title: Light-induced storage in layer-by-layer films of chitosan and an azo dye.
abstract: The buildup of layer-by-layer (LBL) films from chitosan and the azodye Ponceau-S (PS) was investigated under various experimental conditions, and the resulting films were used in optical storage experiments. The kinetics for the writing process in optical storage was faster for LBL films prepared at low pHs, probably because the films had a larger free volume for isomerization of the chromophores. The nanostructured nature of the LBL films also affected the crystallinity of chitosan, which was considerably decreased in this type of film as chitosan became protonated because of the electrostatic interactions between adjacent layers.
authors: Departamento de Física e Ciência dos Materiais, Instituto de Física de São Carlos, Caixa Postal 369, 13560-970 São Carlos, SP, Brazil.
authors: D S
authors: DS
authors: dos Santos Júnior
authors: A
authors: A
authors: Bassi
authors: J J
authors: JJ
authors: Rodrigues Júnior
authors: L
authors: L
authors: Misoguti
authors: O N
authors: ON
authors: Oliveira Júnior
authors: C R
authors: CR
authors: Mendonça
mesh_terms: D001391:Azo Compounds; D002686:Chitin / Q000031:analogs & derivatives*; D048271:Chitosan; D004396:Coloring Agents; D016249:Optical Storage Devices
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D002686:Chitin; D048271:Chitosan