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<p>The dielectric properties of cholesteryl oleyl carbonate (COC) liquid crystal are investigated using the cavity perturbation method at a frequency of 20.9&#xa0;GHz under heating conditions. This technique, known for its precision, is particularly effective for analysing small sample sizes. By applying Slater perturbation equations, shift in the resonant frequency and resonance profile width are used to determine the dielectric permittivity and loss. Notably, COC exhibits distinct dielectric behaviour at 20.9&#xa0;GHz compared to 9.0&#xa0;GHz when heated. The comparison suggests that at higher frequencies, the frequency effect surpasses the thermal influence, resulting in reduced entropy change and permittivity, but increased dielectric loss—enhancing conductivity in a manner similar to semiconductors. These findings offer new insights into the effect of high frequency on the dielectric response of COC, making it appropriate for applications such as tunable microwave systems, display technologies, and biocompatible medical devices. The observed dielectric and thermodynamic parameters are significant and are being reported here for the first time.</p>

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Study of dielectric and thermodynamic properties of cholesteryl oleyl carbonate liquid crystal at 20.9 GHz

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Manoj Johri,
  • Saumya Saxena,
  • Sanjeev Johri,
  • Rajesh Sharma

摘要

The dielectric properties of cholesteryl oleyl carbonate (COC) liquid crystal are investigated using the cavity perturbation method at a frequency of 20.9 GHz under heating conditions. This technique, known for its precision, is particularly effective for analysing small sample sizes. By applying Slater perturbation equations, shift in the resonant frequency and resonance profile width are used to determine the dielectric permittivity and loss. Notably, COC exhibits distinct dielectric behaviour at 20.9 GHz compared to 9.0 GHz when heated. The comparison suggests that at higher frequencies, the frequency effect surpasses the thermal influence, resulting in reduced entropy change and permittivity, but increased dielectric loss—enhancing conductivity in a manner similar to semiconductors. These findings offer new insights into the effect of high frequency on the dielectric response of COC, making it appropriate for applications such as tunable microwave systems, display technologies, and biocompatible medical devices. The observed dielectric and thermodynamic parameters are significant and are being reported here for the first time.