Dielectric Spectroscopy Analysis of Liquid Crystals Recovered from End-of-Life Liquid Crystal Displays

In the present work, the dielectric properties of recycled liquid crystals (LCs) (non-purified, purified, and doped with diamond nanoparticles at 0.05, 0.1, and 0.2 wt%) were investigated. The studied LC mixtures were obtained from industrial recycling of end-of-life LC displays presenting mainly ne...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2021-05, Vol.26 (10), p.2873
Main Authors: Barrera, Ana, Binet, Corinne, Dubois, Frédéric, Hébert, Pierre-Alexandre, Supiot, Philippe, Foissac, Corinne, Maschke, Ulrich
Format: Article
Language:English
Subjects:
Anisotropy
Carbon
Chemical Sciences
Conductivity
Crystals
diamond nanoparticles
Diamonds
Dielectric properties
Electric fields
Electrical properties
End of life
Frequency ranges
Jonscher
LCDs
Liquid crystal displays
Material chemistry
Nanomaterials
Nanoparticles
nematic liquid crystals
Recycling
Room temperature
Spectroscopy
Spectrum analysis
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Summary:In the present work, the dielectric properties of recycled liquid crystals (LCs) (non-purified, purified, and doped with diamond nanoparticles at 0.05, 0.1, and 0.2 wt%) were investigated. The studied LC mixtures were obtained from industrial recycling of end-of-life LC displays presenting mainly nematic phases. Dielectric measurements were carried out at room temperature on a frequency range from 0.1 to 106 Hz using an impedance analyzer. The amplitude of the oscillating voltage was fixed at 1 V using cells with homogeneous and homeotropic alignments. Results show that the dielectric anisotropy of all purified samples presents positive values and decreases after the addition of diamond nanoparticles to the LC mixtures. DC conductivity values were obtained by applying the universal law of dielectric response proposed by Jonscher. In addition, conductivity of the doped LC mixtures is lower than that of the undoped and non-purified LC.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules26102873