No abstract

We enhance the electro-optic performance of liquid crystals by dispersing ferroelectric nanoparticles. Devices using these dispersions have lower driving voltages, faster switching speeds and higher contrast ratios. These changes are caused by increases in the dielectric anisotropy, birefringence and elastic constants and can be used to produce improved displays.

Ferroelectric nanoparticle suspensions can enhance the properties of liquid crystals; increasing key parameters such as clearing point, birefringence and dielectric anisotropy. However, these suspensions are difficult to reliably prepare. The interaction between surfactant and ferroelectric particles plays a crucial role in determining the performance and stability of these suspensions. Here we focus on producing ferroelectric nanoparticles using a ball milling process. Using convenient Fourier Transform Infrared Spectroscopy (FTIR) we demonstrate an effective means to monitor the surfactant distribution during the milling process. We also found that the Curie transition from the ferroelectric to paraelectic state of the particles is dependent on both the milling time and surfactant concentrations.