Dielectric spectroscopy and electrical conductivity measurements on high-tilted antiferroelectric materials

Nepal, Shantiram; Das, Bidisa; Das, Malay Kumar; Strójwąs, Katarzyna; Urbańska, Magdalena

doi:10.1080/01411594.2020.1813288

Cited by 4 publications

(1 citation statement)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature dependence of the parallel and perpendicular permittivity’s (ε || and ε ⊥ ) and their average value ε avg = (2ε ⊥ + ε || )/3 for the (Compound A + Compound B) system is shown in Figure 4 a–c, respectively. Figure 4 b shows that ε ⊥ values peak in the SmC* phase (~19–28); this enhanced value is due to the temperature-dependent fluctuations of molecules in the direction of the phase angle of the helical structure [ 69 , 70 , 71 , 72 , 73 , 74 , 75 ]. The increment of ε ⊥ is greater than ε || in the SmC* phase.…”

Section: Resultsmentioning

confidence: 99%

Static Permittivity and Electro-Optical Properties of Bi-Component Orthoconic Antiferroelectric Liquid Crystalline Mixtures Targeted for Polymer Stabilized Sensing Systems

Nepal¹,

Das²,

Das

et al. 2022

Polymers

Self Cite

View full text Add to dashboard Cite

The behavior of two newly formulated bi-component orthoconic antiferroelectric liquid crystalline (OAFLC) systems, i.e., the Compound A + Compound B mixture system and Compound C + Compound B mixture system has been discussed in light of temperature and concentration dependencies of helical pitch length, spontaneous polarization, relaxation time, bulk viscosity, and the anchoring energy strength coefficient, together with static dielectric permittivity (ε) and dielectric anisotropy. Compound A + Compound B mixtures possess spontaneous polarization between 190–340 nC.cm−2 and fast relaxation times between 190–320 µs in the smectic antiferroelectric SmCA* phase at room temperature. Compound C + Compound B mixtures also have a spontaneous polarization in the range of 190–280 nC.cm−2 and relaxation times in the range of 190–230 µs at room temperature. Most of the mixtures have a helical pitch below one micrometer in the SmCA* phase. These advanced mixtures show a broad temperature range of the antiferroelectric SmCA* phase, fast switching of molecules under an applied electric field, negative dielectric anisotropy and a short helical pitch, confirming the advantage of designing new polymer-stabilized OAFLC that is targeted for novel application in sensing devices, utilizing the fast responsive electro-optical modulation elements.

show abstract