Effect of non-ionic surfactants on transient cavitation in a megasonic field

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Abstract

High resolution chronoamperometry has been used to characterize the effect of two non-ionic surfactants, Triton® X-100 and NCW®-1002, on cavitation in aqueous solutions exposed to ∼1 MHz sound field. Specifically, using ferricyanide as the electroactive species, temporal variation of current during its reduction on a 25 μm Pt microelectrode has been measured and is used to elucidate transient cavity behavior. The chronoamperograms for solutions exposed to megasonic field show current 'peaks' riding on the baseline current. These current 'peaks' have been attributed to the diffusion of ferricyanide species concentrated at the liquid-vapor interface of a transient cavity at the end of its collapse. In the presence of surfactants, the frequency of occurrence of current 'peaks' with magnitude ≥0.3 μA is found to increase indicating a higher number of transient cavity collapses. A simple mathematical model based on diffusion developed previously by the authors has been used to extract the maximum cavity size and range of distances between the center of the collapsing cavity and the electrode surface in the surfactant solutions.

Original languageEnglish (US)
Pages (from-to)603-609
Number of pages7
JournalUltrasonics Sonochemistry
Volume20
Issue number1
DOIs
StatePublished - Jan 2013

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Keywords

  • Acoustic streaming
  • Chronoamperometry
  • Megasonic cleaning
  • Surfactants
  • Transient cavitation

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Radiology Nuclear Medicine and imaging
  • Acoustics and Ultrasonics
  • Organic Chemistry
  • Inorganic Chemistry

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