University of Surrey

Test tubes in the lab Research in the ATI Dance Research

The effect of surface-active solutes on bubble coalescence in the presence of ultrasound

Lee, J, Kentish, SE and Ashokkurnar, M (2005) The effect of surface-active solutes on bubble coalescence in the presence of ultrasound Journal of Physical Chemistry B, 109 (11). pp. 5095-5099.

[img]
Preview
PDF (licence)
SRI_deposit_agreement.pdf
Available under License : See the attached licence file.

Download (33kB) | Preview

Abstract

The sonication of an aqueous solution generates cavitation bubbles, which may coalesce and produce larger bubbles. This paper examines the effect of surface-active solutes on such bubble coalescence in an ultrasonic field. A novel capillary system has been designed to measure the change in the total volume resulting from the sonication of aqueous solutions with 515 kHz ultrasound pulses. This volume change reflects the total volume of larger gas bubbles generated by the coalescence of cavitation bubbles during the sonication process. The total volume of bubbles generated is reduced when surface-active solutes are present. We have proposed that this decrease in the total bubble volume results from the inhibition of bubble coalescence brought about by the surface-active solutes. The observed results revealed similarities with bubble coalescence data reported in the literature in the absence of ultrasound. It was found that for uncharged and zwitterionic surface-active solutes, the extent of bubble coalescence is affected by the surface activity of the solutes. The addition of 0.1 M NaCl to such solutes had no effect on the extent of bubble coalescence. Conversely, for charged surface-active solutes, the extent of bubble coalescence appears to be dominated by electrostatic effects. The addition of 0.1 M NaCl to charged surfactant solutions was observed to increase the total bubble volume close to that of the zwitterionic surfactant. This suggests the involvement of electrostatic interactions between cavitation bubbles in the presence of charged surfactants in the solution.

Item Type: Article
Subjects : Chemical and Process Engineering
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
AuthorsEmailORCID
Lee, JUNSPECIFIEDUNSPECIFIED
Kentish, SEUNSPECIFIEDUNSPECIFIED
Ashokkurnar, MUNSPECIFIEDUNSPECIFIED
Date : 24 March 2005
Identification Number : 10.1021/jp0476444
Copyright Disclaimer : Copyright © 2005 American Chemical Society
Uncontrolled Keywords : Science & Technology, Physical Sciences, Chemistry, Physical, Chemistry, CHEMISTRY, PHYSICAL, SPHERICAL OSCILLATING BUBBLES, COLLIDING SMALL BUBBLES, AQUEOUS-SOLUTIONS, MULTIBUBBLE SONOLUMINESCENCE, MASS-TRANSFER, GAS-BUBBLES, SINGLE-BUBBLE, AIR BUBBLES, WATER, ELECTROLYTES
Related URLs :
Additional Information : Item not available from this repository
Depositing User : Symplectic Elements
Date Deposited : 05 Aug 2016 13:50
Last Modified : 05 Aug 2016 13:50
URI: http://epubs.surrey.ac.uk/id/eprint/809192

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800