Adsorption of a soluble dye polymer onto spread monolayers

Abstract

We have studied in situ the adsorption of a soluble anionic dye polymer onto spread monolayers by means of reflection spectroscopy. We found that the adsorption is governed by the charge neutrality; the ratio of the adsorbed polymer unit and the cationic monolayer molecule is nearly 1:l for the surface density in the range of 50-77 &/monolayer molecule. On the other hand, no adsorption occurs onto an anionic monolayer. We have also investigated the adsorption kinetics of the polymer. The rate of adsorption can be reproduced very well with a simple diffusion simulation.

Characterization limits of a polymer adsorbed under a monolayer by GIXD measurements

“…The DODA monolayer has already been characterized at the air-water interface by ellipsometry [17], attenuated total reflection [18], reflection spectroscopy [19], and Brewster angle microscopy [20,21], and recently, some grazing incidence Xray diffraction experiments have been reported [22]. Initially, the DODA monolayer is characterized on water in order to establish a reference under the same experimental conditions as those used for the spontaneous polymerization.…”

Piezochromic Effect and Orientational Order in Monolayers and LB Multilayers of Poly(p-phenylenesulfonate)− Dioctadecyldimethylammonium Bromide Complexes

“…The structural changes occurring upon polyelectrolyte adsorption can be used to monitor the adsorption process when a preformed monolayer of ionic amphiphiles is brought into contact with a subphase containing an oppositely charged polyelectrolyte. [14][15][16][17][18] The properties of poly(p-phenylene)s may be applicable for advances in light-emitting diodes. Oriented films of poly(p-phenylene)s are of particular interest in this respect, because of their polarized emission.…”

Adsorption of linear and star-shaped poly(acrylic acid) to model surfaces formed by amphiphiles at the air/water interface

“…The adsorbed amount should increase with a t 1/2 dependency. [2,5] The exact reason for the induction period still remains elusive, however, it has also been observed for other polyelectrolytes, and two possible explanations have been discussed. [9,47] The first explanation relies on the fact that we do not observe the adsorption directly, but we record the change of the surface pressure, which is a consequence of the monolayer reorganization.…”

“…[1] Despite the great scientific and technological interest in the polyelectrolyte adsorption the understanding of the process is still limited. Methods like ellipsometry, [2] surface plasmon spectroscopy, [3,4] or UV/Vis reflectance [5] have been used for the in-situ investigation of the polyelectrolyte adsorption to charged surfaces. Employing monolayers of ionic amphiphiles at the air/water interface is a complementary method to study the adsorption of polyelectrolytes.…”