EFFECT OF AN INSOLUBLE SURFACTANT ON CAPILLARY OSCILLATIONS OF BUBBLES IN WATER - OBSERVATION OF A MAXIMUM IN THE DAMPING

被引:38
作者
ASAKI, TJ [1 ]
THIESSEN, DB [1 ]
MARSTON, PL [1 ]
机构
[1] WASHINGTON STATE UNIV,DEPT PHYS,PULLMAN,WA 99164
关键词
D O I
10.1103/PhysRevLett.75.2686
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The excess damping of capillary waves caused by a surfactant monolayer is demonstrated to be present as well for the quadrupole shape mode of an isolated acoustically trapped bubble in water. To facilitate measurements of damping as a function of surface concentration, a method was developed for depositing a known amount of insoluble surfactant (stearic acid) on the surface of the bubble. As the bubble dissolves, the stearic acid concentration increases, and the excess damping has a pronounced local maximum near 0.26 nm(2) per molecule specific area in agreement with capillary wave data for a flat surface. The method of depositing insoluble surfactant should be applicable to the characterization of other surface-limited processes in isolated bubbles.
引用
收藏
页码:2686 / 2689
页数:4
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