Light-induced reorientation and birefringence in polymeric dispersions of nano-sized crystals.
Nanocrystals (50-250 nm) of a Palladium complex within a polyisobutylmethacrylate matrix were prepared by a phase separation method. In these dispersions, a light-induced birefringence with Deltan approximately 10(-3) was induced, without the application of an electric field. This effect was related to the photoconducting properties of the dispersion. Evidence for charge photogeneration without any applied field was obtained. The photorefractive behaviour of the material confirmed that the nanocrystals reorientation is a consequence of photoconducting properties. A light-generated electric field approximaely E 3 V/microm was estimated. These results illustrate the potential of materials with a nano-crystalline dispersion morphology as light-responsive media.
Termine
Roberto
R
LASCAMM , CR-INSTM Unità della Calabria, Laboratorio Regionale Licryl, CNR-INFM, Centro di EccellenzaCEMIF.CAL Dipartimento di Chimica, Università della Calabria, 87036 Rende, Italy.
Aiello
Iolinda
I
Godbert
Nicolas
N
Ghedini
Mauro
M
Golemme
A
A
D001718:Birefringence; D003460:Crystallization; D004553:Electric Conductivity; D005898:Glass; D007834:Lasers; D008027:Light; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D053758:Nanoparticles; D055095:Optics and Photonics; D010777:Photochemistry / Q000379:methods; D011108:Polymers / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods
D011108:Polymers