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2.5. Calibration of Microfabricated Loadcells The accurate measurement of the force applied to the CNFs required precise calibration of the loadcells. For some devices this calibration was performed by using a commercial loadcell with 50 g capacity. The loadcell tip was attached to the device substrate by an adhesive. The other end of the loadcell was attached to a thin glass grip as described before to load the CNFs. Then, the substrate was actuated with the external picomotor. The loadcell opening was recorded by a CCD camera and the images were used to obtain the loadcell opening vs. time plot shown in Figure 2.9(a). The 50 g loadcell provided the corresponding load vs. time data, which were used to construct the plot shown in Figure 2.9(b). The loading and unloading segments were identical and linear for loadcell openings of ~8 m. From the slope of the two plots the loadcell stiffness was calculated as 166 N/m. 19PDF Image | HIGH STRENGTH CARBON NANOFIBERS DERIVED FROM ELECTROSPUN POLYACRYLONITRILE
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