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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 85: Focus: Polymers under confinement I

CPP 85.7: Vortrag

Donnerstag, 19. März 2020, 12:00–12:15, ZEU 222

Confined polymer dynamics: an effective model for polymer transport in porous materials — •Paolo Malgaretti — Max Planck Institute for Intelligenst Systems

We study the translocation of polymers across varying-section channels. Using systematic approximations, we derive a simplified model that reduces the problem of polymer translocation through varying-section channels to that of a point-like particle under the action of an effective potential. Such a model allows us to identify the relevant parameters controlling the polymer dynamics and, in particular, their translocation time. By comparing our analytical results with numerical simulations we show that, under suitable conditions, our model provides reliable predictions of the dynamics of both Gaussian and self-avoiding polymers, in two- and three-dimensional confinements. Moreover, both theoretical predictions, as well as Brownian dynamic results, show a non-monotonous dependence of polymer translocation velocity as a function of polymer size, a feature that can be exploited for polymer separation.

[1] V.Bianco, P.Malgaretti JCP 145, 114904 (2016)