8:00 PM - FF02.03.07
Nanofluidics in Smectite Clays
Jon Fossum2,Leide Cavalcanti1,2,Heloisa Bordallo3,Kenneth Knudsen4
ISIS Neutron Source1,Norwegian University of Science and Technology2,University of Copenhagen3,Institute for Energy Technology4
New physical effects have been shown to be possible in “ultrasmall confined spaces”  such as higher viscosity or higher mobility among others. Here we present clay minerals as possible materials for the study of nanofluidics. Clays are nano-silicate layered materials with structural properties that can be modified and controlled for intercalation and transport of foreign molecules in their 2D nanospace. Intercalation of water in smectite clays occurs naturally and has been extensively studied with a wide range of techniques, among them neutron  and X-ray scattering . Water dynamics in smectite clay interlayers has been studied extensively. Recent experiments and simulations have shown that CO2 can intercalate and flow in smectite clay interlayers provided from external bulk gaseous,liquid or supercritical CO2 . We have demonstrated that under certain conditions of pressure and temperature, fluorohectorite smectite clays are able to capture a large amount of CO2 in this way, depending on the type of charge compensating cation residing in the interlayer [5,6,7]. We have investigated fluorohectorite clays with three different cations (Na+, Ni+2 and Li+), suggesting the formation of a stable CO2 complexation with the clay interlayer cation. Thus, clays could also be used as a model for nanofluidics of CO2.
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