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(a) Patterned multiwalled carbon nanotube ensembles of varying sizes. (b) The shearing of carbon nanotube arrays, in a scanning electron microscope in situ, as modeled through cantilever beam theory (dark outline). (c) Schematic of the experimental setup for observing the nanotube deflections during fluid flow (The insets determine the light orientation relative to the CNT ensembles).
(a) The variations in the transmitted laser intensity are a very sensitive function of the fluid velocity and can be used for the (b) digital calibration of the flow. (c) The data points show a decrease in the transmission with increased nanotube deflection. The analytical fit to the data is from an independent measurement of deflection through CCD image processing.
The deflection of carbon nanotube arrays, obtained through the CCD image processing, is plotted as a function of air velocity for a (a) and (b) a CNT ensemble and fitted through simulations to the . (c) The fits were also done through measured photodetector intensity variation.
(a) A close correspondence between our experimental results (data points) and previous molecular dynamics and computational fluid dynamics simulations. (b) Prediction of the nanotube deflection as a function of CNT height and average air velocity.
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