arXiv:1107.1926v1 [cond-mat.stat-mech] 11 Jul 2011 Effects of Topological Order in Confinement on Liquids with Anomalous Behavior Elena G. Strekalova, 1 Jiayuan Luo, 1 H. Eugene Stanley, 1 Sergey V. Buldyrev, 2 and Giancarlo Franzese 3 1 Center for Polymer Studies and Department of Physics, Boston University, Boston, Massachusetts 02215, USA 2 Department of Physics, Yeshiva University, 500 West 185th Street, New York, New York 10033, USA 3 Departament de Fisica Fonamental, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain (Dated: July 12, 2011) Abstract We investigate by molecular dynamics the effect of the topological order in nanoconfinement of liquids with water-like anomalies that display liquid-liquid coexistence at low pressure and low temperature. We find that regularly structured confinements preserve the anomalies, while the phase diagram is shifted to lower temperatures, higher pressures and higher densities with respect to bulk. On the contrary, if the confinement has no topological order, we find a drastically different phase diagram: the liquid-liquid coexistence region shrinks significantly and the anomalies are washed out. To understand this effect we calculate the changes in the system at the microscopic level. In the vicinity of the confining nanoparticles we observe that the liquid has a dramatic increase of density that we interpret as an entropic effect. We explain the macroscopic effect of confinement as a consequence of the amount of disorder that is introduced in the system through the confining nanoparticles configuration. PACS numbers: 64.70.Ja,65.20.-w, 66.10.C- 1