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OK John, thanks for the answer, that explains it perfectly! pete
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I am reading a paper in which the authors used a Dimension Icon (Nanoscope 5) to do MFM. They show what they say are "frequency" images in MFM lift mode. I was not aware that there was a frequency signal. in fact, I thought the drive frequency was fixed, and there wasn't a way to measure directly the oscillation frequency on this system
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This is surprising. Usually the XRD will tend to underestimate the particles size, no overestimate it. If you see features of 2 nm height 15nm across, they are probably spheres. You could do TEM to check (although they are pretty small, you need a reasonably good TEM). I should think the most likely explanation is that the 2nm spheres are there, but
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Don, I just keep the water close din the fridge. the main thing is to only pour out of the bottle, and keep it closed as much as possible. It should last OK at room temperature as well... Regards, Pete.
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The water I use is "water for molecular biology", the item code for this is W4502. If this differs from W3513, I cannot be sure, it looks quite similar on the sigma site. But I have tried another water they sold "water for cell culture" W3500, and it was not as good as W4502. The bubble trap I never used. When we dry we use Argon
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This is a very large scan, with a high Z scale as well. You don't say what the sample is, or the Scanning conditions, but my first thought would be to try a very low scan rate, to compensate for the very long scan lines (i.e. Tip velocity = Scansize x scan rate). You could try scan rates of 0.25 Hz, and see if that helps. Tip and/or sample contamination
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I believe that yes, it is exactly the same thing. it would be nice to hear someone from Bruker confirm this, though.
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Hi Sandeep. MFM in contact mode makes very little sense...when close to the surface, magnetic force are completely swamped by other short range forces. It is necessary to remove the probe form the surface to detect magnetic forces. As John said, removing the probe a SHORT distance, with very flexible levers will be close to impossible in ambient conditions
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Hi Sandeep, you can do this by Nanoindentation...this is available on all instruments. For literature, I would recommend you look at the section in chapter 3 of my book: Atomic Force Microscopy by Peter Eaton and Paul West, OUP (2010), ISBN:978-0-19-957045-4. There are also some examples of nanoindentation use to get elastic properties in chapter 7
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Hi Stefano, As a "user", I would say that Ben's answer, is pretty much right. The "low noise" laser has a somewhat confusing name...for standard imaging AFM, in cases where laser interference is not an issue, it will not reduce noise. But, when laser lines do appear, they are a real pain, so it will definitely help in these cases