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An atomic force microscopy study of the interaction between magnetite particles: the effect of Ca2 + ions and pH
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-6877-9282
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-1646-569X
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0001-9794-8305
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2013 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 233, p. 116-122Article in journal (Refereed) Published
Abstract [en]

Force interactions between a microsize (m-s) magnetite probe and thin layers of synthesized magnetite particles as well as microsize (m-s) magnetite particles from magnetite concentrate were investigated using atomic force microscopy (AFM). Of special interest was the influence of Ca2 + ions and pH on the interaction between the probe and the two different magnetite particle surfaces. The probe and the magnetite surfaces were immersed in aqueous Ca2 + solutions (100, 10, and 1 mM) at various pH values (4, 6, and 10). The colloidal probe technique and a self-made computer program for automatic evaluation of adhesion forces were used. The analysis revealed an increase in adhesion force with increased calcium concentration at pH 6 for both the systems investigated. However, the adhesion behavior between the probe and the m-s and n-s magnetite particle surfaces is different at pH 10. The possible appearance of calcium carbonate precipitated onto the magnetite surfaces as well as the possible influence of already adsorbed silicate on magnetite particles from the concentrate is discussed. In addition to Ca, Cl and Na atoms, added to the working solutions, and the Fe and O detected signals, the SEM-EDS analysis also detected Si atoms on the surface of the m-s particles.

Place, publisher, year, edition, pages
2013. Vol. 233, p. 116-122
National Category
Other Physics Topics Physical Chemistry
Research subject
Experimental physics; Chemistry of Interfaces; Tillämpad fysik
Identifiers
URN: urn:nbn:se:ltu:diva-13181DOI: 10.1016/j.powtec.2012.09.003ISI: 000311134200014Scopus ID: 2-s2.0-84867798457Local ID: c5e89ce0-75e4-467d-9005-64a33b60e9a9OAI: oai:DiVA.org:ltu-13181DiVA, id: diva2:986133
Note
Validerad; 2013; 20120914 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Dobryden, IlliaYang, XiaofangAlmqvist, NilsHolmgren, AllanWeber, Hans

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