"Effect of lamellar nanostructures on the second harmonic generation of polymethylmethacrylate films doped with 4-(4-nitrophenylazo)aniline chromophores". A. Franco, L. Romero-Miranda, G. Valverde-Aguilar, J. García-Macedo, G. Brusatin, M. Guglielmi. arXiv:1111.4531
The kinetics of the orientation of Disperse Orange 3 molecules embedded in amorphous and nanostructured
Polymethylmethacrylate films was studied under the effect of an intense electrostatic poling field. Non-centrosymmetric chromophore distributions were obtained in Polymethylmethacrylate films by Corona poling technique. These distributions depends on the Corona poling time. The changes in the orientation of the Disperse Orange 3 molecules were followed by in-situ transmitted Second Harmonic Generation measurements. The Second Harmonic Generation signal was recorded as function of time at several temperatures; it was fitted as function of the Corona poling time, considering matrix-chromophore interactions. The Polymethylmethacrylate films were nanostructured by the incorporation of an anionic surfactant, the Sodium Dodecyl Sulfate. The lamellar nanostructures in the films were identified by X-ray diffraction measurements.
Polymethylmethacrylate films was studied under the effect of an intense electrostatic poling field. Non-centrosymmetric chromophore distributions were obtained in Polymethylmethacrylate films by Corona poling technique. These distributions depends on the Corona poling time. The changes in the orientation of the Disperse Orange 3 molecules were followed by in-situ transmitted Second Harmonic Generation measurements. The Second Harmonic Generation signal was recorded as function of time at several temperatures; it was fitted as function of the Corona poling time, considering matrix-chromophore interactions. The Polymethylmethacrylate films were nanostructured by the incorporation of an anionic surfactant, the Sodium Dodecyl Sulfate. The lamellar nanostructures in the films were identified by X-ray diffraction measurements.
Se estudió la cinética de la orientación de las moléculas de Disperse Orange 3 inmersas en películas amorfas y nanoestructuradas de Polimetilmetacrilato bajo el efecto de un campo de polarización electrostático intenso. Se obtuvieron distribuciones no centrosimétricas de los cromóforos en las películas de Polimetilmetacrilato por medio de la técnica de polarización Corona. Tales distribuciones dependen del tiempo de polarización Corona. Los cambions en la orientación de las moléculas de Disperse Orange 3 fueron monitoreadas a través de mediciones in-situ de Generación de Segundo Armónico transmitido. La señal de Generación de Segundo Armónico fue registrada como función del tiempo a distintas temperaturas, y fue ajustada como función del tiempo de polarización Corona considerando interacciones matriz-cromóforo. Las películas de Polimetilmetacrilato se nanoestructuraron mediante la incorporación del surfactante aniónico Dodecil Sulfato de Sodio. Las nanoestructuras lamelares en las películas fueron identificadas mediante mediciones de difracción de rayos X.
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