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Multimodal Miniature Surface Forces Apparatus (μSFA) for Interfacial Science Measurements
Kai Kristiansen1, Stephen H Donaldson2, Zachariah J Berkson1
1Department of Chemical Engineering , University of California Santa Barbara , Santa Barbara , California 93106 , United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 1, 2019
Summary
A new miniature Surface Forces Apparatus (μSFA) enables portable, multimodal surface interaction studies. This device integrates with microscopes for simultaneous force and spectroscopy measurements, advancing interfacial science.
Area of Science:
- Surface Science and Interfacial Phenomena
- Nanotechnology and Materials Characterization
- Physical Chemistry and Biophysics
Background:
- Advancements in understanding intermolecular and surface interactions rely on improved measurement techniques.
- Traditional Surface Forces Apparatus (SFA) models provide accurate force measurements but lack portability and multimodal capabilities.
Purpose of the Study:
- To introduce a novel miniature Surface Forces Apparatus (μSFA) designed for enhanced usability and multimodal characterization.
- To demonstrate the integration of the μSFA with optical microscopy for concurrent force and spectroscopic analysis.
- To enable in situ chemical and biological characterization alongside physical force measurements of interfacial phenomena.
Main Methods:
- Development and implementation of a miniature Surface Forces Apparatus (μSFA).
- Integration of the μSFA with optical and fluorescence light microscopes.
- Concurrent force measurements with Surface Plasmon Resonance (SPR) and Raman spectroscopy, utilizing an interferometric technique for distance calculation.
Main Results:
- The μSFA retains the accurate force and distance measurement capabilities of previous SFA models.
- Demonstrated portability and compatibility with standard microscopy techniques.
- Successful combination of force measurements with SPR and Raman spectroscopy, showcasing multimodal interfacial analysis.
Conclusions:
- The μSFA represents a significant advancement, transitioning SFA usage towards concurrent physical, chemical, and biological characterization.
- This new apparatus facilitates in-depth studies of molecular adsorption, fluid dynamics, surface properties, and binding kinetics.
- The μSFA is poised to broaden the scope of research into complex interfacial phenomena.
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