  Effect of confinement on the liquid-liquid transition of water are studied by
simulations in the Gibbs ensemble. Upon cooling along the liquid-vapor
coexistence curve, confined water undergoes transition from normal to strongly
tetrahedral water via a first order phase transition (as in the bulk) or in a
continuous way in dependence on pore hydrophilicity. In all cases, transition
temperature is only slightly shifted by the confinement. This agrees with the
experimentally observed weak effect of confinement on the temperature of the
fragile-to-strong transition of water.
