1. Quasi-elastic neutron scattering studies on clay interlayer-space highlighting the effect of the cation in confined water dynamics
- Author
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Tilo Seydel, Laurence P. Aldridge, Will P. Gates, Simon A. J. Kimber, Peter Fouquet, Heloisa N. Bordallo, G. Jock Churchman, Klaus Kiefer, Mark T. F. Telling, Bordallo, HM, Aldridge, LP, Churchman, Gordon John, Gates, Will, Telling, MTF, Kiefer, K, Fouquet, P, Seydel, T, Kimber, SAJ, Institut Laue-Langevin (ILL), and ILL
- Subjects
Materials science ,Mineralogy ,02 engineering and technology ,Neutron scattering ,engineering.material ,010402 general chemistry ,01 natural sciences ,Halloysite ,Inelastic neutron scattering ,Neutron spin echo ,chemistry.chemical_compound ,Surface layer ,Physical and Theoretical Chemistry ,ComputingMilieux_MISCELLANEOUS ,021001 nanoscience & nanotechnology ,[PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph] ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,General Energy ,Montmorillonite ,chemistry ,Chemical physics ,engineering ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,0210 nano-technology ,Clay minerals ,Surface water ,Composite films ,Dewatering ,Diffusion barriers ,Dynamics ,Garnets ,Kaolinite ,Minerals ,Neutron diffraction ,Neutrons ,Positive ions ,Silicate minerals ,Spin dynamics ,Sulfate minerals ,Surface diffusion - Abstract
It has long been realized that cations play a critical role in the readsorption of water into the interlayer region in clay minerals. To explore possible differences in the water dynamics related to the presence of cations in clays, and to examine the dynamics of its surface water, which plays a prominent role in diffusion of water in clay barriers a comparative study was carried out to highlight differences between water dynamics in montmorillonite and halloysite. Whereas montmorillonite has interlayer cations that interact with interlayer water, and which can rehydrate after dehydration at temperature, halloysite has no interlayer cations. Water is found in both interlayers and on the surface of these clay particles. In this study we show that by combining incoherent inelastic neutron scattering (quasi-elastic and elastic fixed window) and neutron spin echo, it was possible to discriminate the dynamics of surface water (by collapsing the interlayer region by heating and rehydrating the surface layer) fr...
- Published
- 2008
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