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Hydrodynamic interactions in narrow channels 10.17863/CAM.33601 Misiunas, Karolis 0000000222366244 Keyser, Ulrich F. 0000000331885414 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. University of Cambridge 2017-02-25 Thesis Doctoral Doctor of Philosophy (PhD) en https://www.repository.cam.ac.uk/handle/1810/286289 https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/db003e7c-4191-46b9-a22c-94c45e883385/download de26d8a21d138c70c1c1dfef5e6fd66f https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/393c600c-2d1c-4634-a759-9f2091d7fdca/download 87eda9de84448d1f82354d60eee3eb5f https://creativecommons.org/licenses/by-sa/4.0/ hydrodynamics nanofluidics microfluidics interactions long-range Brownian motion diffusion nano-channel pore transport drug delivery