Low frequency dielectric relaxations of gold nanoparticles/ferroelectric liquid crystal composites

Alumina nanoparticles find an application to reduce the ionic effects of ferroelectric liquid crystal

“…The low-frequency peak has been shifted towards the low-frequency side by applying dc bias. The shifting of the low-frequency peak towards the low-frequency side has already been explained by us [21]. The suppression of ionic contributions of KCFLC 7S material has further been confirmed by observing the behaviour of electrical resistance (R) of pure and AL-NPs doped KCFLC 7S material.…”

“…The main collective processes involve GM, connected with the phase fluctuations in the azimuthal orientation of the director and soft mode due to fluctuations in the amplitude of the tilt angle [18][19][20]. The appearance of the low-frequency mode in KCFLC 7S material has been studied earlier and was attributed to the ionization-recombination assisted diffusion of slow ions in planar alignment configuration [21]. The presence of ionic impurities within the FLC material is visible as a distinct peak at room temperature which shifted to higher frequencies on increasing the temperature and ultimately merges with GM near SmC*-SmA* transition.…”

Exfoliation of graphene oxide and its application in improving the electro-optical response of ferroelectric liquid crystal

“…The relaxation aroused at low frequency regime ($100 Hz) generally occurs due to the presence of undesired ionic impurities in the FLC mixture itself. 19,31,32 Also, it may be observed that this low frequency relaxation is enhanced remarkably in case of GO doped samples and is found greater for "as synthesized" GO doped FLC sample. Such enhancement has been observed due to the presence of ionic contamination in GO and such impurities are obviously remarkable in case of "as synthesized."…”

Nanocomposites Based on Liquid Crystal Polymers and Inorganic Nanoparticles

“…В обоих случаях существуют определенные ограничения, относящиеся к размеру и форме НЧ. Как было показано в [13], сферическая форма НЧ приводит к уменьшению температуры перехода N-I (T N-I ), тогда как в нематиках с внедренными сильно анизотропными наночастицами T N-I увеличивается [14]. Эти эффекты объяснили с помощью теоретических исследований, которые привели к основным концепциям, касающихся НЧ, распределенных в анизотропной среде [21,23].…”

“…Другая группа самоорганизованных матриц для наночастиц представлена низкомолекуляр-ными жидкими кристаллами [10][11][12][13][14][15] и ЖК-поли-мерами [16][17][18][19][20]. Такие нанокомпозиты обладают новыми свойствами, отличающимися от свойств входящих в их состав жидких кристаллов и наночастиц.…”