Non-decaying hydrodynamic interactions along narrow channels
Physical Review Letters
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Misiunas, K., Pagliara, S., Lauga, E. L., Lister, J., & Keyser, U. (2015). Non-decaying hydrodynamic interactions along narrow channels. Physical Review Letters, 115 (038301)https://doi.org/10.1103/PhysRevLett.115.038301
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 electrostatic, 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 we confine two 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. This finding is of fundamental importance for the interpretation of experiments where dense mixtures of particles or molecules diffuuse through finite length, water-filled channels or pore networks.
U.F.K. was supported by an ERC starting grant (PassMembrane 261101). S.P. acknowledges funding from a Leverhulme Early Career Fellowship. K.M. was supported by a grant from the EPSRC. E.L. was supported by Marie Curie CIG grant from EU.
European Research Council (261101)
External DOI: https://doi.org/10.1103/PhysRevLett.115.038301
This record's URL: https://www.repository.cam.ac.uk/handle/1810/248550