TY - JOUR
T1 - Thermally stimulated depolarization currents and optical transmission on liquid crystal/cellulose derivative composite devices
AU - Rosu, C.
AU - Manaila-Maximean, D.
AU - Godinho, M. H.
AU - Almeida, P. L.
N1 - This work was partially supported by PRAXIS XXI—FCT/MCT Portugal, under research contract POCTI/CTM/2620/95 and FEDER. P. L. Almeida wishes to thank partial support from the PRAXIS program grant no. PRAXIS XXI BD 17071/98.
PY - 2003
Y1 - 2003
N2 - In this paper we examined the electrical and optical properties of a new composite device containing layers of a nematic liquid crystal and cellulose derivative. Using the thermally stimulated depolarization current (TSDC) method we obtained information regarding the conduction mechanism, the activation energy, and the pre-exponential frequency factor in the Arrhenius diagrams. The optical transmission is slightly dependent on the polarization field, and the thermal switch behavior was obtained at the nematic-isotrop transition. When a.c. voltage is applied to the sample, the optical transmission depends strongly on the field amplitude, and a very good contrast is obtained.
AB - In this paper we examined the electrical and optical properties of a new composite device containing layers of a nematic liquid crystal and cellulose derivative. Using the thermally stimulated depolarization current (TSDC) method we obtained information regarding the conduction mechanism, the activation energy, and the pre-exponential frequency factor in the Arrhenius diagrams. The optical transmission is slightly dependent on the polarization field, and the thermal switch behavior was obtained at the nematic-isotrop transition. When a.c. voltage is applied to the sample, the optical transmission depends strongly on the field amplitude, and a very good contrast is obtained.
KW - Activation energy
KW - Cellulose
KW - Nematic liquid crystals
KW - Optical transmission
KW - Thermally stimulated depolarization currents
UR - http://www.scopus.com/inward/record.url?scp=28844449740&partnerID=8YFLogxK
U2 - 10.1080/10587250216170
DO - 10.1080/10587250216170
M3 - Article
AN - SCOPUS:28844449740
VL - 391
SP - 1
EP - 11
JO - Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals
SN - 1542-1406
IS - 1
ER -