Smart Colloidal Materials pp 95-99 | Cite as
Restricted Rotational Diffusion of Non-rigid Dumbbell-Type Macromolecules on Surfaces: Effects of the Bead-Bead and Bead-Surface Interaction
Abstract
A recently derived Difusion equation [Uvarov A, Fritzsche S (2004) J Chem Phys 121(13):6561] is utilized to analyze the restricted rotational motion of macromolecules in solution if they are immobilized on a surface. Both, the bead-bead and bead-surface interactions are taken into account in order to describe the orientational dynamics of non-rigid macromolecules and its relaxation in time after a perturbation has occured. Using several realistic bead-bead and bead-surface potentials, detailed numerical investigations have been carried out for the rotational diffusion coefficient as well as for the conformational phase-space distribution function of the macromolecules. From this phase-space distribution, the orientational correlation function are derived and compared with phenomenological computations from the literature. Such correlation function can be observed in dielectric relaxation and fluorescence depolarization experiments.
Keywords
Correlation functions Diffusion equation Immobilized molecule Rotational diffusion Orientational relaxationPreview
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