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National Capital Section

15 March 2003, Eisenhower Metro Holiday Inn, Alexandria, VA

Title of Lecture: Surface Engineering and Microscopy of Corroding and Reactive Surfaces
Speaker: William H. Smyrl, University of Minnesota, Corrosion Research Center, Department of Chemical Engineering and Materials Science, Minneapolis, MN

The focus of the speaker's discussion was on the development and use of microscopy on reactive and reacting heterogeneous surfaces. There is both practical and fundamental interest in such measurements. The practical interest relates to the stability and reliability of microstructures - especially assemblies of diverse materials and functional structures. With decreasing size of individual components and features of such structures, the need increases for improved resolution capabilities coupled with chemical characterization. In parallel to practical interests is the need to understand the fundamental processes and interactions on heterogeneous surfaces. The role of reactions that are coupled by different parts of the surface, for example, and the influence of materials selection and processing on the reactions are questions that drive the research. The reactivity and progress of reactions is monitored spatially and temporally by microscopy measurements.

The use of near field scanning optical microscopy (NSOM) allows the concurrent acquisition of topography and optical images with resolution in the range of 10 - 50 nanometers. Numerous processes of interest require imaging in solution in order to explore reaction kinetics. The development of a tuning fork controlled system on the NSOM instrument has resulted in a stable and reliable feedback in solution with a variety of tips for functional imaging.  We will discuss the use of fluorescence imaging, electrochemical imaging, photoelectrochemical imaging, and spectroscopic imaging with the NSOM to both probe and to form textured and tailored surfaces for technological applications.

Twelve attendees came to the March meeting (13 total including speaker)




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