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Rapid Atomic Force Microscope Captures Nanomovies

May 9th, 2005 Medgadget Editors Nanomedicine

Atomic Force Microscope
Scientists have demonstrated that an atomic force microscope can capture images of processes with a time resolution of microseconds. From an article at the PhysicsWeb:

An atomic force microscope (AFM) works by measuring how the force between the sample and a tiny “tip” on a cantilever changes as the microscope is moved over the surface of the sample. This allows the AFM to record images with extremely high spatial resolutions. Previous attempts to increase the time resolution of AFMs have focused on scanning the tip over the sample as quickly as possible, but these techniques have had time resolutions of a few tens of milliseconds at best.
Higher temporal resolutions can be obtained by using the AFM in a “force-sensing” mode, which can detect movements from a single point on a sample. Moshiur Anwar of the Massachusetts Institute of Technology (MIT) and the University of California at San Francisco and Itay Rousso of MIT and the Weizmann Institute of Science have now developed a technique in which a series of individual force-sensing measurements are combined to construct images.
The new “step-scan” technique relies on breaking down a sample into individual pixels and then measuring the dynamics of each pixel separately with the AFM. The method, which only works for period processes, can resolve features 10 nanometres across with a time resolution of 5 microseconds.
“The temporal resolution is not affected by the scan area and is limited only by the resonance frequency of the AFM cantilever and the data acquisition electronics – which is often not a limiting factor,” Rousso told PhysicsWeb. “The beauty of the technique is that it does not require any complicated and expensive modifications to the microscope and can be applied to almost any commercial system.”

The MIT’s Technology Review talks about the implications…
More about atomic force microscopy…
Flashback: Magnetic-Resonance Force Microscopy.
(hat tip: Future Feeder)

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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