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.
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 pr...
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| Format: | Journal Article |
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Diffusion Fundamentals
2009
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| Online Access: | http://www.uni-leipzig.de/diffusion/pdf/volume10/diff_fund_10(2009)3.pdf http://hdl.handle.net/20.500.11937/40839 |
| _version_ | 1848755978985537536 |
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| author | Webber, J.B. Bland, Phil Strange, J. Anderson, R. Tohidi, B. |
| author_facet | Webber, J.B. Bland, Phil Strange, J. Anderson, R. Tohidi, B. |
| author_sort | Webber, J.B. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T09:04:54Z |
| format | Journal Article |
| id | curtin-20.500.11937-40839 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:04:54Z |
| publishDate | 2009 |
| publisher | Diffusion Fundamentals |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-408392017-01-30T14:46:01Z 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. Webber, J.B. Bland, Phil Strange, J. Anderson, R. Tohidi, B. cryoporometry plastic ice meteorite porosity confined geometry 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. 2009 Journal Article http://hdl.handle.net/20.500.11937/40839 http://www.uni-leipzig.de/diffusion/pdf/volume10/diff_fund_10(2009)3.pdf Diffusion Fundamentals fulltext |
| spellingShingle | cryoporometry plastic ice meteorite porosity confined geometry Webber, J.B. Bland, Phil Strange, J. Anderson, R. Tohidi, B. 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. |
| title | 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. |
| title_full | 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. |
| title_fullStr | 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. |
| title_full_unstemmed | 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. |
| title_short | 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. |
| title_sort | 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. |
| topic | cryoporometry plastic ice meteorite porosity confined geometry |
| url | http://www.uni-leipzig.de/diffusion/pdf/volume10/diff_fund_10(2009)3.pdf http://hdl.handle.net/20.500.11937/40839 |