Effect of iron phthalocyanine (FePc) concentration on electrical and dielectric properties of the nematic liquid crystal composites
Yükleniyor...
Dosyalar
Tarih
2016
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Electrical and dielectric properties of iron phthalodyanine (FePc) dispersed E63 nematic LC were investigated using admittance measurements in the frequency range of 100 Hz - 20 MHz and current measurements in the bias range of 0-20 V. In order to observe the effect of FePc concentration, E63 was dispersed with 1,3 and 5% wt/wt FePc. Basic dielectric parameters such as dielectric anisotropy (Delta epsilon), crossover frequency (f(c)); real and imaginary parts of dielectric permittivity (epsilon' and epsilon") and relaxation time (tau) of the samples were obtained from the (sigma(ac) sigma(dc)). experimental data, along with threshold voltage (V-th), splay elastic constant (K-11) and conductivity parameters (sigma(ac) sigma(dc)). Dispersal of FePc and its concentration caused V-th, K-11, sigma(dc), and f(c) of the LC composites increase whereas tau is lowered. LC composites were found to exhibit relaxation in low and high frequency regions such that the former was masked due to high conductivity in the samples and hence electric modulus formalism was applied to determine low frequency relaxation. Prominent effect of FePc dispersal was found in sigma(dc) values in a way that sigma(dc) of the LC composite of E63 with 5% wt/wt FePc is about 53 times larger than that of neat E63. (C) 2016 Elsevier B.V. All rights reserved.
Açıklama
YILDIRIM, Mert/0000-0002-8526-1802
WOS: 000386986300104
WOS: 000386986300104
Anahtar Kelimeler
Metallophthalocyanines, Nematic liquid crystals, Dielectric properties, Dielectric relaxation, Electrical conductivity
Kaynak
Journal Of Molecular Liquids
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
223
