Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/49063
Title: Confined brownian ratchets
Author: Malgaretti, Paolo
Pagonabarraga Mora, Ignacio
Rubí Capaceti, José Miguel
Keywords: Química física
Biofísica
Nanotecnologia
Termodinàmica
Física estadística
Entropia
Dinàmica d'una partícula
Biotecnologia
Difusió
Physical and theoretical chemistry
Biophysics
Nanotechnology
Thermodynamics
Statistical physics
Entropy
Dynamics of a particle
Biotechnology
Diffusion
Issue Date: 2013
Publisher: American Institute of Physics
Abstract: We analyze the dynamics of Brownian ratchets in a confined environment. The motion of the particles is described by a Fick-Jakobs kinetic equation in which the presence of boundaries is modeled by means of an entropic potential. The cases of a flashing ratchet, a two-state model, and a ratchet under the influence of a temperature gradient are analyzed in detail. We show the emergence of a strong cooperativity between the inherent rectification of the ratchet mechanism and the entropic bias of the fluctuations caused by spatial confinement. Net particle transport may take place in situations where none of those mechanisms leads to rectification when acting individually. The combined rectification mechanisms may lead to bidirectional transport and to new routes to segregation phenomena. Confined Brownian ratchets could be used to control transport in mesostructures and to engineer new and more efficient devices for transport at the nanoscale.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1063/1.4804632
It is part of: Journal of Chemical Physics, 2013, vol. 138, p. 194906-1-194906-9
Related resource: http://dx.doi.org/10.1063/1.4804632
URI: http://hdl.handle.net/2445/49063
ISSN: 0021-9606
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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