Hydrodynamic interaction in quasi-two-dimensional suspensions
  Confinement between two parallel surfaces is found, theoretically and experimentally, to drastically affect the hydrodynamic interaction between colloid particles, changing the sign of the coupling, its decay with distance and its concentration dependence. In particular, we show that three-body effects do not modify the coupling at large distances as would be expected from hydrodynamic screening. 
H. Diamant, B. Cui, B. Lin, S. A. Rice