Clay particles - Potential of positron annihilation lifetime spectroscopy (PALS) for studying interlayer spacing

Fong, N., Guagliardo, P., Williams, J., Musumeci, A., Martin, D. and Smith, S. V. (2011). Clay particles - Potential of positron annihilation lifetime spectroscopy (PALS) for studying interlayer spacing. In: 12th International Workshop on Slow Positron Beam Techniques for Solids, Surfaces, Atoms and Molecules, SLOPOS12, Magnetic Island, QLD, Australia, (012022.1-012022.4). 1-6 August 2010. doi:10.1088/1742-6596/262/1/012022


Author Fong, N.
Guagliardo, P.
Williams, J.
Musumeci, A.
Martin, D.
Smith, S. V.
Title of paper Clay particles - Potential of positron annihilation lifetime spectroscopy (PALS) for studying interlayer spacing
Conference name 12th International Workshop on Slow Positron Beam Techniques for Solids, Surfaces, Atoms and Molecules, SLOPOS12
Conference location Magnetic Island, QLD, Australia
Conference dates 1-6 August 2010
Journal name Journal of Physics: Conference Series   Check publisher's open access policy
Place of Publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Publication Year 2011
Sub-type Fully published paper
DOI 10.1088/1742-6596/262/1/012022
Open Access Status DOI
ISSN 1742-6588
1742-6596
Volume 262
Issue 1
Start page 012022.1
End page 012022.4
Total pages 4
Abstract/Summary Characterisation of clays is generally achieved by traditional methods, such as X-ray diffraction (XRD) and transmission electron microscopy (TEM). However, clays are often difficult to characterise due to lack of long-range order, thus these tools are not always reliable. Because interlayer spacing in clays can be adjusted to house molecules, there is growing interest to use these materials for drug delivery. Positron annihilation lifetime spectroscopy (PALS) was examined as an alternative tool to characterise a series of well-known clays. XRD of two layered double hydroxides; MgAl-LDH and MgGd-LDH, natural hectorite, fluoromica and laponite, and their PALS spectra were compared. XRD data was used to calculate the interlayer d- spacing in these materials and results show a decrease in interlayer spacing as the heavy metal ions are substituted for those of large ionic radii. Similar results were obtained for PALS data. This preliminary study suggests PALS has potential as a routine tool for characterising clay particles. Further work will examine the sensitivity and reliability of PALS to percent of metal doping and hydration in clay microstructure.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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