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dc.contributor.authorYaroshchuk, Andriy
dc.contributor.authorLuxbacher, Thomas
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2010-07-28T11:51:38Z
dc.date.available2010-07-28T11:51:38Z
dc.date.created2010-07-06
dc.date.issued2010-07-06
dc.identifier.citationYaroshchuk, A.; Luxbacher, T. Interpretation of electrokinetic measurements with porous films: role of electric conductance and streaming current within porous structure. "Langmuir", 06 Juliol 2010, vol. 26, núm. 13, p. 10882-10889.
dc.identifier.issn0743-7463
dc.identifier.urihttp://hdl.handle.net/2117/8445
dc.description.abstractIt is shown that in tangential electrokinetic measurements with porous films the porous structure makes contribution not only to the cell electric conductance (as demonstrated previously) but also to the observed streaming current. Both of these contributions give rise to dependences of streaming-potential and streaming-current coefficients on the channel height. However, due to the combined contribution of two phenomena, the dependence of streaming-potential coefficient on the channel height may be rather complicated and not allow for simple extrapolation. At the same time, the dependences of streaming-current coefficient and cell electric conductance on the channel height turn out linear and can be easily extrapolated to zero channel heights. This enables one to determine separately the contributions of external surface of porous film and of its porous structure to the streaming current and of the channel and porous structure to the cell electric conductance. This procedure is illustrated by the measurements of tangential electrokinetic phenomena and electric conductance with Millipore mixed-cellulose membrane filters of various average pore sizes (from 0.025 to 5 μm) in the so-called adjustable-gap cell of SurPASS electrokinetic instrument (Anton Paar GmbH). The design of this cell allows for easy and quasi-continuous variation of channel height as well as accurate determination of cell electric conductance, streaming-current coefficient, and channel height (from the cell hydraulic permeability). The quality of linear fits of experimental data has been found to be very good, and thus, the extrapolation procedures were quite reliable and accurate. Zeta-potentials could be determined of both external film and internal pore surfaces. It is demonstrated that the porous structures make considerable contributions to both streaming-current coefficient and cell electric conductance especially in the case of filters with larger pores. It is also found that, rather surprisingly, in filters with smaller pores the reduction in the filter electric conductivity turns out essentially stronger than could be expected proceeding from the filter porosity.
dc.format.extent8 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials
dc.subject.lcshPorous materials -- Electric properties
dc.titleInterpretation of electrokinetic measurements with porous films: role of electric conductance and streaming current within porous structure
dc.typeArticle
dc.subject.lemacMaterials porosos -- Propietats elèctriques
dc.identifier.doi10.1021/la100777z
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://pubs.acs.org/doi/abs/10.1021/la100777z
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac2604600
dc.description.versionPostprint (published version)
local.citation.authorYaroshchuk, A.; Luxbacher, T.
local.citation.publicationNameLangmuir
local.citation.volume26
local.citation.number13
local.citation.startingPage10882
local.citation.endingPage10889


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