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VOLUME 87, NUMBER 17 P H Y S I C A L R E V I E W L E T T E R S 22 OCTOBER 2001 Images of Nanobubbles on Hydrophobic Surfaces and Their Interactions
 

Summary: VOLUME 87, NUMBER 17 P H Y S I C A L R E V I E W L E T T E R S 22 OCTOBER 2001
Images of Nanobubbles on Hydrophobic Surfaces and Their Interactions
James W. G. Tyrrell and Phil Attard
Ian Wark Research Institute, University of South Australia, Mawson Lakes SA 5095 Australia
(Received 17 July 2001; published 8 October 2001)
Imaging of hydrophobic surfaces in water with tapping mode atomic force microscopy reveals them
to be covered with soft domains, apparently nanobubbles, that are close packed and irregular in cross
section, have a radius of curvature of the order of 100 nm, and a height above the substrate of 2030 nm.
Complementary force measurements show features seen in previous measurements of the long-range
hydrophobic attraction, including a jump into a soft contact and a prejump repulsion. The distance of
the jump is correlated with the height of the images. The morphology of the nanobubbles and the time
scale for their formation suggest the origin of their stability.
DOI: 10.1103/PhysRevLett.87.176104 PACS numbers: 68.15.+e, 68.37.Ps
The long-ranged (10100 nm) attraction measured be-
tween macroscopic hydrophobic surfaces (see Ref. [1] and
references therein) has stimulated wide-ranging debate on
the origins and implications of the phenomenon. One pro-
posal, that the attraction is due to preexisting bubbles that
bridge the two approaching hydrophobic surfaces [1,2], is
gaining increasing acceptance. The idea is supported by

  

Source: Attard, Phil - School of Chemistry, University of Sydney

 

Collections: Chemistry