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Title: Hydrodynamic interactions in narrow channels
Author: Misiunas, Karolis
ISNI:       0000 0004 7651 7348
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2017
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Particle-particle interactions are of paramount importance in every multi-body system as they determine the collective behaviour and coupling strength. Many well-known interactions like electro-static, van der Waals or screened Coulomb, decay exponentially or with negative powers of the particle spacing r. Similarly, hydrodynamic interactions between particles undergoing Brownian motion decay as 1/r in bulk, and are assumed to decay in small channels. Such interactions are ubiquitous in biological and technological systems. Here I confine multiple particles undergoing Brownian motion in narrow, microfluidic channels and study their coupling through hydrodynamic interactions. Our experiments show that the hydrodynamic particle-particle interactions are distance-independent in these channels. We also show that these interactions affect actively propelled particles via electrophoresis or gravity, resulting in non-linear transport phenomena. These findings are of fundamental importance for understanding transport of dense mixtures of particles or molecules through finite length, water-filled channels or pore networks.
Supervisor: Keyser, Ulrich F. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
Keywords: hydrodynamics ; nanofluidics ; microfluidics ; interactions ; long-range ; Brownian motion ; diffusion ; nano-channel ; pore ; transport ; drug delivery