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High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water

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Flow cell for neutron spectroscopy.

Max Wolff¹, Bernhard Frick, Andreas Magerl

¹Institut Max von Laue-Paul Langevin, 38042 Grenoble, France. v-wolff@ill.fr

Physical Chemistry Chemical Physics : PCCP

|October 2, 2009

Summary

This summary is machine-generated.

This study introduces a novel flow cell for studying liquid dynamics using neutron scattering. The new cell enables precise measurement of liquid diffusion and flow velocity in narrow slits.

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Area of Science:

Neutron scattering physics
Fluid dynamics
Materials science

Background:

Quasielastic neutron scattering (QNS) is a powerful technique for probing microscopic atomic diffusion.
Recent advancements allow studying macroscopic liquid flow using inelastic Doppler scattered neutrons.
Previous studies utilized shear cells in plate-plate geometry.

Purpose of the Study:

To present a novel flow cell designed for studying liquids flowing through narrow slits.
To demonstrate the cell's performance in characterizing liquid transport properties.
To enable simultaneous measurement of diffusion and flow velocity.

Main Methods:

Development and application of a new flow cell for narrow slit geometries.
Utilizing quasielastic neutron scattering to determine diffusion mechanisms and constants.
Employing inelastic Doppler scattered neutrons to extract liquid flow velocity.
Performing measurements on multiple instruments with different liquids.

Main Results:

The new flow cell effectively facilitates the study of liquid flow in confined geometries.
Diffusion coefficients and mechanisms were accurately determined using QNS.
Liquid velocities were successfully extracted from inelastic scattering data.
The cell's performance was validated across different instruments and liquid samples.

Conclusions:

The developed flow cell expands the capabilities of neutron scattering for fluid dynamics research.
This method allows for in-situ characterization of both diffusion and flow in liquids within narrow channels.
The findings pave the way for advanced studies of fluid behavior in microfluidic and porous media.