Artículos de revistas
Imaging Ice-like Structures Formed On Hopg At Room Temperature.
Registro en:
Langmuir : The Acs Journal Of Surfaces And Colloids. v. 26, n. 22, p. 16986-90, 2010-Nov.
1520-5827
10.1021/la103227j
20932040
Autor
Teschke, Omar
Institución
Resumen
In this work, ice was viewed at the nanoscale by scanning an atomic force microscopy tip over a highly oriented pyrolytic graphite (HOPG) surface in air. At low scan velocities, the tip exhibited stick-slip motion with a period of 0.13 nm corresponding to the scanner step; at higher velocities, the HOPG lattice and the periodicity of the ice were visible. A hexagonal structure with a 0.45 ± 0.04 nm periodicity was observed in which the distance between the second neighbors of the HOPG coincided with the distance of the first neighbors for the ice-like arrangement. Small water clusters were also nucleated with an ice-Ic structure (0.34 ± 0.03 nm), and thus, the ice layers consisted of extensive sets composed of arrangements of hexamers and tetramers. 26 16986-90