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Experimental Data Contributing to the Elusive Surface Charge of Inert Materials in Contact with Aqueous Media
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2021 (English)In: Colloids and interfaces, E-ISSN 2504-5377, Vol. 5, no 1, article id 6Article in journal (Other academic) Published
Abstract [en]

We studied the charging of inert surfaces (polytetrafluoroethylene, i.e., PTFE; graphite; graphene; and hydrophobic silica) using classical colloid chemistry approaches. Potentiometric titrations showed that these surfaces acquired less charge from proton-related reactions than oxide minerals. The data from batch-type titrations for PTFE powder did not show an effect of ionic strength, which was also in contrast with results for classical colloids. In agreement with classical colloids, the electrokinetic results for inert surfaces showed the typical salt level dependence. In some cases, the point of zero net proton charge as determined from mass and tentatively from acid–base titration differed from isoelectric points, which has also been previously observed, for example by Chibowski and co-workers for ice electrolyte interfaces. Finally, we found no evidence for surface contaminations of our PTFE particles before and after immersion in aqueous solutions. Only in the presence of NaCl-containing solutions did cryo-XPS detect oxygen from water. We believe that our low isoelectric points for PTFE were not due to impurities. Moreover, the measured buffering at pH 3 could not be explained by sub-micromolar concentrations of contaminants. The most comprehensive explanation for the various sets of data is that hydroxide ion accumulation occurred at the interfaces between inert surfaces and aqueous solutions.

Place, publisher, year, edition, pages
MDPI, 2021. Vol. 5, no 1, article id 6
Keywords [en]
surface charge, zeta-potential, PTFE, graphite, graphene
National Category
Physical Chemistry Materials Chemistry Other Chemistry Topics Inorganic Chemistry Theoretical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-179388DOI: 10.3390/colloids5010006ISI: 000633103200001Scopus ID: 2-s2.0-85104877929OAI: oai:DiVA.org:umu-179388DiVA, id: diva2:1524232
Available from: 2021-02-01 Created: 2021-02-01 Last updated: 2023-09-05Bibliographically approved

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Shchukarev, Andrey

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CiteExportLink to record
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Citation style
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