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Open AccessArticle

Bubble Rise Velocity and Surface Mobility in Aqueous Solutions of Sodium Dodecyl Sulphate and n-Propanol

1
Department of Chemical Engineering, University of Chemistry and Technology, Prague, 166 28 Prague, Czech Republic
2
Institute of Chemical Process Fundamentals of the CAS, 165 02 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(12), 743; https://doi.org/10.3390/min9120743
Received: 30 October 2019 / Revised: 25 November 2019 / Accepted: 28 November 2019 / Published: 29 November 2019
(This article belongs to the Special Issue Surfactants at Interfaces and Thin Liquid Films)
Aqueous solutions of simple alcohols exhibit many anomalies, one of which is a change in the mobility of the bubble surface. This work aimed to determine the effect of the presence of another surface-active agent on bubble rise velocity and bubble surface mobility. The motion of the spherical bubble in an aqueous solution of n-propanol and sodium dodecyl sulphate (SDS) was monitored by a high-speed camera. At low alcohol concentrations (xP < 0.01), both the propanol and SDS molecules behaved as surfactants, the surface tension decreased and the bubble surface was immobile. The effect of the SDS diminished with increasing alcohol concentrations. In solutions with a high propanol content (xP > 0.1), the SDS molecules did not adsorb to the phase interface and thus, the surface tension of the solution was not reduced with the addition of SDS. Due to the rapid desorption of propanol molecules from the bottom of the bubble, a surface tension gradient was not formed. The drag coefficient can be calculated using formulas for the mobile surface of a spherical bubble.
Keywords: bubble velocity; bubble surface mobility; surfactant; propanol–water–SDS system bubble velocity; bubble surface mobility; surfactant; propanol–water–SDS system
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MDPI and ACS Style

Basařová, P.; Kryvel, Y.; Crha, J. Bubble Rise Velocity and Surface Mobility in Aqueous Solutions of Sodium Dodecyl Sulphate and n-Propanol. Minerals 2019, 9, 743.

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