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Crystals
Special Issues
Liquid Crystals and New Applications in Sensing and Sensors
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Liquid Crystals and New Applications in Sensing and Sensors

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

Deadline for manuscript submissions: closed (10 December 2023) | Viewed by 2272

Special Issue Editors

Prof. Dr. Pedro De Almeida

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Guest Editor
1. Physics Department, Lisbon Superior Institute of Engineering, Rua Conselheiro Emídio Navarro, 1, 1959-007 Lisboa, Portugal
2. i3N, CENIMAT, Materials Science Department, Faculty of Sciences and Technology, NOVA University of Lisbon, Campus da Caparica, 2829-516 Caparica, Portugal
Interests: liquid crystals; liquid crystals applications; polymeric materials; liquid crystalline polymers; cellulosic materials and derivatives; cellulosic liquid crystals; solid state NMR; Rheo-NMR; electro-optical properties; anisotropic mechanical properties; mechano-optical properties
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Doina Manaila-Maximean

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Guest Editor
Department of Physics, University "Politehnica" of Bucharest, Bucharest, Romania
Interests: liquid crystals; liquid crystals composites and applications; physical properties of materials; solar cells
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

Special Issue Information

Dear Colleagues,

Since the identification of liquid crystalline (LC) materials in 1888, the properties of LC materials have attracted much interest. These fascinating materials can present the mechanical properties of liquids, by flowing, while presenting the optical or electrical properties of some solid crystals, being anisotropic.

The interest in LC materials increased dramatically after their successful application in information displays in the 1960s, enabling the development and exponential growth of most of the technology currently available. This fundamental and applied research has focused not only on the application of liquid crystals in information displays, but also on other types of applications based on the optical properties of liquid crystals and their ability to respond to external stimuli. These anisotropic molecules respond to environmental changes, such as temperature, electric and magnetic fields, light, humidity, mechanical stresses and deformation, among others.

In recent decades, liquid crystals have emerged as an important new class of materials that can be used in biological, chemical, electrical, mechanical, and optical sensing to produce a wide variety of sensor applications. This Special Issue of Crystals is dedicated to liquid crystals and their applications, such as sensing liquid crystals and the liquid crystal sensors.

We strongly encourage experimental and theoretical contributions in different areas, including the design of new mesogens, ionic liquid crystals, lyotropic liquid crystals, metallomesogens, polymeric liquid crystals, and liquid crystals composites, as well as their applications.

Prof. Dr. Pedro Marques De Almeida
Prof. Dr. Doina Manaila-Maximean
Prof. Dr. Viorel Circu
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

  • surfaces and interfaces
  • confined geometries
  • liquid crystalline defects
  • liquid crystal sensors
  • “smart” materials
  • nanoparticles
  • liquid crystal composites
  • polymer liquid crystals
  • metallomesogens
  • ionic liquid crystals

Published Papers (2 papers)

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Research

20 pages, 2880 KiB  
Article
A Numerical Study on the Performance of Liquid Crystal Biosensor Microdroplets
by Reza Shadkami and Philip K. Chan
Crystals 2023, 13(8), 1237; https://doi.org/10.3390/cryst13081237 - 10 Aug 2023
Cited by 1 | Viewed by 896
Abstract
The numerical results from the modeling of liquid crystals dispersed in aqueous solutions in the form of axially symmetric droplets, with the aim of helping to facilitate the development of liquid crystal biosensors, were obtained. We developed a transient two-dimensional nonlinear model obtained [...] Read more.
The numerical results from the modeling of liquid crystals dispersed in aqueous solutions in the form of axially symmetric droplets, with the aim of helping to facilitate the development of liquid crystal biosensors, were obtained. We developed a transient two-dimensional nonlinear model obtained via torque balance that incorporates Frank’s elastic free energy. In order to perform parametric studies, we defined the scaled parameters based on the surface viscosity and the homeotropic anchoring energy at the droplet interface. To evaluate the performance of the biosensor, the average angle and characteristic time were defined as performance criteria. Using these results, we studied the bulk reorientation of liquid crystal droplets in aqueous solutions caused by biomolecular interaction. Furthermore, we examined how surface viscosity affects the performance of a biosensor in the case of weak planar anchoring. The droplet interface ordering was modeled using the Euler–Lagrange equation. The droplets’ equilibrium was determined by minimizing their total distortion energy based on the interaction between their surface and bulk elastic energy. Two factors that contributed to the biosensor performance were homeotropic strength and surface viscosity. This highlights the importance of controlling the surface and physicochemical properties to achieve the desired liquid crystal orientation. In addition, our results provide insight into the role that surface viscosity plays in controlling radial configuration. Full article
(This article belongs to the Special Issue Liquid Crystals and New Applications in Sensing and Sensors)
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20 pages, 31005 KiB  
Article
Chemical Characterization and Thermal Analysis of Recovered Liquid Crystals
by Ana Barrera, Corinne Binet, Florence Danede, Jean-François Tahon, Baghdad Ouddane, Frédéric Dubois, Philippe Supiot, Corinne Foissac and Ulrich Maschke
Crystals 2023, 13(7), 1064; https://doi.org/10.3390/cryst13071064 - 06 Jul 2023
Viewed by 946
Abstract
Chemical, structural, and thermal properties of recovered nematic Liquid Crystal (LC) mixtures were investigated by applying several analytical techniques. A large quantity (65,700) of End-Of-Life (EOL) Liquid Crystal Display (LCD) screens were used to extract these LC blends. The studied EOL-LCD screens were [...] Read more.
Chemical, structural, and thermal properties of recovered nematic Liquid Crystal (LC) mixtures were investigated by applying several analytical techniques. A large quantity (65,700) of End-Of-Life (EOL) Liquid Crystal Display (LCD) screens were used to extract these LC blends. The studied EOL-LCD screens were heterogeneous in nature, particularly due to their different brands, production years, and dimensions. The collected TV and computer screens, as well as tablets, presented an average diagonal size of 24 inches. Chemical characterization revealed that the recovered compounds present typical chemical structures of LC molecules by the simultaneous presence of aliphatic chains and aromatic and polar groups. POM observations of these samples exhibited Schlieren and marble-like textures at room temperature, which are typical of nematic LCs. Moreover, thermal characterization and thermo-optical analysis showed that these LC mixtures displayed a broad nematic phase between −90 °C and +70 °C. Full article
(This article belongs to the Special Issue Liquid Crystals and New Applications in Sensing and Sensors)
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