Health & Environmental Research Online (HERO)


Print Feedback Export to File
6600555 
Journal Article 
NMR studies of PAH/PSS polyelectrolyte multilayers adsorbed onto silica 
Smith, RN; Mccormick, M; Barrett, CJ; Reven, L; Spiess, HW; , 
2004 
1 
Macromolecules
ISSN: 0024-9297
EISSN: 1520-5835 
AMER CHEMICAL SOC 
WASHINGTON 
37 
13 
4830-4838 
English 
WOS:000222258600014 
Solid-state NMR spectroscopy is used to monitor the layer-by-layer (L-B-L) growth of polyelectrolyte multilayers on colloidal silica. The dynamics and conformation of polyelectrolyte multilayers comprised of the weak polycation, poly(allylamine) hydrochloride, and the strong polyanion, poly(sodium-4-styrene sulfonate), assembled at pH 7 and pH 10 were studied by a combination of H-1 and C-13 NMR measurements. NOESY spectra detect the association of water to the polyanion, while relaxation measurements show that the outermost layer and the water content influence the mobility of the polyelectrolytes and the adsorbed water. Differences in mobility for films assembled at high and neutral pH are explained by the conformation of the polycation during the assembly process. Finally, the strong-weak polyelectrolyte multilayers are compared to a previous NMR study of strong-strong polyelectrolyte multilayers.