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The cycle averaging of Tapping limits performance because 1) the high resolution tip-sample interaction only occurs when the tip is close to the sample, and this is a fraction of the cycle, and 2) at low imaging forces, the effects of long range forces dominate the cycle. (This is also why atomic Tapping images are done in fluid. . . eliminate the long
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See this new paper on ultrahigh resolution imaging and mechanical mapping of bacteriorhodopsin. http://pubs.acs.org/doi/abs/10.1021/nl202351t. I thought I would post this link as nice example of the science that can be done using the AFMs high resolution imaging power, coupled with the inherent information available from mechanical tip-sample interaction
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It’s good to see some community attempts at replicating the performance of the Dimension FastScan. The video is of a 1um, 512x512, 23Hz, scan of Celgard® taken with the Dimension FastScan. This demonstration is over twice as fast as the 10Hz video we showed previously, additionally we demonstrate the Celgard® with the mesh oriented a couple
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HF Etched Mica. The video shows a Survey at 20um @ 4.8Hz, followed by a high resolution image at 4um @ 20Hz, followed by a video at 0.66um 55Hz. Hard flat samples are not that challenging for a high speed system because they don't challenge the z-actuator or slew rate (power) of the electronics.
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I was reading an AFM site and saw a contrived claim trying to make a comparison that was over 50% off the benchmark and thought it would be a good topic to open up for discussion. The comment was to the effect of: by scanning at a slower scan speed we are actually going faster because our poor scanner dynamics require so much rounding we have to make
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It’s good to see some community attempts at replicating the performance of the Dimension FastScan. The screen shot below is of a 1um, 512x512, 22Hz, Video of Celgard® taken with the Dimension FastScan (Video link at end). This demonstration is over twice as fast as the 10Hz video we show above. As you start to see different images and movies
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It’s good to see some community attempts at replicating the performance of the Dimension FastScan. The screen shot below is of a 1um, 512x512, 22Hz, Video of Celgard® taken with the Dimension FastScan (Video link at end). This demonstration is over twice as fast as the 10Hz video we show above. As you start to see different images and movies
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This experiment shows 275, 5um, 1024x1024 pixel image, taken at 17Hz (170um/s tip velocity). Each image is analyzed using the blind reconstruction method in the NanoScope SW to determine the estimated tip diameter, and is plotted versus image number. The results show that over this entire 270 image sequence, the tip remains extremely sharp and virtually
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Nothing like a quality sample preparation (thanks Natalia!) and an awesome AFM to get great soft-sample high-speed images (thanks Shuiqing & Adam!). This new video shows height and phase of freshly prepared Celgard; the images are at ~20um/s or 10Hz scan rate for 1um images. In the video, we also tried to showcase a lot of the ease-of-use features
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Excerpts of Figure 13.25 and 13.29 from Magonov and Whangbo,"Surface Analysis with STM and AFM," VCH (1996). See video: for FastScan images