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Sorting on periodic surfaces
Lacasta Palacio, Ana María; Sancho, Jose Maria; Romero, A. H.; Lindenberg, K.
Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. NOLIN - Física No-Lineal i Sistemes Fora de l'Equilibri
Particles moving on crystalline surfaces and driven by external forces or ffow ffelds can acquire velocities along directions that deviate from that of the external force. This effect depends on characteristics of the particles, most notably particle size or particle index of refraction, and can therefore be (and has been) used to sort different particles. We introduce a simple model for particles subject to thermal uctuations and moving in appropriate potential landscapes. Numerical results are compared to recent experiments on landscapes produced with holographic optical tweezers and microfabricated technology. Our approach clariffes the relevance of different parameters, the direction and magnitude of the external force, particle size, and temperature.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria química::Química física
Àrees temàtiques de la UPC::Física
Colloids
Microfluidics
Nanotechnology
Research support
Surface Properties
Diffusion
Nonlinear systems
Nonlinear dynamics
Sorting
Transport on surfaces
Periodic potentials
Física
Sistemes no lineals
Artículo
American Physical Society
         

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