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Magnetic fields can remodel a brand new gentle polymer materials, known as magnetic form reminiscence polymer, into a wide range of shapes.
The fabric might allow a variety of latest purposes from antennas that change frequencies on the fly to gripper arms for delicate or heavy objects.
The fabric is a mix of three completely different elements, all with distinctive traits: two sorts of magnetic particles, one for inductive warmth and one with sturdy magnetic attraction, and shape-memory polymers to assist lock numerous form adjustments into place.
An assortment of objects comprised of magnetic form reminiscence polymers. (Credit score: Shuai Wu/Ohio State U.)
“That is the primary materials that mixes the strengths of all of those particular person elements right into a single system able to fast and reprogrammable form adjustments which can be lockable and reversible,” says Jerry Qi, a professor within the George W. Woodruff College of Mechanical Engineering on the Georgia Institute of Expertise.
To make the fabric, the researchers started by distributing particles of neodymium iron boron (NdFeB) and iron oxide into a mix of form reminiscence polymers. As soon as the particles have been absolutely integrated, the researchers then molded that combination into numerous objects designed to judge how the fabric carried out in a collection of purposes.
For instance, the staff made a gripper claw from a t-shaped mould of the magnetic form reminiscence polymer combination. Making use of a high-frequency, oscillating magnetic area to the thing brought about the iron oxide particles to warmth up by means of induction and heat your entire gripper. That temperature rise, in flip, brought about the form reminiscence polymer matrix to melt and develop into pliable. Researchers then utilized a second magnetic area to the gripper, inflicting its claws to open and shut. As soon as the form reminiscence polymers cool again down, they continue to be locked in that place.
“…as soon as an object has reached its new form, it may be locked there with out continually consuming vitality.”
The form-changing course of takes only some seconds from begin to end, and the power of the fabric at its locked state allowed the gripper to carry objects as much as 1,000 occasions its personal weight.
“We envision this materials being helpful for conditions the place a robotic arm would want to carry a really delicate object with out damaging it, corresponding to within the meals business or for chemical or biomedical purposes,” Qi says.
The brand new materials builds on earlier analysis that outlined actuation mechanisms for gentle robotics and lively supplies and evaluated the restrictions in present applied sciences.
“The diploma of freedom is proscribed in typical robotics” says Ruike (Renee) Zhao, an assistant professor within the mechanical and aerospace engineering division at The Ohio State College. “With gentle supplies, that diploma of freedom is limitless.”
The researchers additionally examined different purposes, the place coil-shaped objects comprised of the brand new materials expanded and retracted—simulating how an antenna might probably change frequencies when magnetic fields actuate it.
“This course of requires us to make use of magnetic fields solely in the course of the actuation part,” Zhao says. “So, as soon as an object has reached its new form, it may be locked there with out continually consuming vitality.”
The analysis seems within the journal Superior Supplies
Help for this analysis got here from The Ohio State College Supplies Analysis Seed Grant Program, funded by the Nationwide Science Basis’s Heart for Emergent Supplies; the Heart for Exploration of Novel Complicated Supplies; the Institute for Supplies Analysis; the Air Power Workplace of Scientific Analysis; the US Division of Power; and the Haythornthwaite Basis.
The content material is the duty of the authors and doesn’t essentially characterize the official views of the sponsoring companies.
Supply: Georgia Institute of Expertise
Unique Examine DOI: 10.1002/adma.201906657