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dc.contributor.author
Lopez-Garcia, J.J.
dc.contributor.author
Grosse, Constantino
dc.contributor.author
Horno, J.
dc.date.available
2020-04-03T21:30:21Z
dc.date.issued
2005-12
dc.identifier.citation
Lopez-Garcia, J.J.; Grosse, Constantino; Horno, J.; On the Use of the Hypothesis of Local Electroneutrality in Colloidal Suspensions for the
Calculation of Their Dielectric Properties; American Chemical Society; Journal of Physical Chemistry B; 109; 12-2005; 5808-5815
dc.identifier.issn
1089-5647
dc.identifier.uri
http://hdl.handle.net/11336/101985
dc.description.abstract
The validity of the hypothesis of electroneutrality outside the double layer of a suspended particle with an applied AC electric field is analyzed. It is shown that the electrolyte solution remains electroneutral for distances greater than a few Debye lengths from the particle surface only when the diffusion coefficients of the two ion species are identical. On the contrary, in the general case, a volume charge density around the particle builds up, which extends to distances that are proportional to the square root of the effective diffusion coefficient value divided by the frequency. These distances can easily attain many particle radii. Numerical results for both uncharged and charged suspended particles are presented, and a correction to existing analytical expressions for the field-induced ion distributions around uncharged particles (Grosse, C., López-García, J.J., Horno, J., J. Phys. Chem., 108, (2004), 8397) is given. While the charge densities far from the particle are usually very weak, it is shown that they strongly contribute to the dipole coefficient value and, therefore, to the calculated values of the permittivity and conductivity increments. The errors that would be committed if these charge densities were ignored, assuming local electroneutrality and determining the dipole coefficient at a few Debye lengths from the particle surface, are analyzed and shown to be substantial.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Chemical Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject.classification
Otras Ciencias Físicas
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
On the Use of the Hypothesis of Local Electroneutrality in Colloidal Suspensions for the
Calculation of Their Dielectric Properties
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-03-30T14:40:20Z
dc.journal.volume
109
dc.journal.pagination
5808-5815
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington DC
dc.description.fil
Fil: Lopez-Garcia, J.J.. Universidad de Jaén; España
dc.description.fil
Fil: Grosse, Constantino. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina
dc.description.fil
Fil: Horno, J.. Universidad de Jaén; España
dc.journal.title
Journal of Physical Chemistry B
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1021/jp044585l
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/jp044585l
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