Orientational coupling amplification in ferroelectric nematic colloids |
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Authors: | Li Fenghua Buchnev Oleksandr Cheon Chae Il Glushchenko Anatoliy Reshetnyak Victor Reznikov Yuri Sluckin Timothy J West John L |
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Institution: | Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA. |
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Abstract: | We investigated the physical properties of low concentration ferroelectric nematic colloids, using calorimetry, optical methods, infrared spectroscopy, and capacitance studies. The resulting homogeneous colloids possess a significantly amplified nematic orientational coupling. We find that the nematic orientation coupling increases by approximately 10% for particle concentrations of 0.2%. A manifestation of the increased orientational order is that the clearing temperature of a nematic colloid increases by up to 40 degrees C compared to the pure liquid crystal host. A theoretical model is proposed in which the ferroelectric particles induce local dipoles whose effective interaction is proportional to the square of the orientational order parameter. |
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