A mössbauer study of anisotropic molecular diffusion in the supercooled nematic liquid crystalline phase

Kandpal, M.C.; Bhide, V. G.

doi:10.1016/0378-4363(82)90130-9

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…Being a combination of a soft fluid-like LC material E8 and polymer PEO, at T room , these composites were in their 'glassy'-like state. Note that [40], as well as the temperature of the phase transition from the nematic to isotropic phase for E8LC (T N-I = 72 • C) [41], were beyond the temperature interval from T room to T m .…”

Section: Impedance Spectra Analysismentioning

confidence: 98%

“…Being a combination of a soft fluid-like LC material E8 and polymer PEO, at Troom, these composites were in their 'glassy'-like state. Note that Tg(PEO) = −52 °C; Tm(PEO) = 70.3 °C; Tg(E8) = −98 °C [40], as well as the temperature of the phase transition from the nematic to isotropic phase for E8LC (TN-I = 72 °C) [41], were beyond the temperature interval from Troom to Tm. Figure 1 reports the couples of frequency spectra {Z′, Z″} of the real (Z′) and imaginary (Z″) parts of Z* of the PEO/E8 composite film, simultaneously measured as a function of the frequency f of the AC electric field applied to the film at gradually elevating temperature in twenty equal steps within the range of 22-68 °C.…”

Section: Impedance Spectra Analysismentioning

confidence: 99%

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Ion-Conducting Flexible Thin Films of Composites from Poly(ethylene oxide) and Nematic Liquid Crystals E8—Characterization by Impedance and Dielectric Relaxation Spectroscopy

et al. 2021

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Complex electrical impedance and dielectric spectroscopy were applied to study the dielectric relaxations and their thermal behavior in ion-conducting composites/complexes from polymer poly(ethylene oxide) (PEO) and E8 nematic liquid crystals (LCs), at the compositional ratio PEO:E8 = 70:30 wt%. Flexible thin films of PEO/E8 with a thickness of 150 μm were inspected, as well as such films from Na+ ion-conducting electrolyte PEO/E8/NaIO4 with the same PEO:E8 compositional ratio, but additionally containing 10 wt.% from the salt sodium metaperiodate (NaIO4) as a dopant of Na+ ions. The molecular dynamics, namely the dielectric relaxation of PEO/E8 and PEO/E8/NaIO4, were characterized through analyses of complex impedance and dielectric spectra measured in the frequency range of 1 Hz–1 MHz, under variation of temperature from below to above the glass-transition temperature of these composites. The relaxation and polarization of dipole formations in PEO/E8 and PEO/E8/NaIO4 were evidenced and compared in terms of both electrical impedance and dielectric response depending on temperature. The results obtained for molecular organization, molecular relaxation dynamics, and electric polarization in the studied ion-conducting polymer/LC composites/complexes can be helpful in the optimization of their structure and performance, and are attractive for applications in flexible organic electronics, energy storage devices, and mechatronics.

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Section: Impedance Spectra Analysismentioning

confidence: 98%

Section: Impedance Spectra Analysismentioning

confidence: 99%