Webber, J.B.W. and Strange, J.H. and Bland, P.A. and Anderson, R.A. and Tohidi, B. (2008) Dynamics at Surfaces : Probing the dynamics of polar and a-polar liquids at silica and vapour surfaces. In: 9th International Bologna Conference on Magnetic Resonance in Porous Media, July 13th - 17th 2008, Cambridge, MA, USA.
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Abstract
Recent studies by Nuclear Magnetic Resonance and Neutron Scattering of the dynamics and phase-fractions of water/ice systems in templated porous silicas (SBA-15) indicate that what was believed to be a non-frozen surface water layer is actually plastic ice, the quantity varying (continuously and reversibly) with temperature, and converting to a brittle (mainly cubic) ice at lower temperatures. Current research relates to the study the dynamics of polar water/ice and a-polar organics at both solid and vapour interfaces. The polar results are significant for water/ice systems in the environment, where snow-packs, glaciers and icebergs are common examples of water/ice systems with extensive air/vapour interfaces. This research also points the way forward for wide-range cryoporometric metrology in 'difficult' systems such as high iron content clays and rocks, as well as aged concrete. Results are presented for cryoporometric measurements on meteorite samples with a significant metallic content, exhibiting T2* relaxation times down to 2.5ms.
| Item Type: | Conference or workshop item (Paper) |
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| Uncontrolled keywords: | confined geometry; phase-change; Gibbs-Thomson; neutron scattering; neutron diffraction; plastic ice; NMR; NMR relaxation; cryoporometry; DSC; thermoporosimetry; porous silica; meteorite; porosity |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group |
| Depositing User: | J.B.W. Webber |
| Date Deposited: | 18 Apr 2009 09:22 |
| Last Modified: | 09 May 2012 09:03 |
| Resource URI: | http://kar.kent.ac.uk/id/eprint/13472 (The current URI for this page, for reference purposes) |
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