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dc.contributor.authorWebber, J.B.
dc.contributor.authorBland, Phil
dc.contributor.authorStrange, J.
dc.contributor.authorAnderson, R.
dc.contributor.authorTohidi, B.
dc.date.accessioned2017-01-30T14:46:00Z
dc.date.available2017-01-30T14:46:00Z
dc.date.created2014-09-09T20:01:03Z
dc.date.issued2009
dc.identifier.citationWebber, J.B. and Bland, P. and Strange, J. and Anderson, R. and Tohidi, B. 2009. Why you Can’t Use Water to Make Cryoporometric Measurements of the Pore Size Distributions in Meteorites – or in High Iron Content Clays, Rocks or Concrete. Diffusion Fundamentals. 10: pp. 1-3.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/40839
dc.description.abstract

Many porous materials have high susceptibility magnetic gradients in the pores, due to the presence of iron or other magnetic materials. Thus if probe liquids are placed in the pores they exhibit fast decaying signals with a short T2*. Usually the actual T2 of the liquids is also reduced, due the presence of paramagnetic ions in the pore walls. The usual solution in NMR is to measure an echo (or echo train) at short times. However, recent work [J. Phys.: Condens. Matter 19, 415117, 2007.] has shown that water/ice systems near a pore wall form rotator phase plastic ice, with T2 relaxation times in the region of 100 to 200 ms. Thus if a NMR cryoporometric measurement is attempted with a measurement time significantly less than 1 or 2 milli-seconds, the result is to make a measurement based on the phase properties of the brittle to plastic ice phase transition, not that of the brittle ice to water phase transition. This gives rise to artefacts of small pore sizes that may not actually be present. This work successfully uses a-polar liquids instead.

dc.publisherDiffusion Fundamentals
dc.relation.urihttp://www.uni-leipzig.de/diffusion/pdf/volume10/diff_fund_10(2009)3.pdf
dc.subjectcryoporometry
dc.subjectplastic ice
dc.subjectmeteorite
dc.subjectporosity
dc.subjectconfined geometry
dc.titleWhy you Can’t Use Water to Make Cryoporometric Measurements of the Pore Size Distributions in Meteorites – or in High Iron Content Clays, Rocks or Concrete.
dc.typeJournal Article
dcterms.source.volume10
dcterms.source.issn1862-4138
dcterms.source.titleDiffusion Fundamentals
curtin.note

Copyright © 2009 J. Beau Webber, Philip Bland, John Strange, Ross Anderson & Bahman Rohidi.

curtin.accessStatusOpen access


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