Tuesday, 24 May 2005 - 3:50 PM

This presentation is part of: Surface and Interface Science II

Second Harmonic Generation Probe of Dye Molecules Chemically Bonded to Colloidal Particles

Jun Han, Holly Hofer, Eric Meggers, and Hai-Lung Dai. University of Pennsylvania, Philadelphia, PA

Surface modified colloidal particles have many applications, such as for coating materials, photonics, and biological/pharmaceutical diagnosis. In this study, a process is developed for covalently bonding the para-ethyl red dye to the carboxyl group on the surface of polystyrene carboxylated microspheres. The surface sensitive nonlinear optical probe Second Harmonic Generation (SHG)- is applied to identify the binding of the dye molecules to the microparticle surface.

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