High-pressure cell for neutron reflectometry of supercritical and subcritical fluids at solid interfaces

The Review of Scientific Instruments
Justin R CarmichaelDavid R Cole

Abstract

A new high-pressure cell design for use in neutron reflectometry (NR) for pressures up to 50 MPa and a temperature range of 300-473 K is described. The cell design guides the neutron beam through the working crystal without passing through additional windows or the bulk fluid, which provides for a high neutron transmission, low scattering background, and low beam distortion. The o-ring seal is suitable for a wide range of subcritical and supercritical fluids and ensures high chemical and pressure stability. Wafers with a diameter of 5.08 cm (2 in.) and 5 mm or 10 mm thickness can be used with the cells, depending on the required pressure and momentum transfer range. The fluid volume in the sample cell is very small at about 0.1 ml, which minimizes scattering background and stored energy. The cell design and pressure setup for measurements with supercritical fluids are described. NR data are shown for silicon/silicon oxide and quartz wafers measured against air and subsequently within the high-pressure cell to demonstrate the neutron characteristics of the high-pressure cell. Neutron reflectivity data for supercritical CO(2) in contact with quartz and Si/SiO(2) wafers are also shown.

References

Mar 5, 2009·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Alla Oleinikova, Ivan Brovchenko
Mar 3, 2011·The Review of Scientific Instruments·Martin KreuzerReiner Dahint
Mar 3, 2011·The Review of Scientific Instruments·Christoph JeworrekRoland Winter

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Citations

Dec 25, 2013·Journal of Synchrotron Radiation·Florian J WirkertMetin Tolan

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Methods Mentioned

BETA
neutron scattering
neutron reflectometry
small-angle neutron scattering

Software Mentioned

ABAQUS

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