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An atomic force microscopy study of the interaction between magnetite particles: The effect of Ca2+ ions and pH
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0001-6877-9282
Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Beijing 100085, China.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0003-1646-569X
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Industriell miljö- och processteknik.ORCID-id: 0000-0001-9794-8305
Vise andre og tillknytning
2013 (engelsk)Inngår i: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 233, s. 116-122Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2013. Vol. 233, s. 116-122
HSV kategori
Forskningsprogram
Experimentell fysik; Gränsytors kemi; Tillämpad fysik
Identifikatorer
URN: urn:nbn:se:ltu:diva-13181DOI: 10.1016/j.powtec.2012.09.003ISI: 000311134200014Scopus ID: 2-s2.0-84867798457Lokal ID: c5e89ce0-75e4-467d-9005-64a33b60e9a9OAI: oai:DiVA.org:ltu-13181DiVA, id: diva2:986133
Merknad

Validerad; 2013; 20120914 (ysko)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2023-09-11bibliografisk kontrollert

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Dobryden, IlliaYang, XiaofangAlmqvist, NilsHolmgren, AllanWeber, Hans

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