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2009 Seminars
Sponsored by the Global Climate and Energy Project (GCEP) and the Precourt Institute for Energy (PIE)
Sponsored by the Global Climate and Energy Project (GCEP) and the Woods Institute for the Environment featured:
GCEP Visiting Scholar - Professor Enge Wang Sponsored by the Global Climate and Energy Project (GCEP) and the Stanford Institute for Materials and Energy Science (SIMES) featured:  GCEP Visiting Scholar - Professor Enge Wang January 30, 2009 Host: Prof. Sally Benson, Director, GCEP, Stanford University > Slides (4.6MB, pdf) > More about Professor Enge Wang and GCEP's Sabbatical Program Professor Enge Wang Institute of Physics, Chinese Academy of Sciences, Beijing Understanding the nature of O-H bonds as the key issue in the study of water and energy: A molecular picture of water structure and dynamics from computer simulation Computer simulations are used to study the unusual structure and dynamics of water at molecular scale. Based on ab initio density functional theory, we have calculated prototype water structures including monomers, clusters, one-dimensional chains, and overlayers on metal (Pt, Ru, Rh, Pd, and Au) surfaces [1]. The structure, energetics, and vibrational spectra, are all obtained and compared with available experiments. A general model has been developed regarding the water-surface interaction and the interwater hydrogen bonding, which gives the right wetting order of these metal surfaces. This study is further extended to silica surface, where a two-dimensional tessellation ice is observed [2]. The new configuration is stable up to room temperature, because all the water molecules are fully saturated with H bonds either to each other or to the surface hydroxyl groups. Furthermore, the solvation and dissolution dynamics of a NaCl nanocrystal in water as well as the early stage of NaCl nucleation in supersaturated solution have been studied by molecular dynamics simulation [3]. Finally, if time allows, I will discuss surface energy and surface proton order of ice Ih [4]. Our results will show you that ice surface is unexpectedly cold. Short Bio: Prof. Enge Wang, Co-Director of Beijing National Laboratory for Condensed Matter Physics, was selected as the first GCEP Visiting Scholar. Prof. Wang’s current research focuses on surface physics in which he uses a combination of atomistic simulation and experimental techniques to study nonequilibrium growth, chemical vapor deposition of light-element nanomaterials, and water behavior in confined systems. More information on Professor Enge Wang |
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