Menue

Publications

Authors Mahltig, B. ; Gohy, J.F. ; Jérome, R. ; Pfütze, G. ; Stamm, M.
Title Desorption Behaviour of Regular Adsorbed Polyampholytic Layers
Date 12.08.2003
Number 11573
Abstract The desorption behaviour of the diblock polyampholyte PMAA-b-PDMAEMA, poly(methacrylic acid)-block-poly((dimethylamino)ethyl methacrylate), preadsorbed on silicon substrates was investigated under the influence of several desorption agents. The investigated polyampholyte is known to adsorb in regular structures directly from aqueous solutions onto silicon substrates. While the adsorption process is mainly determined by electrostatic interactions, two kinds of desorption mechanism should be assumed. The first mechanism is based on changed electrostatic conditions caused for instance by a strong change in pH of the aqueous solution. The other mechanism is observed after treatment with hydrophobic organic solvent, which leads to the desorption of hydrophobic adsorbed polyampholyte chains, while the electrostatically attached ones will not be influenced. To complete the desorption experiments with organic solvents also adsorption experiments from analogous polyampholytic solutions in the same organic solvents were performed. The amount of polymer at the substrate surface after adsorption or desorption experiments was determined using ellipsometry. Atomic force microscopy (AFM) was used to investigate the surface topography of dried samples after the desorption process.
Publisher Journal of Polymer Research
Wikidata
Citation Journal of Polymer Research 10 (2003) 69-77
DOI https://doi.org/10.1023/A:1024930219686
Tags adsorption afm desorption ellipsometry micelles polyampholytes polyelectrolytes silicon-water interface polyelectrolyte adsorption diblock polyampholytes polymer adsorption hydrophobic block polystyrene latex molecular-weight charged surface copolymers mi

Back to list