title: Self-diffusion of particles in complex fluids: temporary cages and permanent barriers.
abstract: We study self-diffusion in complex fluids within dynamic density functional theory and explicitly account for the coupling to the fluctuating background. Applying the formalism to nematic and smectic liquid crystals, we find the temporary cages formed by neighboring particles to compete with permanent barriers in nonuniform systems, resulting in non-Gaussian diffusive motion that in different directions becomes correlated. Qualitative agreement with recent experiments demonstrates the importance of explicitly dealing with time-dependent self-consistent molecular fields.
authors.affiliation: Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands. m.bier@uu.nl
authors.forename: Markus
authors.initials: M
authors.lastname: Bier
authors.forename: René
authors.initials: R
authors.lastname: van Roij
authors.forename: Marjolein
authors.initials: M
authors.lastname: Dijkstra
authors.forename: Paul
authors.initials: P
authors.lastname: van der Schoot