dc.contributor.author |
Muiambo, Herminio Francisco
|
|
dc.contributor.author |
Focke, Walter Wilhelm
|
|
dc.contributor.author |
Atanasova, Maria Todorova
|
|
dc.contributor.author |
Van der Westhuizen, Isbe
|
|
dc.contributor.author |
Tiedt, Louwrens R.
|
|
dc.date.accessioned |
2011-02-18T09:10:58Z |
|
dc.date.available |
2011-02-18T09:10:58Z |
|
dc.date.issued |
2010-09 |
|
dc.description.abstract |
Palabora “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.sponsorship |
Financial 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.citation |
Muiambo, 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.issn |
0169-1317 |
|
dc.identifier.other |
10.1016/j.clay.2010.06.023 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/15874 |
|
dc.language.iso |
en |
en_US |
dc.publisher |
Elsevier |
en_US |
dc.rights |
© 2010 Elsevier B.V. |
en_US |
dc.subject |
Vermiculite |
en_US |
dc.subject |
Ion exchange |
en_US |
dc.subject |
Mixed-layer |
en_US |
dc.subject |
Interstratification |
en_US |
dc.subject |
Exfoliation |
en_US |
dc.subject.lcsh |
Sodium salts |
en |
dc.subject.lcsh |
Vermiculite -- Thermal properties |
en |
dc.subject.lcsh |
Ion exchange |
en |
dc.title |
Thermal properties of sodium-exchanged Palabora vermiculite |
en_US |
dc.type |
Postprint Article |
en_US |