Flow at interfaces: a new device for x-ray surface scattering investigations

Area of Science:

• Materials Science
• Surface Chemistry
• Biophysics

Background:

• Characterizing solid-liquid interfaces is crucial for understanding phenomena in colloid science, nanotechnology, and biology.
• In situ studies of dynamic interfaces, especially under flow conditions, present significant experimental challenges.

Purpose of the Study:

• To develop and demonstrate a novel fluidic cell for microbeam grazing incidence small angle x-ray scattering (GISAXS).
• To enable in situ investigation of solid-liquid interfaces in flowing systems.

Main Methods:

• Utilized a microbeam grazing incidence small angle x-ray scattering (GISAXS) technique.
• Employed a custom-designed fluidic cell with specific channel geometry.
• Performed experiments on aqueous gold nanoparticle solutions interacting with a glass substrate under flow.

Main Results:

• Successfully demonstrated the capability to probe the structure of the solid-liquid interface during fluid flow.
• Showcased the potential for in situ analysis of dynamic interfacial phenomena.
• Validated the fluidic cell's effectiveness for characterizing flowing nanoparticle solutions.

Conclusions:

• The developed fluidic cell is a powerful tool for in situ GISAXS studies of solid-liquid interfaces.
• This setup opens new avenues for studying a wide range of dynamic systems, including colloids and biological molecules.
• The ability to study interfaces during solution mixing and flow enhances our understanding of interfacial processes.