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Surface Forces between Nanomagnetite and Silica in Aqueous Ca2+ Solutions Studied with AFM Colloidal Probe Method
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-6877-9282
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0001-6710-1066
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0001-9794-8305
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-1646-569X
2020 (English)In: Colloids and Interfaces, ISSN 2504-5377, Vol. 4, no 3, article id 41Article in journal (Refereed) Published
Abstract [en]

Dispersion and aggregation of nanomagnetite (Fe3O4) and silica (SiO2) particles are of high importance in various applications, such as biomedicine, nanoelectronics, drug delivery, flotation, and pelletization of iron ore. In directly probing nanomagnetite–silica interaction, atomic force microscopy (AFM) using the colloidal probe technique has proven to be a suitable tool. In this work, the interaction between nanomagnetite and silica particles was measured with AFM in aqueous Ca2+ solution at different pH levels. This study showed that the qualitative changes of the interaction forces with pH and Ca2+ concentrations were consistent with the results from zeta-potential measurements. The repulsion between nanomagnetite and silica was observed at alkaline pH and 1 mM Ca2+ concentration, but no repulsive forces were observed at 3 mM Ca2+ concentration. The interaction forces on approach were due to van der Waals and electrical double-layer forces. The good fitting of experimental data to the DLVO model and simulations supported this conclusion. However, contributions from non-DLVO forces should also be considered. It was shown that an increase of Ca2+ concentration from 1 to 3.3 mM led to a less pronounced decrease of adhesion force with increasing pH. A comparison of measured and calculated adhesion forces with a few contact mechanics models demonstrated an important impact of nanomagnetite layer nanoroughness.

Place, publisher, year, edition, pages
MDPI, 2020. Vol. 4, no 3, article id 41
Keywords [en]
AFM, nanomagnetite, silica, calcium ions, surface forces
National Category
Chemical Process Engineering Other Physics Topics
Research subject
Chemical Technology; Experimental Physics
Identifiers
URN: urn:nbn:se:ltu:diva-81264DOI: 10.3390/colloids4030041ISI: 000578138600001Scopus ID: 2-s2.0-85104198153OAI: oai:DiVA.org:ltu-81264DiVA, id: diva2:1484477
Note

Validerad;2020;Nivå 2;2020-10-29 (alebob)

Available from: 2020-10-29 Created: 2020-10-29 Last updated: 2023-09-05Bibliographically approved

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Dobryden, IlliaMensi, ElizavetaHolmgren, AllanAlmqvist, Nils

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