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Related Experiment Video

Updated: May 28, 2026

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters

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Published on: February 16, 2019

The extended surface forces apparatus. IV. Precision static pressure control.

E Schurtenberger¹, M Heuberger

¹Empa, Materials Science and Technology, CH-9014 St. Gallen, Switzerland.

The Review of Scientific Instruments

|November 4, 2011

Summary

This summary is machine-generated.

Researchers developed a novel pressurized extended surface forces apparatus (eSFA) for precise surface force measurements in fluids. This instrument enables stable and reproducible experiments across a wide range of pressures and temperatures.

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Area of Science:

Materials Science
Physical Chemistry
Nanotechnology

Background:

Direct surface force measurements are crucial for understanding interfacial phenomena.
Existing surface forces apparatus (SFA) typically operate under ambient conditions, limiting studies in controlled fluid environments.
Studying fluids at different points in their phase diagrams requires precise control over pressure and temperature.

Purpose of the Study:

To design and build a novel extended surface forces apparatus (eSFA) integrated into a pressurized system.
To enable direct surface force measurements in equilibrium with fluids under controlled static pressure and temperature.
To investigate the behavior of fluids and interfaces across various phase conditions.

Main Methods:

An autoclave housing a miniature eSFA was constructed.
External coarse approach under ambient conditions pre-adjusts surface separation to ~3 μm.
Internal magnetic drive allows sub-Ångstrom precision control over 14 μm range within the autoclave.
Autoclave pressure controlled from 20 mbar to 170 bar; temperature from -20 to 60 °C.
Demonstrated operation with gaseous and liquid carbon dioxide.

Main Results:

The instrument successfully performed surface force measurements under elevated pressures.
Measurement stability and reproducibility were comparable to conventional eSFA operated at ambient conditions.
Decoupling the eSFA mechanical loop from the autoclave structure enhanced performance.

Conclusions:

The developed pressurized eSFA is a viable tool for surface force measurements in controlled fluid environments.
This instrument opens new possibilities for studying fluid phase behavior and interfacial forces.
The design ensures high precision and reproducibility even under demanding experimental conditions.