Rotational and Translational Diffusion of Tobacco Mosaic Virus in Extended and Globular Polymer Solutions

摘要: Depolarized dynamic light scattering is used to measure the translational and rotational diffusion of a rodlike probe, tobacco mosaic virus, in matrix solutions dextran, an extended polymer with some branching, globular Ficoll. Translation rotation both decline almost exponentially as concentration either rises. The ratio similar dextran or Ficoll close values expected from continuum theories friction particles. Reinforcing picture which hydrodynamic effects surpass any due topological constraints, declines motion are inversely proportional solution viscosity. Only modest gradual deviations Stokes−Einstein behavior observed, even at high concentrations. This stands stark contrast earlier study by this group [Macromolecules 1997, 30, 4920−4926]. difference may be traced subtle opt...