Physical Review Letters
liquid-crystals, particles, dispersions, suspensions, size
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.
Li, Fenghua; Buchnev, Oleksandr; Il Cheon, Chae; Glushchenko, Anatoliy; Reshetnyak, Victor; Reznikov, Yuri; Sluckin, Timothy J.; and West, John L. (2006). Orientational Coupling Amplification in Ferroelectric Nematic Colloids. Physical Review Letters 97(14). doi: 10.1103/PhysRevLett.97.147801 Retrieved from http://digitalcommons.kent.edu/chempubs/18