Memorias de investigación
Artículos en revistas:
The peculiar electrical response of liquid crystal-carbon nanotube systems as seen by impedance spectroscopy
Año:2015
Áreas de investigación
  • Cristales liquidos,
  • Fulerenos y nanotubos de carbón
Datos
Descripción
Conductive nanoparticles, especially elongated ones such as carbon nanotubes, dramatically modify the electrical behavior of liquid crystal cells. These nanoparticles are known to reorient with liquid crystals in electric fields, causing significant variations of conductivity at minute concentrations of tens or hundreds ppm. The above notwithstanding, impedance spectroscopy of doped cells in the frequency range customarily employed by liquid crystal devices, 100 Hz?10 kHz, shows a relatively simple resistor/capacitor response where the components of the cell can be univocally assigned to single components of the electrical equivalent circuit. However, widening the frequency range up to 1 MHz or beyond reveals a complex behavior that cannot be explained with the same simple EEC. Moreover, the system impedance varies with the application of electric fields, their effect remaining after removing the field. Carbon nanotubes are reoriented together with liquid crystal reorientation when applying voltage, but barely reoriented back upon liquid crystal relaxation once the voltage is removed. Results demonstrate a remarkable variation in the impedance of the dielectric blend formed by liquid crystal and carbon nanotubes, the irreversible orientation of the carbon nanotubes and possible permanent contacts between electrodes.
Internacional
Si
JCR del ISI
Si
Título de la revista
Journal of Physics D-Applied Physics
ISSN
0022-3727
Factor de impacto JCR
2,521
Información de impacto
Datos JCR del año 2013
Volumen
48
DOI
Número de revista
Desde la página
375302
Hasta la página
375302-8
Mes
AGOSTO
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Departamento: Tecnología Fotónica y Bioingeniería