Influence of solution pH and electrolyte presence on bubble velocity in anionic surfactant solutions.
M. Krzan 1  
,   K. Malysa 1
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Institute of Catalysis and Surface Chemistry
M. Krzan   

Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Krakow, Poland
Publication date: 2009-01-01
Physicochem. Probl. Miner. Process. 2009;43(1):43–58
Influence of sodium n-dodecyl sulfate (SDDS) concentration, presence of electrolytes (NaCl and KCl) and the solution pH variation on profiles of the bubble local velocity and values of the bubble terminal velocity were studied. It was found that in SDDS solutions the bubble accelerated rapidly af- ter the detachment and either a maximum was observed (low SDDS solution concentrations) followed by a period of monotonic decrease or the terminal velocity was attained immediately after the accel- eration stage (high SDDS concentrations). Addition of the electrolyte and/or the pH variation caused significant diminishing the local velocity in low concentrations solutions and lowering the bubble terminal velocity to a value characteristic for SDDS solutions of high concentrations. This effect of electrolyte and pH on the bubble velocity variations was attributed to lowering surface tension of the SDDS solutions.