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DLVO interactions of tungsten oxide and cobalt oxide surfaces measured with the colloidal probe technique
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
2002 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 246, 309-315 p.Article in journal (Refereed)
Abstract [en]

We have investigated the DLVO surface forces of oxidised tungsten and cobalt surfaces using the atomic force microscope (AFM) colloidal probe technique. It was shown by X-ray Photoelectron Spectroscopy (XPS), and electrokinetic measurements that this model system is representative for industrial WC and Co powders used in the production of hard metals. We found that the attractive van der Waals forces are well described by Hamaker constants, calculated from optical data for WO3 and CoOOH. The repulsive electrostatic double layer forces between WO3 surfaces increase with increasing pH due to an increasingly negative surface potential. This surface potential decreases with increasing ionic strength at pH 7.5. The electrostatic interaction between WO3 and CoOOH is attractive at pH 10, suggesting a positively charged CoOOH surface.

Place, publisher, year, edition, pages
2002. Vol. 246, 309-315 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26689OAI: oai:DiVA.org:ri-26689DiVA: diva2:1053692
Note
A1475Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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