Materials with Liquid–Crystalline Properties—Structure, Stimuli Responsiveness and Functionality

A special issue of Chemistry (ISSN 2624-8549). This special issue belongs to the section "Chemistry of Materials".

Deadline for manuscript submissions: 15 September 2026 | Viewed by 1370

Special Issue Editor


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Guest Editor
Institute for Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
Interests: liquid crystals; supramolecular chemistry; stimuli responsive materials; ionic liquid crystals; mesogen design; ferroelectric; polar phases; organic synthesis; X-ray scattering (SAXS, WAXS, GISAXS); phase transitions; charge carrier mobility; ion mobility; donor-acceptor materials; fullerene hybride materials; helical structures; nanosegregation
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Special Issue Information

Dear Colleagues,

Liquid crystals combine their fluid nature with either orientational and/or positional long-range order. This unique combination allows for stimuli-responsive properties; thus, the materials that can reply to external forces, including electric, magnetic or mechanical fields or light. The materials emerge from inorganic, organic or hybrid structures, and they may consist of small, low-molar-mass structures, colloidal particles, supra- or supermolecular assemblies and polymers. Liquid crystal properties and liquid-crystal-derived structures are omnipresent in nature, and play an important part in soft matter science. This Special Issue presents new directions in the field of liquid-crystal-derived materials, comprising advances in liquid crystal design, photonic materials, semiconductors, polar structures and their applications, soft robotics and liquid crystal chromophores and fluorophores with potential usage in sensing applications.

Prof. Dr. Matthias Lehmann
Guest Editor

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Keywords

  • liquid crystals
  • molecular engineering
  • self-assembly
  • nanostructure
  • stimuli responsiveness
  • photonics
  • soft robotics
  • sensing
  • semiconductors
  • polar liquid crystals
  • ionic liquid crystals

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Published Papers (2 papers)

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Research

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13 pages, 1807 KB  
Article
Encryption Using Cholesteric Liquid Crystal Epoxy Film with Regionally Tailored Cross-Linking
by Yingying Yi, Wenqian Yang, Yi Li, Wei Liu and Yonggang Yang
Chemistry 2026, 8(2), 24; https://doi.org/10.3390/chemistry8020024 - 13 Feb 2026
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Abstract
Vividly colored cholesteric liquid crystal polymer network (CLCN) patterns based on epoxy resin are used in decorative and anti-counterfeiting applications. These films are typically prepared via cationic photopolymerization and post-polymerization to achieve a high cross-linking degree. In this work, the cross-linking degree is [...] Read more.
Vividly colored cholesteric liquid crystal polymer network (CLCN) patterns based on epoxy resin are used in decorative and anti-counterfeiting applications. These films are typically prepared via cationic photopolymerization and post-polymerization to achieve a high cross-linking degree. In this work, the cross-linking degree is controlled by varying the UV irradiation dosage during photopolymerization. Following this, the reflection band of the CLCN film changes after removing non-cross-linked compounds with acetone. Leveraging the low cationic polymerization rate and the chain termination capability of methanol, a structurally colored CLCN film with regionally tailored cross-linking was fabricated. With the treatment of acetone, a colorful pattern was observed. Moreover, upon immersion in methanol, the film swelled, revealing a colorful pattern. After the evaporation of methanol, the pattern disappeared. Consequently, this CLCN film holds significant potential for information encryption applications. Full article
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Review

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18 pages, 5415 KB  
Review
Liquid Crystalline Perylene Bisimide Derivatives Bearing Oligosiloxane Moieties
by Masahiro Funahashi and Shinobu Uemura
Chemistry 2026, 8(4), 45; https://doi.org/10.3390/chemistry8040045 - 3 Apr 2026
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Abstract
Perylene bisimide derivatives are typical n-type semiconductors as well as redox-active materials. However, it has been difficult to produce thin films by solution processes because of their low solubilities in organic solvents. Perylene bisimide derivatives bearing oligosiloxane moieties exhibit columnar phases over [...] Read more.
Perylene bisimide derivatives are typical n-type semiconductors as well as redox-active materials. However, it has been difficult to produce thin films by solution processes because of their low solubilities in organic solvents. Perylene bisimide derivatives bearing oligosiloxane moieties exhibit columnar phases over wide temperature ranges, including room temperature and high solubilities in organic solvents. The columnar phases are stabilized by nanosegregation between crystal-like one-dimensional π-stacks and liquid-like mantle consisting of oligosiloxane moieties. The electron mobility at room temperature exceeded 0.1 cm2V−1s−1 in the ordered columnar phases of perylene bisimide derivatives bearing four disiloxane chains. Uniaxially aligned thin films of the perylene bisimide derivatives bearing oligosiloxane moieties could be produced by a spin-coating method. The spin-coated films of the perylene bisimide derivatives bearing cyclotetrasiloxane rings could be insolubilized via in situ ring-opening polymerization by the exposure of the thin films to trifluoromethanesulfonic acid vapors. Uniaxially aligned thin films of perylene bisimide derivatives bearing an ethylene oxide chain as well as cyclotetrasiloxane rings could be doped in an aqueous solution of sodium dithionate, resulting in an anisotropic electrical conductivity. Polymerized thin films of perylene bisimide derivatives bearing a crown ether ring exhibited electrochromism in electrolyte solutions. These compounds formed 1:1 complexes with lithium triflate, exhibiting columnar phases at room temperature. The nanostructures of the complexes were stabilized by the electrostatic interaction between cationic crown-metal units and triflate anions. Full article
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