxypyridine, both by N- and O-alkylation. The 3,4,5-tri(alkyloxy)-benzyl mesogenic unit was attached to the nitrogen atom of the pyridinium ring. Alkyl chains with a different number of carbon atoms (6, 8, 10, 12 and 14) were employed in order to show the effect on the stability of mesophase. The POM (polarizing optical microscopy) and XRD (powder X-ray diffraction) studies indicated that bromide salts with shorter chains C6, C8 and C10 do not show mesomorphic properties, while longer chain analogues with C12 and C14 exhibit two enantiotropic columnar phases. Surprisingly, the pyridinium salts with the larger size PF6− counterion do not exhibit liquid crystal properties. Full article
(This article belongs to the Special Issue Liquid Crystal Composites)
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9 pages, 3470 KiB  
Article
Controllable Liquid Crystal Micro Tube Laser
by Jia-De Lin, Po-Chen Wu, Ting-Shan Mo, Bing-Yau Huang, Chie-Tong Kuo and Chia-Rong Lee
Crystals 2021, 11(12), 1510; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11121510 - 03 Dec 2021
Viewed by 2296
Abstract
This study demonstrates controllable random lasing emissions in a dye-doped nematic liquid crystal (DDNLC)-infiltrated microcapillary. The emission wavelength of the micro tube laser can be adjusted by changing the focusing position of the pumped pulses on the center or the periphery of the [...] Read more.
This study demonstrates controllable random lasing emissions in a dye-doped nematic liquid crystal (DDNLC)-infiltrated microcapillary. The emission wavelength of the micro tube laser can be adjusted by changing the focusing position of the pumped pulses on the center or the periphery of the liquid crystal region of the microcapillary. In addition, with doping azo-dyes in the DDNLC of the micro tube laser, optical controllability of the lasing intensity and wavelength can be further achieved. The controllable micro tube laser may find highly widespread photonic applications in multicolor emitting sources, and vibration and UV sensors. Full article
(This article belongs to the Special Issue Liquid Crystal Composites)
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Review

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26 pages, 13161 KiB  
Review
A Review on Mesophase and Physical Properties of Cyclotriphosphazene Derivatives with Schiff Base Linkage
by Zuhair Jamain, Ahmad Nor Asyraf Azman, Nurul Asma Razali and Mohamad Zul Hilmey Makmud
Crystals 2022, 12(8), 1174; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst12081174 - 21 Aug 2022
Cited by 7 | Viewed by 3947
Abstract
Over the last decades, liquid crystalline has been of great recent importance due to many unique and different features. The linking unit, terminal group, and core system are the most factors to influence the liquid crystal behaviour. Schiff base linkage with the formula [...] Read more.
Over the last decades, liquid crystalline has been of great recent importance due to many unique and different features. The linking unit, terminal group, and core system are the most factors to influence the liquid crystal behaviour. Schiff base linkage with the formula of -C=N- can maintain linearity by providing the stepped core structure with high stability. Incorporation of Schiff base linkage in cyclotriphosphazene system enhances the mesophase characteristic and high thermal stability. This review focussed on the mesophase behaviour and physical properties of cyclotriphosphaze derivatives attached to Schiff base linkages. A basic introduction to liquid crystalline materials, including description and classification, is provided in this review. Full article
(This article belongs to the Special Issue Liquid Crystal Composites)
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