研究目的
Investigating the capacitive method of measurement of DC conductivity in liquid crystal layers for application in tactile pressure sensors.
研究成果
The capacitive method of DC conductivity measurement was successfully extended to characterize liquid crystals in cells with blocking electrodes. This technique, based on analyzing the interfacial polarization relaxation, provides physically correct results showing an increase in conductivity with temperature.
研究不足
The upper frequency of measurements is limited by the 'ITO mode' appearing due to the Maxwell relaxation of the empty cell. The method assumes thin alignment layers and absence of other relaxation processes in the frequency range of interest.
1：Experimental Design and Method Selection:
The study employs a capacitive method to measure the DC conductivity in liquid crystal layers confined in cells with blocking electrodes. The method is based on analyzing the capacitive part of the dielectric response.
2：Sample Selection and Data Sources:
A ferroelectric liquid crystal (FLC) mixture (CHS1) is used, confined in a cell with blocking electrodes. The cell provides planar alignment of FLC.
3：List of Experimental Equipment and Materials:
Impedance spectrometer (Alfa System, Novocontrol), UV-VIS Cary 300 spectrometer, FLC mixture CHS
4：Experimental Procedures and Operational Workflow:
Dielectric properties are investigated in a frequency range of 1 mHz-200 kHz at different temperatures. The complex dielectric spectra are derived from impedance spectra.
5：Data Analysis Methods:
The DC conductivity is estimated from the parameters of the interfacial polarization relaxation retrieved from the imaginary part of the conductivity spectrum and the real part of the dielectric spectrum.
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