Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Forces Measured Between Hydrophobic Surfaces due to a Submicroscopic Bridging Archie Carambassis, Louisa C. Jonker, Phil Attard \Lambda , and Mark W. Rutland y
 

Summary: Forces Measured Between Hydrophobic Surfaces due to a Sub­microscopic Bridging
Bubble
Archie Carambassis, Louisa C. Jonker, Phil Attard \Lambda , and Mark W. Rutland y
School of Chemistry F11, University of Sydney, NSW, 2006, Australia.
(Submitted to Phys. Rev. Lett., May 4, 1998.)
Atomic force microscopy on hydrophobic microspheres in
water reveals a strong attraction with a range of 20--200 nm,
following an initial steep repulsion at long range. The data are
consistent with a single sub­microscopic bubble between the
surfaces, with the attraction due to its attachment and lateral
spread, and the repulsion dependent on film drainage and the
electric double layer. The results provide direct experimental
evidence of the existence of long­lived sub­micron bubbles,
and of their bridging as the cause of the measured long­range
attractions between macroscopic hydrophobic surfaces.
In the early seventies Blake and Kitchener [1] mea­
sured the rupture of the water film between a hydropho­
bic surface and an approaching bubble, and concluded
that a long­ranged attraction existed. The force between
two macroscopic hydrophobic surfaces has since been di­

  

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

 

Collections: Chemistry