Surface Force Measurement Solutions, Training, and Research
Our Surface Forces Apparatus (SFA) systems combined with multiple-beam interferometry can measure forces (static- equilibrium or dynamic- non-equilibrium) between two surfaces in vapors or liquids with a sensitivity of a few nN and a distance resolution of 1Å (0.1 nm).
Our Fiber Adhesion and Friction Apparatus (FAFA) can measure the surface forces between two fibers (10s um in diameter) or between a fiber and a surface with a sensitivity of a few uN.
FIBER ADHESION AND FRICTION APPARATUS
The FAFA 2020 system is SurForce’s newest surface forces measurement system. The system is custom designed to rapidly perform fiber adhesion and friction measurements utilizing high-rate imaging techniques. The system includes an optical table, dedicated high-frame rate video acquisition computer hosting a user-friendly MATLAB GUI for data acquisition and reduction and an enclosure outfitted with humidity & temperature sensing.
The uSFA, or micro-SFA, is a new, compact, microscope-ready SFA for measuring the normal forces between surfaces and other interfacial phenomena. The compact chamber accommodates typical short focal length, large diameter, objectives needed for fluorescence, confocal and other common high magnification microscopy techniques. Our latest option for the uSFA line is our Electrochemcial, or EC-uSFA.
The SFA 2000 is our full-featured configurable SFA offering the imposition and measurement of both normal and shear forces. Friction configurations (FD-SFA) support 1D and 2D friction sensing and load sensing using either metal-film, or high-sensitivity semiconducting, strain gauging.
|In this work , teams from the Polish Academy of Sciences, Princeton University, Universities of Warsaw, Oxford and Bordeaux together with CNRS in Pessac France use a Surface Forces Apparatus (SFA) to measure long-range repulsive forces between oppositely charged surfaces when the inter-surface region is filled with an aqueous electrolyte and driven by an AC electric field. Measurements as described are possible using either the SurForce SFA 2000 or uSFA systems.|
"The SFA technique is the gold standard for measuring forces between surfaces.”
Professor Tonya Kuhl
"I don't know of another technique that can simultaneously measure surface forces, absolute surface separation and provide direct visualization of the contact area to unequivocally determine the surface energy.”
Dr. Matthew Tirrell
"The SurForce team is very helpful in achieving our research needs. I am looking forward to acquiring the new uSFA to complement our SFA 2000."
Professor Dong-Woog Lee
"The SFA is critical to our research needs. The SurForce Team provided us with an SFA turn-key system greatly simplifying our procurement and continues to support system customization through insightful and comprehensive engineering design services."
Dr. Jing Yu
Recent SFA Users
Receive SFA tips, recent findings, event news, and more!