研究目的
To study some physical properties such as dielectric permittivity, electrical conductivity and relaxation time or activation energy for two systems pure LC [V]6,6, [V]7,6, [V]8,6, [V]6,7, [V]7,7 and [V]8,7 and their doped with silver nanoparticles.
研究成果
The doping of Ag nano particles effectively reduced the permittivity of the LC materials with its large electric dipole moment. The electrical conductivity σ value for pure LC samples in general increases with increasing temperature. The activation energy Ea values show the increase in the activation energy to the doped systems.
研究不足
The study focuses on specific liquid crystalline compounds and their doped versions with silver nanoparticles, limiting the generalizability of the findings to other materials. The experimental conditions (temperature range, frequencies) are fixed, which may not cover all possible scenarios.
1：Experimental Design and Method Selection:
The dielectric behavior of the materials was studied using an LCR meter (hp-4274A) multi-frequency, based heating device hot stage polarizing microscope. The dielectric parameters were measured as a function of temperature range 90°C-160°C at 400 Hz and 4000 Hz.
2：Sample Selection and Data Sources:
Liquid crystalline compounds were synthesized and published in previous work. Silver nanoparticles were prepared by reduction method and identified by XRD, SEM and AFM.
3：List of Experimental Equipment and Materials:
LCR meter (hp-4274A), transparent and highly conducting ITO coated optically flat glass substrates, polyimide PI2555, mylar spacers.
4：Experimental Procedures and Operational Workflow:
Samples were heated to reach isotropic phase, then cooled the parameter of dielectric constant and resistance have been recorded each 10°C.
5：Data Analysis Methods:
The real dielectric permittivity (?) and imaginary dielectric permittivity (ε'') were calculated using specific equations.
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