The Dielectric Properties of 4-propoxy-biphenyl-4-carbonitrile Nematic Liquid Crystal

Abstract

In the present investigation, the temperature dependent measurements of dielectric permittivity for 4-propoxy-biphenyl-4-carbonitrile was reported in the nematic region. Temperature-dependent dielectric characterization was carried out over the frequency range of 1 kHz to 1MHz. The compound shows positive dielectric anisotropy in the nematic phase. The dielectric relaxation frequencies corresponding to the molecular rotation around the long axis were measured as a function of temperature. The activation energy of relaxation process was determined by means of the Arrhenius relation.

Keywords

• Liquid crystal
• nematic
• dielectric permittivity
• activation energy

4-propoxy-biphenyl-4-carbonitrile Nematik Sıvı Kristalinin Dielektrik Özellikleri

Abstract

Bu çalışmada, nematik fazdaki 4-propoxy-biphenyl-4-carbonitrile’in sıcaklığa bağlı dielektrik geçirgenliğinin ölçümleri raporlanmıştır. Bu amaçla 1 kHz ila 1MHz frekans aralığında sıcaklığa bağlı dielektrik karakterizasyonu gerçekleştirilmiştir. Sözü edilen malzeme nematik fazda pozitif dielektrik anizotropik özellik göstermektedir. Ayrıca uzun eksen etrafında molekül rotasyonuna karşılık gelen dielektrik gevşeme frekansları sıcaklığın bir fonksiyonu olarak ölçülmüş ve gevşeme sürecinin aktivasyon enerjisi Arrhenius metodu vasıtasıyla belirlenmiştir.

Keywords

• Sıvı kristal
• nematik
• dielektrik geçirgenlik
• aktivasyon enerjisi

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