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NMR studies of molecular mobility and diffusion in porous systems.

Smith, EG, Rockliffe, JW, McDonald, PJ, Lonergan, A, Halse, MR, Leone, B and Strange, JH (1994) NMR studies of molecular mobility and diffusion in porous systems. Magn Reson Imaging, 12 (2). pp. 231-234.

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The uptake, partitioning, and release of ingredients such as water, oil, surfactant, and ions are important factors to understand and control in the design and manufacture of detergent and personal products. Although conventional pulse NMR (PNMR) spectroscopy continues to be used to analyse bulk molecular mobility and phase composition, more recently MR imaging techniques have created unique opportunities for gaining spatial information about these processes in ways that are noninvasive and potentially quantitative. This paper describes the evaluation of MRI and associated PNMR techniques to study transport in three relevant cases: ion diffusion (e.g., fluoride) in concentrated dispersions, oil transport through powders, and water ingress into porous powders (zeolite). Results are presented to illustrate the potential of multiple pulse and gradient echo MRI methods for dealing with the short T2 scenarios that represent a common problem in quantitative imaging of water in solid-containing composites involving, for instance, zeolite, or silica. Pore-size characterisation results are also presented.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Smith, EG
Rockliffe, JW
Lonergan, A
Halse, MR
Leone, B
Strange, JH
Date : 1994
Uncontrolled Keywords : Diffusion, Magnetic Resonance Imaging, Magnetic Resonance Spectroscopy, Oils, Ointments, Porosity, Powders, Water, Zeolites
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:17
Last Modified : 24 Jan 2020 23:44

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