September 19, 2022
Overview of trans-scale maneuver and scale reconfiguration strategies of the scale-reconfigurable miniature ferrofluidic robots (SMFRs). (A) Trans-scale control of the SMFR: locomotion of the centi-FR, milli-FR, and micro-FR based on magnetic gradient, both magnetic gradient and torque, and magnetic torque only, respectively. (B) Response behaviors of ferrofluid droplets in magnetic fields. (C) The SMFR is manipulated by a custom-designed magnetic actuation system (the M3RA system) composed of four electromagnets, a spherical permanent magnet (SPM), and a motorized translation stage. To easily observe the internal composition of the system, we hide a quarter of the structure. (D) Deformation and scale reconfiguration of the SMFR: stretch deformation, scale-down through separation, and scale-up through recombination. The red arrow represents the polarization direction of the magnetic field. (E) Typical application scenario of the SMFR based on the combination of the above capacities: locomotion in a sharply variable space such as the vascular network. Credit: Science Advances (2022). DOI: 10.1126/sciadv.abq1677
A team of researchers at Soochow University, working with two colleagues from the Max Planck Institute for Intelligent Systems and another from Harbin Institute of Technology, has developed a type of soft robot that can be split into tiny components to pass through small spaces and then reassemble. In their paper published in the journal Science Advancesthe group describes how they made their tiny robots and suggest possible uses for them.
As the science of robotics continues to mature, engineers around the world continue to find new ways to make them. In this new effort, the researchers made theirs out of a ferrofluid (magnetic iron oxide nanoparticles) that they suspended in a clear oil. the robot is controlled using external magnets.
Using a robot made of a material that is only very loosely held together, the researchers note, allows the alteration of its shape on demand. By applying multiple magnetic fields, they showed that it was possible to direct their robot through a maze, at times changing its shape to overcome obstacles. They forced it to elongate, for example, to squeeze through a narrow passageway. They also broke it into a desired number of smaller parts to pass through a porous material. In both cases, the robot was then easily reassembled into a single round robot shape and continued on with its journey. They note that such a robot could be made in a wide variety of sizes.
The robot could conceivably be used in medical applications as a means for carrying drugs to difficult-to-access body parts, such as lung nodes or parts of the brain. The researchers acknowledge that for practical applications, the design would have to overcome many obstacles, most obviously, the development of a magnetic control system that can accurately penetrate bone such as the skull. In the meantime, others have noted that such a robotic system could prove to be useful in lab-on-a-chip devices where chemical processes are conducted for tasks such as virus detection. The tiny new robots could perhaps be used to carry the chemicals needed for the reactions.
Xinjian Fan et al, Scale-reconfigurable miniature ferrofluidic robots for negotiating sharply variable spaces, Science Advances (2022). DOI: 10.1126/sciadv.abq1677
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