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Colloid Probe AFM and XPS Study of Time‐Dependent Aging of Amine Plasma Polymer Coatings in Aqueous Media
Author(s) -
Tarasova Anna,
HamiltonBrown Paul,
Gengenbach Thomas,
Griesser Hans J.,
Meagher Laurence
Publication year - 2008
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.200700054
Subject(s) - x ray photoelectron spectroscopy , aqueous solution , polymer , colloid , chemical engineering , materials science , dlvo theory , quenching (fluorescence) , contact angle , amine gas treating , allylamine , chemistry , analytical chemistry (journal) , organic chemistry , composite material , polyelectrolyte , fluorescence , physics , quantum mechanics , engineering
Effects of surface oxidation on the properties of amine plasma polymer (pp) films in aqueous media have not been widely studied, despite their use to control bio‐interfacial properties. Changes in the surface composition of allylamine and heptylamine pp films, on water exposure, were followed by XPS. The surface potential was monitored via AFM measurements and comparison to DLVO theory. Analysis of XPS data implied high initial oxidation rates (rapid quenching of surface radicals). Oxidation of the pp films followed evolution of carbon‐based rather than nitrogen‐based species. Analysis of AFM force data showed changes in the sign of the surface potential with aging from positive to negative. Implications, for example for surface immobilization of molecules in aqueous environments, are also discussed.