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Bare and Effective Charge of Mesoporous Silica Particles
Malmö högskola, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö högskola, Biofilms Research Center for Biointerfaces. Nanologica AB , SE-151 36 Södertälje, Sweden.ORCID iD: 0000-0002-2535-7108
Nanologica AB , SE-151 36 Södertälje, Sweden; Surface and Corrosion Science, KTH Royal Institute of Technology , SE-100 44 Stockholm, Sweden.
Theoretical Chemsitry, Department of Chemistry, Lund University , P.O. Box 124, SE-221 00 Lund, Sweden.
2017 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 33, p. 7343-7351Article in journal (Refereed)
Abstract [en]

We develop and combine a novel numerical model, within the Poisson−Boltzmann framework, with classical experimental titration techniques for mesoporous silica particles to study the charging behavior as both pH and the amount of monovalent salt are varied. One key finding is that these particles can be considered to have an effectively or apparent electroneutral inner core with an effectively charged rim. As a consequence, the total apparent charge of the particle is several orders of magnitude smaller than that of the bare silica charge, which accounts only for the charged silanol groups of the mesoporous silica particles and which has its major contribution from the interior. Hence, the interior dictates the mesoporous silicas’ bare charge while the rim its effective charge. We furthermore report density, charge, and accumulated charge profiles across the particle’s interface.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 33, p. 7343-7351
National Category
Natural Sciences
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URN: urn:nbn:se:mau:diva-4290DOI: 10.1021/acs.langmuir.7b01135ISI: 000406573400016PubMedID: 28635290Scopus ID: 2-s2.0-85025841212Local ID: 24197OAI: oai:DiVA.org:mau-4290DiVA, id: diva2:1401120
Available from: 2020-02-28 Created: 2020-02-28 Last updated: 2024-06-18Bibliographically approved

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Valetti, Sabrina

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