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Barrera A, Binet C, Dubois F, Hébert PA, Supiot P, Foissac C, Maschke U. Dielectric Spectroscopy Analysis of Liquid Crystals Recovered from End-of-Life Liquid Crystal Displays. Molecules 2021; 26:molecules26102873. [PMID: 34066236 PMCID: PMC8150612 DOI: 10.3390/molecules26102873] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/07/2021] [Accepted: 05/11/2021] [Indexed: 11/24/2022] Open
Abstract
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.
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Affiliation(s)
- Ana Barrera
- CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, Université de Lille, F-59000 Lille, France; (A.B.); (C.B.); (P.S.); (C.F.)
| | - Corinne Binet
- CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, Université de Lille, F-59000 Lille, France; (A.B.); (C.B.); (P.S.); (C.F.)
| | - Frédéric Dubois
- UR 4476, UDSMM, Unité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral Côte d’Opale, 59 379 Dunkerque, France;
| | - Pierre-Alexandre Hébert
- UR 4491, LISIC, Laboratoire d’Informatique Signal et Image de la Côte d’Opale, Université du Littoral Côte d’Opale, 59 379 Dunkerque, France;
| | - Philippe Supiot
- CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, Université de Lille, F-59000 Lille, France; (A.B.); (C.B.); (P.S.); (C.F.)
| | - Corinne Foissac
- CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, Université de Lille, F-59000 Lille, France; (A.B.); (C.B.); (P.S.); (C.F.)
| | - Ulrich Maschke
- CNRS, INRAE, Centrale Lille, UMR 8207—UMET—Unité Matériaux et Transformations, Université de Lille, F-59000 Lille, France; (A.B.); (C.B.); (P.S.); (C.F.)
- Correspondence: ; Tel.: +33-3-20-33-63-81
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