| Event sponsors | This lecture is supported by the Hyp J. Dauben, Jr. Memorial Fund, established in memory of Prof. Dauben by his family, friends, colleagues, and students in 1968.
Hyp J. Dauben, Jr. received bachelor’s and master’s degrees from the Ohio State University and his Ph.D. from Harvard University. He joined the Department of Chemistry at the University of Washington in 1945, and until his death in 1968, he played a major role in the development of the Department’s research facilities. Professor Dauben was internationally renowned for his research on nonbenzenoid aromatic compounds, carbocations, and reaction mechanisms. |
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| Description | Hyp J. Dauben Jr. Endowed Lecture in Organic Chemistry
Chemistry of Dynamic Liquid-Liquid Interfaces Professor Timothy M. Swager - Department of Chemistry, Massachusetts Institute of Technology Host: Al Nelson
This lecture will focus on the design of systems wherein reconfiguration of complex liquid emulsions (droplets) can be triggered chemically or biochemically. The utility of these methods is to generate new transduction mechanisms by which chemical and biological sensors can be developed. Complex liquid droplets behave as optical lens systems and small changes in surface tensions can change focal lengths or cause systems to switch between optically transmissive or scattering states. Central to this scheme is that the fluids in the droplets have different densities and hence are aligned by the earth’s gravity. The induced optical changes can be triggered with chemical, photochemical, or biochemical stimuli and thereby create new generations of sensors. Demonstrations of these methods for the detection of enzyme concentrations, pathogens, and antibodies will be presented. Droplets containing birefringent liquid crystals (LCs), including chiral nematic phases, have been prepared and designer surfactants cause either planar of vertical anchoring at the water-liquid crystal interface. The liquid crystals can be used for precise positioning of magnetic particles and biomolecular elements. Magnetic particles can be used to create novel optical functions, including steering of light and selective reflection, which will be detailed.
Read Prof. Swager's bio
Event recording: https://youtu.be/UpzN-8qm2Vo
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