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Structural and Physical Properties of Liquid Crystals
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Structural and Physical Properties of Liquid Crystals

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Optical and Photonic Materials".

Deadline for manuscript submissions: 20 February 2025 | Viewed by 2774

Special Issue Editors

Dr. Marli Ferreira

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Guest Editor
Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, Konarskiego 22b, 44-100 Gliwice, Poland
Interests: organic synthesis; liquid crystals; supramolecular chemistry; delayed fluorescence; sensitizers; singlet oxygen; optoelectronics
Prof. Dr. Aloir Antonio Merlo

E-Mail Website1 Website2
Guest Editor
Chemistry Institute, Federal University of Rio Grande do Sul, Bento Gonçalves 9500, Porto Alegre BR-91501970, RS, Brazil
Interests: organic synthesis; N-heterocyclic compounds; liquid crystals; polar self-assembly; photochromism; dye-sensitized solar cells; optoelectronic devices

Special Issue Information

Dear Colleagues,

Liquid crystals (LCs) are a fascinating class of soft matter that exhibit features of fluidity and long-range order. LCs have the intrinsic property of self-organization and give rise to unique physical and optical properties. This has inspired researchers to design and fabricate stimuli-responsive materials and devices for applications in a wide variety of areas.

Considering the outstanding importance of the development of new state-of-the-art liquid crystals, this Special Issue welcomes the submission of original research manuscripts, reviews embracing aspects of LC science and technology, and theoretical and experimental investigations ranging from mesogen design and synthesis to applications.

Potential topics include, but are not restricted to:

  • Design, synthesis and characterization of rod-like (calamitic), bent-core and discotic LCs
  • Functional liquid-crystalline polymers and supramolecular LCs
  • LC display science and technologies, optical alignment, switching materials, optical information processing and devices
  • Liquid crystalline properties beyond the biological applications
  • Liquid-crystalline sensitizers for singlet oxygen formation and solar cells applications
  • Investigation of triplet–triplet annihilation (TTA) in liquid crystals
  • Liquid-crystalline thermally activated delayed fluorescence (TADF) emitters
  • Environmental issues related to disposal of materials used in organic devices

Dr. Marli Ferreira
Prof. Dr. Aloir Antonio Merlo
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. Materials is an international peer-reviewed open access semimonthly 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
  • smart soft materials
  • self-assembly
  • stimuli-responsive
  • delayed fluorescence
  • sensitizers
  • solar cells

Published Papers (3 papers)

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Research

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14 pages, 4390 KiB  
Article
Photoinduced Phase Transitions of Imine-Based Liquid Crystal Dimers with Twist–Bend Nematic Phases
by Yuki Arakawa and Yuto Arai
Materials 2024, 17(13), 3278; https://doi.org/10.3390/ma17133278 - 3 Jul 2024
Viewed by 453
Abstract
Photoisomerizable molecules in liquid crystals (LCs) allow for photoinduced phase transitions, facilitating applications in a wide variety of photoresponsive materials. In contrast to the widely investigated azobenzene structure, research on the photoinduced phase-transition behavior of imine-based LCs is considerably limited. We herein report [...] Read more.
Photoisomerizable molecules in liquid crystals (LCs) allow for photoinduced phase transitions, facilitating applications in a wide variety of photoresponsive materials. In contrast to the widely investigated azobenzene structure, research on the photoinduced phase-transition behavior of imine-based LCs is considerably limited. We herein report the thermal and photoinduced phase-transition behaviors of photoisomerizable imine-based LC dimers with twist–bend nematic (NTB) phases. We synthesize two homologous series of ester- and thioether-linked N-(4-cyanobenzylidene)aniline-based bent-shaped LC dimers with an even number of carbon atoms (n = 2, 4, 6, 8, and 10) in the central alkylene spacers, namely, CBCOOnSBA(CN) and CBOCOnSBA(CN), possessing oppositely directed ester linkages, C=OO and OC=O, respectively. Their thermal phase-transition behavior is examined using polarizing optical microscopy and differential scanning calorimetry. All dimers form a monotropic NTB phase below the temperature of the conventional nematic (N) phase upon cooling. Remarkably, the NTB phases of CBCOOnSBA(CN) (n = 2, 4, 6, and 8) and CBOCOnSBA(CN) (n = 6 and 8) supercool to room temperature and vitrify without crystallization. In addition, the phase-transition temperatures and entropy changes of CBCOOnSBA(CN) are lower than those of CBOCOnSBA(CN) at the same n. Under UV light irradiation, the NTB and N phases transition to the N and isotropic phases, respectively, and reversibly return to their initial LC phases when the UV light is turned off. Full article
(This article belongs to the Special Issue Structural and Physical Properties of Liquid Crystals)
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13 pages, 9516 KiB  
Article
Comparative Study of the Optical and Dielectric Anisotropy of a Difluoroterphenyl Dimer and Trimer Forming Two Nematic Phases
by Evangelia E. Zavvou, Chris Welch, Georg H. Mehl, Alexandros G. Vanakaras and Panagiota K. Karahaliou
Materials 2024, 17(11), 2555; https://doi.org/10.3390/ma17112555 - 25 May 2024
Viewed by 501
Abstract
We present a comparative study of the optical and dielectric anisotropy of a laterally fluorinated liquid crystal dimer and its homologous trimer, both exhibiting two nematic phases. In the high-temperature nematic phase, both oligomers exhibit positive optical anisotropy with similar magnitude, which, however, [...] Read more.
We present a comparative study of the optical and dielectric anisotropy of a laterally fluorinated liquid crystal dimer and its homologous trimer, both exhibiting two nematic phases. In the high-temperature nematic phase, both oligomers exhibit positive optical anisotropy with similar magnitude, which, however, is lower in comparison with the optical anisotropy of the monomer. In the same temperature range, the dielectric permittivity along and perpendicular to the nematic director, measured on magnetically aligned samples, reveals negative dielectric anisotropy for both oligomers, which saturates as the temperature approaches the N–N phase transition temperature. Comparison of the dielectric anisotropies of the oligomers with the corresponding anisotropy of the monomer indicates a systematic variation of its magnitude with the number of the linked mesogenic units. Results are compared with the corresponding anisotropies of the cyanobiphenyl dimers, the archetypal compounds with two nematic phases, and are discussed in terms of the dipolar structure of the mesogens and the dipolar correlations in their nematic phases. Full article
(This article belongs to the Special Issue Structural and Physical Properties of Liquid Crystals)
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Review

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26 pages, 12445 KiB  
Review
Amorphous Blue Phase III: Structure, Materials, and Properties
by Atsushi Yoshizawa
Materials 2024, 17(6), 1291; https://doi.org/10.3390/ma17061291 - 11 Mar 2024
Viewed by 1403
Abstract
Blue phases (BPs) have a frustrated structure stabilized by chirality-dependent defects. They are classified into three categories: blue phase I (BPI), blue phase II (BPII), and blue phase III (BPIII). Among them, BPIII has recently attracted much attention due to its elusive amorphous [...] Read more.
Blue phases (BPs) have a frustrated structure stabilized by chirality-dependent defects. They are classified into three categories: blue phase I (BPI), blue phase II (BPII), and blue phase III (BPIII). Among them, BPIII has recently attracted much attention due to its elusive amorphous structure and high-contrast electro-optical response. However, its structure has remained unelucidated, and the molecular design for stabilizing BPIII is still unclear. We present the following findings in this review. (1) BPIII is a spaghetti-like tangled arrangement of double-twist cylinders with characteristic dynamics. (2) Molecular biaxiality and flexibility contribute to stabilize BPIII. (3) BPIII exhibits submillisecond response, high contrast, and wide-viewing angle at room temperature without surface treatment or an optical compensation film. It was free from both hysteresis and residual transmittance. The electro-optical effects are explained in relation to the revealed structure of BPIII. Finally, we discuss the memory effect of a polymer network derived from the defects of BPIII. Full article
(This article belongs to the Special Issue Structural and Physical Properties of Liquid Crystals)
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