COLL 218 |
| Liangfang Zhang, Department of Chemical Engineering, University of Illinois at Urbana-Champaign, 104 S. Goodwin Ave, Urbana, IL 61801 and Steve Granick, Departments of Materials Science and Engineering, of Chemistry, of Physics, and of Chemical and Biomolecular Engineering, University of Illinois, 104 S Goodwin, Urbana, IL 61801. |
| It has been proposed that single-component phospholipids bilayers become dynamically heterogeneous in the presence of adsorbates that retard mobility of phospholipids to which the adsorbate is coordinated. Here we test this hypothesis using fluorescence correlation spectroscopy (FCS) with two-photon excitation, in supported phospholipid bilayers of DLPC (1,2-dillauroyl-sn-Glycero-3-phosphocholine) to which quaternized poly-4-vinylpyridine (QPVP) was exposed. From the autocorrelation function of lipid mobility, we find two diffusion coefficients in this system, one similar to that of lipids in free DLPC bilayers, the other about five times smaller. Further study found that the smaller diffusion corresponded to those bilayers covered by polymer, while the adsorbed polymer had no effect on those uncovered areas. Recent studies will be presented concerning the depending on surface coverage and molar mass of the adsorbate molecules. |
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Posters: Fundamental Research in Surface and Colloid Chemistry
6:00 PM-8:00 PM, Monday, March 29, 2004 Disneyland -- North Exhibit Hall, Poster
Division of Colloid and Surface Chemistry |