|
Home |
| Browse | |
|
|
Communities & Collections |
|
|
Issue Date |
|
|
Author |
|
|
Title |
|
|
Subject |
| Sign on to: | |
|
|
Receive email updates |
|
|
My APO authorized users |
|
|
Edit Profile |
|
|
|
|
|
About DSpace |
ANSTO Publications Online >
Conference Publications >
Conference Publications >
Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/3168
|
| Title: | Characterisation of metakaolin-based geopolymers using beam-based and conventional PALS. |
| Authors: | Guagliardo, P Roberts, J Vance, ER Weed, R Sergeant, AD Howie, A Wilkie, P Went, M Sullivan, J Williams, J Samarin, S Buckman, S |
| Keywords: | Positrons Annihilation Particle Beams Inorganic Polymers Heat Treatments Porosity |
| Issue Date: | 1-Aug-2010 |
| Publisher: | Institute of Physics |
| Citation: | Guagliardo, P., Roberts, J., Vance, E. R., Weed, R., Sergeant, A. D., Howie, A., et. al. (2010). Characterisation of metakaolin-based geopolymers using beam-based and conventional PALS. 12th International Workshop on Slow Positron Beam Techniques for Solids, Surfaces, Atoms and Molecules (SLOPOS12), 1st - 6th August 2010. All Seasons Resort: Magnetic Island, North Queensland, Australia. In Journal of Physics: Conference Series, 262(1), 012023. |
| Abstract: | The nano-porosity of metakaolin-based geopolymers and the effect of heat-treatment on porosity have been studied with conventional and beam-based positron annihilation lifetime spectroscopy (PALS). Conventional PALS found significant nano-porosity in the geopolymers, as indicated by the presence in the PALS spectrum of two long lifetime components, τ3 = 1.58 ns and τ4 = 47 ns, associated with pore diameters of approximately 0.5 and 3 nm respectively. The lifetime of the shorter component was found to decrease monotonically with successive heat treatments of 300°C and 600°C. Beam-based PALS, conducted at 5 keV, also indicated two long lifetime components, τ3 = 4.84 ns and τ4 = 54.6 ns. These are significantly longer than those observed by conventional PALS and the monotonic decrease of τ3 with successive heat treatments was not observed. As the beam-based PALS probed only the near-surface region, with an average implantation depth of about 350 nm, these results suggest that the near-surface structure may vary significantly from that of the bulk. This could be an inherent property of the samples or an artefact caused by surface effects or sample outgassing. |
| URI: | http://dx.doi.org/10.1088/1742-6596/262/1/012023 http://apo.ansto.gov.au/dspace/handle/10238/3168 |
| ISSN: | 1742-6588 |
| Appears in Collections: | Conference Publications |
Files in This Item: There are no files associated with this item. |
Items in APO are protected by copyright, with all rights reserved, unless otherwise indicated.
|
DSpace Software Copyright © 2002-2010 Duraspace - Feedback |