ac separation of particles by biased Brownian motion in a two-dimensional sieve

I. Derényi, R. Dean Astumian

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

We propose a technique for separation of particles based on a nonlinear coupling between an applied force and the induced transverse drift in a two-dimensional system with broken reflection symmetry transverse to the force. Further, if the system has reflection symmetry parallel to the force, the drift velocity is independent of the sign of the force. Thus, an ac force causes a net drift only in the transverse direction, allowing for efficient separation even in a very small system. In an appropriately constructed device, particles with diffusion coefficients below and above a threshold move in opposite directions, allowing for continuous separation of significant amounts of molecules.

Original languageEnglish
Pages (from-to)7781-7784
Number of pages4
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume58
Issue number6 B
Publication statusPublished - Dec 1998

Fingerprint

sieves
Sieve
Biased
Brownian motion
Reflectional symmetry
Transverse
Two-dimensional Systems
symmetry
Diffusion Coefficient
diffusion coefficient
Molecules
thresholds
causes
molecules

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics

Cite this

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AB - We propose a technique for separation of particles based on a nonlinear coupling between an applied force and the induced transverse drift in a two-dimensional system with broken reflection symmetry transverse to the force. Further, if the system has reflection symmetry parallel to the force, the drift velocity is independent of the sign of the force. Thus, an ac force causes a net drift only in the transverse direction, allowing for efficient separation even in a very small system. In an appropriately constructed device, particles with diffusion coefficients below and above a threshold move in opposite directions, allowing for continuous separation of significant amounts of molecules.

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