Selective Coalescence of Bubbles in simple Electrolytes
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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.author | Marcelja, Stjepan | |
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dc.date.accessioned | 2015-12-13T23:03:43Z | |
dc.identifier.issn | 1520-6106 | |
dc.identifier.uri | http://hdl.handle.net/1885/85056 | |
dc.description.abstract | 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 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.publisher | American Chemical Society | |
dc.source | Journal of Physical Chemistry B | |
dc.subject | Keywords: Coalescence; Electrolytes; Hydrophobicity; Interfaces (materials); Ionic conduction; Van der Waals forces; Bubble coalescence; Hydrophobic attraction; Ion accumulation; Surface-surface interaction; Bubbles (in fluids) | |
dc.title | Selective Coalescence of Bubbles in simple Electrolytes | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.description.refereed | Yes | |
local.identifier.citationvolume | 110 | |
dc.date.issued | 2006 | |
local.identifier.absfor | 030505 - Physical Organic Chemistry | |
local.identifier.ariespublication | MigratedxPub13256 | |
local.type.status | Published Version | |
local.contributor.affiliation | Marcelja, Stjepan, College of Physical and Mathematical Sciences, ANU | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.startpage | 13062 | |
local.bibliographicCitation.lastpage | 13067 | |
local.identifier.doi | 10.1021/jp0610158 | |
dc.date.updated | 2015-12-12T07:50:54Z | |
local.identifier.scopusID | 2-s2.0-33746331690 | |
Collections | ANU Research Publications |
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