Synthesis of Helical Polyacetylene under Chiral Nematic Liquid Crystalline Phase
نویسندگان
چکیده
منابع مشابه
Entropy-driven formation of a chiral liquid-crystalline phase of helical filaments.
We study the liquid-crystalline phase behavior of a concentrated suspension of helical flagella isolated from Salmonella typhimurium. Flagella are prepared with different polymorphic states, some of which have a pronounced helical character while others assume a rodlike shape. We show that the static phase behavior and dynamics of chiral helices are very different when compared to simpler achir...
متن کاملPhase Transformations in Chiral Non-racemic Main-chain Liquid Crystalline Polyesters Involving Double-twist Helical Crystals
It is for the first time the double-twisted helical single lamellar crystals were observed in a series of synthetic chiral non-racemic main-chain liquid crystalline polyesters. Phase structure and transition behaviors were investigated. Multiple liquid crystalline phases were found including the twisted grain boundary phase. During crystallization, the chain molecules kept their memory of the p...
متن کاملCommunications: Short-range dynamics of a nematic liquid-crystalline phase.
Using x-ray photon correlation spectroscopy, we studied the dynamics in the nematic phase of a nanorod suspension. The collective diffusion coefficient in the plane perpendicular to the director varies sharply with the wave vector. Combining the structure factor and the diffusion coefficient, we find that the hydrodynamic function of the phase decreases by more than a factor of 10 when going fr...
متن کاملThermotropic biaxial nematic phase in liquid crystalline organo-siloxane tetrapodes.
Infrared absorbance measurements have been carried out on two liquid crystalline organo-siloxane tetrapodes. Results unambiguously show the existence of a biaxial nematic phase below a uniaxial nematic phase. The three components of IR absorbance are used to calculate the various order parameters. On cooling, a weak first-order transition from isotropic to nematic is observed, followed by a sec...
متن کاملThe Phase Transitions from Chiral Nematic toward Smectic Liquid Crystals
A Chen-Lubensky energy is used to investigate phase transitions from chiral nematic to smectic C* and smectic A* liquid crystal phases. We consider a liquid crystalline material Ω confined between two parallel plates, where the dimensions of Ω are assumed to be large relative both to the width of a smectic layer and the material’s chiral pitch. We take boundary conditions so that the smectic ph...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Kobunshi
سال: 1999
ISSN: 0454-1138,2185-9825
DOI: 10.1295/kobunshi.48.599