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Nonuniform Flow Dynamics Probed by Nanosecond X-Ray Speckle Visibility Spectroscopy
Yanwen Sun1, Gabriella Carini1, Matthieu Chollet1
1Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
We observed nonuniform colloidal dynamics in liquid jets using ultrafast X-ray speckle visibility spectroscopy. This method reveals flow rates and field variations in nanoparticle jets.
Area of Science:
- Physics
- Materials Science
- Chemistry
Background:
- Colloidal dynamics are crucial for understanding complex matter.
- Characterizing flow in nanoparticle jets is challenging.
Purpose of the Study:
- To observe nanosecond nonuniform colloidal dynamics in a free-flowing liquid jet.
- To develop a method for studying inhomogeneous fluctuations in complex matter.
Main Methods:
- Ultrafast X-ray speckle visibility spectroscopy.
- Utilizing a nanosecond double-bunch mode from a free electron laser.
- Analyzing anisotropy in summed speckle patterns.
Main Results:
- Observed nanosecond nonuniform colloidal dynamics.
- Evaluated average particle flow rate in a colloidal nanoparticle jet.
- Determined the nonuniform flow field within the jet.
Conclusions:
- The presented methodology enables the study of nano- and atomic-scale inhomogeneous fluctuations.
- This technique is applicable to complex matter using X-ray free electron laser sources.
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