COLL 221 |
| Understanding the properties of water is crucial in a vast variety of chemical, physical and biological systems. In particular, adsorption of water on surfaces is a key area of interest in the fields of biophysics, electrochemistry, semiconductors and catalysis. Low-temperature scanning tunneling microscopy (LT-STM) allows us to image the preferred adsorption sites of water on Au(111). Au(111) was chosen as an inert metal with a variety of nucleation sites. We report the structure of water at 7 Kelvin, from single molecules to small ice crystals. STM spectroscopy performed on both the bare Au surface and on ice crystals reveals how the metal's electronic structure (dI/dV) changes as water is absorbed, and which vibrational excitations are present in the ice overlayer (d2I/dV2). We also report the manipulation of individual water molecules and intact ice clusters with the STM tip. |
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Fundamental Research in Colloid and Surface Chemistry
6:00 PM-8:00 PM, Monday, August 20, 2007 BCEC -- East Registration, Poster
Division of Colloid & Surface Chemistry |