Methods to monitor the polyelectrolyte adsorption employing monolayers of ionic amphiphiles as model surfaces

Monolayers of dioctadecyldimethylammonium bromide (DODA) at the air/water interface were used as a model for a charged surface to study the adsorption of a poly(p-phenylene sulfonate) (PPPS). Utilizing the Fromherz technique it is possible to spread the amphiphile on a pure water surface and subsequ...

Full description

Saved in:
Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2002-02, Vol.198, p.187-193
Main Authors: Schnitter, M., Engelking, J., Menzel, H.
Format: Article
Language:English
Subjects:
LB monolayer
Ordering phenomena
Polyelectrolyte adsorption
Rigid rod-like polyelectrolytes
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Monolayers of dioctadecyldimethylammonium bromide (DODA) at the air/water interface were used as a model for a charged surface to study the adsorption of a poly(p-phenylene sulfonate) (PPPS). Utilizing the Fromherz technique it is possible to spread the amphiphile on a pure water surface and subsequently transfer it onto a polyelectrolyte solution. The ensuing adsorption process was monitored by recording the change in the surface pressure, the change in the reflectivity at the Brewster angle, or by UV/Vis reflection spectroscopy. The first two methods give curves having induction periods, in which no change of the monolayer properties can be observed. However, when UV/Vis reflection spectroscopy is used, no induction period is detected. The induction period is explained to be a result of structural rearrangement processes at the interface due to the adsorption which are a prerequisite for the change in surface pressure and Brewster angle reflectivity.
ISSN:0927-7757
1873-4359
DOI:10.1016/S0927-7757(01)00931-1