Characterisation of metakaolin-based geopolymers using beam-based and conventional PALS

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dc.contributor.authorGuagliardo, Pen_AU
dc.contributor.authorRoberts, Jen_AU
dc.contributor.authorVance, ERen_AU
dc.contributor.authorWeed, Ren_AU
dc.contributor.authorSergeant, ADen_AU
dc.contributor.authorHowie, Aen_AU
dc.contributor.authorWilkie, Pen_AU
dc.contributor.authorWent, Men_AU
dc.contributor.authorSullivan, Jen_AU
dc.contributor.authorWilliams, Jen_AU
dc.contributor.authorSamarin, Sen_AU
dc.contributor.authorBuckman, SJen_AU
dc.date.accessioned2011-03-30T23:22:53Zen_AU
dc.date.available2011-03-30T23:22:53Zen_AU
dc.date.issued2010-08-01en_AU
dc.date.statistics2010-08-01en_AU
dc.description.abstractThe 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. © Copyright 2020 IOP Publishingen_AU
dc.description.sponsorshipARC Centre for Antimatter-Matter Studies; Australian National University (ANU); Flinders University; James Cook University (JCU); The Institute of Physics; Australian Government Department of Innovation, Industry, Science and Researchen_AU
dc.identifier.articlenumber12023en_AU
dc.identifier.citationGuagliardo, P., Roberts, J., Vance, E. R., Weed, R., Sergeant, A. D., Howie, A., Wilkie, P., Went, M., Sullivan, J., Williams, J., Samarin, S., Buckman, S. (2010). Characterisation of metakaolin-based geopolymers using beam-based and conventional PALS. Paper presented at the 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. doi:10.1088/1742-6596/262/1/012023en_AU
dc.identifier.conferenceenddate6 August 2010en_AU
dc.identifier.conferencename12th International Workshop on Slow Positron Beam Techniques for Solids, Surfaces, Atoms and Molecules (SLOPOS12)en_AU
dc.identifier.conferenceplaceMagnetic Island, North Queenslanden_AU
dc.identifier.conferencestartdate1 August 2010en_AU
dc.identifier.govdoc3336en_AU
dc.identifier.issn1742-6588en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleJournal of Physics: Conference Seriesen_AU
dc.identifier.urihttp://dx.doi.org/10.1088/1742-6596/262/1/012023en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3168en_AU
dc.identifier.volume262en_AU
dc.language.isoenen_AU
dc.publisherInstitute of Physicsen_AU
dc.subjectPositronsen_AU
dc.subjectAnnihilationen_AU
dc.subjectParticle beamsen_AU
dc.subjectInorganic polymersen_AU
dc.subjectHeat treatmentsen_AU
dc.subjectPorosityen_AU
dc.titleCharacterisation of metakaolin-based geopolymers using beam-based and conventional PALSen_AU
dc.typeConference Paperen_AU
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