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      Why can’t you separate interleaved books?

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      Physics Today
      AIP Publishing

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          Low-friction nanoscale linear bearing realized from multiwall carbon nanotubes

          Cumings, Zettl (2000)
          We demonstrate the controlled and reversible telescopic extension of multiwall carbon nanotubes, thus realizing ultralow-friction nanoscale linear bearings and constant-force nanosprings. Measurements performed in situ on individual custom-engineered nanotubes inside a high-resolution transmission electron microscope demonstrated the anticipated van der Waals energy-based retraction force and enabled us to place quantitative limits on the static and dynamic interwall frictional forces between nested nanotubes. Repeated extension and retraction of telescoping nanotube segments revealed no wear or fatigue on the atomic scale. Hence, these nanotubes may constitute near perfect, wear-free surfaces.
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            Ultrahigh interlayer friction in multiwalled boron nitride nanotubes.

            Friction at the nanoscale has revealed a wealth of behaviours that depart strongly from the long-standing macroscopic laws of Amontons-Coulomb. Here, by using a 'Christmas cracker'-type of system in which a multiwalled nanotube is torn apart between a quartz-tuning-fork-based atomic force microscope (TF-AFM) and a nanomanipulator, we compare the mechanical response of multiwalled carbon nanotubes (CNTs) and multiwalled boron nitride nanotubes (BNNTs) during the fracture and telescopic sliding of the layers. We found that the interlayer friction for insulating BNNTs results in ultrahigh viscous-like dissipation that is proportional to the contact area, whereas for the semimetallic CNTs the sliding friction vanishes within experimental uncertainty. We ascribe this difference to the ionic character of the BN, which allows charge localization. The interlayer viscous friction of BNNTs suggests that BNNT membranes could serve as extremely efficient shock-absorbing surfaces.
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              Leonardo da Vinci’s Friction Experiments: An Old Story Acknowledged and Repeated

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                Author and article information

                Journal
                Physics Today
                Physics Today
                AIP Publishing
                0031-9228
                1945-0699
                June 2016
                June 2016
                : 69
                : 6
                : 74-75
                Article
                10.1063/PT.3.3208
                eb89ac88-4e68-4a5f-8e11-55c1a7a4f141
                © 2016
                History

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