COLL 384 |
| It is well known that polyelectrolyte solutes perturb the properties of nearby solvent molecules from their bulk values. Disruption of hydrogen bonding in and decreased dielectric constants for water are mediated by the electric potential created by the associated ion condensation layer on the surface of the charged polyelectrolyte. These effects can be monitored via the nuclear magnetic resonance (NMR) spectra of monovalent I = 3/2 ions like 23Na+, 39K+, 35Cl–, and 79Br–. Pf1 bacteriophage forms a nematic liquid crystalline phase for concentrations greater than 5 mg/mL. This results in incomplete spatial averaging of NMR spin Hamiltonians and recovery of distance information into the liquid state spectrum. Residual quadrupolar splitting and relaxation parameters of the I = 3/2 ions dissolved into Pf1/water solutions are used to probe polyelectrolyte properties. The implications of these measurements towards the disruption of hydrogen bonding in water will be mentioned. |
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Water at Interfaces
8:30 AM-11:40 AM, Tuesday, 12 September 2006 Sir Francis Drake -- Tudor Room, Oral
Division of Colloid & Surface Chemistry |