Effects of dissolved gas on the hydrophobic attraction between surfactant-coated surfaces.
The effect of dissolved gas on the hydrophobic attraction between double-chained surfactant monolayers physisorbed on mica has been studied using a surface forces apparatus (SFA). Distance vs time data were obtained over the full distance regime from D approximately 1000 A down to contact using the dynamic SFA method. Removal of dissolved gas was seen to reduce the range of the attraction while the short-range attraction (under approximately 250 A) remained unchanged. The implications for the possibility of two distinct force regimes in the interactions between hydrophobic surfaces are discussed.
Meyer
Emily E
EE
Departments of Physics and Chemical Engineering, University of California at Santa Barbara, CA 93106, USA.
Lin
Qi
Q
Israelachvili
Jacob N
JN