Slowing-down of non-equilibrium concentration fluctuations in confinement Cédric Giraudet, Henri Bataller, Yifei Sun, Aleksandar Donev, José María Ortiz de Zárate and Fabrizio Croccolo EPL, 111 6 (2015) 60013 Published online: 12 October 2015 DOI: 10.1209/0295-5075/111/60013