The influence of the structure of terminal groups and cores on the properties of schiff base star-shaped liquid crystals

He, Qingqing; Lan, Yue; Quan, Yuan-Yuan; Li, Chunyang; Liu, Yaping; Wang, Xinjiao; Jia, Ying‐Gang; Tian, Ming; Yao, Dan-Shu

doi:10.1080/02678292.2020.1861346

Cited by 12 publications

(3 citation statements)

References 50 publications

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“…These “schlieren textures” are also visible in other liquid crystalline materials that display the texture stems from physics and superstructure as opposed to chemistry. 140 , 141 …”

Section: Liquid Crystal Formation Of Cncsmentioning

confidence: 99%

Chiral Liquid Crystalline Properties of Cellulose Nanocrystals: Fundamentals and Applications

Moud

2022

ACS Omega

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By using an independent self-assembly process that is occasionally controlled by evaporation, cellulose nanocrystals (CNCs) may create films (pure or in conjunction with other materials) that have iridescent structural colors. The self-forming chiral nematic structures and environmental safety of a new class of photonic liquid crystals (LCs), referred to as CNCs and CNC-embedded materials, make them simple to make and treat. The structure of the matrix interacts with light to give structural coloring, as opposed to other dye pigments, which interact with light by adsorption and reflection. Understanding how CNC self-assembly constructs structures is vital in several fields, including physics, science, and engineering. To constructure this review, the colloidal characteristics of CNC particles and their behavior during the formation of liquid crystals and gelling were studied. Then, some of the recognized applications for these naturally occurring nanoparticles were summarized. Different factors were considered, including the CNC aspect ratio, surface chemistry, concentration, the amount of time needed to produce an anisotropic phase, and the addition of additional substances to the suspension medium. The effects of alignment and the drying process conditions on structural changes are also covered. The focus of this study however is on the optical properties of the films as well as the impact of the aforementioned factors on the final transparency, iridescent colors, and versus the overall response of these bioinspired photonic materials. Control of the examined factors was found to be necessary to produce reliable materials for optoelectronics, intelligent inks and papers, transparent flexible support for electronics, and decorative coatings and films.

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“…These “schlieren textures” are also visible in other liquid crystalline materials that display the texture stems from physics and superstructure as opposed to chemistry. 140 , 141 …”

Section: Liquid Crystal Formation Of Cncsmentioning

confidence: 99%

Chiral Liquid Crystalline Properties of Cellulose Nanocrystals: Fundamentals and Applications

Moud

2022

ACS Omega

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“…From the end, these dots correspond to disclination lines. Other liquid crystalline materials have these "schlieren textures," but they are created by physics and superstructure rather than chemistry [158][159][160]. After some time, the alignment caused by a high magnetic field (0.25 T) could be observed; domains with discrete LC orientations that were initially torn apart by disclinations were subsequently reoriented and joined into larger domains.…”

Section: Orientationmentioning

confidence: 99%

Cellulose Nanocrystals (CNC) Liquid Crystalline State in Suspension: An Overview

Moud

2022

Applied Biosciences

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Films made from cellulose nanocrystals (CNCs) may have iridescent structural colours (pure or in combination with other materials). Numerous fields might benefit from understanding how CNC self-assembly constructs these periodic structures. Herein, we looked at the colloidal characteristics of CNC particles as well as the development and behaviour of liquid crystals (LCs). We conducted a very brief literature analysis on the main issues related to the chiral structure creation of CNC LCs, including the origins of chirality, orientation, as well as its mechanical properties. Finally, by altering the pitch size, applications such as energy storage, humidity sensing, and photonic crystals were studied in a case-by-case manner. The manuscript, it is observed that the rational design of metamaterials built on CNCs allows for the reversible changing of colours through physical and chemical modifications by adding chemical or changing environmental factors. Examples of this alteration include the use of solvents, chemical penetration in applied fields (magnetic and electric), deflection, light, temperature change, acidity change, and molecular interaction detection. Reversible colours may be produced by altering the spacing between the particles, the filler materials, or the structural elements of the system’s refractive indices. This article briefly discusses the inner workings of CNCs, potential barriers to developing photonic structures, and several techniques and processes for achieving changeable colours.

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“…Their good charge carrier mobility derives from the extended electronic conjugation supported by the azomethine (N=C) bond (also known as imine or Schiff base), which is isoelectronic with the vinylene bond (C=C) [ 8 ]. An important property of the poly(azomethine)s, which has been little exploited in the semiconductor domain, is their ability to self-order into the melt state, forming thermotropic mesophases [ 9 , 10 , 11 ]. This is possible because of the high conjugation of the azomethine units assuring the charge separation, which further favors intermolecular forces that stabilize the mesophase state.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Liquid Crystal Order of Poly(azomethine-sulfone)s on the Semiconducting Properties

et al. 2022

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Organic semiconductors are an attractive class of materials with large application in various fields, from optoelectronics to biomedicine. Usually, organic semiconductors have low electrical conductivity, and different routes towards improving said conductivity are being investigated. One such method is to increase their ordering degree, which not only improves electrical conduction but promotes cell growth, adhesion, and proliferation at the polymer–tissue interface. The current paper proposes a mathematical model for understanding the influence of the ordering state on the electrical properties of the organic semiconductors. To this end, a series of aromatic poly(azomethine)s were prepared as thin films in both amorphous and ordered states, and their supramolecular and electrical properties were analyzed by polarized light microscopy and surface type cells, respectively. Furthermore, the film surface characteristics were investigated by atomic force microscopy. It was established that the manufacture of thin films from mesophase state induced an electrical conductivity improvement of one order of magnitude. A mathematical model was developed in the framework of a multifractal theory of motion in its Schrodinger representation. The model used the order degree of the thin films as a fractality measure of the physical system’s representation in the multifractal space. It proposed two types of conductivity, which manifest at different ranges of fractalization degrees. The mathematical predictions were found to be in line with the empirical data.

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The influence of the structure of terminal groups and cores on the properties of schiff base star-shaped liquid crystals

Cited by 12 publications

References 50 publications

Chiral Liquid Crystalline Properties of Cellulose Nanocrystals: Fundamentals and Applications

Chiral Liquid Crystalline Properties of Cellulose Nanocrystals: Fundamentals and Applications

Cellulose Nanocrystals (CNC) Liquid Crystalline State in Suspension: An Overview

Impact of the Liquid Crystal Order of Poly(azomethine-sulfone)s on the Semiconducting Properties

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