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Type: Artigo de periódico
Title: Imaging Ice-like Structures Formed On Hopg At Room Temperature.
Author: Teschke, Omar
Abstract: 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.
Subject: Air
Microscopy, Atomic Force
Models, Molecular
Molecular Conformation
Rights: fechado
Identifier DOI: 10.1021/la103227j
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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