The Nanoscale World

DMT modulus with negative values??

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psuxi posted on Wed, Aug 29 2012 10:19 AM

I calibrated the tip in ramp mode on clean hard surface first and then used it for imageing. I got DMT modulus mapping range from negative values to positive ones such as -2 MPa to 5 MPa.

Any one knows why this is happening? Is this DMT modulus mapping result meaningful at all?

Thanks!

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