Quantifying adhesion bond parameters to distinguish interactions of hydrophilic and hydrophobic blocks of polystyrene-poly-2-vinylpyridine with a silicon nitride surface.
An analysis of the loading rate dependence of the forces required to rupture an AFM tip from a block copolymer surface has provided insight into the structure of the surface-macromolecule contact, differentiation of the block contacting the tip, a measure of the polymer-surface binding energy, and the rigidity of the contact. Polystyrene-poly-2-vinylpyridine block copolymers were studied adsorbing to silicon nitride. Polystyrene makes stiff van der Waals contact with the silicon nitride surface in aqueous solution, while the bond of poly-2-vinylpyridine to the surface is more flexible and may involve a bridging water.
Meadows
Pamela Y
PY
Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, Asylum Research, Santa Barbara, California 93117-5550, USA.
Bemis
Jason E
JE
Walker
Gilbert C
GC