COLL 99 |
| Weixing Lu, S. Shinder, Hsian-Rong Tseng, J Fraser Stoddart, and Charles M Knobler. Department of Chemistry and Biochemistry, University of California Los Angeles, Hilgard Av, Los Angeles, CA 90095-1569 |
| Devices containing molecular switches based on rotaxane molecules have recently been described. They contain a bistable [2] rotaxane in which a cyclobis (paraquat-p-phenylene) ring can shuttle between two positions on an amphiphilic stopper. The rotaxanes can be spread as monolayers at the air/water interface. Light-scattering microscopy studies of compressed films of such rotaxanes have shown an unusual dynamic collapse process triggered by a highly localized height variation in which a solitary-wave-like structure moves through the film. The disturbance appears only in driven films and relaxes rapidly when the compression is halted. We will describe the phenomenon and discussed possible mechanisms. Work supported by NSF Grant CHE00-7931 and the DARPA Moletronics Program. |
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Symposium in Memory of Arthur W. Adamson
8:30 AM-11:50 AM, Monday, March 29, 2004 Marriott -- Orange County 4, Oral
Division of Colloid and Surface Chemistry |