Liquid Surface X-ray Scattering
Langmuir Trough
The Langmuir Trough was custom built for the liquid surface scattering measurements. The main features include:
- Multi-trough inserts: Different trough size/volumes using multiple-trough inserts.
- Temperature control: a Lakeshore, Model 330 is used to control sample temperature, and has the capability for both heating and cooling. (Maximum temperature ~40°C)
- Sealing: near-hermetic sealing allows for the introduction of helium into the sample environment, thereby minimizing ozone production (monitored by an oxygen sensor) and x-ray absorption.
- Software: a widely used package from Nima Technology Inc. controls the barrier motion and Wilhelmy plate pressure sensor readout.
- Common operational modes: isothermal compressions and constant pressure or area control.
- Compression: a compression ratio of 10:1 may be achieved withoutsimultaneous x-ray measurement, and up to 5:1 for measurements with x-rays.
The trough is currently available for general users. When not in use for x-ray experiments, the trough may be used offline in 15ID-C hutch
Technical Specifications
Dimensions of liquid footprint without the barrier:
- Length: 42.0 cm
- Width: 8.9 cm
- Usable Area (no x-rays): 35-335 cm2
- Usable Area (x-rays): 120-335 cm2 (actual min. area may be reduced slightly more)
- Depth (no meniscus): 7.0 mm
- Recommended Fill Volume: 350 mL
- Barrier speed range: 0.01 – 0.5 mm/s
- Control software: Nima v5.16
Acknowledgments
The following people contributed to the design and construction of this trough: Binhua Lin, David Schultz, C. Pullins, J. Gebhardt (NSF’s ChemMatCARS), Ka Yee Lee, Maria Ratajczak, GuoHui Wu, Canay Ege, Steve Danauskas, (U of Chicago Chemistry) and Mark Schlossman (UIC Physics). The upgrade of the trough to accommodate multi-trough inserts is done by Frank Westferro and Harold Brewer.
Liquid Surface/Interface Contact
Wei Bu
(630) 252-0470
weibu@uchicago.edu
Liquid Surface/Interface Links
The following links provide further information regarding our liquid surface/interface x-ray scattering setup: