Phase diagram, dielectric and electro optic properties of binary liquid crystals mixtures

Meddeb, B.; Ayeb, Habib; Soltani, Taoufik; Guesmi, Ahlem; Hamadi, Naoufel Ben; Jomni, F.

doi:10.1080/02678292.2022.2109768

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…The pure NLC materials compared to other LC materials are of relatively lower cost. Thus, by mixing different NLCs, best switching properties with affordable cost can be attained [6][7][8][9][10][11][12]. Nowadays it is of great interest to design new NLCs or to find new miscible binary mixtures of NLCs of low cost, low viscosity, modest dielectric anisotropy, proper elastic constants, high thermal stability for long-term operation, positive birefringence, and high Nematic to Isotropic transition temperatures (TNI) much higher than room temperature [13].…”

Section: Introductionmentioning

confidence: 99%

Binary Nematic Liquid Crystals Mixture with Enhanced Electro-Optics Properties for Photonic Applications

Hassanein,

Alhaddad,

Ellabban

2024

AJPS

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Purpose: In this work, we mix two simple nematic liquid crystals (NLCs) and investigated the binaryNLCs mixtures of 7CB/PCH5 of different mixing ratios. Methodology: The pure liquid crystals 7CB and PCH5 and binary mixtures of them of high temperature stability were thermally analyzed by differential scanning calorimetry. The mixture 7CB/PCH5:30/70 wt% has the highest thermal stability with a nematic-isotropic (N-I) transition temperature at 50oC. The electrooptic properties of 7CB, PCH5, and the mixture 7CB/PCH5:30/70 wt% at room temperature were also investigated using an amplitude modulated electric signal (1 kHz - 100 Hz) by increasing diving peak voltage from 0 V to 10 V. The threshold volage is relatively reduced for the binary mixture in comparison to that value for PCH5. In comparison to the pure LCs, the mixture 7CB/PCH5:30/70 wt% has the fastest response times of values 2.36 ms total time response, 0.41 ms rise time, and 1.95 ms fall time. It has also the highest contrast ratio. Moreover, it has a maximum measured transmission that is higher than those for PCH5 and 7CB by about 17 % and 8%, respectively, at a field strength of 2V/mm. Findings: The obtained results indicate that the electrooptic properties of PCH5 was improved when mixed with a proper ratio of 7CB, of lower cost, more stablity , and higher potential for photonic applications. Unique Contriburibution to Theory, Practice and Policy: This expermental study shows that simply by mixing two relatively low cost NLCs materials, one of high thermal stability and low electro-optic properties with other one of low thermal stability and better electro-optic properties; this would improve the stability, response, and transmition of the binary mixture. If the a suitable driving method is applied, without doping with other orgnic or inorganic matrial.

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