8 papers
Shear-mode Direct Piezoelectric Response of Ferroelectric Nematic Liquid Crystals
Péter Salamon, Marcell Tibor Máthé, Hiroya Nishikawa +2
Piezoelectricity (linear coupling between mechanical deformation and electric signal) was originally observed only in solid crystals. Recently, it was discovered that liquid ferroe…
Electrically Tunable Heliconical Smectic Superstructure in Polar Fluids
Hiroya Nishikawa, Dennis Kwaria, Atsuko Nihonyanagi +3
The ferroelectric nematic (NF) phase and related polar liquid-crystalline phases form a new class of strongly polarized yet fluid soft matter. Well-recognized heliconical ferroelec…
Direct measurement of osmotic pressure and interparticle interactions in colloidal dispersions
Keita Saito, Fumito Araoka
Colloidal dispersions are widely found in systems ranging from natural environments to industrial materials. Their macroscopic properties such as viscosity and light scattering dep…
Three-Dimensional Hieratical Twists in Polar Fluids: Chirality Regulation by Ultra-Low Electric Field
Hiroya Nishikawa, Dennis Kwaria, Atsuko Nihonyanagi +1
Recently discovered helical polar fluid adopts a spontaneous chiral symmetry breaking (CSB) driven by polarization escape and conformational chirality. Ferroelectric nematic and sm…
Spontaneous Twist of Ferroelectric Smectic Blocks in Polar Fluids
Hiroya Nishikawa, Yasushi Okumura, Dennis Kwaria +2
In soft matter, the polar orientational order of molecules can facilitate the coexistence of structural chirality and ferroelectricity. The ferroelectric nematic (NF) state, exhibi…
Giant Electro-Viscous Effects in Polar Fluids with Paraelectric-Modulated Antiferroelectric-Ferroelectric Phase Sequence
Hiroya Nishikawa, Péter Salamon, Marcell Tibor Máthé +2
The recently discovered ferroelectric nematic liquid-crystal material DIO exhibits an antiferroelectric (AF) phase, characterized by a sinusoidally modulated structure between the…