Investigation of the dielectric properties of polymer-dispersive liquid-crystal films dopated with silicon dioxide nanoparticles

In this work, a measuring system was developed according to the scheme of an AC bridge, with the help of which a constant voltage was applied to polymer-dispersed liquid-crystal films doped with silicon dioxide nanoparticles. For these cells with different content of silicon dioxide nanoparticles, capacitance-voltage measurements were carried out at different frequencies of the alternating voltage generator. For these cells, a memory effect was found, which manifests itself in the hysteresis behavior of the capacitance of these cells. The largest hysteresis area and the largest shift of the cell capacitance in the absence of an external field are observed at 10 kHz. In the entire region under study, with a minimum at a frequency of 10 kHz, the perpendicular component of the permittivity has a pronounced dispersion. It has been established that the content of silicon dioxide nanoparticles affects the permittivity of a polymer-dispersed liquid-crystal cell. The data obtained can be used in the development of energy-independent nanostructured data storage systems.