[en] The adsorption of poly(N-isopropylacrylamide) (PNIPAAM), a well known thermosensitive polymer, on glass was investigated by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The polymer was dissolved in water at low (0.02 g/L) and high (2 g/L) concentration and the tested temperatures were below (25 degreesC) and above (50 degreesC) the lower critical solubility temperature (LCST). Whatever the conditions, a smooth layer of adsorbed molecules spread along the surface was observed. The thickness was about twice higher for high concentration compared to low concentration. The cohesion in the adsorbed layer, as revealed by scraping tests performed by AFM, was higher above the LCST than below the LCST. On top of this adsorbed layer, single-chain coils, globules, or aggregates were present, depending on concentration and temperature. The observation of these additional adsorbed entities was poorly reproducible, presumably due to the lack of shear control upon rinsing. These results emphasize the importance of the characterization of surface morphology to interpret amounts of adsorbed polymers. (C) 2004 Elsevier Inc. All rights reserved.
Research Center/Unit :
CEIB - Centre Interfacultaire des Biomatériaux - ULiège
Disciplines :
Physics Chemistry
Author, co-author :
Callewaert, M.
Grandfils, Christian ; Université de Liège - ULiège > Biochimie et physiologie générale
Boulange-Petermann, L.
Rouxhet, P. G.
Language :
English
Title :
Adsorption of poly (N-isopropylacrylamide) on glass substrata
Publication date :
15 August 2004
Journal title :
Journal of Colloid and Interface Science
ISSN :
0021-9797
eISSN :
1095-7103
Publisher :
Academic Press Inc Elsevier Science, San Diego, United States - California
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Bibliography
Harvey J.A. Kroschwitz J.I., Howe-Grant M. Encyclopedia of Chemical Technology. 1995;502 Wiley, New York
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