Novel magnetic spray transforms objects into millirobots for biomedical applications

novel magnetic spray transforms objects into millirobots for biomedical applications

Sumary of Novel magnetic spray transforms objects into millirobots for biomedical applications:

  • An easy way to make millirobots by coating objects with a glue-like magnetic spray was developed in a joint research led by a scientist from City University of Hong Kong (CityU)..
  • As the magnetic coating is biocompatible and can be disintegrated into powders when needed, this technology demonstrates the potential for biomedical applications, including catheter navigation and drug delivery..
  • The research findings have been published in the scientific journal Science Robotics, titled “An agglutinate magnetic spray transforms inanimate objects into millirobots for biomedical applications.”.
  • Dr Shen’s research team came up with a simple approach to construct millirobots by coating objects with a composited glue-like magnetic spray, called M-spray..
  • “Our idea is that by putting on this ‘magnetic coat’, we can turn any objects into a robot and control their locomotion..
  • The M-spray we developed can stick on the targeted object and ‘activate’ the object when driven by a magnetic field,”.
  • Composed of polyvinyl alcohol (PVA), gluten and iron particles, M-spray can adhere to the rough and smooth surfaces of one (1D), two (2D) or three-dimensional (3D) objects instantly, stably and firmly..
  • The film it formed on the surface is just about 0.1 to 0.25mm thick, which is thin enough to preserve the original size, form and structure of the objects..
  • After coating the object with M-spray, the researchers magnetised it with single or multiple magnetisation directions, which could control how the object moved by a magnetic field..
  • In this way, when driven by a magnetic field, the objects can be transformed into millirobots with different locomotion modes, such as crawling, flipping, walking, and rolling, on various surfaces from glass, skin, wood to sand..
  • However, by wetting the solidified M-spray coating fully to make it adhesive like glue and then by applying a strong magnetic field, the distribution and alignment direction of the magnetic particles (easy magnetisation axis) of the M-spray coating can be changed..
  • And the impact of blood/liquid flow on the motion ability and stability on the M-spray coated catheter was limited..
  • By reprograming the M-spray coating of different sections of a cotton thread based on the delivery task and environment, they further showed that it could achieve a fast-steering and smoothly pass through an irregular, narrow structure….

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