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Hi,
We are trying to measure the adhesion force between 48 Mm silica beads and silica substrate , and based on the theoretical model the expected value of adhesion is around 10 micro N , so what is the proper type of cantilever should we use???
Thanks
You should choose a cantilever that is sensitive as possible, but does not cause the deflection measurement to saturate or become non-linear.
The force is the spring constant times the deflection sensitivity times the detector voltage (F=K*Sd*V). If we know K for a given probe type and we know the approximate Sd (this depends on probe type, head, microscope type, and laser spot position), we can calculate the approximate detector voltage. For best linearity the detector voltage should be in the range -2V to +2V (the system can measure up to +/-12V, but it is less linear, so accuracy will usually be less).
For example, some ballpark numbers for the Multimode are:
F (nN)
K (N/m)
~Sd (nm/V)
V
Probe
10000
350
75
0.380952
DNISP-HS
150
0.888889
DNISP
30
2.222222
TAP525A
48
50
4.166667
LTESPA
Based on that I'd start with a TAP525A probe and see how it works.
--Bede
Thanks Bede!
This may be a bit out of the topic but I would also like to inquire what suggestions you may have for measurements of elastic modulus for ceramic samples with roughness of 0.4-2 microns..
Thank you
please see the response in your other thread: http://nanoscaleworld.bruker-axs.com/nanoscaleworld/forums/t/1445.aspx