Question about reading the Young's modulus from force curve

iwei posted on Thu, Apr 7 2011 11:46 AM

rated by 0 users

Dear All,

I have question about the reading the Young's modulus from the force curve.  I used PeakForce QNM for measuring mechanical properties for nanocarbon fibers.  After tip calibration, I can have mechanical images (ie. DMT modulus, log DMT modulus, Adhesion, deformation, disserpation).  Yes, I can have modulus data by making a line on the DMT modulus image, but I don't know how to read modulus from force curve.  For example, in the force (nN) vs. separation (nm) curve with two cursor, I did Hertzian fit and there is a number in 'square equation' y=(37.5 (nN/nm^2))*sqrt(1nm)*(x nm)^3/2.  Is the number of 37.5 for Young's modulus?  If not, please tell me how to read Young's modulus from force curve.  Second question, will the DMT modulus match the modulus data from force curve?

Thanks for helping,

Iwei