Thermal properties of sodium-exchanged Palabora vermiculite

dc.contributor.authorMuiambo, Herminio Francisco
dc.contributor.authorFocke, Walter Wilhelm
dc.contributor.authorAtanasova, Maria Todorova
dc.contributor.authorVan der Westhuizen, Isbe
dc.contributor.authorTiedt, Louwrens R.
dc.contributor.emailwalter.focke@up.ac.zaen_US
dc.date.accessioned2011-02-18T09:10:58Z
dc.date.available2011-02-18T09:10:58Z
dc.date.issued2010-09
dc.description.abstractPalabora “vermiculite” represents an interstratified vermiculite-biotite containing less than 50% vermiculite. The sodium-exchanged form was prepared by immersion in saturated brine at ambient conditions. The sodium content reached the equilibrium level within the first month of exposure. However, XRD diffractograms continued to evolve and sharpen over a six-month period. The thermal-activated exfoliation was studied using thermo-mechanical analysis. The expansion of the neat “vermiculite” commenced at temperatures above 420 °C. Sodium exchange decreased the onset temperature by about 120 °C. The linear expansion reached a maximum of about eight-fold at temperatures around 700 °C and decreased again at higher temperatures.en_US
dc.description.sponsorshipFinancial support for this research from the Institutional Research Development Programme (IRDP) and the South Africa/Mozambique Collaboration Programme of the National Research Foundation (NRF) is gratefully acknowledged.en_US
dc.identifier.citationMuiambo, HF, Focke, WW, Atanasova, M, Van der Westhuizen, I & Tiedt, LR 2010, 'Thermal properties of sodium-exchanged Palabora vermiculite', Applied Clay Science, vol. 50, no. 1, pp. 51-57. [http://www.elsevier.com/locate/issn/01691317]en_US
dc.identifier.issn0169-1317
dc.identifier.other10.1016/j.clay.2010.06.023
dc.identifier.urihttp://hdl.handle.net/2263/15874
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rights© 2010 Elsevier B.V.en_US
dc.subjectVermiculiteen_US
dc.subjectIon exchangeen_US
dc.subjectMixed-layeren_US
dc.subjectInterstratificationen_US
dc.subjectExfoliationen_US
dc.subject.lcshSodium saltsen
dc.subject.lcshVermiculite -- Thermal propertiesen
dc.subject.lcshIon exchangeen
dc.titleThermal properties of sodium-exchanged Palabora vermiculiteen_US
dc.typePostprint Articleen_US

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