How can I measure a powder in AFM (I don't have the platform to measure in liquids, just solids)?
What kind of powder is it? are interested in the particle size and morphology of the particles in the powder?
In such a case I would try to rub the powder on a freshly cleaved graphite surface. And remove any excess by blowing with dry nitrogen.
Good luck!
The measurement of powders by AFM is really difficult to do. A method of fixing the powder to a flat substrate is required or you end up with particle movement. What about pinching methods from histology and using a resin to set the powder? Depending on the hardness of the particles it may be difficult to cut a section. However it may be possible to sprinkle the particles on to surface of a setting resin. Flicking a paint brush with the particles on may help or for a more scientific approach use a twin stage impinger. Both of these are methods would be able to deposit the powder onto the setting surface. Once set the mechanical properties of the powder and resin should be different enough to get resolution between particle and substrate. Regards Paul
You can use carbon tape to stuck the powder and can use the solid sample holder to serve the purpose. Start with a very small scan area and then gradually increase the area in multiple steps. If surface roughness is low then you will face no problem. If roughness is high choose another position as roughness is random. It is trial and error method.
All the best!
Hi Laura, I have the same question now. Finally, how you used AFM for powder?
Thanks,
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