Dynamics and Structure of Layer-by-Layer Films

摘要

Quantitative studies of the diffusion of polyelectro-lytes within LbL-assembled films revealed several features. First, the propensity of films to layer intermixing in salt solutions was strongly, dependent on polyelectrolyte molecular weight (barrier-like). Films assembled with the shortest polyelectrolyte chains demonstrated significant center-of-mass diffusion of assembled polyelectrolyte chains in the perpendicular-to-the-substrate direction when annealed in solutions with moderate salt concentrations. This study reveals that the diffusion coefficients of assembled PMAA chains in the direction parallel to the substrate rose exponentially with increased salt content.