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High-Frequency Regime of the Acoustical Freédericksz Transition in Nematic Liquid Crystals

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Abstract

A novel approach to the acoustical Freédericksz transition in the high-frequency regime is developed. The prominent role played by bulk viscosities is highlighted. Using experimental data, it is shown that α/α4 = 2.7 × 103, where the combination α ≡ ρ1 + ρ2 + ρ3 + α1 + α4 + α5 + α6 consists of shear and bulk viscosities of a nematic. The magnitude of this ratio is in agreement with what is found in fluids composed by molecules possessing several internal degrees of freedom.

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Acknowledgements

We thank the support of CAPES (Brazilian Agency).

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Authors and Affiliations

  1. Unidade Acadêmica do Cabo de Santo Agostinho, Universidade Federal Rural de Pernambuco, Rua Cento e Sessenta e Três, 300, Garapu, Cabo de Santo Agostinho, Pernambuco, 54518-430, Brazil

    Carlindo Vitoriano

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Correspondence to Carlindo Vitoriano.

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Vitoriano, C. High-Frequency Regime of the Acoustical Freédericksz Transition in Nematic Liquid Crystals. Braz J Phys 49, 17–21 (2019). https://doi.org/10.1007/s13538-018-00626-5

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