Todos os Eventos

Seminário externo:

Enhanced Diffusion in Nanoscale Materials by an Opposing Flux
Dr. Kwinten Nelissen

Univ. Fed. Ceará & Departement Fysica, Universiteit Antwerpen, Belgium.

Diffusion refers to the process were particles are flowing in the direction of a falling concentration. Till recently this particle flux was found to be slowed down by imposing an opposing flux, but in a recent experiment, this rate was found to be enhanced rather than slowed down by an opposing flux of particles. This means that the self-diffusivity exceeds the transport diffusivity. They rationalized their results by considering the strong intermolecular interaction and the omitting role of inter-cage hopping in mass transfer in the system under study. In this presentation we will show that the enhancement of the diffusion is explained by the strong interparticle interaction and the specific form of the confining geometry. Further an optimal value of the opposing particle flux was found. After increasing the opposing flux further, the particle diffusion slowed down again.