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    Linear ripples and traveling circular ripples produced on polymers by thermal AFM probes

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    COPE_181.pdf (478.3Kb)
    Date
    2009-06
    Author
    Gnecco, Enrico
    Riedo, Elisa
    King, William P.
    Marder, Seth R.
    Szoszkiewicz, Robert
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    Abstract
    We discuss the time and temperature evolution of the nanometer-scale surface undulations (ripples) produced by a heated atomic force microscope (AFM) tip scanning across surfaces of several amorphous polymers. During linear zigzag scanning we obtain pseudolinear ripples approximately perpendicular to the fast scan direction in a range of scan rates and probe temperatures. As expected, the size of the ripples increases massively in the vicinity of the glass temperature for each polymer. We also examine a different case in which the AFM tip follows a circular path. Contrary to the ``steady{\'\' circular ripples which rotate along the scanning path during consecutive scans. The group velocity of the circular ripples is 2 orders of magnitude lower than the scan speed. We interpret the experimental data using a phenomenological model accounting for erosion and smoothing effects caused by the probing tip.
    URI
    http://hdl.handle.net/1853/46211
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