Volume 81, Number 6, March 2008
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||28 February 2008|
Correlation between geometry and nanobubble distribution on HOPG surface
Physics of Fluids Group, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente - 7500 AE Enschede, The Netherlands
2 Solid State Physics Group, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente - 7500 AE Enschede, The Netherlands
Accepted: 30 January 2008
We show that the distribution of nanobubbles is inhomogeneous on the (under-water) surface of highly orientated pyrolytic graphite (HOPG), reflecting the atomic steps: The formation of nanobubbles is strongly enhanced at the upper side of the atomic steps, i.e., the most hydrophobic area on the surface. In contrast, no nanobubbles are formed at the lower side of the steps, i.e., the most hydrophilic area. The width of this nanobubble-free zone is approximately 20 nm. We thus establish a correlation between surface topography and nanobubble formation. In addition, we show that the profile of nanobubbles is sensitive to the applied AFM tip-force, demonstrating the deformability of nanobubbles.
PACS: 47.55.db – Drop and bubble formation / 68.08.-p – Liquid-solid interfaces / 68.37.Ps – Atomic force microscopy (AFM)
© EPLA, 2008
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