Podgornov, F. V. ; Wipf, R. ; Stühn, B. ; Ryzhkova, A. V. ; Haase, W. (2016)
Low-frequency relaxation modes in ferroelectric liquid crystal/gold nanoparticle dispersion: impact of nanoparticle shape.
In: LIQUID CRYSTALS, 43 (11)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Low-frequency (1 mHz-100 Hz) dielectric relaxation modes were experimentally studied in ferroelectric liquid crystal (FLC)/gold nanoparticles (nanospheres and nanorods) dispersion. It was demonstrated that the dielectric spectra of nanodispersion are strongly influenced by the shape of nanoparticles. Using different formalisms of the impedance spectroscopy, three possible low-frequency relaxation processes were found in the dispersions and the pure FLC. Due to the electrical double layers (EDLs) near nanoparticles and the alignment layers, one can observe the relaxation of the EDL polarisation around the nanoparticles (Schwarz's relaxation) and near the driving indium tin oxide (ITO) electrodes (electrode polarisation). The other possible relaxation process is interfacial polarisation (Maxwell-Wagner mode) in which the frequency is unaffected by the nanoparticles. It was shown that Schwarz's relaxation frequency strongly depended on the shape and size of the nanoparticles. Moreover, dispersion of nanoparticles significantly reduced direct current conductivity of the FLC mixture. GRAPHICS] .
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Podgornov, F. V. ; Wipf, R. ; Stühn, B. ; Ryzhkova, A. V. ; Haase, W. |
| Art des Eintrags: | Bibliographie |
| Titel: | Low-frequency relaxation modes in ferroelectric liquid crystal/gold nanoparticle dispersion: impact of nanoparticle shape |
| Sprache: | Englisch |
| Publikationsjahr: | 2016 |
| Ort: | 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND |
| Verlag: | TAYLOR & FRANCIS LTD |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | LIQUID CRYSTALS |
| Jahrgang/Volume einer Zeitschrift: | 43 |
| (Heft-)Nummer: | 11 |
| Veranstaltungsort: | 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND |
| Kurzbeschreibung (Abstract): | Low-frequency (1 mHz-100 Hz) dielectric relaxation modes were experimentally studied in ferroelectric liquid crystal (FLC)/gold nanoparticles (nanospheres and nanorods) dispersion. It was demonstrated that the dielectric spectra of nanodispersion are strongly influenced by the shape of nanoparticles. Using different formalisms of the impedance spectroscopy, three possible low-frequency relaxation processes were found in the dispersions and the pure FLC. Due to the electrical double layers (EDLs) near nanoparticles and the alignment layers, one can observe the relaxation of the EDL polarisation around the nanoparticles (Schwarz's relaxation) and near the driving indium tin oxide (ITO) electrodes (electrode polarisation). The other possible relaxation process is interfacial polarisation (Maxwell-Wagner mode) in which the frequency is unaffected by the nanoparticles. It was shown that Schwarz's relaxation frequency strongly depended on the shape and size of the nanoparticles. Moreover, dispersion of nanoparticles significantly reduced direct current conductivity of the FLC mixture. GRAPHICS] . |
| Freie Schlagworte: | Ferroelectric liquid crystals; gold nanoparticles; relaxation modes; dielectric spectroscopy; electric double layers |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) > Experimentelle Physik kondensierter Materie |
| Hinterlegungsdatum: | 30 Jan 2017 12:10 |
| Letzte Änderung: | 14 Nov 2023 09:45 |
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