Prediction of the density–pressure–temperature behavior in the isotropic–nematic phase transition of MBBA liquid crystal

García-Sánchez, Eduardo; Mendoza-Huízar, Luis Humberto; Ruiz, Francisco Javier Martínez; Pasilla-Díaz, J. R.; Solís-Sánchez, Luis Octavio; Bañuelos-García, Luis Eduardo

doi:10.1007/s12648-020-01826-z

Cited by 3 publications

(1 citation statement)

References 40 publications

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“…Because MBBA exhibits a nematic phase at room temperature, researchers in optoelectronic device technology are very attracted to it. In addition, its low viscosity enables it to be utilized as a lubricant since the friction coefficient remains constant even when the isotropic-nematic phase transition temperature is surpassed [3]. MBBA hydrolyzes rapidly with increasing temperature.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dielectric Properties of Mbba-5cb Nematic Liquid Crystal Structures

Önsal

2022

Mugla Journal of Science and Technology

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The dielectric anisotropy (〖∆ε〗^') is the response of the LC molecules to an applied electric field. In this study, the dielectric properties of 4-pentyl-4'-cyanobiphenyl (5CB) and N-(4-methoxybenzylidene)-4-butylaniline (MBBA) nematic liquid crystals with positive and negative dielectric anisotropy were investigated in detail. In addition, a structure with zero dielectric anisotropy was obtained by mixing MBBA and 5CB liquid crystals in certain rate (1:0.02). The behavior of the samples under 0V and 20V voltages was investigated in detail. Dielectric measurements were made with dielectric spectroscopy technique, which is a powerful method to investigate the molecular interaction mechanisms of liquid crystal materials, at a frequency of 1 kHz-10 MHz and a voltage of 0-20 V at room temperature. Some important parameters such as dielectric anisotropy (∆ε^'), relaxation frequency (f_R), relaxation time (τ) were determined for the samples. When electric field is applied to nematic liquid crystals, it is seen that, depending on the voltage, the relaxation frequency decreases, and the relaxation time increases.

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Section: Introductionmentioning

confidence: 99%

Investigation of Dielectric Properties of Mbba-5cb Nematic Liquid Crystal Structures

Önsal

2022

Mugla Journal of Science and Technology

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Dielectric anisotropy changes in MBBA liquid crystal doped with barium titanate by a new method

Beigmohammadi,

Khadem Sadigh,

Poursamad

2024

Sci Rep

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In response to the burgeoning interest in enhancing the properties of liquid crystal composites, this research systematically explores the intricate interplay between MBBA nematic liquid crystals and ferroelectric barium titanate nanoparticles. The focus is modulating dielectric properties under temperature, frequency, and an applied electric field. Nuanced insights into temperature-dependent behavior, parallel and perpendicular component alterations, and a nonlinear correlation between nanoparticle concentration and dielectric constant are revealed. The study delves into dielectric anisotropy, indicating a reduction with increasing temperature. Structural analyses validate size reduction and crystal phase maintenance of barium titanate nanoparticles (NPs), emphasizing their impact on dielectric characteristics. Frequency-dependent investigations underscore a consistent decline in permittivity with rising frequency across nanoparticle concentrations. Application of an electric field in filling process of liquid crystal cells reveals irregular changes in dielectric constant, holding promise for tailored applications in display technologies. These comprehensive findings offer valuable insights into manipulating dielectric anisotropy properties of MBBA liquid crystal by a simple method for potential advancements in optoelectronic devices and display technologies.

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Design of fractal shaped antenna with MBBA LC material dispersed with ZnO nanoparticles for bandwidth improvement

Prasad,

Pardhasaradhi,

Taraka Phani Madhav

et al. 2024

Zeitschrift Für Naturforschung A

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This article proposes a compact coplanar waveguide (CPW)-fed antenna to improve proposed antenna’s bandwidth without altering its basic design. The proposed fractal shaped antenna comprises a CPW feed with a defective ground structure (DGS). The proposed antenna is operating at single frequency band (C), when the gap between two glass plates is filled with an air and covers two different frequency bands (S and C), when there is a LC material p-methoxy-benzylidene-p-n-butyl aniline (MBBA) with ZnO nanoparticles, further the proposed fractal antenna, resonating from 4.4 to 6 GHz frequency and offers 5.64 dBi peak gain with air gap and operates from 3.1 GHz to 6.8 GHz with a maximum obtained peak gain of 3.9 dBi when filled with MBBA dispersed with ZnO nano particles. IT also evident that the transition temperatures of pure MBBA are reduced when doped with ZnO nano particles. The results are compared and analyzed with the body of data available.

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Prediction of the density–pressure–temperature behavior in the isotropic–nematic phase transition of MBBA liquid crystal

Cited by 3 publications

References 40 publications

Investigation of Dielectric Properties of Mbba-5cb Nematic Liquid Crystal Structures

Investigation of Dielectric Properties of Mbba-5cb Nematic Liquid Crystal Structures

Dielectric anisotropy changes in MBBA liquid crystal doped with barium titanate by a new method

Design of fractal shaped antenna with MBBA LC material dispersed with ZnO nanoparticles for bandwidth improvement

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