Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 82, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3505797
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- Helmholtz-Zentrum Berlin
- German Ministry for Education and Science (BMBF) [03DA6HEI, 05KN7VH1]
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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 degrees 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 cm(2) 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3505797]
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