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

0521018 - ÚCHP 2020 RIV CH eng J - Journal Article
Basařová, P. - Kryvel, Y. - Crha, Jakub
Bubble Rise Velocity and Surface Mobility in Aqueous Solutions of Sodium Dodecyl Sulphate and n-Propanol.
Minerals. Roč. 9, č. 12 (2019), č. článku 743. E-ISSN 2075-163X
R&D Projects: GA ČR(CZ) GA19-09518S
Institutional support: RVO:67985858
Keywords : bubble velocity * bubble surface mobility * surfactant
OECD category: Chemical engineering (plants, products)
Impact factor: 2.380, year: 2019
Method of publishing: Open access
https://www.mdpi.com/2075-163X/9/12/743

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 (x(P) < 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 (x(P) > 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.
Permanent Link: http://hdl.handle.net/11104/0305743