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Thread: Robotic swimmers, self-propelling nanomotors, Max Planck Research Group Peer Fischer, Stuttgart, Germany

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    Robotic swimmers, self-propelling nanomotors, Max Planck Research Group Peer Fischer, Stuttgart, Germany

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    Scientific Work was conducted in the Lab for Micro Nano and Molecular Systems, Prof. Peer Fischer
    Max Planck Institute for Intelligent Systems, Stuttgart, Germany

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    Fabrication of worlds smallest propeller

    Tissue and biological fluids are complex viscoelastic media with a nanoporous macromolecular structure. Here, we demonstrate that helical nanopropellers can be controllably steered through such a biological gel. The screw-propellers have a filament diameter of about 70 nm and are smaller than previously reported nanopropellers as well as any swimming microorganism. We show that the nanoscrews will move through high-viscosity solutions with comparable velocities to that of larger micropropellers, even though they are so small that Brownian forces suppress their actuation in pure water. When actuated in viscoelastic hyaluronan gels, the nanopropellers appear to have a significant advantage, as they are of the same size range as the gel’s mesh size. Whereas larger helices will show very low or negligible propulsion in hyaluronan solutions, the nanoscrews actually display significantly enhanced propulsion velocities that exceed the highest measured speeds in Newtonian fluids. The nanopropellers are not only promising for applications in the extracellular environment but small enough to be taken up by cells. (ACS Nano (2014), DOI: 10.1021/nn502360t.)

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    A Swimming Micro-Scallop

    Biological microorganisms swim with flagella and cilia that execute non reciprocal motions for low Reynolds number (Re) propulsion in viscous fluids. This symmetry requirement is a consequence of Purcell’s scallop theorem, which complicates the actuation scheme needed by micro-swimmers. However, most biomedically important fluids are non-Newtonian where the scallop theorem no longer holds. It should therefore be possible to realize a micro-swimmer that moves with reciprocal periodic body-shape changes in non-Newtonian fluids. Here, we report a symmetric “micro-scallop”, a single-hinge micro-swimmer that can propel in shear thickening and shear thinning (non-Newtonian) fluids by reciprocal motion at low Re. Excellent agreement between our measurements and both numerical and analytical theoretical predictions indicates that the net propulsion is caused by modulation of the fluid viscosity upon varying the shear rate. This reciprocal swimming mechanism opens new possibilities in designing biomedical micro-devices that can propel by a simple actuation scheme in non-Newtonian biological fluids. (Nat. Commun. 5: 5119 (2014). doi: 10.1038/ncomms6119.)

    Tian Qiu, Tung-Chun Lee, Andrew G. Mark, Konstantin I. Morozov, Raphael
    Munster, Otto Mierka, Stefan Turek, Alexander M. Leshansky, and Peer
    Fischer. Swimming by Reciprocal Motion at Low Reynolds Number. Nat. Commun.
    5: 5119 doi: 10.1038/ncomms6119 (2014).

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    Helical Micro and Nanopropellers for Applications in Biological Fluidic Enviroments

    Video for Design challenge:
    Video entry won the “Microrobotics Design Challenge” at the Hamlyn Symposium in London. (June, 2016).
    Helical Micro and Nanopropellers for Applications in Biological Fluidic Enviroments
    Debora Walker, Tian Qiu, Andrew G. Mark, Alejandro Posada, Peer Fischer

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    "Shape-programmable miniscule robots"
    Soft materials that can use magnetic fields to generate desired time-varying shapes could provide an engine for microswimmers

    September 26, 2016

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    This robot can walk and swim — inside you

    Published on Jan 24, 2018

    A tiny robot with moves inspired by caterpillars and jellyfish is small enough to crawl, walk and swim inside the human body.
    "This Tiny Robot Walks, Crawls, Jumps and Swims. But It Is Not Alive."

    by James Gorman
    January 24, 2018

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    Why a robot might crawl through your body

    Published on Mar 16, 2018

    This four millimetre long robot was designed by the Max Planck Institute for Intelligent Systems to move through the human body. It can walk, roll, swim, jump and even carry cargo and may be used in minimally invasive surgery or to deliver drugs to specific parts inside the body.

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