Researchers Draw 4D Objects with Pens
AnonymousMemberApril 5, 2021 at 10:20 AM
One of the beauties of 3D printing pens, like the 3Doodler, is that they lower the barrier to entry of 3D printing even further. Many desktop printers are pretty simple to use, but 3D printing pens are just about as easy as drawing with a standard utensil. Scientists at Seoul National University have taken this advantage a step further by demonstrating the use of traditional pens to create 4D printed objects.
As described in an article for Science Advances, researchers See Woo Song et al. use a method to transform 2D drawings made with an ink pen into 3D geometries. Once a figure was drawn, an ink made from polyvinyl butyral (PVB) could be applied to parts of the print they wanted to lift off of the substrate in response to water, a process referred to as surface tension–assisted transformation (STAT). To further control the process, the team developed an ink that could keep portions anchored when submerged in water. By swapping water for a monomer solution including potassium persulfate (KPS), the areas coated with PVB polymerize and are fixed in place even after removed from the solution, referred to as surface catalytically initiated radical polymerization (SCIRP).
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