Accession Number:

AD0653458

Title:

THE INFLUENCE OF SURFACE-ACTIVE MATERIAL ON THE PROPERTIES OF AIR BUBBLES AT THE AIR/SEA INTERFACE,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

• Garrett,W. D.

Report Date:

1967-05-08

Pagination or Media Count:

19.0

Abstract:

The lifetimes of single air bubbles were measured at water surfaces covered by various monomolecular films. Simultaneous measurements of bubble lifetime vs molecular area and film pressure vs area were made using air bubbles of various diameters. As the film pressure increased, the bubble lifetime passed through a maximum at about 1 dynecm and decreased at higher pressure with closer molecular packing. Mechanisms to account for this effect were based on surface tension gradient flow and dilational viscous forces within the film. The bubble stability data were used to describe molecular interactions and orientations within the stabilizing monolayer. The lifetimes of bubbles at an airsea interface were shown to be dependent upon the concentration of organic material in the water and the surface-chemical condition of the sea surface. The presence of a coherent surface film substantially reduced bubble stability, especially at elevated film pressures. Author

Descriptors:

• *SEA WATER
• *FOAM
• *SURFACE ACTIVE SUBSTANCES
• *BUBBLES
• MONOMOLECULAR FILMS
• INTERFACES
• AIR
• SURFACE TENSION
• MOLECULAR ASSOCIATION
• ORGANIC MATERIALS
• FATTY ACIDS
• FATTY ACID ESTERS
• GLYCOLS

Subject Categories:

• Physical and Dynamic Oceanography
• Solvents, Cleaners and Abrasives
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE