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</nav> </header> <section id="slider-banner"> </section> <div id="content" class="site-content"> <div class="ak-container"> <div id="primary" class="content-area"> <main id="main" class="site-main" role="main"> <article id="post-3600" class="post-3600 post type-post status-publish format-standard has-post-thumbnail hentry category-electronics-semiconductors tag-electric-energy tag-microrobot"> <header class="entry-header"> <h1 class="entry-title">A flexible microrobot that can survive almost any deformation</h1> <div class="entry-meta"> <span class="posted-on">Posted on <a href="https://europenanoscience.org/a-flexible-microrobot-that-can-survive-almost-any-deformation/" rel="bookmark"><time class="entry-date published" datetime="2020-04-07T09:04:14+00:00">April 7, 2020</time><time class="updated" datetime="2020-04-07T10:10:38+00:00">April 7, 2020</time></a></span><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://europenanoscience.org/author/nano-admin/">nano-admin</a></span></span> </div> </header> <div class="entry-content"> <p style="text-align: justify;"> <p style="text-align: justify;"><img class="wp-image-3602 aligncenter" src="http://europenanoscience.org/wp-content/uploads/2020/04/aflexiblemic-1024x576.jpg" alt="" width="558" height="314" srcset="https://europenanoscience.org/wp-content/uploads/2020/04/aflexiblemic-1024x576.jpg 1024w, https://europenanoscience.org/wp-content/uploads/2020/04/aflexiblemic-300x169.jpg 300w, https://europenanoscience.org/wp-content/uploads/2020/04/aflexiblemic-768x432.jpg 768w, https://europenanoscience.org/wp-content/uploads/2020/04/aflexiblemic.jpg 1600w" sizes="(max-width: 558px) 100vw, 558px" /></p> <h5 style="text-align: center;"><span style="color: #808080;">The smallest self-propelled electronic microrobots developed by the researchers maneuver in liquid on top of a 1 cent euro coin. Credit: TU Chemnitz.</span></h5> <p style="text-align: justify;">An International research team led by Dr. Oliver Schmidt, working at Chemnitz University of Technology (TU Chemnitz) and Leibniz IFW Dresden has recently developed a microrobitic system with a wide range of possible applications, ranging from completing micro-surgeries to delivering goods to humans. This robot, presented in a paper聽<a href="https://www.nature.com/articles/s41928-020-0384-1">published in聽<i>Nature Electronics</i></a>, builds on an idea聽introduced by the same team of researchers聽almost a decade ago.</p> <p style="text-align: justify;">“We first started exploring the idea of creating a tiny microrobotic system that is self-propelled by a powerful jet engine and has microelectronic components on board almost ten years ago,” Schmidt told TechXplore. “Our initial idea was to build a smart self-propelling microsystem that can interact with single biological cells, which are of similar size to microsystem itself. This system should be able to move around, sense its environment, transport cargo, deliver drugs and carry out micro-surgeries.”</p> <p style="text-align: justify;">Since Schmidt and his colleagues first introduced their concept for a microrobotic system, their team and several others worldwide have tried to create similar technologies, primarily in vitro (i.e., using petri dishes). Implementing such as system inside the聽human body, however, has proved to be far more challenging. In fact, in order to complete tasks inside the body, the system would need to be controlled from outside and the information it collects (e.g. diagnostic data) should be easily conveyed to the outer world (e.g. to doctors or healthcare professionals).</p> <p style="text-align: justify;">“For a microrobotic system to work in the human body, it should contain聽electric energy, sensors, actuators, antennas and microelectronic circuitry,” Schmidt explained. “The main objective of our recent work was to make one large step towards this final (and admittedly very ambitious) final goal; still in a simplified way, of course.”</p> <p style="text-align: justify;">Schmidt and his colleagues fabricated their flexible microsystem by integrating micro and nano electronic components on a chip surface, in a similar way to how silicon technology is used to build computer chips. A key difference between their system and regular computer chips, however, is that the former’s design includes聽jet engines聽created using an approach pioneered approximately twenty years ago, which is not typically used in the development of mainstream microelectronics.</p> <p style="text-align: justify;">“The trick consists in putting highly strained thin materials onto the chip, which snap back (roll-up) into Swiss roll microtube structures, when they are delaminated from the chip surface,” Schmidt said. “This procedure can be controlled well, so that the rolled-up microtubes are firmly connected at two opposite sides to the microrobotic system. If these microtubes are coated with platinum inside, oxygen bubbles are generated by a catalytic reaction, once the platinum gets in touch with aqueous solution containing a little bit of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>).”</p> <p style="text-align: justify;"><img class="aligncenter wp-image-3601 size-large" src="http://europenanoscience.org/wp-content/uploads/2020/04/1-aflexiblemic-1024x576.jpg" alt="" width="750" height="422" srcset="https://europenanoscience.org/wp-content/uploads/2020/04/1-aflexiblemic-1024x576.jpg 1024w, https://europenanoscience.org/wp-content/uploads/2020/04/1-aflexiblemic-300x169.jpg 300w, https://europenanoscience.org/wp-content/uploads/2020/04/1-aflexiblemic-768x432.jpg 768w, https://europenanoscience.org/wp-content/uploads/2020/04/1-aflexiblemic.jpg 1600w" sizes="(max-width: 750px) 100vw, 750px" /></p> <h6 style="text-align: center;"><span style="color: #808080;">Dr. Oliver G. Schmidt while conducting his research. Credit: Jacob M眉ller.</span></h6> <p style="text-align: justify;">As a result of the non-conventional design strategy used by Schmidt and his colleagues, when the microrobotic system is placed into an聽aqueous solution聽containing hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) the solution enters its two microtubes, generating oxygen bubbles. These bubbles are then thrusted outside of the microtubes’ ends, accelerating the system by a mechanism known as jet propulsion.</p> <p>“This jet propulsion principle was pioneered by our group 12 years ago,” Schmidt said. However, a twin-jet engine like in our present work was never constructed before.”</p> <p style="text-align: justify;">The catalytic reaction at the core the researchers’聽jet propulsion聽strategy can be controlled by changing the temperature of the jet engines. A high temperature results in more bubbles and a stronger thrust; a low temperature in fewer bubbles and a weaker thrust.</p> <p style="text-align: justify;">Schmidt and his colleagues control the temperature of one of the two jet engines by applying a current that passes through a resistive element, which is connected to the engine. Changes in temperature increase the amount of bubbles generated and the subsequent thrust in one of the jet engines, which in turn allows the system to make right or left turns.</p> <p style="text-align: justify;">“You may ask yourself how we supplied the current that heats the resistive element,” Schmidt said. “For this purpose, we integrated a tiny antenna into the microsystem which can be fed by wireless energy from the outside (similar to wireless inductive charging of your mobile phone). So electrical energy is on board and can be used, which is entirely new for such a tiny self-propelled microbot.”</p> <p style="text-align: justify;">The tiny robot developed by Schmidt and his colleagues also has a little arm, which allows it to grab and release small objects in its surroundings. When the system’s temperature changes, the little arm performs different actions, bending up to grab objects (e.g., micro-pills) or bending down to release them.</p> <p><iframe width="750" height="422" src="https://www.youtube.com/embed/G2mA0i_xEmU?feature=oembed&enablejsapi=1&origin=http://europenanoscience.org" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></p> <p> </p> <figure class="mb-4"> <div class="embed-responsive embed-responsive-16by9" style="text-align: justify;"> <p>“This integrated robotic arm is also an entirely new feature for self-propelled microsystems,” Schmidt said. “Finally, the microrobot can have a tiny infrared LED on board, which can be switched on by the wirelessly transferred energy. This LED could be useful to track the microrobot inside the body. Switching on and off tiny LEDS on a motile microrobot has never been shown before.”The tiny robotic system developed by Schmidt and his team is made of a highly flexible material. This means that it can be bent or deformed without breaking, thus it could even pass through tiny capillaries or other small channels in the human body and continue to operate normally.</p> <p>In the future, this new system could have a number of valuable applications. For instance, it could complete tasks inside the human body that require a high level of precision, including surgical or diagnostic procedures.</p> <p>“We have demonstrated that electrical energy can be wirelessly transferred to ultra-small microrobotic systems and that this energy can be used to carry out useful tasks: Steering the microrobot remotely or switching on and off an infrared LED,” Schmidt said. “The next step will be to run the system in biological fluids such as blood. For this purpose, the engines need to be constructed in a slightly different way.”</p> <p> </p> </div> </figure> <p><strong>More information:</strong></p> <p>A flexible microsystem capable of controlled motion and actuation by wireless power transfer.<br /> <a href="http://dx.doi.org/10.1038/s41928-020-0384-1" target="_blank" rel="noopener noreferrer" data-doi="1">DOI: 10.1038/s41928-020-0384-1</a>. https://www.nature.com/articles/s41928-020-0384-1</p> <p>Rolled-up nanotech on polymers: from basic perception to self-propelled catalytic microengines.聽<a href="http://dx.doi.org/10.1039/C0CS00078G" target="_blank" rel="noopener noreferrer" data-doi="1">DOI: 10.1039/C0CS00078G</a>. https://pubs.rsc.org/en/Content/ArticleLanding/2011/CS/C0CS00078G#!divAbstract</p> <div class="mt-3"><strong>Journal information:</strong>聽<a href="https://techxplore.com/journals/nature-electronics/"><cite>Nature Electronics</cite></a></div> <div class="mt-3"></div> <h5 class="mt-3">Source: www.techxplore.com</h5> <p></p> </div> <footer class="entry-footer"> </footer> </article> <div id="comments" class="comments-area"> <div id="respond" class="comment-respond"> <h3 id="reply-title" class="comment-reply-title">Leave a Reply <small><a rel="nofollow" id="cancel-comment-reply-link" href="/a-flexible-microrobot-that-can-survive-almost-any-deformation/#respond" style="display:none;">Cancel reply</a></small></h3> <form action="https://europenanoscience.org/wp-comments-post.php" method="post" id="commentform" class="comment-form"> <p class="comment-notes"><span id="email-notes">Your email address will not be published.</span> Required fields are marked <span class="required">*</span></p><p class="comment-form-comment"><label for="comment">Comment</label> <textarea id="comment" name="comment" cols="45" rows="8" maxlength="65525" aria-required="true" required="required"></textarea></p><p class="comment-form-author"><label for="author">Name <span class="required">*</span></label> 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