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@ARTICLE{Tiwari:873543,
      author       = {Tiwari, Avinash and Persson, Bo},
      title        = {{P}hysics of suction cups},
      journal      = {Soft matter},
      volume       = {15},
      number       = {46},
      issn         = {1744-6848},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {FZJ-2020-00811},
      pages        = {9482 - 9499},
      year         = {2019},
      abstract     = {We have developed a theory of air leakage at interfaces
                      between two elastic solids with application to suction cups
                      in contact with randomly rough surfaces. We present an
                      equation for the airflow in narrow constrictions which
                      interpolates between the diffusive and ballistic (Knudsen)
                      air-flow limits. To test the theory, we performed
                      experiments using two different suction cups, made from soft
                      polyvinylchloride (PVC), in contact with sandblasted
                      polymethylmethacrylate (PMMA) plates. We found that the
                      measured time to detach (lifetime) of the suction cups was
                      in good agreement with theory, except for surfaces with a
                      root-mean-square (rms) roughness below ≈1 μm, where
                      diffusion of plasticizer from the PVC to the PMMA surface
                      caused blockage of critical constrictions. The suction cup
                      volume, stiffness, and elastic modulus have a huge influence
                      on the air leakage and hence the failure time of the cups.
                      Based on our research we propose an improved biomimetic
                      design of suction cups that could show improved failure
                      times with varying degrees of roughness under dry and wet
                      environments.},
      cin          = {IAS-1 / PGI-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106},
      pnm          = {141 - Controlling Electron Charge-Based Phenomena
                      (POF3-141)},
      pid          = {G:(DE-HGF)POF3-141},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31701113},
      UT           = {WOS:000502539900007},
      doi          = {10.1039/C9SM01679A},
      url          = {https://juser.fz-juelich.de/record/873543},
}