TITLE

Pressure cell for investigations of solid-liquid interfaces by neutron reflectivity

AUTHOR(S)
Kreuzer, Martin; Kaltofen, Thomas; Steitz, Roland; Zehnder, Beat H.; Dahint, Reiner
PUB. DATE
February 2011
SOURCE
Review of Scientific Instruments;Feb2011, Vol. 82 Issue 2, p023902
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We describe an apparatus for measuring scattering length density and structure of molecular layers at planar solid-liquid interfaces under high hydrostatic pressure conditions. The device is designed for in situ characterizations utilizing neutron reflectometry in the pressure range 0.1-100 MPa at temperatures between 5 and 60 °C. The pressure cell is constructed such that stratified molecular layers on crystalline substrates of silicon, quartz, or sapphire with a surface area of 28 cm2 can be investigated against noncorrosive liquid phases. The large substrate surface area enables reflectivity to be measured down to 10-5 (without background correction) and thus facilitates determination of the scattering length density profile across the interface as a function of applied load. Our current interest is on the stability of oligolamellar lipid coatings on silicon surfaces against aqueous phases as a function of applied hydrostatic pressure and temperature but the device can also be employed to probe the structure of any other solid-liquid interface.
ACCESSION #
58700523

 

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