Entropic Splitter for Particle Separation

TL;DR

This paper introduces an entropic splitter mechanism that separates particles by size using asymmetric channels and Brownian motion, controllable via channel geometry, with potential microfluidic applications.

Contribution

It proposes a novel particle separation method based on entropic rectification in asymmetric channels, advancing microfluidic particle sorting techniques.

Findings

Particles of different sizes move in opposite directions.

Separation efficiency can be tuned by channel geometry.

Potential for implementation in microfluidic devices.

Abstract

We present a particle separation mechanism which induces motion of particles of different sizes in opposite directions. The mechanism is based on the combined action of a driving force and an entropic rectification of the Brownian fluctuations caused by the asymmetric form of the channel along which particles proceed. The entropic splitting effect shown could be controlled upon variation of the geometrical parameters of the channel and could be implemented in narrow channels and microfluidic devices.