Skip navigation
Skip navigation

Selective Coalescence of Bubbles in simple Electrolytes

Marcelja, Stjepan

Description

Simple ions in electrolytes exhibit different degrees of affinity for the approach to the free surface of water. This results in strong ion-specific effects that are particularly dramatic in the selective inhibition of bubble coalescence. I present here the calculation of electrostatic interaction between free surfaces of electrolytes caused by the ion accumulation or depletion near a surface. When both anion and cation are attracted to the surface (like H+ and Cl- in HCl solutions), van der...[Show more]

dc.contributor.authorMarcelja, Stjepan
dc.date.accessioned2015-12-13T23:03:43Z
dc.identifier.issn1520-6106
dc.identifier.urihttp://hdl.handle.net/1885/85056
dc.description.abstractSimple ions in electrolytes exhibit different degrees of affinity for the approach to the free surface of water. This results in strong ion-specific effects that are particularly dramatic in the selective inhibition of bubble coalescence. I present here the calculation of electrostatic interaction between free surfaces of electrolytes caused by the ion accumulation or depletion near a surface. When both anion and cation are attracted to the surface (like H+ and Cl- in HCl solutions), van der Waals attraction facilitates approach of the surfaces and the coalescence of air bubbles. When only an anion or cation is attracted to the surface (like Cl - in NaCl solutions), an electric double layer forms, resulting in repulsive interaction between free surfaces. I applied the method of effective potentials (evaluated from published ion density profiles obtained in simulations) to calculate the ionic contribution to the surface-surface interaction in NaCl and HCl solutions. In NaCl, but not in HCl, the double-layer interaction creates a repulsive barrier to the approach of bubbles, in agreement with the experiments. Moreover, the concentration where ionic repulsion in NaCl becomes comparable in magnitude to the short-range hydrophobic attraction corresponds to the experimentally found transition region toward the inhibition of coalescence.
dc.publisherAmerican Chemical Society
dc.sourceJournal of Physical Chemistry B
dc.subjectKeywords: Coalescence; Electrolytes; Hydrophobicity; Interfaces (materials); Ionic conduction; Van der Waals forces; Bubble coalescence; Hydrophobic attraction; Ion accumulation; Surface-surface interaction; Bubbles (in fluids)
dc.titleSelective Coalescence of Bubbles in simple Electrolytes
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume110
dc.date.issued2006
local.identifier.absfor030505 - Physical Organic Chemistry
local.identifier.ariespublicationMigratedxPub13256
local.type.statusPublished Version
local.contributor.affiliationMarcelja, Stjepan, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage13062
local.bibliographicCitation.lastpage13067
local.identifier.doi10.1021/jp0610158
dc.date.updated2015-12-12T07:50:54Z
local.identifier.scopusID2-s2.0-33746331690
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Marcelja_Selective_Coalescence_of_2006.pdf173.9 kBAdobe PDF    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator