par Brouette, Nicolas 
;Xue, Changying;Moulin, Martine;Haertlein, M;Fragneto, G.;Leckband, Deborah E;Halperin, Avraham;Sferrazza, Michele
Référence The European physical journal. Special topics, 213, 1, page (343-353)
Publication Publié, 2012
;Xue, Changying;Moulin, Martine;Haertlein, M;Fragneto, G.;Leckband, Deborah E;Halperin, Avraham;Sferrazza, Michele Référence The European physical journal. Special topics, 213, 1, page (343-353)
Publication Publié, 2012
Article révisé par les pairs
| Résumé : | The structure of dense poly(N-isopropylacrylamide) (PNIPAM) brushes and oligo(ethylene glycol) (OEG) monolayers has been probed using neutron reflectometry and ellipsometry. The PNIPAM brush is swollen below the Lower Critical Solution Temperature (LCST) of 32 {ring operator}C and is collapsed at 37 {ring operator}C. Neutron reflectivity shows that below the LCST, the brush is described by a two-layer model: an inner dense layer and a hydrated outer layer. Above the LCST the collapsed brush forms a homogenous layer. With a fully deuterated myoglobin protein to increase the neutron scattering length density contrast, the reflectivity data show no detectable primary adsorption on the grafted OEG surface. A bound on the ternary adsorption onto PNIPAM chains forming dense brushes below and above the LCST is obtained. © 2012 EDP Sciences and Springer. |
