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 similar to 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.
Physical Review Letters
Copyright 2006 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.97.147801.
Li, Fenghua; Buchnev, Oleksandr; Il Cheon, Chae; Glushchenko, Anatoliy; Reshetnyak, Victor; Reznikov, Yuriy; Sluckin, Timothy J; West, John L (2006). Orientational Coupling Amplification in Ferroelectric Nematic Colloids. Physical Review Letters 97(14) doi: 10.1103/PhysRevLett.97.147801. Retrieved from https://oaks.kent.edu/chempubs/18