Non-equilibrium concentration fluctuations in superparamagnetic nanocolloids Ana Oprisan, Ashley Rice, Sorinel A. Oprisan, Cédric Giraudet and Fabrizio Croccolo Eur. Phys. J. E, 40 2 (2017) 14 Published online: 10 February 2017 DOI: 10.1140/epje/i2017-11503-y