COLL 187 |
| Michelle C. Rini, Department of Chemistry, Mighigan State University, East Lansing, MI 48824 and Gary J. Blanchard, Department of Chemistry, Michigan State University, East Lansing, MI 48824. |
| Second-order nonlinear optical measurements are well suited to the characterization of interfacial adlayers because of the intrinsic surface-selectivity of this technique. We have constructed a diffraction-limited, surface second harmonic imaging system to examine the spatial distribution of c(2)-active chromophores bound to the silica/air interface. The monolayers of interest are comprised of a variable amount of chromophore, ranging between 10% and 100% of the monolayer. Using these monolayer interfaces, we have characterized their concentration-dependent morphology. At issue in this work is whether or not adlayer deposition occurs randomly at the interface, if growth is keyed to the mesoscopic substrate morphology, or proceeds by self-aggregation, dependent upon the solution from which the adlayer is deposited. At present, all of these issues remain to be understood. |
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Adsorption of Macromolecules at Liquid-Solid Interfaces
Division of Colloid and Surface Chemistry |