Selectivity in binary fluid mixtures: static and dynamical properties
journal contributionposted on 08.10.2014, 13:08 by Roland Roth, Markus Rauscher, Andrew ArcherAndrew Archer
Selectivity of particles in a region of space can be achieved by applying external potentials to influence the particles in that region. We investigate static and dynamical properties of size selectivity in binary fluid mixtures of two particles sizes. We find that by applying an external potential that is attractive to both kinds of particles, due to crowding effects, this can lead to one species of particles being expelled from that region, while the other species is attracted into the region where the potential is applied. This selectivity of one species of particle over the other in a localized region of space depends on the density and composition of the fluid mixture. Applying an external potential that repels both kinds of particles leads to selectivity of the opposite species of particles to the selectivity with attractive potentials. We use equilibrium and dynamical densityfunctional theory to describe and understand the static and dynamical properties of this striking phenomenon. Selectivity by some ion channels is believed to be due to this effect.
A.J.A. acknowledges financial support from the British Council, funded under the ARC program, and also from RCUK. M.R. acknowledges financial support from the priority program SPP 1164 of the Deutsche Forschungsgemeintschaft. M.R. and R.R. acknowledge financial support from DAAD funded under the PPP program.
- Mathematical Sciences