| Wed July 6th 2016 16:00 – 16:30 ZH286 | Seminar | Room Temperature Ice Confined Between Two Dimensional Materials Pantelis Bampoulis |
Details:The structure and state of water confined between hydrophobic molybdenum disulfide (MoS2) and graphene (Gr) are experimentally investigated at room temperature by means of atomic force microscopy (AFM). We find the existence of two dimensional (2D) crystalline ice layers and three dimensional (3D) droplets. In contrast to the puckered hexagonal ice ‘bilayers’ of bulk ice, these 2D crystalline ice phase consists of two planar hexagonal layers. Further water condensation leads to either the lateral expansion of the ice layers or to the formation of 3D water droplets on top or at the edges of the two layer ice, indicating that water does not wet these planar ice films. The results presented here are in line with a recent theory suggesting that water confined between hydrophobic walls forms 2D crystalline two layer ice with a non-tetrahedral geometry and intrahydrogen bonding. The lack of dangling bonds on either surface of the ice film gives rise to a slight hydrophobic character. | ||
