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Energy dissipation in a dynamic nanoscale contact
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View: Figures


Image of FIG. 1.
FIG. 1.

(a, b) Topography images (Z-piezo) of two dsDNA molecules imaged in the nc mode. Molecule has then been cut and folded up by scanning in the repulsive regime. (c, d) This outcome is verified with subsequent scans of both molecules in the nc mode. Experimental parameters: (driving and natural frequencies, respectively), , , . All the images shown have been taken with and .

Image of FIG. 2.
FIG. 2.

Topographic sequence of dsDNA molecules on a mica surface with the same cantilever-sample system as that shown in Fig. 1. The value of has been systematically increased from (a) 4.5 to (l) 165 nm while keeping . The molecules submitted to the sequence have been labeled to . For easy comparison only a zoomed view of is shown whereas the full scans are shown in the supplementary material (See Ref. 29 for a full description). The values of are shown at the bottom of each panel.

Image of FIG. 3.
FIG. 3.

(a) Experimental values of (squares), (circles) and (triangles) for the sequence in Fig. 2. The values of are also shown and errors of ±12%, ±10%, and ±5% have been allowed for k, Q, and , respectively. The error bars for and , almost coincided with the average values in this logarithmic scale, thus they have not been shown for clarity. (b) Predictions (simulations) of the increase in with increasing (filled squares) when the tip radius is set to a constant value and predictions of the increase in R (outlined rhombuses) when a limit to the pressure is set . (c) Prediction of the eV dissipated per and per atom in both cases when inputting the experimental data from (a) into the model. The parameters are: , , , (surface energy), (elastic modulus of the surface), (elastic modulus of the tip).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Energy dissipation in a dynamic nanoscale contact