High tilted antiferroelectric liquid crystals: Polymer-based approach for phase stabilisation and device development

Nepal, Shantiram; Das, Bidisa; Das, Malay Kumar; Sarkar, Madhumita Das; Strójwąs, Katarzyna; Dmochowska, Ewelina; Czerwiński, Michał

doi:10.1016/j.molliq.2023.121297

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…This series of empirical approaches clarified some clear correlations between the expected surface pre-tilt angle and dielectric relaxation properties, dynamic retardation switching behavior, respectively, which are expected indication of liquid crystal layer's total polarization direction as well as possible quadrupole moment involvement. Molecular packing configuration is reasonably supposed to give some significant influence on its electro-optic response performance such as optical response time, swing angle, and so on [14][15][16][17][18]. Surface pre-tilt setting and its combination between the top and bottom surface, which provides either a parallel or an anti-parallel mechanical buffing configuration, is one of the decisive factors to provide specific molecular packing at least a nematic liquid crystal panel, so does at a smectic liquid crystal panel presumably.…”

Section: Introductionmentioning

confidence: 99%

An orthogonal coupling between liquid crystal layer polarization and externally applied electric field by an SSD liquid crystal

Mochizuki

2024

Emerging Liquid Crystal Technologies XIX

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TE-mode optical switching by a liquid crystal device attracts interests both its application and scientific principle. Optical axis switching of the liquid crystal molecules perpendicular to the incident light provides TE-mode switching, which enables phase only switching without changing light throughput amplitude. A vertically applied electric filed to a planar aligned liquid crystal layer gives freedom to a liquid crystal panel configuration design. Such a TE-mode optical switching requires orthogonal driving torque of a liquid crystal molecules by vertically applied electric field. A typical dielectric driving torque does not provide such an orthogonal driving. A conceivable orthogonal driving torque is provided by quadrupole momentum. Liquid crystal layer's parallel direction of polarization to the substrates may respond to the vertically applied electric field when the liquid crystal layer shows some quadrupole moment. This investigation tries influence of polarization direction of the liquid crystal layer originated from surface pre-tilt angle as well as its influence on electro-optical behavior.

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Section: Introductionmentioning

confidence: 99%

An orthogonal coupling between liquid crystal layer polarization and externally applied electric field by an SSD liquid crystal

Mochizuki

2024

Emerging Liquid Crystal Technologies XIX

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“…These defects significantly affect the functionality of the components. To establish reliable connections or precise positioning with other components, it is often necessary to resort to machining techniques, including the creation of holes and notches, in engineering applications [58,59]. The automotive and aviation sectors have devoted considerable attention to the utilization of fiber-reinforced plastic (FRP) composites.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Hybrid FRP Composite Produced from Recycled PET and CFRP

Almahri,

Madi,

Alkaabi

et al. 2023

Polymers

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In recent years, carbon fiber has experienced a significant surge in popularity attributed to its exceptional properties, including its high-temperature resistance, mechanical strength, and cost-effectiveness. Many industries have been attracted to the prevalent use of carbon-fiber-reinforced polymers or plastics (CFRP). However, the increasing demand for carbon fiber has created a waste recycling problem that needs to be addressed. This research aimed to develop a recycled composite using PET waste as a solution to the growing demand for both materials. The recycled carbon fibers were processed chemically and mechanically to generate power for this process. Various samples were tested with different proportions of CF (10%, 20%, 30%, and 40%) to analyze their mechanical properties. The recycled composites are examined under tensile test conditions to further explore the waste carbon reinforcement’s effect on polymers’ characteristics. Scanning electron microscopy was also utilized for mechanical morphology evaluations. After analyzing the data, it was found that samples containing 20% CF had the highest elastic modulus value among all the mixes. This is attributed to the reinforcing effect of the fibers. The Elasticity Modulus of the filaments increased with the concentration of CF, reaching its peak at 20% before decreasing. This trend is also apparent in the visual representations. When compared to recycling, the Elasticity Modulus value of 20% CF filament increased by 97.5%. The precise value for CF with a 20% filament is 4719.3 MPa. Moreover, the composite samples were analyzed using SEM to characterize them, and it was discovered that the incorporation of 20% CF/PET filler produced the composition with the highest strength.

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Supramolecular Arrangement and Conformational and Dynamic Properties of Chiral Smectic Liquid Crystals Obtained through Nuclear Magnetic Resonance: A Brief Review

Domenici

2024

Crystals

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Ferroelectric and antiferroelectric smectic liquid crystalline (LC) phases are still at the center of investigations and interests for both their fundamental properties and variety of technological applications. This review aims to report the main contributions based on different nuclear magnetic resonance (NMR) techniques to the study of chiral liquid crystalline calamitic mesogens forming smectic phases, such as the SmA, the SmC* (ferroelectric), and the SmC*A (antiferroelectric) phases. 2H NMR and 13C NMR techniques and their combination were of help in clarifying the local orientational properties (i.e., the molecular and fragments’ main orientational order parameters) at the transition between the SmA and the SmC* phases, and in the particular case of de Vries liquid crystals, NMR studies gave important clues regarding the actual models describing the molecular arrangement in these two phases formed by de Vries LCs. Moreover, this review describes how the combination of 2H NMR relaxation times’ analysis, 1H NMR relaxometry, and 1H NMR diffusometry was successfully applied to the study of chiral smectogens forming the SmC* and SmC*A phases, with the determination of relevant parameters describing both rotational molecular and internal motions, collective dynamics, and translational self-diffusion motions. Several cases will be reported concerning NMR investigations of chiral ferroelectric and antiferroelectric phases, underlining the great potential of combined NMR approaches to the study of supramolecular, conformational, and dynamic properties of liquid crystals.

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High tilted antiferroelectric liquid crystals: Polymer-based approach for phase stabilisation and device development

Cited by 3 publications

References 44 publications

An orthogonal coupling between liquid crystal layer polarization and externally applied electric field by an SSD liquid crystal

An orthogonal coupling between liquid crystal layer polarization and externally applied electric field by an SSD liquid crystal

Characterization of Hybrid FRP Composite Produced from Recycled PET and CFRP

Supramolecular Arrangement and Conformational and Dynamic Properties of Chiral Smectic Liquid Crystals Obtained through Nuclear Magnetic Resonance: A Brief Review

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