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      Development of a Sperm-Flagella Driven Micro-Bio-Robot

      1 , 1 , 1

      Advanced Materials

      Wiley

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          Abstract

          A new biohybrid micro-robot is developed by capturing bovine sperm cells inside magnetic microtubes that use the motile cells as driving force. These micro-bio-robots can be remotely controlled by an external magnetic field. The performance of micro-robots is described in dependence on tube radius, cell penetration, and temperature. The combination of a biological power source and a microdevice is a compelling approach to the development of new microrobotic devices with fascinating future applications.

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          Most cited references 34

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          Microscopic artificial swimmers.

          Microorganisms such as bacteria and many eukaryotic cells propel themselves with hair-like structures known as flagella, which can exhibit a variety of structures and movement patterns. For example, bacterial flagella are helically shaped and driven at their bases by a reversible rotary engine, which rotates the attached flagellum to give a motion similar to that of a corkscrew. In contrast, eukaryotic cells use flagella that resemble elastic rods and exhibit a beating motion: internally generated stresses give rise to a series of bends that propagate towards the tip. In contrast to this variety of swimming strategies encountered in nature, a controlled swimming motion of artificial micrometre-sized structures has not yet been realized. Here we show that a linear chain of colloidal magnetic particles linked by DNA and attached to a red blood cell can act as a flexible artificial flagellum. The filament aligns with an external uniform magnetic field and is readily actuated by oscillating a transverse field. We find that the actuation induces a beating pattern that propels the structure, and that the external fields can be adjusted to control the velocity and the direction of motion.
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            Controlled propulsion of artificial magnetic nanostructured propellers.

            For biomedical applications, such as targeted drug delivery and microsurgery, it is essential to develop a system of swimmers that can be propelled wirelessly in fluidic environments with good control. Here, we report the construction and operation of chiral colloidal propellers that can be navigated in water with micrometer-level precision using homogeneous magnetic fields. The propellers are made via nanostructured surfaces and can be produced in large numbers. The nanopropellers can carry chemicals, push loads, and act as local probes in rheological measurements.
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              Magnetic helical micromachines: fabrication, controlled swimming, and cargo transport.

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                Author and article information

                Journal
                Advanced Materials
                Adv. Mater.
                Wiley
                09359648
                December 2013
                December 2013
                September 01 2013
                : 25
                : 45
                : 6581-6588
                Affiliations
                [1 ]Institute for Integrative Nanosciences; IFW Dresden; Helmholtzstraße 20 01069 Dresden Germany
                Article
                10.1002/adma.201302544
                23996782
                © 2013
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