MDS uses Archimedes principle for fluids (buoyancy force on an object is the same as the weight of fluid displaced by the object) to separate different particles in a mixture. Like traditional sink-float methods where a mixture of plastics is separated into floating (light) and sinking (heavy) materials. Magnetic density separation (MDS) is a separation technique considered by many to be a game-changer in the plastic recycling industry, as it can continuously separate different plastic types from a flow of waste materials. The major challenge in the plastic recycling industry is the efficient separation of plastic waste by type and color, which would also help minimize the chances of high-grade recyclable plastics being mistakenly categorized as lower-grade plastics that cannot be recycled. One way to change this trend is through the development of more efficient plastic recycling and separation technologies. If the current plastic production and recycling trend continues, by 2050 roughly 12 billion metric tons of plastic waste will have accumulated as waste on our planet. The production, accumulation, and incineration of plastics directly contribute to climate change, ocean pollution, and infiltration in our food supply. The technology is still unable to stop bullets but maybe sometime in the near future you'll get to see a liquid version of the Iron Man suit.Plastic pollution is a global problem. While this experiment with MR fluid is informative and fun, the simple mixture won’t make you a real-life Iron Man. Your MR mud will solidify under the influence of a magnetic field. A similar phenomenon can be observed between iron filings and a magnet without the oil. It will thicken and form linear patterns in response to the magnetic field. Now, the cool part is when you move the magnet near your MR mud. Your DIY MR fluid should have a consistency reminiscent of greasy mud. You should be able to mix it around although it’s thicker than water. You can experiment with your own MR fluid with this DIY tutorial: SuppliesĪll you have to do is mix the iron filings with the vegetable oil. MR fluid is already used in various practical ways today such as for damping and dissipative devices. When a magnetic field is applied, the iron particles align along the magnetic flux lines as shown below in this image also by Will Becker : This image by Will Becker demonstrates the MR fluid when not within a magnetic field: The magnetic particles make the liquid dense but retain a fluid viscosity. The carrier oil contains magnetic particles usually consisting of iron. MR fluid would make effective body armor because it’s flexible and the hardening process is extremely fast. MR fluid differs from ferrofluid, which contains ferromagnetic particles with a surfactant to inhibit clumping because it thickens when magnetized. MR fluid is a smart liquid capable of solidifying when passing through a magnetic field. This liquid body armor is possible because it contains magnetorheological (MR) fluids. Or is it? Scientists are working on an impenetrable suit of body armor consisting of iron particles and a carrier liquid. The Iron Man suit, a work of science fiction, seems to be a feat of futuristic engineering not yet possible today. The popular Iron Man movie franchise and comic features a suit of body armor that could make any engineer green with envy.
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