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@ARTICLE{Ahmed:903117,
      author       = {Ahmed, Daniel and Sukhov, Alexander and Hauri, David and
                      Rodrigue, Dubon and Maranta, Gian and Harting, Jens and
                      Nelson, Bradley J.},
      title        = {{B}ioinspired acousto-magnetic microswarm robots with
                      upstream motility},
      journal      = {Nature machine intelligence},
      volume       = {3},
      number       = {2},
      issn         = {2522-5839},
      address      = {[London]},
      publisher    = {Springer Nature Publishing},
      reportid     = {FZJ-2021-04841},
      pages        = {116 - 124},
      year         = {2021},
      abstract     = {The ability to propel against flows, that is, to perform
                      positive rheotaxis, can provide exciting opportunities for
                      applications in targeted therapeutics and non-invasive
                      surgery. So far no biocompatible technologies exist for
                      navigating microparticles upstream when they are in a
                      background fluid flow. Inspired by many naturally occurring
                      microswimmers—such as bacteria, spermatozoa and
                      plankton—that utilize the no-slip boundary conditions of
                      the wall to exhibit upstream propulsion, here we report on
                      the design and characterization of self-assembled
                      microswarms that can execute upstream motility in a
                      combina-tion of external acoustic and magnetic fields. Both
                      acoustic and magnetic fields are safe to humans,
                      non-invasive, can pen-etrate deeply into the human body and
                      are well-developed in clinical settings. The combination of
                      both fields can overcome the limitations encountered by
                      single actuation methods. The design criteria of the
                      acoustically induced reaction force of the microswarms,
                      which is needed to perform rolling-type motion, are
                      discussed. We show quantitative agreement between
                      experi-mental data and our model that captures the rolling
                      behaviour. The upstream capability provides a design
                      strategy for deliv-ering small drug molecules to
                      hard-to-reach sites and represents a fundamental step
                      towards the realization of micro- and nanosystem navigation
                      against the blood flow.},
      cin          = {IEK-11},
      ddc          = {004},
      cid          = {I:(DE-Juel1)IEK-11-20140314},
      pnm          = {1215 - Simulations, Theory, Optics, and Analytics (STOA)
                      (POF4-121) / DFG project 366087427 - Magnetokapillare
                      Mikroroboter zum Einfangen und zum Transport von Objekten an
                      Flüssiggrenzflächen (366087427)},
      pid          = {G:(DE-HGF)POF4-1215 / G:(GEPRIS)366087427},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34258513},
      UT           = {WOS:000607597200002},
      doi          = {10.1038/s42256-020-00275-x},
      url          = {https://juser.fz-juelich.de/record/903117},
}