Fluorescencing behavior of thin solid films based on polyelectrolyte‐surfactant complex and dye molecules

Abstract

This article is devoted to investigation of interaction between polycomplex and dye molecules assembled in fluorescent thin solid Langmuir-Blodgett (LB) films. Preparation procedure of organosoluble stoichiometric polycomplex based on cationic polyelectrolyte and anionic surfactant is described. Formation of mixed monolayers consisting of polyelectrolyte-surfactant complex (PSC) and dye molecules-Nile Red (NR) at water-air interface is shown. Assembling conditions of LB films based on PSC and NR are defined and the spectral-luminescent properties of obtained films are studied. It is shown that when nonamphiphilic NR and PSC are mixed the excellent monolayers formed, which can easily be transferred onto solid substrates by Langmuir-Blodgett method with a high transfer coefficient. Absorption and fluorescence spectra of mixed LB films reveal the formation of dimers and existence of monomers in LB films.

Physicochemical Properties of Hydrophobically Modified Polymeric Betaines and of Their Langmuir‐Blodgett Films

“…To maintain the required density of polymeric monolayers in the course of their transfer onto solid substrate the stability of films was studied by the method of fixation of the changing of surface pressure at constant area of monolayer during 120 minutes . In this case the 0.2 mL of polybetaine solution was spreaded onto subphase surface.…”

“…[27,28] In this case the 0.2 mL of polybetaine solution was spreaded onto subphase surface. After 30 min the monolayer was compressed up to 30 mN Á m À1 and the change of p was recorded.…”