COLL 397 |
| Zhan Chen, Department of Chemistry, Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, MI 48109 |
| The diffusion of small molecules through polymer materials plays a crucial role in many applications such as polymer coatings, membrane separations, polymer solvation and adhesion. A new nonlinear optical method, sum frequency generation (SFG) vibrational spectroscopy, has been applied to study the diffusion of silane molecules into polymers. SFG is a powerful and versatile, in situ, and submonolayer sensitive surface/interface-specific probe. Our SFG studies demonstrate that it is feasible to monitor interfacial structures at the diffused polymer/silane interface and to then evaluate the polymer/silane diffusion kinetics. We have detected that the molecular order of the polymer/silane interface exists during the whole diffusion process and examined molecular structures of these moving interfaces. Using polymer films of different thickness, we deduced diffusion coefficients of the nanometer scale diffusion of silane molecules into polymers. |
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Nanoscience and Nanotechnology
8:30 AM-11:45 AM, Wednesday, March 31, 2004 Marriott -- Orange County 5, Oral
Division of Colloid and Surface Chemistry |