Abstract
Electrical and dielectric properties of iron phthalocyanine (FePc) dispersed E63 nematic LC were investigated using admittance measurements in the frequency range of 100Hz - 20MHz and current measurements in the bias range of 0–20V. 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 (Δε), crossover frequency (fc), real and imaginary parts of dielectric permittivity (ε' and ε") and relaxation time (τ) of the samples were obtained from the experimental data, along with threshold voltage (Vth), splay elastic constant (K11) and conductivity parameters (σac and σdc). Dispersal of FePc and its concentration caused Vth, K11, σdc and fc of the LC composites increase whereas τ 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 σdc values in a way that σdc of the LC composite of E63 with 5% wt/wt FePc is about 53 times larger than that of neat E63.
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