Open Conference Systems, StatPhys 27 Main Conference

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Transport of colloids along a wiggling channel
Andrea Soledad Gotting, Maria Florencia Carusela, Paolo Malgaretti, José Miguel Rubi

##manager.scheduler.building##: Edificio Santa Maria
##manager.scheduler.room##: Auditorio San Agustin
Date: 2019-07-10 12:00 PM – 03:45 PM
Last modified: 2019-06-14

Abstract


Based on previous works [1, 2], we study numerically the transport of colloidal particles under the effect of corrugated time-dependent confinements. Confinement changes significantly the transport properties that yield a nontrivial contribution to the dynamics that manifests in the appearance of entropic forces in the Fick-Jacobs equation [3]. In particular, time dependent confinements can introduce an additional characteristic time scale, resulting in different transport regimes.

We simulate the transport of colloids, modeled as brownian particles, along a varying in time cross section channel and under the action of an external force.  We study the particle current and conditions for an anomalous diffusion.  We also study analytically a simplified model to explain the interplay between time scales and their role on the flow. The theoretical results are checked with the numerical simulations.

Our model can be used to understand transport of colloidal particles in peristaltic biological channels and microfluidic devices.

[1] Carusela M.F, Rubi M.J. , J. Chem. Phys. 146, 184901 (2017)

[2] Carusela M.F, Rubi M.J. , Journal of Physics: Condensed Matter, 24 (2018)

[3] D. Reguera D.,  Rubí J.M.,  Phys. Rev. E 64, 061106 (2001)