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The surface potential explains ion specific bubble coalescence inhibition.

Abstract：

HYPOTHESIS:Some ions can prevent bubbles from coalescing in water. The Gibbs-Marangoni pressure has been proposed as an explanation of this phenomenon. This repulsive pressure occurs during thin film drainage whenever surface enhanced or surface depleted solutes are present. However, bubble coalescence inhibition is known to depend on which particular combination of ions are present in a peculiar and unexplained way. This dependence can be explained by the electrostatic surface potential created by the distribution of ions at the interface, which will alter the natural surface propensity of the ions and hence the Gibbs-Marangoni pressure. CALCULATIONS:A generalised form of the Gibbs-Marangoni pressure is derived for a mixture of solutes and the modified Poisson-Boltzmann equation is used to calculate this pressure for five different electrolyte solutions made up of four different ions. FINDINGS:Combining ions with differing surface propensities, i.e., one enhanced and one depleted, creates a significant electrostatic surface potential which dampens the natural surface propensity of these ions, resulting in a reduced Gibbs-Marangoni pressure, which allows bubble coalescence. This mechanism explains why the ability of electrolytes to inhibit bubble coalescence is correlated with surface tension for pure electrolytes but not for mixed electrolytes.

journal_name

J Colloid Interface Sci

journal_title

Journal of colloid and interface science

authors

Duignan TT

doi

10.1016/j.jcis.2021.04.144

keywords:

["Air–water interface","Electrolyte solution","Gibbs-Marangoni stress","Poisson–Boltzmann equation","Surface forces","Surface pressure"]

subject

Has Abstract

pub_date

2021-10-15 00:00:00

pages

338-343

eissn

0021-9797

issn

1095-7103

pii

S0021-9797(21)00669-X

journal_volume

600

pub_type

杂志文章

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